Application guidelines -...

Danfoss scroll compressors PSH019 to PSH039

50 - 60 Hz - R410A

Application guidelines

http://cc.danfoss.com

Content

Scroll compressor principle ............................. 4

Nomenclature and specifications .................... 5Compressor model designation ...................................... 5Nomenclature ........................................................................ 5Technical specification ....................................................... 5

Performance data - 50 Hz ................................. 6

Performance data - 60 Hz ................................. 7

Dimensions ....................................................... 8PSH019 ..................................................................................... 8PSH023-026-030-034 .......................................................... 9PSH039 ...................................................................................10

Electrical data, connections and wiring .......11Connection Details ............................................................11Suction and discharge connections ............................11Oil sight glass .......................................................................11Oil equalisation connection............................................11Schrader .................................................................................11Liquid injection valve ........................................................11Motor voltage ......................................................................12Voltage imbalance .............................................................12Electrical data .......................................................................12LRA (Locked Rotor Amp) ..................................................13MCC (Maximum Continuous Current) .........................13Max. operating Current ....................................................13Winding resistance.............................................................13General wiring information ............................................13Wiring Connections ...........................................................14IP Rating .................................................................................14Terminal box temperature ..............................................15Terminal box knock-out dimensions ...........................15Compressor protection ....................................................15

Approvals and certificates .............................16Approvals and certificates ...............................................16Pressure Equipment ..........................................................16Low voltage directive ........................................................16Machines directive .............................................................16Internal free volume ..........................................................16

Operating conditions .....................................17Refrigerant and lubricants...............................................17Motor supply ........................................................................17Compressor ambient temperature ..............................17Application envelope ........................................................18Discharge temperature protection ..............................18High and low pressure protection................................18Liquid Injection ...................................................................19Cycle rate limit .....................................................................20

System design recommendations .................21General ...................................................................................21Essential piping design considerations ......................21Off-cycle migration ............................................................22Liquid flood back ................................................................24

Specific application recommendations ........25Low ambient application .................................................25Low load operation ............................................................26Brazed plate heat exchangers ........................................26Electronic expansion valve .............................................26Reversible heat pump systems ......................................26Water utilizing systems .....................................................27

Sound and vibration management ...............28Starting sound level...........................................................28Running sound level .........................................................28Stopping sound level ........................................................28

Installation ......................................................29Compressor handling and storage...............................29Compressor mounting .....................................................29Parallel Installation .............................................................29Tandem Kits ..........................................................................30Tandem Configuration......................................................31Compressor holding charge ...........................................31System cleanliness .............................................................31Tubing .....................................................................................32Brazing and soldering .......................................................32System pressure test .........................................................33Leak detection .....................................................................33Vacuum evacuation and moisture removal ..............34Filter driers ...........................................................................34Refrigerant charging .........................................................34Refrigerant charge limit ...................................................35Insulation resistance and dielectric strength ...........35Commissioning ...................................................................35Oil level checking and top-up ........................................35

Ordering information and packaging ...........36Packaging ..............................................................................36Ordering information ........................................................37

Accessories ......................................................38

3FRCC.PC.022.A6.02

Application Guidelines

Scroll compressor principle

In a Danfoss heat pump scroll compressor, the compression is performed by two scroll elements located in the upper part of the compressor. Suction gas enters the compressor at the suction connection. As all of the gas flows around and through the electrical motor, thus ensuring complete motor cooling in all applications, oil droplets separate and fall into the oil sump. After exiting the electrical motor, the gas enters the scroll elements where compression takes place. Ultimately, the discharge gas leaves the compressor at the discharge connection.

The figure below illustrates the entire compression process. The centre of the orbiting scroll (in grey) traces a circular path around

the centre of the fixed scroll (in black). This movement creates symmetrical compression pockets between the two scroll elements. Low-pressure suction gas is trapped within each crescent-shaped pocket as it gets formed; continuous motion of the orbiting scroll serves to seal the pocket, which decreases in volume as the pocket moves towards the centre of the scroll set increasing the gas pressure. Maximum compression is achieved once a pocket reaches the centre where the discharge port is located; this stage occurs after three complete orbits. Compression is a continuous process: the scroll movement is suction, compression and discharge all at the same time.

4 FRCC.PC.022.A6.02


Nomenclature and specifications

Compressor model designation

Nomenclature

Technical specification

Danfoss PSH scroll compressors for R410A are available as single and manifolding compressors. The example below presents the compressor nomenclature which equals to the technical

reference as shown on the compressor nameplate. Code numbers for ordering are listed in section “Ordering information and packaging”.

Model

Nominal Heating capacity

Power Input COP Swept volume

Displacement Oil charge Net weight

W kW W/W cm3/rev m3/h dm3 kg

50Hz

PSH019 19 600 6.62 2.96 88.40 15.40 3.0 58.5PSH023 23 000 7.47 3.07 103.50 18.00 3.3 64.5PSH026 26 000 8.65 3.00 116.90 20.30 3.3 64.5PSH030 30 000 9.60 3.13 133.00 23.12 3.3 67.5PSH034 34 200 10.95 3.12 151.17 26.40 3.3 69.5PSH039 38 900 12.19 3.19 170.30 29.60 3.6 72.0

60Hz

PSH019 23 600 7.97 2.96 88.40 18.60 3.0 58.5PSH023 28 000 8.84 3.17 103.50 21.80 3.3 64.5PSH026 31 400 10.19 3.08 116.90 24.60 3.3 64.5PSH030 35 700 11.35 3.15 133.00 27.90 3.3 67.5PSH034 40 500 12.72 3.18 151.17 31.90 3.3 69.5PSH039 46 500 14.49 3.21 170.30 35.80 3.6 72.0

Evaporating temperature: -7°C Condensing temperature:50°C Superheat: 5K Subcooling:4KRefrigerant: R410ADisplacement at nominal speed: 2900rpm at 50Hz. 3500rpm at 60HzNet weight with oil charge

CLC4A039S HP

Heat pump application

Scroll (commercial / large commercial)

LubricantR410A, POE

Heating capacityin kW at 50Hz

-7°C/50°C/SH5K/SC4K

UL index

Evolution index

Motor protection typeL: Internal overload protector

ConnectionsA: bare compressorC: full package (including injection valve)

Motor voltage code3: 200-230V/3~/60Hz4: 380-400V/3~/50Hz - 460V/3~/60Hz9: 380V/3~/60Hz - 342-418V/3~/60Hz

5FRCC.PC.022.A6.02


Performance data - 50 Hz

Cooling

Heating

Te -30 -20 -15 -10 -5 0 5 10 15

Tc Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

PSH019-4

20 7 040 3.48 11 140 3.59 13 810 3.66 16 930 3.75 20 570 3.87 24 740 4.03 29 510 4.23 - - - -30 6 170 4.26 10 070 4.36 12 560 4.41 15 470 4.48 18 840 4.57 22 710 4.68 27 130 4.83 32 130 5.02 37 760 5.2740 5 230 5.25 8 820 5.36 11 100 5.40 13 750 5.44 16 810 5.50 20 330 5.58 24 340 5.68 28 900 5.81 34 040 5.9950 4 230 6.52 7 430 6.65 9 430 6.68 11 770 6.72 14 470 6.75 17 590 6.79 21 160 6.86 25 220 6.94 29 820 7.0660 - - 5 890 8.31 7 580 8.35 9 550 8.37 11 840 8.39 14 510 8.41 17 580 8.44 21 100 8.48 25 110 8.5568 - - - - - - 7 600 10.03 9 530 10.04 11 800 10.04 14 440 10.04 17 490 10.06 20 990 10.09

PSH023-4

20 8 570 4.08 13 310 4.38 16 360 4.52 19 940 4.61 24 100 4.64 28 880 4.58 34 340 4.42 - - - -30 7 470 4.91 11 980 5.13 14 860 5.29 18 220 5.44 22 100 5.57 26 560 5.66 31 650 5.67 37 420 5.60 43 920 5.4140 6 310 6.15 10 500 6.14 13 140 6.25 16 220 6.39 19 780 6.55 23 870 6.70 28 540 6.83 33 840 6.90 39 830 6.9050 5 080 8.01 8 830 7.63 11 190 7.61 13 940 7.67 17 120 7.78 20 780 7.93 24 990 8.09 29 770 8.24 35 200 8.3660 - - 6 990 9.82 9 010 9.60 11 370 9.50 14 120 9.50 17 310 9.57 20 980 9.69 25 200 9.84 30 010 10.0068 - - - - - - 9 100 11.50 11 460 11.35 14 230 11.31 17 450 11.35 21 180 11.45 25 450 11.59

PSH026-4

20 9 490 4.47 15 160 4.64 18 860 4.76 23 220 4.93 28 290 5.14 34 130 5.41 40 800 5.74 - - - -30 8 350 5.49 13 720 5.61 17 160 5.69 21 200 5.81 25 880 5.97 31 260 6.17 37 410 6.44 44 370 6.77 52 210 7.1840 7 140 6.82 12 060 6.90 15 190 6.95 18 840 7.02 23 070 7.13 27 930 7.28 33 490 7.47 39 800 7.73 46 910 8.0550 5 840 8.55 10 210 8.60 12 950 8.63 16 160 8.67 19 870 8.73 24 150 8.82 29 050 8.95 34 640 9.14 40 980 9.3860 - - 8 150 10.82 10 450 10.82 13 140 10.83 16 270 10.85 19 910 10.90 24 100 10.97 28 910 11.09 34 390 11.2668 - - - - - - 10 490 13.01 13 120 13.00 16 190 13.01 19 770 13.05 23 910 13.12 28 670 13.23

PSH030-4

20 11 280 5.02 17 620 5.23 21 730 5.34 26 560 5.49 32 160 5.67 38 600 5.90 45 950 6.19 - - - -30 9 960 6.05 15 940 6.28 19 760 6.38 24 220 6.50 29 380 6.64 35 320 6.81 42 080 7.03 49 750 7.32 58 370 7.6940 8 580 7.35 14 070 7.63 17 530 7.74 21 570 7.85 26 240 7.96 31 600 8.10 37 720 8.27 44 670 8.49 52 500 8.7750 7 130 8.98 12 000 9.36 15 050 9.50 18 590 9.61 22 690 9.72 27 420 9.84 32 840 9.98 39 000 10.15 45 990 10.3760 - - 9 710 11.56 12 280 11.74 15 270 11.88 18 740 12.00 22 770 12.12 27 420 12.24 32 740 12.38 38 810 12.5668 - - - - - - 12 350 14.11 15 280 14.26 18 710 14.39 22 690 14.51 27 290 14.64 32 580 14.80

PSH034-4

20 12 690 5.57 20 070 5.82 24 860 5.97 30 460 6.14 36 960 6.33 44 430 6.52 52 940 6.72 - - - -30 11 140 6.83 18 060 6.99 22 470 7.12 27 620 7.28 33 580 7.45 40 410 7.65 48 200 7.86 57 020 8.08 66 940 8.3040 9 560 8.55 15 910 8.59 19 900 8.67 24 530 8.78 29 880 8.93 36 020 9.10 43 030 9.30 50 970 9.52 59 930 9.7650 7 930 10.91 13 580 10.77 17 080 10.78 21 140 10.83 25 830 10.92 31 220 11.05 37 380 11.22 44 400 11.42 52 330 11.6460 - - 11 030 13.70 14 000 13.61 17 430 13.58 21 390 13.60 25 970 13.66 31 230 13.77 37 250 13.92 44 110 14.1168 - - - - - - 14 190 16.39 17 540 16.34 21 420 16.33 25 920 16.38 31 110 16.48 37 060 16.62

