TECHNICAL MANUAL for 550 SERIES CONDENSING UNITS … · TECHNICAL MANUAL for 550 SERIES CONDENSING...

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TECHNICAL MANUAL

for 550 SERIES CONDENSING UNITS

and 542 SERIES DUCTED CONDENSING UNITS

from IMI AIR CONDITIONING LTD

This manual provides technical and installation information for 550 series condensing units and 542 series ductedcondensing units.

INDEX PAGE

GENERAL Specification details 2Features and options 3Part numbers 3Dimensions and weights 4

SELECTION MCU / MCU+ performance data 5DCUE performance data 6

INSTALLATION MCU / MCU+ 550 series 7DCUE 542 series 9Application, pipe sizing 11Pipe connections 12Electrical connections 12Evacuating and charging 13

WIRING MCU 14DIAGRAMS MCU+ 15

DCUE 16

KITS PTC: 1 phase units 17CSR: 1 phase MCU / MCU+ 550 series 18CSR: 1 phase DCUE 542 series 19Head pressure control - 550 series MCU only 20Compressor jacket: MCU / MCU+ 550 series 22HP pressure switches MCU / MCU+ 23Isolator: DCUE 542 series 253 minute timer: 550 series MCU only 27Wall mounting MCU / MCU+ 550 series 28Wall mounting: DCUE 542 series 30Overload: MCU / MCU+ 1 phase 550 series 31Overload: DCUE 1 phase 542 series 32Volt free relay 33Duct: DCUE 542 series 34Plenum: DCUE 542 series 34Grille: DCUE 542 series 36

COMPONENT Exploded views of units with 37IDENTIFICATION component identification

IMI Air Conditioning Ltd.Armytage Road, Brighouse,West Yorkshire. HD6 1QFTel: (01484) 405600Fax: (01484) 405620 A subsidiary company of IMI plc

55008275-03

Heronhill - for all your IMI requirements

Tel: 01823 665660 www.heronhill.co.uk Fax: 01823 665807

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IMI AIR CONDITIONING LIMITED - CONDENSING UNITS

SPECIFICATION DETAILS

MCU(+) SIZE 15 20 30 40 50 60 80 90 100 130 150 165 180 200Nominal cooling capacity ¶ kW 2.5 2.8 3.7 4.2 5.8 7.0 7.4 8.2 10.9 12.4 13.9 14.7 17.1 19.9R22 Compressor - 1 Ph (230V 50Hz)Power (nominal) kW 0.7 1.0 1.2 1.4 1.9 2.3 2.9 4.0 - - - - - -Starting current LRA A 21 24 32 32 58 61 76 114 - - - - - -Nominal current FLA A 4.1 5.2 5.9 7 8.5 9.9 11 16.2 - - - - - -R22 Compressor - 3 Ph (400V 50Hz) Power (nominal) kW - - 1.6 2.0 1.9 2.3 2.8 4.0 4.0 4.3 5.2 5.8 6.8 8.9Starting current LRA A/Ph - - 18 22 26 32 40 48 51 62 68 71 71 98Nominal current FLA A/Ph - - 3.9 5.1 4.0 4.1 4.5 7.0 7.1 7.6 8.6 9.5 11.6 16.1R22 charge supplied g 630 980 950 1180 1610 1900 1800 1960 2400 3970 3970 4320 4420 5220

Operating weight kg 1 Ph 45 (39*) 46 (40*) 48 (41*) 53 (45*) 64 65 66 76 - - - - - -3 Ph - - 48 53 62 63 64 73 81 101 103 103 118 173

*Obsolete units fitted with a rotary compressorR407C Compressor - 1 Ph (230V 50Hz)Power (nominal) kW 1.1 1.6 1.6 2.1 2.0 2.4 3.0 4.2 - - - - - -Starting current LRA A 23 28 36 50 58 61 76 114 - - - - - -Nominal current FLA A 5.9 6.9 8.1 10.2 8.9 9.8 11.5 16.9 - - - - - -R407C Compressor - 3 Ph (400V 50Hz) Power (nominal) kW - - 1.6 2.0 1.9 2.4 3.0 4.1 4.3 4.4 5.3 6.0 7.0 9.4Starting current LRA A/Ph - - 18 22 26 32 40 48 51 62 68 71 71 98Nominal current FLA A/Ph - - 3.6 4.8 4.2 4.2 4.9 7.1 7.2 7.7 8.7 9.5 11.9 16.9R407C charge supplied g 660 1030 1000 1240 1690 2000 1880 2060 2520 4170 4170 4540 4640 5480

Operating weight kg 1 Ph 45 46 48 53 64 65 66 76 - - - - - -3 Ph - - 48 53 62 63 64 73 81 101 103 103 118 173

Connection sizesSuction ins odf 3/8 3/8 1/2 1/2 1/2 5/8 5/8 5/8 3/4 3/4 3/4 3/4 7/8 7/8Liquid ins odf 3/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2