PSH039-4

20 14 480 6.13 22 290 6.48 27 420 6.70 33 450 6.95 40 450 7.26 48 500 7.63 57 660 8.07 - - - -30 12 950 7.46 20 350 7.81 25 110 8.01 30 690 8.24 37 140 8.51 44 530 8.83 52 930 9.21 62 420 9.66 73 050 10.2040 11 290 9.13 18 110 9.48 22 440 9.67 27 480 9.87 33 300 10.10 39 960 10.38 47 530 10.70 56 090 11.08 65 690 11.5450 9 450 11.31 15 540 11.69 19 350 11.86 23 780 12.04 28 880 12.24 34 730 12.47 41 400 12.73 48 940 13.05 57 440 13.4360 - - 12 560 14.60 15 790 14.77 19 520 14.93 23 830 15.10 28 790 15.28 34 470 15.50 40 920 15.75 48 230 16.0568 - - - - - - 15 680 17.89 19 300 18.03 23 490 18.19 28 320 18.36 33 850 18.56 40 150 18.80

Te -30 -20 -15 -10 -5 0 5 10 15

Tc Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

PSH019-4

20 10 370 3.48 14 580 3.59 17 310 3.66 20 520 3.75 24 270 3.87 28 600 4.03 33 560 4.23 - - - -30 10 240 4.26 14 240 4.36 16 790 4.41 19 760 4.48 23 210 4.57 27 190 4.68 31 750 4.83 36 940 5.02 42 800 5.2740 10 250 5.25 13 950 5.36 16 270 5.40 18 960 5.44 22 070 5.50 25 660 5.58 29 780 5.68 34 470 5.81 39 780 5.9950 10 470 6.52 13 790 6.65 15 830 6.68 18 200 6.72 20 930 6.75 24 090 6.79 27 720 6.86 31 870 6.94 36 580 7.0660 - - 13 840 8.31 15 570 8.35 17 560 8.37 19 880 8.39 22 560 8.41 25 650 8.44 29 220 8.48 33 290 8.5568 - - - - - - 17 200 10.03 19 140 10.04 21 410 10.04 24 050 10.04 27 120 10.06 30 650 10.09

PSH023-4

20 12 500 4.08 17 520 4.38 20 710 4.52 24 380 4.61 28 570 4.64 33 300 4.58 38 590 4.42 - - - -30 12 200 4.91 16 920 5.13 19 950 5.29 23 450 5.44 27 460 5.57 32 010 5.66 37 120 5.67 42 810 5.60 49 130 5.4140 12 230 6.15 16 410 6.14 19 150 6.25 22 370 6.39 26 080 6.55 30 320 6.70 35 110 6.83 40 490 6.90 46 470 6.9050 12 790 8.01 16 180 7.63 18 520 7.61 21 320 7.67 24 610 7.78 28 420 7.93 32 780 8.09 37 710 8.24 43 250 8.3660 - - 16 440 9.82 18 250 9.60 20 510 9.50 23 260 9.50 26 520 9.57 30 310 9.69 34 680 9.84 39 640 10.0068 - - - - - - 20 170 11.50 22 390 11.35 25 120 11.31 28 380 11.35 32 210 11.45 36 620 11.59

PSH026-4

20 13 880 4.47 19 720 4.64 23 540 4.76 28 060 4.93 33 340 5.14 39 450 5.41 46 450 5.74 - - - -30 13 750 5.49 19 230 5.61 22 760 5.69 26 910 5.81 31 740 5.97 37 330 6.17 43 730 6.44 51 020 6.77 59 260 7.1840 13 840 6.82 18 840 6.90 22 020 6.95 25 750 7.02 30 080 7.13 35 080 7.28 40 830 7.47 47 390 7.73 54 830 8.0550 14 250 8.55 18 660 8.60 21 430 8.63 24 670 8.67 28 440 8.73 32 810 8.82 37 850 8.95 43 620 9.14 50 190 9.3860 - - 18 780 10.82 21 090 10.82 23 790 10.83 26 940 10.85 30 620 10.90 34 880 10.97 39 810 11.09 45 460 11.2668 - - - - - - 23 280 13.01 25 900 13.00 28 980 13.01 32 590 13.05 36 800 13.12 41 670 13.23

PSH030-4

20 16 270 5.02 22 820 5.23 27 050 5.34 32 010 5.49 37 790 5.67 44 460 5.90 52 110 6.19 - - - -30 15 980 6.05 22 190 6.28 26 110 6.38 30 680 6.50 35 980 6.64 42 090 6.81 49 080 7.03 57 030 7.32 66 020 7.6940 15 890 7.35 21 660 7.63 25 230 7.74 29 370 7.85 34 150 7.96 39 650 8.10 45 940 8.27 53 110 8.49 61 230 8.7750 16 060 8.98 21 310 9.36 24 490 9.50 28 150 9.61 32 360 9.72 37 210 9.84 42 760 9.98 49 100 10.15 56 300 10.3760 - - 21 200 11.56 23 950 11.74 27 080 11.88 30 680 12.00 34 830 12.12 39 600 12.24 45 060 12.38 51 300 12.5668 - - - - - - 26 380 14.11 29 460 14.26 33 020 14.39 37 120 14.51 41 860 14.64 47 300 14.80

PSH034-4

20 17 960 5.57 25 580 5.82 30 500 5.97 36 270 6.14 42 950 6.33 50 600 6.52 59 300 6.72 - - - -30 17 600 6.83 24 670 6.99 29 210 7.12 34 510 7.28 40 630 7.45 47 650 7.65 55 630 7.86 64 660 8.08 74 790 8.3040 17 660 8.55 24 030 8.59 28 090 8.67 32 840 8.78 38 330 8.93 44 630 9.10 51 830 9.30 59 980 9.52 69 160 9.7650 18 250 10.91 23 760 10.77 27 280 10.78 31 390 10.83 36 160 10.92 41 680 11.05 48 000 11.22 55 200 11.42 63 340 11.6460 - - 23 990 13.70 26 870 13.61 30 270 13.58 34 250 13.60 38 900 13.66 44 260 13.77 50 430 13.92 57 460 14.1168 - - - - - - 29 700 16.39 32 990 16.34 36 880 16.33 41 420 16.38 46 700 16.48 52 780 16.62

PSH039-4

20 20 570 6.13 28 720 6.48 34 060 6.70 40 340 6.95 47 650 7.26 56 060 7.63 65 660 8.07 - - - -30 20 350 7.46 28 090 7.81 33 060 8.01 38 860 8.24 45 570 8.51 53 280 8.83 62 070 9.21 72 000 9.66 83 170 10.2040 20 340 9.13 27 520 9.48 32 030 9.67 37 280 9.87 43 320 10.10 50 250 10.38 58 150 10.70 67 080 11.08 77 140 11.5450 20 670 11.31 27 130 11.69 31 120 11.86 35 720 12.04 41 020 12.24 47 100 12.47 54 030 12.73 61 880 13.05 70 750 13.4360 - - 27 040 14.60 30 440 14.77 34 330 14.93 38 810 15.10 43 950 15.28 49 840 15.50 56 540 15.75 64 150 16.0568 - - - - - - 33 420 17.89 37 190 18.03 41 530 18.19 46 520 18.36 52 250 18.56 58 790 18.80

Refrigerant: R410A Frequency 50 Hz Subcooling: 4K Superheat: 5KSubject to modification without prior notification. For full data details and capacity table, refer to Online Datasheet Generator: www.danfoss.com/odsg

6 FRCC.PC.022.A6.02


Performance data - 60 Hz

Cooling

Heating

Te -30 -20 -15 -10 -5 0 5 10 15

Tc Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

Cooling(W)

Pe(kW)

PSH019-4

20 8 700 4.00 13 620 4.35 16 810 4.49 20 550 4.62 24 900 4.74 29 910 4.85 35 620 4.98 - - - -30 7 720 4.89 12 350 5.29 15 320 5.46 18 780 5.61 22 790 5.74 27 400 5.88 32 650 6.02 38 610 6.17 45 310 6.3440 6 700 5.82 10 950 6.26 13 640 6.44 16 770 6.61 20 390 6.76 24 550 6.91 29 310 7.06 34 700 7.22 40 780 7.3950 5 620 7.00 9 400 7.46 11 760 7.65 14 510 7.83 17 700 7.99 21 360 8.14 25 560 8.30 30 350 8.46 35 760 8.6360 - - 7 670 9.09 9 660 9.29 11 980 9.47 14 680 9.63 17 800 9.78 21 410 9.94 25 530 10.10 30 230 10.2768 - - - - - - 9 750 11.22 12 020 11.38 14 680 11.53 17 770 11.68 21 330 11.83 25 430 11.99

PSH023-4

20 10 290 4.81 16 020 5.02 19 740 5.16 24 110 5.33 29 180 5.54 35 020 5.79 41 670 6.10 - - - -30 9 210 5.80 14 640 6.00 18 110 6.12 22 160 6.27 26 850 6.45 32 230 6.67 38 370 6.92 45 330 7.23 53 160 7.5940 8 080 7.02 13 090 7.23 16 250 7.35 19 930 7.48 24 170 7.64 29 050 7.82 34 620 8.04 40 930 8.31 48 060 8.6250 6 860 8.54 11 340 8.78 14 130 8.90 17 370 9.03 21 120 9.18 25 430 9.34 30 370 9.54 35 990 9.76 42 350 10.0360 - - 9 350 10.72 11 720 10.86 14 470 11.00 17 660 11.14 21 350 11.30 25 600 11.48 30 460 11.68 36 000 11.9168 - - - - - - 11 880 12.92 14 580 13.07 17 730 13.23 21 390 13.40 25 600 13.59 30 450 13.81

PSH026-4

20 11 670 5.40 18 260 5.67 22 560 5.83 27 620 6.03 33 510 6.27 40 300 6.57 48 050 6.94 - - - -30 10 400 6.52 16 610 6.75 20 610 6.88 25 290 7.04 30 730 7.23 36 980 7.47 44 120 7.76 52 210 8.13 61 330 8.5740 9 050 7.95 14 750 8.17 18 370 8.28 22 610 8.40 27 510 8.55 33 160 8.73 39 620 8.95 46 960 9.24 55 240 9.5950 7 600 9.80 12 650 10.02 15 830 10.11 19 540 10.20 23 850 10.31 28 830 10.44 34 540 10.61 41 050 10.82 48 420 11.0960 - - 10 290 12.38 12 960 12.46 16 090 12.54 19 730 12.61 23 960 12.70 28 850 12.81 34 460 12.96 40 860 13.1668 - - - - - - 13 030 14.84 16 090 14.90 19 670 14.96 23 860 15.03 28 700 15.14 34 270 15.28

PSH030-4

20 13 780 5.98 21 300 6.25 26 190 6.44 31 920 6.71 38 570 7.06 46 210 7.51 54 930 8.08 - - - -30 12 240 7.26 19 280 7.48 23 780 7.63 29 040 7.83 35 130 8.09 42 120 8.44 50 090 8.89 59 120 9.45 69 270 10.1540 10 670 8.85 17 110 9.06 21 170 9.18 25 910 9.34 31 380 9.54 37 670 9.81 44 840 10.16 52 980 10.61 62 160 11.1750 8 990 10.84 14 720 11.09 18 300 11.21 22 460 11.34 27 260 11.50 32 790 11.71 39 120 11.99 46 320 12.35 54 460 12.8060 - - 12 070 13.65 15 110 13.79 18 630 13.92 22 710 14.07 27 430 14.24 32 850 14.47 39 050 14.75 46 120 15.1268 - - - - - - 15 250 16.46 18 710 16.61 22 740 16.78 27 400 16.97 32 770 17.22 38 930 17.53

PSH034-4

20 15 400 6.67 23 950 6.99 29 530 7.24 36 080 7.57 43 680 7.99 52 430 8.53 62 400 9.20 - - - -30 13 590 8.16 21 680 8.39 26 860 8.57 32 900 8.81 39 900 9.14 47 920 9.56 57 060 10.09 67 400 10.76 79 020 11.5740 11 800 10.03 19 260 10.21 23 960 10.34 29 420 10.51 35 720 10.75 42 950 11.07 51 180 11.49 60 500 12.02 70 990 12.6850 9 910 12.43 16 590 12.60 20 730 12.69 25 530 12.81 31 060 12.98 37 410 13.22 44 650 13.54 52 870 13.95 62 160 14.4860 - - 13 580 15.70 17 090 15.77 21 140 15.86 25 820 15.98 31 210 16.15 37 380 16.38 44 430 16.69 52 440 17.1068 - - - - - - 17 220 18.94 21 160 19.03 25 720 19.15 30 980 19.33 37 030 19.57 43 950 19.90

PSH039-4

20 17 880 7.41 27 450 7.90 33 630 8.20 40 880 8.54 49 280 8.94 58 930 9.41 69 930 9.97 - - - -30 15 910 8.92 24 920 9.39 30 660 9.66 37 350 9.96 45 080 10.31 53 950 10.71 64 060 11.19 75 500 11.75 88 360 12.4140 13 830 10.84 22 120 11.31 27 330 11.56 33 370 11.84 40 350 12.14 48 360 12.49 57 490 12.90 67 840 13.39 79 510 13.9550 11 600 13.27 18 990 13.78 23 580 14.02 28 900 14.28 35 040 14.56 42 100 14.87 50 160 15.23 59 340 15.64 69 720 16.1260 - - 15 480 16.89 19 370 17.15 23 880 17.40 29 100 17.67 35 120 17.95 42 040 18.27 49 960 18.63 58 970 19.0468 - - - - - - 19 440 20.47 23 850 20.73 28 980 21.00 34 930 21.29 41 780 21.62 49 630 21.99

Te -30 -20 -15 -10 -5 0 5 10 15

Tc Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

Heating (W)

Pe(kW)

PSH019-4

20 12 490 4.00 17 740 4.35 21 070 4.49 24 930 4.62 29 400 4.74 34 520 4.85 40 340 4.98 - - - -30 12 360 4.89 17 370 5.29 20 490 5.46 24 100 5.61 28 240 5.74 32 980 5.88 38 360 6.02 44 460 6.17 51 320 6.3440 12 230 5.82 16 890 6.26 19 760 6.44 23 040 6.61 26 810 6.76 31 110 6.91 36 000 7.06 41 550 7.22 47 790 7.3950 12 260 7.00 16 480 7.46 19 020 7.65 21 940 7.83 25 270 7.99 29 090 8.14 33 430 8.30 38 370 8.46 43 950 8.6360 - - 16 290 9.09 18 470 9.29 20 960 9.47 23 820 9.63 27 090 9.78 30 830 9.94 35 110 10.10 39 980 10.2768 - - - - - - 20 390 11.22 22 820 11.38 25 620 11.53 28 850 11.68 32 560 11.83 36 810 11.99

PSH023-4

20 14 880 4.81 20 810 5.02 24 660 5.16 29 190 5.33 34 460 5.54 40 540 5.79 47 480 6.10 - - - -30 14 740 5.80 20 360 6.00 23 950 6.12 28 140 6.27 33 000 6.45 38 590 6.67 44 970 6.92 52 220 7.23 60 400 7.5940 14 770 7.02 19 980 7.23 23 260 7.35 27 060 7.48 31 450 7.64 36 510 7.82 42 290 8.04 48 850 8.31 56 270 8.6250 15 000 8.54 19 710 8.78 22 620 8.90 25 980 9.03 29 870 9.18 34 340 9.34 39 460 9.54 45 300 9.76 51 910 10.0360 - - 19 580 10.72 22 070 10.86 24 960 11.00 28 280 11.14 32 120 11.30 36 540 11.48 41 600 11.68 47 360 11.9168 - - - - - - 24 190 12.92 27 040 13.07 30 340 13.23 34 160 13.40 38 560 13.59 43 610 13.81

PSH026-4

20 16 920 5.40 23 770 5.67 28 230 5.83 33 480 6.03 39 610 6.27 46 690 6.57 54 810 6.94 - - - -30 16 730 6.52 23 180 6.75 27 310 6.88 32 140 7.04 37 760 7.23 44 240 7.47 51 670 7.76 60 120 8.13 69 670 8.5740 16 780 7.95 22 700 8.17 26 430 8.28 30 780 8.40 35 830 8.55 41 650 8.73 48 330 8.95 55 940 9.24 64 570 9.5950 17 130 9.80 22 400 10.02 25 670 10.11 29 470 10.20 33 880 10.31 38 980 10.44 44 850 10.61 51 570 10.82 59 210 11.0960 - - 22 340 12.38 25 090 12.46 28 280 12.54 32 000 12.61 36 320 12.70 41 310 12.81 47 070 12.96 53 660 13.1668 - - - - - - 27 460 14.84 30 580 14.90 34 220 14.96 38 480 15.03 43 420 15.14 49 130 15.28

PSH030-4

20 19 410 5.98 27 180 6.25 32 250 6.44 38 240 6.71 45 220 7.06 53 290 7.51 62 540 8.08 - - - -30 19 080 7.26 26 320 7.48 30 960 7.63 36 410 7.83 42 750 8.09 50 070 8.44 58 460 8.89 68 020 9.45 78 830 10.1540 19 000 8.85 25 640 9.06 29 820 9.18 34 700 9.34 40 370 9.54 46 910 9.81 54 410 10.16 62 970 10.61 72 680 11.1750 19 190 10.84 25 170 11.09 28 860 11.21 33 140 11.34 38 100 11.50 43 820 11.71 50 410 11.99 57 940 12.35 66 520 12.8060 - - 24 920 13.65 28 090 13.79 31 740 13.92 35 960 14.07 40 840 14.24 46 470 14.47 52 950 14.75 60 350 15.1268 - - - - - - 30 750 16.46 34 360 16.61 38 540 16.78 43 390 16.97 48 990 17.22 55 440 17.53

PSH034-4

20 21 570 6.67 30 420 6.99 36 220 7.24 43 070 7.57 51 070 7.99 60 320 8.53 70 910 9.20 - - - -30 21 140 8.16 29 440 8.39 34 780 8.57 41 050 8.81 48 350 9.14 56 760 9.56 66 400 10.09 77 350 10.76 89 720 11.5740 21 070 10.03 28 700 10.21 33 520 10.34 39 140 10.51 45 660 10.75 53 180 11.07 61 800 11.49 71 610 12.02 82 720 12.6850 21 410 12.43 28 230 12.60 32 470 12.69 37 380 12.81 43 070 12.98 49 630 13.22 57 170 13.54 65 770 13.95 75 550 14.4860 - - 28 090 15.70 31 680 15.77 35 810 15.86 40 600 15.98 46 140 16.15 52 530 16.38 59 870 16.69 68 250 17.1068 - - - - - - 34 730 18.94 38 760 19.03 43 430 19.15 48 860 19.33 55 130 19.57 62 350 19.90

PSH039-4

20 25 070 7.41 35 120 7.90 41 590 8.20 49 160 8.54 57 950 8.94 68 060 9.41 79 600 9.97 - - - -30 24 560 8.92 34 040 9.39 40 030 9.66 47 010 9.96 55 080 10.31 64 350 10.71 74 920 11.19 86 900 11.75 100 400 12.4140 24 340 10.84 33 100 11.31 38 550 11.56 44 850 11.84 52 130 12.14 60 480 12.49 70 010 12.90 80 830 13.39 93 040 13.9550 24 470 13.27 32 360 13.78 37 190 14.02 42 750 14.28 49 160 14.56 56 520 14.87 64 940 15.23 74 520 15.64 85 370 16.1260 - - 31 870 16.89 36 010 17.15 40 770 17.40 46 240 17.67 52 530 17.95 59 760 18.27 68 030 18.63 77 450 19.0468 - - - - - - 39 290 20.47 43 960 20.73 49 360 21.00 55 580 21.29 62 750 21.62 70 970 21.99

Refrigerant: R410A Frequency 60 Hz Subcooling: 4K Superheat: 5KSubject to modification without prior notification. For full data details and capacity table, refer to Online Datasheet Generator: www.danfoss.com/odsg

7FRCC.PC.022.A6.02


Dimensions

PSH019

15 mm

HM 8 bolt

Lock washer

Flat washer

Steel mountingsleeve

Rubber grommet

Nut

Mounting grommet

Ø224

Ø245

4 holeØ19.05

Ø32 oil equalisation 1.75”-12 UN-2A

230 (2x)

230(2x)

190.5 (2x)

190.5(2x)

121

206

154

158

30°±1°

30°±0.5°

60°±1°

Ø220.8

Discharge 7/8”

Suction1”1/8

Ø32 oil equalisation

Liquid injectionØ8

41

436

377

469.7±3190

219.5

Without compression 15.25

10178.7

8 FRCC.PC.022.A6.02


Dimensions

PSH023-026-030-034

15 mm

HM 8 bolt

Lock washer

Flat washer


Rubber grommet

Nut

Mounting grommet

Ø224

Ø221

493.5

Ø243

4 x hole Ø19.05

Ø245

Ø32 oil equalisation1.75” - 12 UN - 2A

230 (x2)

230 (x2)

190.5 (x2)

190.5(x2)

Suction 1”3/8

Discharge 7/8”

41

190435

148

86

121

207

154173

527.2±3

30°±0.5°

30°±1°

60°±1°

262.5

15.25(Without compression)

Liquid injection Ø8

9FRCC.PC.022.A6.02


Dimensions

PSH039

15 mm

HM 8 bolt

Lock washer

Flat washer


Rubber grommet

Nut

Mounting grommet

Ø 234

Liquid injection Ø8

Discharge 7/8”

509

Ø 232.1

Ø 243

Ø 245

Ø 32 Oil equalisation1.75” - 12 UN - 2A

15.25(without compression)

Suction 1”3/8

42

190450

542.7±3

284

230 (2x)

230(2x)

190.5 (2x)

190.5(2x)

127

206

159

173

30° ±1°

30° ±0.5°

60° ±1°

163

92.5

10 FRCC.PC.022.A6.02


Electrical data, connections and wiring

All Danfoss PSH scroll compressors come equipped with a sight glass (1”1/8 - 18 UNF)

which may be used to determine the amount and condition of the oil contained within the sump.

Connection Details PSH019-023-026-030-034-039Bare compressor version Full package version

Suction and discharge connections Brazed BrazedOil sight glass Threaded ThreadedOil equalization connection Rotolock 1”3/4 Rotolock 1”3/4Oil drain connection none noneLow pressure gauge port (shrader) ¼” flare ¼” flareLiquid Injection valve connection none 5/16”ODF

Brazed version

Tube ODF

PSH019Suction 1”1/8Discharge 7/8”

PSH023-026-030-034-039Suction 1”3/8Discharge 7/8”

Suction and discharge connections

Oil sight glass

Oil equalisation connection

PSH019-023-026-030-034-039 are equipped with a 1”3/4 rotolock connector allowing the use of 1”3/4 - 7/8” or 1”3/4 - 1”1/8 sleeve. This

connection must be used to mount the oil equalisation line when two or more compressors are mounted in parallel.