Sound Pressure Levels (SPL) at 3m distance in free field conditions. (Reference 2 x 10-5 N/m²)

Fan speed min dBA 45 46 47 50 51 51 51 53 54 56 56 57 56 56NC 40 41 42 47 47 46 45 47 48 49 49 51 50 50

Fan speed max dBA 50 50 51 53 54 54 58 56 60 60 56 60 61 61NC 46 47 48 50 50 50 56 53 56 54 49 55 60 60

MCU(+) SIZE 15 20 30 40 50 60 80 90 100 130 150 165 180 200

Condenser fan (1Ph 230V 50Hz)Airflow (max speed) m³/s 0.813 0.813 0.813 0.723 0.783 0.783 0.783 1.140 1.140 1.740 1.740 1.740 2.407 2.407Fan motor rating kW 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.24 0.24 2 x 0.13 2 x 0.13 2 x 0.13 2 x 0.24 2 x 0.24Nominal current FLA A 0.6 0.6 0.6 0.6 0.6 0.6 0.6 1.0 1.0 2 x 0.60 2 x 0.60 2 x 0.60 2 x 1.00 2 x 1.00Fans:- No. x diameter # x mm 1 x 457 1 x 457 1 x 457 1 x 457 1 x 457 1 x 457 1 x 457 1 x 508 2 x 457 2 x 457 2 457 2 x 457 2 x 508 2 x 508Fans:- max speed r.p.m. 760 760 760 760 910 910 910 950 950 910 910 910 950 950

DCUE SIZE 10 (Obs) 15 20 30 40 50 60 80Nominal cooling capacity ¶ kW 2.0 2.6 2.8 3.7 4.6 5.8 6.3 6.9

Compressor - 1 Ph (230V 50Hz)Power (nominal) kW 0.75 1.00 1.16 1.46 1.87 2.20 2.56 2.95Starting current LRA A 16 23 28 36 50 51 60 71Nominal current FLA A 3.4 5.2 5.9 7.2 9.3 10.0 12.0 14.1Compressor - 3 Ph (400V 50Hz) Power (nominal) kW - - - 1.45 1.90 2.12 2.52 2.80Starting current LRA A/Ph - - - 18 22 24 24 27Nominal current FLA A/Ph - - - 2.7 3.9 4.0 4.2 4.8Crankcase heater A 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25R22 charge supplied g 540 570 880 930 990 1250 1140 1400R407C charge supplied g 570 600 930 990 1050 1240 1190 1480

Connection sizesSuction ins odf 3/8 3/8 3/8 1/2 1/2 1/2 5/8 5/8Liquid ins odf 3/8 3/8 3/8 3/8 3/8 3/8 3/8 1/2

DCUE SIZE 10 (Obs) 15 20 30 40 50 60 80

Condenser fan (1 Ph 230V 50Hz)Airflow (max speed) m³/s 0.44 0.44 0.44 0.42 0.38 0.53 0.53 0.48Max external resistance Pa 100 100 100 100 100 100 100 100Fan motor rating kW 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34Starting current A 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0Nominal current FLA A 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6Operating weight kg 66 69 70 70 72 81 81 84

Sound Pressure Levels (SPL) at 3m distance from unit in ceiling void. (Reference 2 x 10-5 N/m²)

Fan speed min dBA 35 35 35 35 35 44 44 44NC 28 28 28 28 28 31 31 31

Fan speed max dBA 52 52 52 52 52 54 54 54NC 46 46 46 46 46 48 48 48

¶ Nominal capacities quoted at 7.5�C saturated suction temperature and 35�C air onto the condenser.



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STANDARD FEATURES AND OPTIONSMCU = standard condensing unit MCU+ = standard condensing unit + head pressure control + low pressure switch

DCUE = electronic controlled ducted condensing unit + head pressure control + HP and LP switches

CONDENSING UNIT MODEL MCU MCU+ DCUEEasy access for installation and serviceSuction and liquid service valves Expansion device (orifice type)Pre-charged with refrigerant (R22 or R407C)Heat pump version availableDucted air inlet and/or discharge -- --Ceiling suspendable -- --Capacitor start relay (1phase) (MCU(+) 15 - 40, ALL DCUE) * * *PTC resistor (1 phase) * * *Head pressure control *LP cut-out *HP cut-out auto (DCUE has manual backup) *Isolator * * *3 minute start time delay *Wall mounting brackets * * *ContactorOverload (standard on 3ph) * -- *Low ambient start -- --

= Standard Feature, * = Option

PART NUMBERS

MCU/MCU+ CONDENSING UNITS

MCU 1PhRotary (Obs) MCU 15 MCU 20 MCU 30 MCU 40 MCU 1Ph

Recip MCU 15 MCU 20 MCU 30 MCU 40

R407C -- -- -- -- R407C 55022045 55022046 55022047 55022048R22 55099066 55099067 55099068 55099069 R22 55022151 55022152 55022153 55022154

MCU 1PhScroll MCU 50 MCU 60 MCU 80 MCU 90 MCU 3Ph

Recip MCU 30 MCU 40

R407C 55099049 55099050 55099051 55099052 R407C 55022053 55022054R22 55022070 55022071 55022072 55022073 R22 55022074 55022075

MCU 3PhScroll MCU 50 MCU 60 MCU 80 MCU 90 MCU 100 MCU 130 MCU 150 MCU 165 MCU 180 MCU 200

R407C 55022055 55022056 55022057 55022058 55022059 55022060 55022061 55022062 55022063 55022064R22 55022076 55022077 55022078 55022079 55022080 55022081 55022082 55022083 55022084 55022085

MCU+ 1PhRotary (Obs) MCU+ 15 MCU+ 20 MCU+ 30 MCU+ 40 MCU+ 1Ph

Recip MCU+ 15 MCU+ 20 MCU+ 30 MCU+ 40

R407C -- -- -- -- R407C 55022002 55022003 55022004 55022005R22 55099024 55099025 55099026 55099027 R22 55022155 55022156 55022157 55022158

MCU+ 1PhScroll MCU+ 50 MCU+ 60 MCU+ 80 MCU+ 90 MCU+ 3Ph

Recip MCU+ 30 MCU+ 40

R407C 55022006 55022007 55022008 55022009 R407C 55022011 55022012R22 55022028 55022029 55022030 55022031 R22 55022032 55022033

MCU+ 3PhScroll MCU+ 50 MCU+ 60 MCU+ 80 MCU+ 90 MCU+ 100 MCU+ 130 MCU+ 150 MCU+ 165 MCU+ 180 MCU+ 200

R407C 55022013 55022014 55022015 55022016 55022017 55022018 55022019 55022020 55022021 55022022R22 55022034 55022035 55022036 55022037 55022038 55022039 55022040 55022041 55022042 55022043

Part numbers shown in underlined italics eg 55099066 are obsolete models, shown in this manual for reference only

DCUE DUCTED CONDENSING UNITS (542 Series, reciprocating compressors)

Electronic DCUE DCUE 10 (Obs) DCUE 15 DCUE 20 DCUE 30 DCUE 40 DCUE 50 DCUE 60 DCUE 80R22 54200001 542000 542000 542000 542000 542000 542000 542000

R407C 54200026 542000 542000 542000 542000 542000 542000 542000

Electronic DCUE 3Ph -- -- -- DCUE 30 DCUE 40 DCUE 50 DCUE 60 DCUE 80R22 -- -- -- 542000 542000 542000 542000 542000

R407C -- -- -- 542000 542000 542000 542000 542000



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UNPACKED DIMENSIONS and WEIGHTS

MCU / MCU+ CONDENSING UNITSModel 15 20 30 40 50 60 80 90 100 130 150 165 180 200HEIGHT mm 620 620 620 620 720 720 720 820 820 1080 1080 1080 1275 1275WIDTH mm 900 900 900 900 1000 1000 1000 1000 1000 1000 1000 1000 1100 1100DEPTH mm 300 300 300 300 300 300 300 350 350 425 425 425 425 4251 Ph kg 45 (39*) 46 (40*) 48 (41*) 53 (45*) 64 65 66 76 - - - - - -3 Ph kg - - 48 53 62 63 64 73 81 101 103 103 118 173

* Obsolete R407C Models and R22 models fitted with a rotary compressor

DCUE DUCTED CONDENSING UNITS

Model DCUE 10 (Obs) DCUE 15 DCUE 20 DCUE 30 DCUE 40 DCUE 50 DCUE 60 DCUE 80HEIGHT mm 560 560 560 560 560 625 625 625WIDTH mm 1075 1075 1075 1075 1075 1245 1245 1245DEPTH mm 565 565 565 565 565 565 565 565WEIGHT kg 66 69 70 70 72 81 81 84

PACKED DIMENSIONS and WEIGHTS

MCU / MCU+ CONDENSING UNITSModel 15 20 30 40 50 60 80 90 100 130 150 165 180 200HEIGHT mm 620 620 620 620 720 720 720 820 820 1080 1080 1080 1280 1280WIDTH mm 980 980 980 980 1080 1080 1080 1090 1090 1090 1090 1090 1215 1215DEPTH mm 340 340 340 340 340 340 340 390 390 465 465 465 465 4651 Ph kg 47 (41*) 48 (42*) 50 (43*) 55 (47*) 66 67 68 78 - - - - - -3 Ph kg - - 50 55 64 65 66 75 83 105 107 107 123 178