The oil fill connection and gauge port is a 1/4” male flare connector incorporating a Schrader valve.

Schrader

Liquid injection valve The liquid injection valve comes equipped with process tube, maintained by a bracket, assembled on compressor shell. This process tube is to be connected with a 5/16” piping.

Danfoss PSH scroll compressor is optimized for heat pump applications. Scroll elements pressure ratio optimization and liquid injection management system is developed for extreme conditions running.

PSH Scroll compressor is also equipped with several pre-wired devices that enhance compressor reliability.

Liquid injection is controlled by discharge gas temperature sensor plugged to the control board placed in the terminal box.

Note: PSH bare compressor version is not equipped with liquid injection valve.

Coil

Support brackets

Pipe OD diameter 5/16”

Liquid Injection Valve (LIV)

Process tubeTerminal box with control boardLiquid injection auto control

11FRCC.PC.022.A6.02



The operating voltage limits are shown in the table section “Motor voltage”. The voltage applied to the motor terminals must lie within these table limits during both start-up and normal operations. The maximum allowable voltage

imbalance is 2%. Voltage imbalance causes high amperage over one or several phases, which in turn leads to overheating and possible motor damage. Voltage imbalance is given by the formula:

Motor voltage

Voltage imbalance

Electrical data

Compressor modelsLRA MCC Maximum Operating

Current Winding resistance

A A A Ω

Motor code 3

PSH019 203 43 38 0.39PSH023 267 51 50 0.27PSH026 267 61 53 0.27PSH030 304 64 56 0.24PSH034 315 69 64 0.22PSH039 351 75 71 0.22

Motor code 4

PSH019 98 20 19 1.47PSH023 142 23 22 1.05PSH026 142 29 24 1.05PSH030 147 30 28 0.92PSH034 158 33 31 0.83PSH039 197 38.6 36 0.83

Motor code 9

PSH019 124 26 23 1.05PSH023 160 33 26 0.72PSH026 160 35 29 0.72PSH030 168 37 33 0.62PSH034 177 41 37 0.57PSH039 239 51 44 0.57

| Vavg - V1-2 | + | Vavg - V1-3 | + | Vavg - V2-3 |% voltage imbalance= __________________________________________________ x100 2 x Vavg

Motor voltage code Code 3 Code 4 Code 9

50 Hz Nominal voltage - 380-400V - 3 ph -

Voltage range - 340-440 V -

60 HzNominal voltage 200-230V - 3 ph 460V - 3 ph 380V- 3 ph

Voltage range 180-253 V 414-506 V 342-418 V

Vavg = Mean voltage of phases 1, 2, 3V1-2 = Voltage between phases 1 & 2

V1-3 = Voltage between phases 1 & 3V2-3 = Voltage between phases 2 & 3

12 FRCC.PC.022.A6.02



CC L1 L2 L3

KM

Q1

A1

A2

DGT

HP

KS

KSKA KA

KA

LPS

LPS

KA

KS

KM

A3180s

OCSM

T3

T1 T2

F1F1

Locked Rotor Amp value is the highest average current as measured on mechanically blocked compressor tested under nominal voltage. The LRA value can be used as rough estimation for

the starting current. However in most cases, the real starting current will be lower. A soft starter can be applied to reduce starting current.

The MCC is the current at which the motor protection trips under maximum load and low voltage conditions. This MCC value is the

maximum at which the compressor can be operated in transient conditions and out of the application envelope.

The wiring diagram below is example for a safe and reliable compressor wiring. In case an alternative wiring logic is chosen, it is imperative to respect the following rules: when a safety switch trips, the compressor must stop

immediately and must not re-start until tripping condition is back to normal and the safety switch is closed again. This applies to the LP safety switch, the HP safety switch, the discharge gas thermostat and the motor safety thermostat.

Winding resistance is the resistance between phases at 25°C (resistance value +/- 7%).

Winding resistance is generally low and it requires adapted tools for precise measurement. Use a digital ohm-meter, a “4 wires” method and measure under stabilised ambient temperature. Winding resistance varies strongly with winding temperature; if the compressor is stabilised at a different value than 25°C, the measured resistance must be corrected with following formula:

a + tamb

Ramb = R25°C _____________ a + t25°C

t25°C : reference temperature = 25°Ctamb: temperature during measurement (°C)R25°C: winding resistance at 25°CRamb: winding resistance at tambCoefficient a = 234.5

The max. operating current is the current when the compressors operates at maximum load conditions and 10% below nominal voltage (+15°C evaporating temperature and +68°C condensing temperature). Max Oper. Current can be used to select cables and contactors.

In normal operation, the compressor current consumption is always less than the Max Oper. A.value.

LRA (Locked Rotor Amp)

MCC (Maximum Continuous Current)

Max. operating Current

Winding resistance

General wiring information

Legend:Fuses .................................................................... F1Compressor contactor .................................. KMControl relay ..................................................... KASafety lock out relay ........................................KSOptional short cycle timer (3 min) ......... 180 sHigh pressure safety switch .......................... HPFused disconnect ............................................. Q1Compressor motor ............................................MDischarge gas temperature ....................... DGTSafety pressure switch ...................................LPSControl circuit ...................................................CCOperating Control System ..........................OCS

13FRCC.PC.022.A6.02



Wiring Connections Electrical supply is connected to the compressor terminals by Ø 4.8 mm (3/16”) screws. The maximum tightening torque is 3 Nm. Use a ¼” ring terminal on the power leads. The compressor must be connected to earth with the 5mm earth terminal screw.

The control board comes pre-installed within the terminal box of full package compressor. The control board comes with pre-wired liquid injection valve connection, is used to provide control of liquid injection valve according to feedback of discharge temperature sensor. The discharge gas temperature cable must be plugged to the discharge temperature sensor installed on discharge tube by customer.

The control board must be connected to:• a power supply of the appropriate voltage

(230VAC) with a 2 poles 7.62 mm pitch terminal block (an independent power supply is recommended).

• a 1/4” fasten earth connection for 230V supply models.

Plug and unplug connector on board with electricity is forbidden. Never touch board with electricity by hand or tool. Cable connected to control board can not be short circuit or connect to high voltage.

IP Rating The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated cable glands are used.

First numeral, level of protection against contact and foreign object5- Dust protected

Second numeral, level of protection against water4- Protection against water splashing

control board power supply

liquid injection valve control (pre-wired)

discharge temperature sensor PT1000

main power supplyLiquid injection valve control

14 FRCC.PC.022.A6.02



The temperature inside the terminal box may not exceed 70°C. Consequently, if the compressor is installed in an enclosure, precautions must be taken to avoid that the temperature around the compressor and in the terminal box would rise too much. The installation of ventilation on the enclosure panels may be necessary. If not, the

control board may not operate properly. Any compressor damaged related to this will not be covered by Danfoss warranty. In the same manner, cables must be selected in a way to insure that terminal box temperature does not exceed 70°C.

The compressors models PSH019-023-026-030-034-039 have been provided with an internal overload protection to prevent against excessive current and temperature caused by overloading, low refrigerant flow or phase loss. The cutout current is the MCC value listed before.

The protector is located in the star point of the motor and, should it be activated, will cut out all three phases. It will be reset automatically. While

not compulsory, an additional external overload is still advisable for either alarm or manual reset.

Then it must be set below MCC value:• When the motor temperature is too high, then

the internal protector will trip.• When the current is too high the external

overload protection will trip before the internal protection therefore offering possibility of manual reset.

Use a phase meter to establish the phase orders and connect line phased L1, L2 and L3 to terminals T1, T2 and T3, respectively. The compressor will only operate properly in a single direction, and the motor is wound so that if the connection is correct, the rotation will also be correct.

The compressor models PSH019-023-026-030-034-039 incorporate an internal reverse vent valve which will react in the presence of reverse rotation and will allow refrigerant to circulate through a by-pass from the suction to the discharge. Although reverse rotation is

not destructive for these models, it should be corrected as soon as possible. Reverse rotation will be obvious to the user as soon as power is turned on, the compressor will not build up pressure, the sound level will be abnormally high and power consumption will be minimal. If reverse rotation symptoms occur, shut the compressor down and connect the phases to their proper terminals. If reverse rotation is not halted, the compressor will cycle off on the motor protection.

Terminal box temperature

Terminal box knock-out dimensions

Compressor protection

The terminal box is provided with a Ø 25.5 mm knockout for main power supply and a sealed hole for other wirings to control board.

Motor protection

Compressor model Overheating protection Over current protection Locked rotor protection Phase reversal protection

PSH019-023-026-030-034-039 Internal motor protection Internal reverse vent valve

Phase sequence and reverse rotation protection

15FRCC.PC.022.A6.02


Approvals and certificates

PSH scroll compressors comply with the following approvals and certificates.

Certificates are listed on the product datasheets: http://www.danfoss.com/odsg

Approvals and certificates

Pressure Equipment Directive 2014/68/EU

Machines directive2006/42/EC

Low voltage directive 2014/35/EU

Internal free volume

CE 0062 or CE 0038 or CE0871 (European Directive) All PSH models

UL (Underwriters Laboratories) All 60 Hz PSH models

Other approvals / certificates Contact Danfoss

Products PSH019 to 039

Manufacturer's declaration of incorporation ref. Machines Directive 2006/42/EC Contact Danfoss


Declaration of conformity ref. Low voltage Directive 2014/35/EU Contact Danfoss

Products Internal free volume without oil (litre)

PSH019 12.4PSH023-026-030-034 14.3PSH039 14.6


Refrigerating fluids Group 2Category PED IIEvaluation module D1Service temperature - Ts -35°C < Ts < 55°CService pressure - Ps 33.3 bar(g)Declaration of conformity contact Danfoss

16 FRCC.PC.022.A6.02


Operating conditions

PSH compressors are to be used with R410A refrigerant,with polyolester oil.

• R410A’s superior thermodynamical properties compared to R22 and R407C refrigerants allow for today’s massive – and necessary – switch to high efficiency systems.• Zero Ozone Depletion Potential (ODP): R410A doesn’t harm the ozone layer.• Global warming potential (GWP): R410A shows a relatively high warming potential. However, the GWP index denotes direct warming effect,which is relevant only in case of release to the atmosphere.

A more accurate index is T.E.W.I., for Total Equivalent Warming Impact, which takes into account indirect contributions due to running energy costs.

• Because of the higher system efficiency it allows to achieve, R410A is in this regard the best refrigerant.• As a near-azeotropic mixture, refrigerant R410A behaves like an homogeneous substance, whereas other zeotropic mixtures such as R407C and other blends suffer a temperature glide during phase change that lessens thermal efficiency and makes them difficult to transfer from a container to another.• Reduced refrigerant mass flow, permitted by a higher heat capacity, induce a lower sound level of the installation as well as more compact and lighter systems.

Polyolester oil (POE) is miscible with HFC’s (while mineral oil is not), but has to be evaluated regarding lubrication ability in compressors. POE oil has better thermal stability than refrigerant mineral oil.

POE is more hygroscopic and also holds moisture tighter than mineral oil. It also chemically reacts with water leading to acid and alcohol formation.

PSH scroll compressors can be operated at nominal voltages as indicated in the section “Motor voltage”. Under-voltage and over-voltage

operation is allowed within the indicated voltage ranges. In case of risk of under-voltage operation, special attention must be paid to current draw.

PSH compressors can be applied from -35°C to 51°C ambient temperature, when charged with refrigerant. The compressors are designed

as 100% suction gas cooled without need for additional fan cooling. Ambient temperature has very little effect on the compressor performance.

In case of enclosed fitting and high ambient temperature it’s recommend to check the temperature of power wires and conformity to their insulation specification. In case of safe tripping by the internal compressor overload

protection the compressor must cool down before the overload will reset. A high ambient temperature can strongly delay this cool-down process.

Although the compressor itself can withstand low ambient temperature, the system may require specific design features to ensure safe

and reliable operation. See section ‘Specific application recommendations’.

Refrigerant and lubricants

R410A

POE oil

Motor supply

Compressor ambient temperature

High ambient temperature

Low ambient temperature

17FRCC.PC.022.A6.02



Continuous operations beyond the compressor’s operating envelope will cause serious damage to the compressor. In this case, an additional discharge gas temperature protection device is required for compressor protection.

The discharge gas temperature protection device must be attached to the discharge line within

40mm from the compressor discharge port and must be thermally insulated and tightly fixed on the discharge pipe.

The protection setting value should be 135°C, to shut down the compressor when the measured temperature reach this value.

Discharge temperature protection

The operating envelope for PSH scroll compressors is given in the figure below, where the condensing and evaporating temperatures represent the range for steady-state operation. The operating limits serve to define the envelope within which reliable operations of the compressor are guaranteed:• Maximum discharge gas temperature: +135°C

• A suction superheat below 4K is not allowed due to the risk of liquid flood back,

• Maximum suction superheat of 20K • A subcooling below 4K is not recommended to

ensure proper liquid injection,• Minimum and maximum evaporating and

condensing temperatures as per the operating envelopes.

Application envelope

10

20

30

40

50

60

70

Cond

ensi

ng te

mpe

ratu

re (°

C)

HeatingSH5K

-35 -30 -20 -10 0 10 20-25 -15 -5 5 15 25

Evaporating temperature (°C)

High and low pressure protection

A high pressure (HP) safety switch is required to shut down the compressor should the discharge pressure exceed the values shown in the table below. The high pressure switch can be set to lower values depending on the application and ambient conditions. The HP switch must either be

placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit. If a discharge valve is used, the HP switch must be connected to the service valve gauge port, which must not be isolated.

High pressure

18 FRCC.PC.022.A6.02



Note that these two different low pressure switches require different setting. The low pressure pump down switch setting must always be within the operating envelope, for example 2.3 bar for R410A. The compressor can be operated full time under such condition. The

minimum low pressure safety switch setting may be outside the normal operating envelope and should only be reached in exceptional (emergency) situations, for example 1.5 bar for R410A.

A low-pressure (LP) safety switch must be used. Deep vacuum operation of a scroll compressor can cause internal electrical arcing and scroll instability. Danfoss PSH scroll compressor exhibit high volumetric efficiency and may draw very low vacuum levels, which could induce such a problem. The minimum low pressure safety switch setting is given in the following table.

For systems without pump-down, the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit. The LP switch tolerance must not allow for vacuum operations of the compressors. LP switch setting for pump down cycles with automatic reset are also listed in the table below.

Low pressure

Pressure settings bar(g) R410A

Working pressure range high side 13.5-44.5

Working pressure range low side 1.7-15.5

Maximum high pressure safety switch setting 45

Minimum low pressure safety switch setting* 1.5

Minimum low pressure pump-down switch setting** 1.7*LP safety switch shall never be bypassed and shall have no time delay.**Recommended pump-down switch setting: 1.5 bar below nominal evaporating pressure with minimum of 2.3 bar(g).

Danfoss PSH requires liquid injection to maintain sufficiently low discharge gas temperature in the operating envelope. The PSH compressors are provided with a liquid injection connection.

Refrigerant in liquid phase is directly injected in the scroll set. The Liquid Injection Valve is activated according to the discharge temperature.

Liquid injection is active for when discharge temperature exceed 121°C and will regulate to keep constant this discharge temperature.

The discharge temperature sensor must use PT1000. The discharge temperature sensor must have a quick response, be attached on the surface of discharge pipe within 40mm away from compressor discharge fitting, the sensor should be fixed by a metallic collar, have a good thermal contact by adding thermal paste and be insulated from ambient disturbance by thermal wrap.

A minimum 4K subcooling is necessary to ensure correct liquid injection.

Liquid Injection

In(P)Pc

Pi

Po

h (kJ/kg)

LIV

Sol V

Discharge T sensor

Control

CondenserFilter drier

EXVEvaporator

19FRCC.PC.022.A6.02



Cycle rate limit Danfoss recommends a restart delay timer to limit compressor cycling. The timer prevents reverse compressor rotation, which may occur during brief power interruptions. The system must be designed in a way that guarantees a minimum compressor running time of 2 minutes so as to provide for sufficient motor

cooling after start-up along with proper oil return. Note that the oil return may vary since it depends upon system design. There must be no more than 12 starts per hour, a number higher than 12 reduces the service life of the motor-compressor unit. A three-minute (180-sec) time out is recommended.

T T

THTH

KA

A1 A2 A3A1 180 s

A2 KA

~

~

Please contact Danfoss Technical Support for any deviation from this guideline.

The Liquid Injection Valve (LIV) is a ETS6 stepper valve. This valve is closed when the compressors is idle. An additional solenoid valve has to be installed in case of power shortage to prevent liquid entry to compressor when compressor is off. Only one solenoid valve per unit is required.

Injection pick-up has to be done at the bottom side of the liquid line piping and downstream the filter dryer.

A filter is required before liquid injection pipe in order to avoid debris blocking liquid injection pipe.

A minimum 4k subcooling is necessary to ensure good liquid injection.

20 FRCC.PC.022.A6.02


System design recommendations

HP

4 m/s or more

0.5% slope

To condenser

max. 4 m

max. 4 m

0.5% slope

U-trap, as short as possible

U-trap

4m/s or more

U trap, as short as possible

Evaporator

LP

8 to 12 m/s

If the evaporator lies above the compressor, as is often the case in split or remote condenser systems, the addition of a pump-down cycle is strongly recommended. If a pump-down cycle were to be omitted, the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles.

If the evaporator were situated below the compressor, the suction riser must be trapped so as to prevent liquid refrigerant from collecting at the outlet of the evaporator while the system is idle, which would mislead the expansion valve’s sensor (thermal bulb) at start-up.

The working pressure in systems with R410A is about 60% higher than in systems with R22 or R407C. Consequently, all system components and piping must be designed for this higher pressure level.

Proper piping practices should be employed to ensure adequate oil return, even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator. Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles.

In systems with R410A, the refrigerant mass flow will be lower compared to R22/R407C systems. To maintain acceptable pressure drops and acceptable minimum gas velocities, the refrigerant piping must be reduced in size

compared to R22 / R407C systems. Take care not to create too high pressure drops or since in R410A systems the negative impact of high pressure drops on the system efficiency is stronger than in R22/R407C systems.

Piping should be designed with adequate three-dimensional flexibility. It should not be in contact with the surrounding structure, unless a proper tubing mount has been installed. This protection proves necessary to avoid excess vibration, which can ultimately result in connection or tube failure due to fatigue or wear from abrasion. Aside from tubing and connection damage, excess vibration may be transmitted to the surrounding structure and generate an unacceptable noise level within that structure as well. For more information on noise and vibration, see the section on: «Sound and vibration management».

Successful application of scroll compressors is dependent on careful selection of the compressor for the application. If the compressor is not correct for the system, it will operate

beyond the limits given in this manual. Poor performance, reduced reliability, or both may result.

Essential piping design considerations

General

Suction lines

21FRCC.PC.022.A6.02



HP

LP

Condenser

3D flexibility

U Trap

Upper loop

To obtain optimum efficiency of the complete refrigerant system, optimized R410A heat exchangers must be used. R410A refrigerant has good heat transfer properties: it is worthwhile designing specific heat exchangers to gain in size and efficiency.

An evaporator with optimized R410A distributor and circuit will give correct superheat at outlet and optimal use of the exchange surface. This is critical for plate evaporators that have generally a shorter circuit and a lower volume than shell & tubes and air cooled coils.

For all evaporator types a special care is required for superheat control leaving the evaporator and oil return.

A sub-cooler circuit in the condenser that creates high sub cooling will increase efficiency at high condensing pressure. In R410A systems the positive effect of sub cooling on system efficiency will be significantly larger than in R22/R407C systems.

Furthermore, for good operation of the expansion device and to maintain good efficiency in the evaporator it is important to have an appropriate sub cooling. Without adequate sub cooling, flash gas will be formed at the expansion device resulting in a high degree of vapour at the expansion device inlet leading to low efficiency.

Heat exchangers

When the condenser is mounted at a higher position than the compressor, a suitably sized «U»-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the compressor during off cycle. The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped.

Discharge lines

Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation, when the system uses a bleed-type expansion device, or if liquid is allowed to migrate from the evaporator into the compressor sump by gravity. If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start: when the compressor starts running again, the refrigerant evaporates abruptly under the sudden decrease of the bottom shell pressure, causing the oil to foam. In extreme situations, this might result in liquid slugging (liquid entering the scroll elements), which must be avoided as it causes irreversible damage to the compressor.

Danfoss PSH scroll compressors can tolerate occasional flooded starts as long as the total system charge does not exceed the maximum compressor refrigerant charge.

A suitable test to evaluate the risk of off-cycle migration is the following:• Stabilize the non running system at 5°C

ambient temperature,• Raise the ambient temperature to 20°C and

keep it for 10 minutes,• Start the compressor and monitor sump

temperature, sight glass indication and sound level.

The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass. Foam in the oil sump indicates a flooded start.

A noisy start, oil loss from the sump and sump cool down are indications for migration. Depending on the amount of migration graduate measures shall be taken:• Sump heater• Liquid line solenoid valve• Pump down cycle

22 FRCC.PC.022.A6.02



A LLSV must be used to isolate the liquid charge on the condenser side, thereby preventing against charge transfer or excessive migration to the compressor during off-cycles. The quantity of

refrigerant on the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV.

Liquid line solenoid valve (LLSV)

Pump-down cycle A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of liquid refrigerant. Once the system has reached its set point and is about to shut off, the LLSV on the condenser outlet closes. The compressor then pumps the majority of the refrigerant charge into the condenser and receiver before the system stops on the low pressure pump-down switch. This step reduces the amount of charge on the low side in order to prevent off-cycle migration. The recommended low-pressure pump-down switch setting is 1.5 bar below the nominal evaporating pressure. It shall not be set lower than 1.7 bar(g). For suggested wiring diagrams, please see section "Suggested wiring diagrams logic".

Tests for pump down cycle approval:• As the pump-down switch setting is inside the

application envelope, tests should be carried out to check unexpected cut-out during transient conditions (ie. defrost – cold starting). When unwanted cut-outs occur, the low pressure pump-down switch can be delayed. In this case a low pressure safety switch without any delay timer is mandatory.

• While the thermostat is off, the number of pressure switch resets should be limited to avoid short cycling of the compressor. Use dedicated wiring and an additional relay which allows for one shot pump-down.

The pump-down allows to store all the refrigerant in the high pressure side circuit. On unitary or close-coupled systems, where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized.

Other application needs a liquid receiver to store the refrigerant.

Receiver dimensioning requires special attention. The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large. A large receiver easily leads to refrigerant overcharging during maintenance operation.

Sump heater The surface sump heaters or other equivalent heaters are required to protect the PSH compressor against off-cycle migration of refrigerant.

When the compressor is idle, the oil temperature in the sump of the compressor must be maintained at no lower than 10 K above the saturation temperature of the refrigerant on the low-pressure side. This requirement ensures that the liquid refrigerant is not accumulating in the sump. A sump heater is only effective if capable of sustaining this level of temperature difference. Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind). Note that below –5°C ambient temperature and a wind speed of above 5m/second, we recommend that the heaters be thermally insulated in order to limit the surrounding energy losses.