* Obsolete R407C Models and R22 models fitted with a rotary compressor

DCUE DUCTED CONDENSING UNITS

Model DCUE 10 (Obs) DCUE 15 DCUE 20 DCUE 30 DCUE 40 DCUE 50 DCUE 60 DCUE 80HEIGHT mm 580 580 580 580 580 650 650 650WIDTH mm 1090 1090 1090 1090 1090 1270 1270 1270DEPTH mm 610 610 610 610 610 610 610 610WEIGHT kg 71 74 75 76 76 86 86 90



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MCU(+) 15 - 200 CONDENSING UNIT CAPACITIES

MODELAir on to

Condenser�C

Saturated Suction Temperature �C-2.5 0 2.5 5 7.5 10

Cooling capacity and power input kWCap. Power Cap. Power Cap. Power Cap. Power Cap. Power Cap. Power

MCU(+) 15

25 1.93 0.69 2.14 0.70 2.35 0.70 2.55 0.71 2.76 0.72 2.96 0.7230 1.81 0.74 2.01 0.75 2.21 0.76 2.41 0.77 2.61 0.78 2.81 0.7935 1.69 0.79 1.89 0.80 2.08 0.81 2.27 0.83 2.46 0.84 2.65 0.8640 1.58 0.84 1.76 0.86 1.95 0.88 2.13 0.90 2.32 0.91 2.50 0.9345 1.46 0.90 1.64 0.92 1.82 0.94 2.00 0.97 2.18 0.99 2.36 1.01

MCU(+) 20

25 2.25 0.80 2.49 0.81 2.71 0.81 2.96 0.82 3.22 0.84 3.49 0.8530 2.08 0.84 2.31 0.86 2.54 0.87 2.78 0.89 3.01 0.90 3.26 0.9235 1.94 0.90 2.16 0.92 2.38 0.93 2.61 0.95 2.84 0.97 3.05 0.9840 1.83 0.98 2.04 0.99 2.25 1.01 2.46 1.03 2.66 1.05 2.86 1.0645 1.73 1.07 1.92 1.08 2.11 1.09 2.30 1.11 2.49 1.13 2.68 1.15

MCU(+) 30

25 2.87 1.02 3.22 1.05 3.53 1.06 3.74 1.04 4.12 1.07 4.49 1.1030 2.71 1.10 3.06 1.13 3.27 1.12 3.51 1.12 3.84 1.15 4.19 1.1835 2.59 1.20 2.82 1.20 3.03 1.19 3.36 1.23 3.68 1.26 3.79 1.2240 2.38 1.27 2.71 1.32 2.80 1.26 3.12 1.31 3.32 1.31 3.62 1.3545 2.11 1.30 2.43 1.36 2.53 1.31 2.84 1.37

MCU(+) 40

25 3.38 1.13 3.70 1.15 4.02 1.16 4.35 1.18 4.67 1.19 5.00 1.2130 3.19 1.22 3.50 1.24 3.81 1.26 4.11 1.28 4.42 1.30 4.73 1.3235 3.01 1.31 3.30 1.33 3.59 1.36 3.88 1.38 4.17 1.41 4.46 1.4340 2.84 1.40 3.11 1.43 3.37 1.47 3.63 1.50 3.89 1.53 4.15 1.5645 2.68 1.51 2.91 1.55 3.15 1.58 3.38 1.62 3.61 1.66 3.85 1.70

MCU(+) 50

25 4.57 1.87 5.09 2.03 5.51 2.14 5.97 2.25 6.41 2.38 6.79 2.5130 4.34 1.95 4.75 2.09 5.25 2.19 5.63 2.32 6.04 2.45 6.49 2.5835 3.94 2.00 4.42 2.13 4.91 2.24 5.29 2.36 5.75 2.49 6.09 2.6540 3.76 2.05 4.22 2.18 4.58 2.29 5.04 2.41 5.39 2.58 5.69 2.7445 3.50 2.12 3.93 2.22 4.37 2.35 4.69 2.48

MCU(+) 60

25 5.43 2.22 6.02 2.27 6.61 2.31 7.21 2.37 7.80 2.42 8.39 2.4730 5.06 2.46 5.64 2.51 6.22 2.56 6.80 2.62 7.39 2.67 7.97 2.7335 4.77 2.72 5.33 2.78 5.89 2.83 6.45 2.89 7.01 2.95 7.57 3.0140 4.39 3.01 4.91 3.07 5.43 3.13 5.95 3.19 6.47 3.26 6.99 3.3245 4.02 3.32 4.49 3.40 4.97 3.46 5.45 3.53 5.93 3.60

MCU(+) 80

25 6.07 2.26 6.64 2.31 7.21 2.37 7.79 2.42 8.36 2.47 8.93 2.5330 5.68 2.49 6.23 2.54 6.77 2.60 7.32 2.66 7.87 2.71 8.42 2.7735 5.28 2.72 5.81 2.78 6.33 2.83 6.86 2.89 7.38 2.95 7.91 3.0140 4.90 3.03 5.39 3.10 5.88 3.16 6.37 3.23 6.86 3.29 7.35 3.3645 4.52 3.35 4.97 3.42 5.43 3.49 5.88 3.56 6.33 3.63