Initial start-up: due to light commercial platform compact design, it is recommended to energize surface sump heater in advance to remove

refrigerant at initial start-up only 6 hours in advance.

Then the heater must be energized whenever the compressor is off to avoid liquid refrigerant entering the compressor.

Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg. Seasonal shutdown).Surface sump heater accessories are available from Danfoss (see section "Accessories").

23FRCC.PC.022.A6.02



Liquid flood back

Suction accumulator: a suction accumulator offers protection against refrigerant flood back at start-up, during operations or defrosting by trapping the liquid refrigerant upstream from the compressor. The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system.

A suction accumulator must be carefully dimensioned, taking into account the refrigerant charge as well as the gas velocity in the suction line.

The accumulator should not be sized for less than 50 % of the total system charge. Tests must be conducted to determine the actual refrigerant holding capacity needed for the application.

Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line.

During normal operation, refrigerant enters the compressor as a superheated vapour. Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state.

Danfoss PSH scroll compressors can tolerate occasional liquid flood back. However system

design must be such that repeated and excessive flood back is not possible.

A continuous liquid flood back will cause oil dilution and, in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor.

Liquid flood back test - Repetitive liquid flood back testing must be carried out under expansion valve threshold operating conditions: a high pressure ratio and minimum evaporator load, along with the measurement of suction superheat, oil sump temperature and discharge gas temperature.

During operations, liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature. If at any time during operations, the oil sump temperature drops to within 10K or less above

the saturated suction temperature, or should the discharge gas temperature be less than 35K above the saturated discharge temperature, this indicates liquid flood back.

Continuous liquid flood back can occur with a wrong dimensioning, a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters.

A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back.

24 FRCC.PC.022.A6.02


Specific application recommendations

The Danfoss PSH scroll compressor requires a minimum pressure differential between the suction and discharge pressures (please refer to operation envelop) to force the orbiting scroll down against the oil film on the thrust bearing. Anything less than this differential and the orbiting scroll can lift up, causing a metal-to-metal contact. It is therefore necessary to maintain sufficient discharge pressure in order to ensure this pressure differential. Care should be taken during low ambient operations when heat removal from air-cooled condensers is greatest and head pressure control may be required for low ambient temperature applications. Operation under low pressure differential may be observed by a significant increase in the sound power level generated by the compressor.

It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well. The following considerations should be taken into account to ensure proper system operating characteristics.

Expansion device: The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator. An oversized valve may result in erratic control. This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors. This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads.

The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods. A minimum of 5 K stable superheat is required.

Head pressure control under low ambient conditions: Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures.

In air-cooled machines, cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level. Variable speed fans can also be used to control the condensing pressure. In water-cooled units, the same can be performed using a water regulator valve that is also operated by head pressure, thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level.

The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes.

Under very low ambient conditions, in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures, the use of a head pressure control valve is recommended. Note: This solution requires extra refrigerant charge, which can introduce other problems. A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line.

For further information, please contact Danfoss.

Low ambient start-upLow ambient application

Under cold ambient conditions (<0°C), upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator.

As a result, the compressor may go into a deep vacuum, which can lead to compressor failure due to internal arcing and instability in the scroll wraps. Under no circumstances should the compressor be allowed to operate under vacuum. The low-pressure control must be set in accordance with the table section "Low pressure" in order to prevent this from happening.

Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects.

Low pressure differentials can also cause the expansion device to «hunt» erratically, which might cause surging conditions within the evaporator, with liquid spillover into the compressor. This effect is most pronounced during low load conditions, which frequently occur during low ambient conditions.

Low ambient operations

25FRCC.PC.022.A6.02



EXV Opened

Closed

Compressor On

Off

Brazed plate heat exchangers

Electronic expansion valve

A brazed plate heat exchanger needs very little internal volume to satisfy the set of heat transfer requirements. Consequently, the heat exchanger offers very little internal volume for the compressor to draw vapour from on the suction side. The compressor can then quickly enter into a vacuum condition. It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator. This aspect is of special concern when operating the unit under low ambient and load conditions. For further information on these conditions, please refer to the previous sections.

Due to the small volume of the brazed plate heat exchanger, no pump-down cycle is normally required. The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor.

When using a brazed plate condenser heat exchanger, a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up. At least 1 meter of discharge line is necessary to generate this volume. To help reduce the gas volume immediately after start-up even further, the supply of cooling water to the heat exchanger may be opened before the compressor starts up so as to remove superheat and condense the incoming discharge gas more quickly.

Sump heaters

Low load operation

Sump heaters are strongly recommended on all systems where the compressor is exposed to low ambient temperatures, especially split and remote condenser installations. The sump heater

will minimize refrigerant migration caused by the large temperature gradient between the compressor and the remainder of the system, please refer to section "Accessories".

The compressors should be run for a minimum period in order to ensure that the oil has sufficient time to properly return to the

compressor sumps and that the motor has sufficient time to cool under conditions of lowest refrigerant mass flows.

The use of an electronic expansion valve requires a specific compressor start / stop control.

A specific compressor start sequence control has to be set when an electronic expansion valve (EXV) is used. The sequence must be adjusted according to the EXV step motor speed to allow time for the EXV to open before the compressor starts to avoid running under vacuum conditions.

The EXV should be closed at compressor stop not to let refrigerant in liquid phase entering the

compressor. Ensure that the EXV closes when the supply voltage to the controller is interrupted (ie power cut off) by the use of a battery back up.

Reversible heat pump systems

Transients are likely to occur in reversible heat pump systems, i.e. a changeover cycle from cooling to heating, defrost or low-load short cycles. These transient modes of operation may lead to liquid refrigerant carry-over (or flood back) or excessively wet refrigerant return conditions. As such, reversible cycle applications require specific precautions for ensuring a long compressor life and satisfactory operating characteristics. Regardless of the refrigerant

charge in the system, specific tests for repetitive flood back are required to confirm whether or not a suction accumulator needs to be installed.

The following considerations cover the most important issues when dealing with common applications. Each application design however should be thoroughly tested to ensure acceptable operating characteristics.

26 FRCC.PC.022.A6.02



Discharge line and reversing valve

The Danfoss PSH scroll compressor is a high volumetric machine and, as such, can rapidly build up pressure in the discharge line if gas in the line becomes obstructed even for a very short period of time which situation may occur with slow-acting reversing valves in heat pumps. Discharge pressures exceeding the operating envelope may result in nuisance high-pressure switch cutouts and place excess strain on both the bearings and motor.

To prevent such occurrences, it is important that a 1-meter minimum discharge line length be

allowed between the compressor discharge port and the reversing valve or any other restriction. This gives sufficient free volume for the discharge gas to collect and to reduce the pressure peak during the time it takes for the valve to change position. At the same time, it is important that the selection and sizing of the reversing or 4-way valve ensure that the valve switches quickly enough to prevent against too high discharge pressure and nuisance high-pressure cutouts.

Check with the valve manufacturer for optimal sizing and recommended mounting positions.

In order to limit liquid amount handled per compressor when beginning & ending defrost, one of the defrost, it is recommended to stop compressor before moving the 4 way valve:- First stop compressors- Wait for 10 seconds- Move the 4 way valve- Wait for 2 seconds- Restart the compressors.

The use of a suction line accumulator is strongly recommended in reversible-cycle applications. This because of the possibility of a substantial quantity of liquid refrigerant remaining in the evaporator, which acts as a condenser during the heating cycle.

This liquid refrigerant can then return to the compressor, either flooding the sump with refrigerant or as a dynamic liquid slug when the cycle switches back to a defrost cycle or to normal cooling operations.

Sustained and repeated liquid slugging and flood back can seriously impair the oil’s ability to lubricate the compressor bearings. This situation can be observed in wet climates where it is necessary to frequently defrost the outdoor coil in an air source heat pump. In such cases a suction accumulator becomes mandatory.

Suction line accumulator

Defrost and reverse cycle The Danfoss PSH scroll compressor has the ability to withstand a certain amount of liquid refrigerant dynamic slug. However we advise that

the system is unloaded to the minimum capacity step for defrost or when the cycle is reversed.

Apart from residual moisture in the system after commissioning, water could also enter the refrigeration circuit during operation. Water in the system shall always be avoided. Not only because it can shortly lead to electrical failure, sludge in sump and corrosion but in particular because it can cause serious safety risks.

Common causes for water leaks are corrosion and freezing.

Corrosion: Materials in the system shall be compliant with water and protected against corrosion.

Freezing: When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks. During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 0°C. During on periods ice banking could occur when the circuit is running continuously at too low load. Both situations should be avoided by connecting a pressure and thermostat switch in the safety line.

Water utilizing systems

27FRCC.PC.022.A6.02


Sound and vibration management

During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running. PSH scroll compressors exhibit very little increased start-up transient sound. If a compressor is miswired, the compressor will run in reverse. Reverse

compressor rotation is characterized by an objectionable sound. To correct reverse rotation, disconnect power and switch any two of the three power leads at the unit contactor.

Never switch leads at the compressor terminals.

Starting sound level

Sound power dB(A)

Sound power dB(A)

50Hz 60Hz

PSH019 75 77PSH023 76.5 78.5PSH026 77.5 79PSH030 77.5 79PSH034 79 81PSH039 78 80

Sound Power and attenuation are given at -7/50°C condition.

Running sound level

PSH compressors are equipped with a discharge valve which closes at compressor shut down and thus prevents the compressor from running backwards.

This reduces the stopping sound to a metallic click caused by the closing valve.

When the pressure difference or gas flow at shut down should be very low, this can delay the discharge valve from closing and lead to a longer noise duration.

Compressor acoustic hoods have been developed to meet specific extra-low noise requirements.

Stopping sound level

28 FRCC.PC.022.A6.02


Installation

15 mm

HM 8 bolt

Lock washer

Flat washer


Rubber grommet

Nut

HEAVY

do not liftmanually

Each Danfoss PSH scroll compressor is equipped with two lift rings on the top shell. Always use both these rings when lifting the compressor. Use lifting equipment rated and certified for the weight of the compressor. A spreader bar rated for the weight of the compressor is highly recommended to ensure a better load distribution. The use of lifting hooks closed with a clasp and certified to lift the weight of the compressor is also highly recommended. Always respect the appropriate rules concerning lifting objects of the type and weight of these compressors. Maintain the compressor in an upright position during all handling manoeuvres (maximum of 15° from vertical).Never use only one lifting lug to lift the compressor. The compressor is too heavy for the single lug to handle, and the risk is run that the lug could separate from the compressor with extensive damage and possible personal injury as a result.Store the compressor between -35°C and 50°C, not exposed to rain, corrosive or flammable atmosphere.

When the compressor is mounted as part of an installation, never use the lift rings on the compressor to lift the installation. The risk is run that the lugs could separate from the compressor or that the compressor could separate from the base frame with extensive damage and possible personal injury as a result.Never apply force to the terminal box with the intention of moving the compressor, as the force placed upon the terminal box can cause extensive damage to both the box and the components contained inside.

Compressor handling and storage

Maximum inclination from the vertical plane while operating must not exceed 3 degrees.

Compressors PSH019-039 come delivered with four rubber mounting grommets and metal sleeve liners that serve to isolate the compressor from base frame. These grommets must always be used to mount the compressor in a single application. The grommets must be compressed until contact between the flat washer and the steel mounting sleeve is established. The grommets attenuate to a great extent the transmission of compressor vibrations to the base frame.