MCU(+) 90

25 7.16 2.89 7.71 2.95 8.26 3.01 8.81 3.06 9.36 3.12 9.91 3.1830 6.69 3.17 7.21 3.24 7.74 3.30 8.27 3.36 8.79 3.42 9.32 3.4835 6.22 3.46 6.72 3.52 7.22 3.59 7.72 3.65 8.23 3.72 8.73 3.7840 5.80 3.79 6.27 3.86 6.74 3.93 7.22 4.00 7.69 4.07 8.17 4.1445 5.38 4.12 5.82 4.20 6.27 4.27 6.71 4.34 7.16 4.42 7.60 4.49

MCU(+) 100

25 7.87 3.18 9.10 3.42 10.40 3.66 11.52 3.87 12.61 3.87 13.83 3.8630 7.60 3.23 8.73 3.88 9.68 3.81 10.71 4.05 11.66 4.18 12.71 4.2935 7.00 3.24 8.06 3.56 9.03 3.87 9.92 4.13 10.91 4.31 11.89 4.5240 6.17 3.16 7.12 3.54 8.14 3.86 8.91 4.17 9.86 4.47 10.80 4.7545 5.12 2.95 6.18 3.47 7.07 3.89 7.98 4.25

MCU(+) 130

25 9.69 3.14 10.71 3.46 11.72 3.73 12.76 4.01 13.71 4.28 14.56 4.5430 9.09 3.16 10.07 3.46 11.11 3.74 12.12 4.08 13.05 4.36 13.93 4.6835 8.27 3.27 9.32 3.61 10.27 3.91 11.34 4.25 12.41 4.56 13.29 4.9140 7.61 3.29 8.58 3.65 9.54 4.01 10.44 4.31 11.46 4.6845 6.89 3.34 7.63 3.68 8.68 4.09

MCU(+) 150

25 11.06 3.73 12.26 4.13 13.26 4.46 14.30 4.82 15.24 5.15 16.19 5.4730 10.42 3.75 11.52 4.14 12.56 4.48 13.57 4.88 14.56 5.24 15.48 5.6335 9.46 3.89 10.59 4.32 11.61 4.68 12.69 5.08 13.77 5.47 14.77 5.9040 8.70 3.90 9.79 4.35 10.76 4.78 11.67 5.1545 7.90 3.98 8.89 4.40

MCU(+) 165

25 11.97 4.13 13.30 4.57 14.29 4.95 15.32 5.36 16.26 5.73 17.28 6.0930 11.31 4.15 12.49 4.59 13.52 4.98 14.54 5.42 15.57 5.82 16.51 6.2635 10.26 4.30 11.44 4.79 12.51 5.19 13.59 5.64 14.67 6.08 15.75 6.5640 9.43 4.31 10.60 4.81 11.58 5.29 12.49 5.7145 8.57 4.41

MCU(+) 180

25 13.42 4.71 14.97 5.12 16.28 5.45 17.63 5.79 18.86 6.13 20.27 6.4730 12.74 4.75 14.13 5.16 15.39 5.51 16.76 5.90 18.08 6.26 19.34 6.6435 11.52 4.94 12.94 5.38 14.34 5.76 15.67 6.16 17.12 6.56 18.51 6.9840 10.63 4.96 11.97 5.44 13.28 5.89 14.43 6.26 15.95 6.74 17.31 7.1845 9.72 5.10 10.95 5.61 12.17 6.09 13.31 6.49 14.63 6.98

MCU(+) 200

25 15.28 5.37 16.96 5.90 18.96 6.47 21.12 6.87 22.34 7.28 23.48 7.6530 14.42 5.41 16.01 5.92 17.73 6.41 19.75 6.96 21.18 7.40 22.52 7.8835 13.13 5.51 14.68 6.17 16.49 6.68 18.30 7.23 19.88 7.74 21.48 8.2740 12.03 5.62 13.59 6.24 15.13 6.82 16.58 7.31 18.33 7.9245 10.99 5.78 12.36 6.42 13.80 7.03

Note: Operation in the shaded areas of the tables will result in unacceptably high condensing temperatures and should be avoided.



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DCUE 15 - 80 CONDENSING UNIT CAPACITIES

MODELAir on to

Condenser�C

Saturated Suction Temperature �C-2.5 0 2.5 5 7.5 10

Cooling capacity and power input kWCap. Power Cap. Power Cap. Power Cap. Power Cap. Power Cap. Power

DCUE 15

25 1.88 0.97 2.12 1.03 2.35 1.08 2.61 1.13 2.87 1.16 3.21 1.1930 1.71 1.00 1.94 1.07 2.17 1.11 2.43 1.17 2.74 1.21 2.98 1.2535 1.67 1.05 1.88 1.12 2.02 1.17 2.33 1.23 2.55 1.27 2.68 1.3240 1.47 1.07 1.74 1.16 1.87 1.21 2.17 1.26 2.37 1.32 2.57 1.3545 1.45 1.10 1.63 1.19 1.83 1.27 2.01 1.32 2.29 1.35 2.38 1.41

DCUE 20

25 2.25 1.19 2.49 1.26 2.71 1.30 2.96 1.35 3.22 1.41 3.49 1.4630 2.08 1.22 2.31 1.28 2.54 1.34 2.78 1.40 3.01 1.45 3.26 1.5135 1.94 1.26 2.16 1.33 2.38 1.40 2.61 1.46 2.84 1.52 3.05 1.5840 1.83 1.30 2.04 1.37 2.25 1.44 2.46 1.50 2.66 1.56 2.86 1.6345 1.73 1.34 1.92 1.43 2.11 1.50 2.30 1.56 2.49 1.62 2.68 1.69

DCUE 30

25 2.87 1.44 3.22 1.52 3.53 1.59 3.74 1.65 4.12 1.72 4.49 1.7530 2.71 1.48 3.06 1.57 3.27 1.63 3.51 1.70 3.84 1.77 4.19 1.8235 2.59 1.55 2.82 1.62 3.03 1.70 3.36 1.77 3.68 1.85 3.79 1.9240 2.38 1.59 2.71 1.67 2.80 1.75 3.12 1.82 3.32 1.90 3.62 1.9745 2.11 1.65 2.43 1.73 2.53 1.83 2.84 1.91

DCUE 40

25 3.81 1.80 4.23 1.91 4.46 2.01 4.75 2.07 5.09 2.17 5.47 2.2630 3.56 1.87 3.97 1.97 4.27 2.04 4.57 2.13 4.79 2.23 5.16 2.3235 3.27 1.91 3.63 2.00 3.93 2.09 4.32 2.17 4.59 2.27 4.83 2.3740 3.17 1.96 3.41 2.05 3.31 2.13 4.03 2.22 4.28 2.3445 2.98 2.02 3.20 2.09

DCUE 50

25 4.57 1.87 5.09 2.03 5.51 2.14 5.97 2.25 6.41 2.38 6.79 2.5130 4.34 1.95 4.75 2.09 5.25 2.19 5.63 2.32 6.04 2.45 6.49 2.5835 3.94 2.00 4.42 2.13 4.91 2.24 5.29 2.36 5.75 2.49 6.09 5.6540 3.76 2.05 4.22 2.18 4.58 2.29 5.04 2.41 5.39 2.58 5.69 2.7445 3.50 2.12 3.93 2.22 4.37 2.35 4.69 2.48

DCUE 60

25 4.96 2.28 5.48 2.44 5.99 2.58 6.45 2.72 6.97 2.84 7.46 2.9630 4.62 2.37 5.10 2.52 5.64 2.64 6.11 2.78 6.62 2.91 7.07 3.0435 4.33 2.42 4.81 2.56 5.30 2.70 5.79 2.84 6.25 2.97 6.67 3.1240 4.06 2.48 4.52 2.62 4.98 2.76 5.44 2.89 5.88 3.0745 3.81 2.56 4.24 2.67

DCUE 80

25 5.90 2.68 6.44 2.88 6.84 3.05 7.31 3.18 7.73 3.33 8.21 3.4730 5.49 2.78 6.01 2.97 6.51 3.10 6.99 3.26 7.38 3.41 7.82 3.5635 5.09 2.85 5.60 3.02 6.09 3.17 6.57 3.32 6.93 3.47 7.35 3.6440 4.76 2.92 5.32 3.08 5.68 3.23 6.15 3.3845 4.54 3.00

Note: Operation in the shaded areas of the tables will result in unacceptably high condensing temperatures and should be avoided.



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INSTALLATION of 550 Series CONDENSING UNITS

These outdoor units are supplied fitted with an expansion device which contains a restrictor to controlrefrigerant flow. For use in systems which have their own refrigerant control at the indoor unit (eg. a capillary), removeand discard the expansion device connected to the condensing unit prior to installation.

Note: It is easier to fit kits prior to mounting the unit.

These units are designed to stand on a flat surface. If the unit is to be wall mounted thefollowing kits are available.(IMI Air Conditioning cannot accept liability for installers own mounting arrangements).

Model MCU(+) 15 - 80 MCU(+) 90 - 200Mounting Bracket Kit 55021100 55021101

Whether floor or wall mounted, it is essential that the mounting surface is capable ofsupporting the unit weight. Leave space around the unit for air circulation and access for installation and maintenance.

MOUNTING: MCU(+) 15 - 100

Dimensions in mm.