The required bolt size for the PSH019-039 compressors is HM8-40. This bolt must be tightened to a torque of 15Nm.

Compressor mounting

Currently PSH019-23-26-30-34-39 are only qualified with even tandem combination. The recommended tandem piping design is similar to even tandem of SH090-105-120-140-161-184. More details about PSH tandem configuration and installation guideline, please refer to SH

parallel Application Guideline FRCC.PC.008. (Note: The model reference relationship between PSH and SH are: PSH019 refer to SH090, PSH023 refer to SH105, PSH026 refer to SH120, PSH030 refer to SH140, PSH034 refer to SH161, PSH039 refer to SH184).

Parallel Installation

29FRCC.PC.022.A6.02


HM8 Tightening torque 15N.M

HM8 Tightening torque 15N.M

Installation

Tightening torque 100N.M

The tandem rail assembly is fixed on the unit frame using rubber grommets supplied with compressor. The Compressors are fixed on the

rails using rigid spacer that included in tandem kits code number 7777053 described below.

Composition of tandem kits code number 7777053

Tandem Kits

Ref Description Qty

Flat washer 4mm 8 Rigid spacer 14mm 8 Rigid spacer 7mm 8 Teflon gasket 2 Adaptor sleeve 1"3/4 - 1"1/8 2

Supplied with the compressor

Included in Tandem kit 7777053

Not supplied

30 FRCC.PC.022.A6.02


The refrigerant compression system, regardless of the type of compressor used, will only provide high efficiency and good reliability, along with a long operating life, if the system contains solely

the refrigerant and oil it was designed for. Any other substances within the system will not improve performance and, in most cases, will be highly detrimental to system operations.

PSH019-23-26-30-34-39 are qualified with even tandem combination use static system to balance the oil level between the compressors.

Each compressor is shipped with a nominal dry nitrogen holding charge between 0.3 and 0.7 bar and is sealed with elastomer plugs. Before the suction and discharge plugs are removed, the nitrogen holding charge must be released via the suction schrader valve to avoid an oil mist blowout. Remove the suction plug first and

the discharge plug afterwards. The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture from entering the compressor. When the plugs are removed, it is essential to keep the compressor in an upright position so as to avoid oil spillage.

Compressor holding charge

System cleanliness

Tandem Configuration

Installation

Tandem configuration Suction Discharge Oil equalization line

Outline drawing number

PSH019+PSH019 1"3/8 1"3/8 1"1/8 5216818P01APSH023+PSH023 1"5/8 1"3/8 1"1/8 5216818P02APSH026+PSH026 1"5/8 1"3/8 1"1/8 5216818P02APSH030+PSH030 1"5/8 1"3/8 1"1/8 5216818P02APSH034+PSH034 1"5/8 1"3/8 1"1/8 5216818P02APSH039+PSH039 1"5/8 1"3/8 1"1/8 5216818P03A

7/8"

Discharge1"3/8

Oil equalisation1"1/8

1"1/8 PSH019 tandem1"1/8 PSH023-039 tandem

Suction1"3/8 PSH019 tandem1"5/8 PSH023-039 tandem

31FRCC.PC.022.A6.02


Installation

The presence of non-condensable substances and system contaminants such as metal shavings, solder and flux, have a negative impact on compressor service life. Many of these contaminants are small enough to pass through a mesh screen and can cause considerable damage within a bearing assembly.

The use of highly hygroscopic polyolester oil in R410A compressors requires that the oil be exposed to the atmosphere as little as possible.

System contamination is one of main factors affecting equipment reliability and compressor service life. It is important therefore to take

system cleanliness into account when assembling a refrigeration system.

During the manufacturing process, circuit contamination may be caused by:• Brazing and welding oxides,• Filings and particles from the removal of burrs in

pipe-work,• Brazing flux,• Moisture and air.

Consequently, when building equipment and assemblies, the precautions listed in the following paragraphs must be taken.

Only use clean and dehydrated refrigeration grade copper tubing. Tube-cutting must be carried out so as not to deform the tubing roundness and to ensure that no foreign debris remains within the tubing. Only refrigerant grade fittings should be used and these must be of

both a design and size to allow for a minimum pressure drop through the completed assembly. Follow the brazing instructions on next pages. Never drill holes into parts of the pipe-work where filings and particles can not be removed.

Tubing

Do not bend the compressor discharge or suction lines or force system piping into the compressor connections, because this will increase

stresses that are a potential cause of failure. Recommended brazing procedures and material, are described section “Compressor connection”.

Brazing and soldering

When brazing copper-to-copper connections, the use of copper/phosphorus brazing alloy containing 5% silver or more with a melting

temperature of below 800°C is recommended. No flux is required during brazing.

Copper to copper Connections

When manipulating dissimilar metals such as copper and brass or steel, the use of silver solder and anti-oxidant flux is necessary.

Dissimilar metals Connection

Compressor connection When brazing the compressor fittings, do not overheat the compressor shell, which could severely damage certain internal components due to excessive heating. Use of a heat shield and/or a heat-absorbent compound is highly recommended. Due to the relatively sizable tubing and fitting diameters a double-tipped torch using acetylene is recommended for brazing operation on PSH compressors.

For soldering the injection valve connections, wet rag and/or running water is recommend to keep the valve body cool (not exceed 120°C) during brazing. The inside of motor, however should keep it dry.

For brazing the suction and discharge connections, the following procedure is advised:• Make sure that no electrical wiring is connected to the compressor.• Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram).• Remove the Teflon gaskets when brazing rotolock connectors with solder sleeves.• Use only clean refrigeration-grade copper tubing and clean all connections.• Use brazing material with a minimum of 5% silver content.• Purge nitrogen or CO2 through the compressor in order to prevent against oxidation and flammable conditions. The compressor should not be exposed to the open air for extended periods.• Use of a double-tipped torch is recommended.

32 FRCC.PC.022.A6.02


Installation

Heat shield

C B A

Leak detection must be carried out using a mixture of nitrogen and refrigerant or nitrogen and helium, as indicated in the table below. Never use other gasses such as oxygen, dry air

or acetylene as these may form an inflammable mixture.Pressurize the system on HP side first then LP side.

• Apply heat evenly to area A until the brazing temperature is reached. Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well, and then begin adding the brazing material. Move the torch evenly around the joint, in applying only enough brazing material to flow the full circumference of the joint.• Move the torch to area C only long enough to draw the brazing material into the joint, but not into the compressor.• Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth. Remaining flux would cause corrosion of the tubing.

Ensure that no flux is allowed to enter into the tubing or compressor. Flux is acidic and can cause substantial damage to the internal parts of the system and compressor.

The polyolester oil used in PSH compressors is highly hygroscopic and will rapidly absorb moisture from the air. The compressor must therefore not be left open to the atmosphere for a long period of time. The compressor fitting plugs shall be removed just before brazing the compressor. The compressor should always be

the last component brazed into the system.

Before eventual unbrazing the compressor or any system component, the refrigerant charge must be removed from both the high- and low pressure sides. Failure to do so may result in serious personal injury. Pressure gauges must be used to ensure all pressures are at atmospheric level.

For more detailed information on the appropriate materials required for brazing or soldering, please contact the product manufacturer or distributor.

For specific applications not covered herein, please contact Danfoss for further information.

Always use an inert gas such as nitrogen for pressure testing. Never use other gasses such as oxygen, dry air or acetylene as these may form an inflammable mixture.

Do not exceed the following pressures:• Maximum compressor test pressure (low

side): 33.3 bar (g)• Maximum compressor test pressure (high

side): 48.7 bar (g)• Maximum pressure difference between high

& low side of the compressor: 35 bar

Pressurize the system on HP side first then LP side to prevent rotation of the scroll. Never let the pressure on LP side exceed the pressure on HP side with more than 5 bar.

On PSH019-023-026-030-034-039 models which have an internal non return valve in discharge fitting or if an external non return valve is present on the discharge line, we advise to pressurize the system not quicker than 4.8 bar/s to allow pressure equalization between LP and HP side over scroll elements.

System pressure test

Leak detection

Leak detection with refrigerant Leak detection with a mass spectrometer

Nitrogen & R410A Nitrogen & Helium

Note 1: Leak detection with refrigerant may be forbidden in some countries. Check local regulations.Note 2: The use of leak detecting additives is forbidden as they may affect the lubricant properties.

33FRCC.PC.022.A6.02


Installation

Moisture obstructs the proper functioning of the compressor and the refrigeration system. Air and moisture reduce service life and increase condensing pressure, and cause excessively high discharge temperatures, which can destroy the lubricating properties of the oil. Air and moisture also increase the risk of acid formation, giving rise to copper platting. All these phenomena can cause mechanical and electrical compressor failure.

For these reasons it’s important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly; PSH compressors are delivered with

<100 ppm moisture level. The required moisture level in the circuit after vacuum dehydration must be <100 ppm for systems with a PSH.

• Never use the compressor to evacuate the system.

• Connect a vacuum pump to both the LP & HP sides.

• Evacuate the system to a pressure of 500 μm Hg (0.67 mbar) absolute.

Do not use a megohm meter nor apply power to the compressor while it’s under vacuum as this may cause internal damage.

Vacuum evacuation and moisture removal

A properly sized & type of drier is required. Important selection criteria include the driers water content capacity, the system refrigeration capacity and the system refrigerant charge. The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD).

For new installations with PSH compressors with polyolester oil, Danfoss recommends using the Danfoss DML (100% molecular sieve) solid core filter drier. Molecular sieve filter driers with loose beads from third party suppliers shall be avoided. For servicing of existing installations where acid formation is present the Danfoss DCL (solid core) filter driers containing activated alumina are recommended.

The drier is to be oversized rather than under sized. When selecting a drier, always take into account its capacity (water content capacity), the system refrigeration capacity and the system refrigerant charge.

After burn out, remove & replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity. Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line.

It is recommended to assemble filter drier before liquid injection pipe in order to avoid debris blocking liquid injection valve.

Filter driers

For the initial charge the compressor must not run and eventual service valves must be closed. Charge refrigerant as close as possible to the nominal system charge before starting the compressor.

This initial charging operation must be done in liquid phase. The best location is on the liquid line between the condenser outlet and the filter drier. Then during commissioning, when needed, a complement of charge can be done in liquid phase: slowly throttling liquid in on the low pressure side as far away as possible from the compressor suction connection while compressor is running. The refrigerant charge quantity must be suitable for both summer and winter operations.

Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor. When servicing, always ensure that LP/HP pressures are balanced before starting the compressor.

Be sure to follow all government regulations regarding refrigerant reclamation and storage.

For more detailed information see “Recommended refrigerant system charging practice” news bulletin FRCC.EN.050.

Refrigerant charging

34 FRCC.PC.022.A6.02


Installation

Danfoss PSH compressors can tolerate liquid refrigerant up to a certain extend without major problems. However, excessive liquid refrigerant in the compressor is always unfavourable for service life. Besides, the installation cooling capacity may be reduced because of the evaporation taking place in the compressor and/or the suction line

instead of the evaporator. System design must be such that the amount of liquid refrigerant in the compressor is limited.

Refrigerant charge limit

Insulation resistance on motor pins and thermistor connections must be higher than 1 megohm when measured with a 500 volt direct current megohm tester. Never perform insulation resistance test on control board power leads.

Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration. Leakage current is less than 5 mA.

It is not recommended to repeat high voltage test (hi-pot) on motor. If this test must be carried out anyway, it is mandatory to disconnect the control board to prevent any damages or destruction.

PSH scroll compressors are configured with the pump assembly at the top of the shell, and the motor below. As a result, the motor

can be partially immersed in refrigerant and oil. The presence of refrigerant around the motor windings will result in lower resistance values to ground and higher leakage current readings. Such readings do not indicate a faulty compressor.

In testing insulation resistance, Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system.

Following this brief operation, retest the compressor for insulation resistance or current leakage.

Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground). Be alert for sounds of arcing inside the compressor.

Model Refrigerant charge limit in the compressor (kg)

PSH019 5.9

PSH023-026-030-034-039 7.9

Insulation resistance and dielectric strength

The system must be monitored after initial start-up for a minimum of 60 minutes to ensure proper operating characteristics such as:

• Proper metering device operation and desired superheat readings

• Suction and discharge pressure are within acceptable levels

• Correct oil level in compressor sump indicating proper oil return

• Low foaming in sight glass and compressor

sump temperature 10K above saturation temperature to show that there is no refrigerant migration taking place

• Acceptable cycling rate of compressors, including duration of run times

• Current draw of individual compressors within acceptable values (max operating current)

• No abnormal vibrations and noise.

Commissioning

In installations with good oil return and line runs up to 20 m, no additional oil is required. If installation lines exceed 20 m, additional oil may be needed. 1 or 2% of the total system refrigerant charge (in weight) can be used to roughly define the required oil top-up quantity but in any case the oil charge has to be adjusted based on the oil level in the compressor sight glass.

When the compressor is running under stabilized conditions the oil level must be visible in the sight glass.

The presence of foam filling in the sight glass indicates large concentration of refrigerant in the oil and / or presence of liquid returning to the compressor.

The oil level can also be checked a few minutes after the compressor stops. When the compressor is off, the level in the sight glass can be influenced by the presence of refrigerant in the oil.

Always use original Danfoss POE oil 160SZ from new cans.

Top-up the oil while the compressor is idle. Use the schrader connector or any other accessible connector on the compressor suction line and a suitable pump. See News bulletin “Lubricants filling in instructions for Danfoss Commercial Compressors”.

Oil level checking and top-up

35FRCC.PC.022.A6.02


Ordering information and packaging

Packaging

Single pack

Industrial pack

Compressor model Nb * Length (mm) Width (mm) Height (mm) Gross weight (kg ) Static stacking

pallets

PSH019 6 / 8 1150 950 680 386 2

PSH023 6 / 8 1150 950 750 424 2

PSH026 6 / 8 1150 950 750 424 2

PSH030 6 / 8 1150 950 750 440 2

PSH034 6 / 8 1150 950 750 452 2

PSH039 6 / 8 1150 950 750 470 2

* Nbr: number of compressor per pack: Full package version: Bare compressor version

Compressor model Length (mm) Width (mm) Height (mm) Gross weight (kg)

PSH019 565 470 718 69

PSH023 565 470 718 76

PSH026 565 470 718 76

PSH030 565 470 718 79

PSH034 565 470 718 81

PSH039 565 470 718 84

36 FRCC.PC.022.A6.02


Ordering information and packaging

Ordering information

Industrial pack

Single pack

Danfoss PSH scroll compressors can be ordered in either industrial or single packs. Please use the

code numbers from below tables for ordering:

Compressor model ConnectionsCode number

Motor code 3 Motor code 4 Motor code 9PSH019

Full package

120H0963 120H0931 120H0987PSH023 120H0965 120H0933 120H0989PSH026 120H0967 120H0935 120H0991PSH030 120H0969 120H0937 120H0993PSH034 120H0971 120H0939 120H0995PSH039 120H0973 120H0941 120H0997PSH019

Bare compressor

120H0951PSH023 120H0953PSH026 120H0955PSH030 120H0957PSH034 120H0959PSH039 120H0961

Compressor Model ConnectionsCode number

Motor code 3 Motor code 4 Motor code 9PSH019

Full package

120H0964 120H0932 120H0988PSH023 120H0966 120H0934 120H0990PSH026 120H0968 120H0936 120H0992PSH030 120H0970 120H0938 120H0994PSH034 120H0972 120H0940 120H0996PSH039 120H0974 120H0942 120H0998PSH019

Bare compressor

120H0952PSH023 120H0954PSH026 120H0956PSH030 120H0958PSH034 120H0960PSH039 120H0962

37FRCC.PC.022.A6.02


Accessories

Solder sleeve

Solder sleeve adapter sets

Rotolock adapter

Gaskets

Type Code n° Description Application Packaging Pack size

120Z0125 Rotolock adaptor set (1"3/4 ~ 1"1/8) , (1"1/4 ~ 7/8") PSH019 Multipack 8

120Z0405 Rotolock adaptor set (1"3/4 ~ 1"3/8) , (1"1/4 ~ 7/8") PSH023 to 039 Multipack 8

7765006 * Rotolock adaptor set (1"3/4 ~ 1"3/8) , (1"1/4 ~ 7/8") PSH023 to 039 Multipack 6* diameter restriction


120Z0367 Adaptor (1"1/4 Rotolock - 7/8" ODS) Models with 7/8” ODF Multipack 10

120Z0364 Adaptor (1"3/4 Rotolock - 1"1/8 ODS) Models with 1"1/8 ODF Multipack 10

120Z0431 Adaptor (1"3/4 Rotolock - 1"3/8 ODS) Models with 1"3/8 ODF Multipack 10


P02 8153004 Solder sleeve P02 (1"3/4 Rotolock - 1"1/8 ODF) Models with 1"3/4 rotolock connection Multipack 10

P02 7953005 Solder sleeve P02 (1"3/4 Rotolock - 1"1/8 ODF) Models with 1"3/4 rotolock connection Industry pack 50

P04 8153008 Solder sleeve P04 (1"1/4 Rotolock - 3/4" ODF) Models with 1"1/4 rotolock connection Multipack 10

P04 7953007 Solder sleeve P04 (1"1/4 Rotolock - 3/4" ODF) Models with 1"1/4 rotolock connection Industry pack 50

P05 8153012 Rotolock connector P05 (1"1/4 Rotolock - 7/8" ODF) Models with 1"1/4 rotolock connection Multipack 10

P05 7953008 Rotolock connector P05 (1"1/4 Rotolock - 7/8" ODF) Models with 1"1/4 rotolock connection Industry pack 50

P07 8153013 Solder sleeve P07 (1"3/4 Rotolock - 7/8" ODF) Models with 1"3/4 rotolock connection Multipack 10

P07 7953010 Solder sleeve P07 (1"3/4 Rotolock - 7/8" ODF) Models with 1"3/4 rotolock connection Industry pack 50

P10 8153003 Solder sleeve P10 (1"3/4 Rotolock - 1"3/8 ODF) Models with 1"3/4 rotolock connection Multipack 10


G09 8156131 Gasket, 1"1/4 Models with 1"1/4 rotolock connection Multipack 10

G09 7956002 Gasket, 1"1/4 Models with 1"1/4 rotolock connection Industry pack 50

G07 8156132 Gasket, 1"3/4 Models with 1"3/4 rotolock connection Multipack 10

G07 7956003 Gasket, 1"3/4 Models with 1"3/4 rotolock connection Industry pack 50

Rotolock nut


8153123 Rotolock nut,1"1/4 Models with 1-1/4” rotolock connection Multipack 10

7953002 Rotolock nut,1"1/4 Models with 1-1/4” rotolock connection Industry pack 50

8153124 Rotolock nut,1"3/4 Models with 1-3/4” rotolock connection Multipack 10

7953003 Rotolock nut,1"3/4 Models with 1-3/4” rotolock connection Industry pack 50

38 FRCC.PC.022.A6.02


Accessories

Rotolock service valve set

3-phase soft start equipment


MCI 15 C 7705006 Electronic soft start kit, MCI 15 C PSH019 Single pack 1

MCI 25 C 7705007 Electronic soft start kit, MCI 25 C PSH023 to 039 Single pack 1


7703008 Valve set, V02 (1"3/4 ~ 1"1/8), V05 (1"1/4 ~ 7/8") PSH019 Multipack 6

120Z0403 Valve set, V02 (1"3/4 ~ 1"1/8), V05 (1"1/4 ~ 7/8") PSH019 Multipack 8

7703392 Valve set, V10 (1"3/4 ~1"3/8), V05 (1"1/4 ~ 7/8") PSH023 to 039 Multipack 6

* diameter restriction

Surface sump heaters

Terminal boxes, covers & control boards

Sensors & cables

Code no. Accessory description Application Packaging Pack size

120Z0388 80W 24V surface sump heater CE & UL

PSH019 to 039

Multipack 8

120Z0389 80W 230V surface sump heater CE & UL Multipack 8





120Z0530 Control board PSH019 to PSH039

Type Code n° Description Application Packaging Packsize

120Z0534 Discharge temperature sensor PT1000 PSH019 to PSH039 single pack 1

39FRCC.PC.022.A6.02


Accessories

Mounting hardware

Tandem kits

Communication tool

Type Code No Description Application Packaging Pack Size

120Z0066Mounting kit for scroll compressors. Grommets, sleeves, bolts, washers

PSH019 to 039 Single pack 1

Lubricant

Miscellaneous


160SZ 7754023 POE lubricant, 1 litre can All models Single pack 1

160SZ 7754024 POE lubricant, 2 litre can All models Single pack 1


8156019 Sight glass with gaskets (black & white) All models Multipack 4

8156129 Gasket for oil sight glass, 1"1/8 (white teflon) All models Multipack 10

7956005 Gasket for oil sight glass, 1"1/8 (white teflon) All models Multipack 50

8154001 Danfoss Commercial Compressors blue spray paint All models Single pack 1


120Z0480 MMIMYK PSH019 to PSH039 single pack 1

120Z0481 MMIGRS PSH019 to PSH039 single pack 1

120Z0498 RJ11 cable PSH019 to PSH039 single pack 1


7777044 Suction washer,rigid spacer, sleeve for oil connection Even tandem single pack 1

40 FRCC.PC.022.A6.02


Previous Version Current Version

• Page 12: Electrical data

• Page 16: Pressure equipment directive 97/23/EC, Low voltage directive 2006/95/EC

• Page 18: Application envelope: A suction superheat below 5K is not allowed

• Discharge temperature protection• Page 19: Liquid Injection: A minimum 5K

subcooling is necessary to ensure correct liquid injection

• Page 20: The Liquid Injection Valve (LIV) is a UKV stepper valve

• Page 25: Low ambient operations• Page 35: Insulation resistance and dielectric

strength: Leakage current is less than 0.5mA

• Page 12: Updated PSH023, 026 in Motor code 3 & PSH023 in Motor code 9 under Electrical data.

• Page 16: Pressure equipment directive 2014/68/EU, Low voltage directive 2014/35/EU

• Page 18: Application envelope: A suction superheat below 4K is not allowed

• Updated Discharge temperature protection• Page 19: Liquid Injection: A minimum 4K

subcooling is necessary to ensure correct liquid injection

• Page 20: The Liquid Injection Valve (LIV) is a ETS6 stepper valve

• Page 25: Updated Low ambient operations• Page 35: Insulation resistance and dielectric

strength: Leakage current is less than 5mA

Updates

41FRCC.PC.022.A6.02


Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications. With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs.

We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business, and positioned us as distinct variable speed technology specialists. Today we operate from engineering and manufacturing facilities spanning across three continents.

FRCC.PC.022.A6.02 © Danfoss | DCS (CC) | 2016.07

Our products can be found in a variety of applications such as rooftops, chillers, residential air conditioners, heatpumps, coldrooms, supermarkets, milk tank cooling and industrial cooling processes.

http://cc.danfoss.com

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