MODEL A B C D E F G H J K Weight (kg)1 Ph 3 Ph

MCU(+) 15 900 300 560 525 185 60 333 308 290 260 45 (39*) --MCU(+) 20 900 300 560 525 185 60 333 308 290 260 46 (40*) --MCU(+) 30 900 300 560 525 185 60 333 308 290 260 48 (41*) 48MCU(+) 40 900 300 560 525 185 60 333 308 290 260 53 (45*) 53MCU(+) 50 1000 300 660 570 213 60 333 308 290 260 64 62MCU(+) 60 1000 300 660 570 213 60 333 308 290 260 65 63MCU(+) 80 1000 300 660 570 213 60 333 308 290 260 66 64MCU(+) 90 1000 350 760 495 250 70 383 358 340 310 76 73MCU(+) 100 1000 350 760 495 250 70 383 358 340 310 -- 81

*Obsolete R407C and R22 models fitted with a rotary compressor



-8-

MOUNTING: MCU(+) 130 - 200

Dimensions in mm.

MODEL A B C D E F G H J K Weight (kg)MCU(+) 130 1000 425 1020 495 251 100 458 433 415 385 101MCU(+) 150 1000 425 1020 495 251 100 458 433 415 385 103MCU(+) 165 1000 425 1020 495 251 100 458 433 415 385 103MCU(+) 180 1100 425 1215 675 211 95 458 433 415 385 118MCU(+) 200 1100 425 1215 675 211 95 458 433 415 385 173

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-9-

INSTALLING 542 SERIES DUCTED CONDENSING UNITS

MOUNTING

Units are supplied with a polystyrene packing piece supporting the blower assembly, this MUST be removed prior tocommissioning.Ducted Units are designed to be hung on a wall (kit available), suspended from a ceiling (installer supplied fittings), or tostand on a flat surface. Whichever method is used it is essential that the mounting surface is capable of supporting the unitsweight.

DIMENSIONS

Model A B C D E F G H J K Spigot dia. Weight (kg)DCUE 10 (Obs) 930 510 495 1004 490 65 65 210 317 717 354 66DCUE 15 930 510 495 1004 490 65 65 210 317 717 354 69DCUE 20 930 510 495 1004 490 65 65 210 317 717 354 70DCUE 30 930 510 495 1004 490 65 65 210 317 717 354 70DCUE 40 930 510 495 1004 490 65 65 210 317 717 354 72DCUE 50 1100 510 560 1174 490 65 65 240 392 865 404 81DCUE 60 1100 510 560 1174 490 65 65 240 392 865 404 81DCUE 80 1100 510 560 1174 490 65 65 240 392 865 404 84

FLOOR MOUNTINGUsing the appropriate side of the packing carton as atemplate, (centres marked A), mark out and drill 4 holesto suit maximum M8 bolts (also see opposite). Secure theunit to the floor. Discard the stabilizing brackets.

Dimensions in mm.

Model A B10 to 40 930 51050 to 80 1100 510



-10-

SUSPENSION MOUNTING

The installer must supply 4 x M8 threaded rods with 16 nuts and washers to suit.

IMPORTANT: The stabilizing brackets provided MUST be used when suspending a unit.Fit the stabilizing brackets to the top corners of the backpanel and front face using the No. 10 screwsprovided, (2 per bracket). If these brackets are omitted the unit will be subject to unacceptable movement on compressor start.

Where long drops of M8 rod are used, it is advisable to incorporateflexible pipes in the suction and expansion lines to absorb anymovement of the unit.

Using the template printed on the side of the packing carton,(centres marked A), mark out the ceiling and drill 4 holes to suit M8screwed rod.

Raise the unit to the required height and pass the screwed rodsthrough the mounting holes in the units feet and stabilizingbrackets.

Secure the unit with a nut and washer on either side of eachstabilizing bracket and two nuts and washers underneath each footmounting hole, (as shown).

WALL MOUNTING

Wall mounting brackets are available as an optional kit (53200407).

DUCTWORK

Each unit is supplied with air inlet and discharge spigots:-Models 10 to 40 - 354mm (14") dia.: Models 50 to 80 - 404mm (16") dia.

These may be used for connecting installers ducting or used with the optional duct, plenum and grille kits.

Refer to the kit instruction for installation methods.

The front face of the units are also fitted with M6 rivnuts to accept installer supplied square ducting, see dimensions below.Maximum flange width is 25mm and fixing holes should be central within them.

NOTE: It is essential that ducting is adequately insulated to prevent sweating. An insulation thickness of at least 45mmis recommended.

Dimensionsmm.

Model10 to 40 50 to 80

A 400 450B 300 350C 100 100

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-11-

APPLICATION

These outdoor units are supplied fitted with an expansion device which contains a restrictor to control refrigerant flow.For use in systems which have refrigerant control at the indoor unit, remove and discard the expansion deviceconnected to the condensing unit prior to installation.

1 To maximise performance, pipe runs should be kept as short as possible, avoiding sharp bends. However, individualpipe runs to a maximum of 45m (80m when the expansion device is retained) on air conditioners, are permissibleprovided good refrigeration practice is followed (except for obsolete 1 Ph models with rotary compressors, i.e.,up to and including size 40, which have a maximum run of 15m). Published performance duties are based on 7.5m pipe runs. Correctly sized pipes for each installation will result inno significant loss of capacity on extended pipe runs.a) Pipe sizes are based on:-

Minimum of 3.8 m/s (750 fpm) suction gas velocity for horizontal or downflow.Minimum of 7.6 m/s (1500 fpm) suction gas velocity for upflow.Maximum of 15.2 m/s (3000 fpm) suction gas.

b) Where vertical risers exceed 3m, oil traps must be formed in the pipe. This will help ensure that oil returns tothe compressor. Typically fit an oil trap every 3m with a trap at the bottom of the riser.

2 Add 25 grams of refrigerant oil (polyolester oil for all units except those fitted with rotary compressors which containPVE oil and need no extra) for every 350 grams of charge added to systems with pipe runs exceeding 25m, up to amaximum of 300 grams; preferably by slowly pumping into the suction side with the unit running, after charging thesystem.

3 For systems with refrigerant control at the indoor OR outdoor unit ; the table below shows the suggested pipe sizes(in inches) and equivalent lengths.

WITH EXPANSION DEVICE AT THE MCU(+) WITH INDOOR REFRIGERANT CONTROL

MAXIMUM EQUIVALENT LENGTHOF SUCTION LINE

PIPES (m)

EXPANSIONLINE PIPE

SIZES

MAXIMUM EQUVALENT LENGTH OF SUCTIONLINE PIPES (m) LIQUID LINE PIPE

SIZESHORIZONTAL OR DOWNFLOW UPFLOW

UNIT 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 3/8 1/2 5/8 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 MAX. 15m 1/4 3/8 1/2 5/8MCU(+) 15* 7.5 50 50 8 21 3/8 21MCU(+) 20* 50 50 8 21 3/8 21MCU(+) 30* 12 40 80 50 80 8 45 1/2 21 45MCU(+) 40* 8 25 80 7.5 80 8 23 45 1/2 45MCU(+) 50 18 50 80 7.5 50 80 8 15 45 5/8 21 45MCU(+) 60 15 45 80 7.5 50 80 7.5 21 45 5/8 21 45MCU(+) 80 12 35 80 7.5 50 80 7.5 21 45 5/8 21 45MCU(+) 90 7.5 20 40 80 7.5 80 7.5 21 45 5/8 21 45MCU(+) 100 15 30 80 7.5 80 7.5 21 45 3/4 21 45MCU(+) 130 10 20 80 7.5 80 7.5 21 45 3/4 21 45MCU(+) 150 10 20 80 7.5 80 7.5 21 45 3/4 21 45MCU(+) 165 7.5 15 50 80 7.5 80 8 21 45 3/4 21 45MCU(+) 180 7.5 15 50 80 7.5 80 8 21 45 1-1/8 21 45

MCU(+) 200 7.5 15 50 80 7.5 80 8 21 45 1-1/8 21 45* Units with 1 Ph rotary compressors should not be used on pipe runs exceeding 20m.

4 In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into account. The tablebelow covers the fittings most likely to be encountered in this type of installation. The equivalent lengths of all thefittings in a particular pipe run must be added together and the total added to the actual length of pipe in the run, inorder to calculate the total equivalent length.

FITTING LOSSES, in equivalent straight lengths of pipe (metres).Pipe Size (outside diameter in inches)

Fitting 3/8 1/2 5/8 3/4 7/8 1-1/845� Bend 0.12 0.15 0.18 0.21 0.24 0.390� Bend R/d = 1 0.37 0.43 0.49 0.55 0.61 0.7990� Bend R/d = 2 0.24 0.27 0.30 0.37 0.43 0.52180� Bend C/d = 1 0.73 0.91 1.10 1.28 1.46 1.83180� Bend C/d = 2 0.46 0.55 0.64 0.76 0.85 1.0790� Elbow 0.67 0.85 1.04 1.25 1.46 1.89

R = Radius of bend d = Diameter of tube C = Centres of bend

5 Use the shortest possible route, avoiding sharp bends.6 Fully insulate the suction line, (or suction and liquid line if run together).



-12-

PIPE CONNECTIONS

1 Outdoor units are supplied with the following male flare connections (sizes in inches);

Model MCU / MCU+ / DCUESize 15 20 30 40 50 60 80 90 100 130 150 165 180 200Suction 3/8 3/8 1/2 1/2 1/2 5/8 5/8 5/8 3/4 3/4 3/4 3/4 7/8* 7/8*Liquid 3/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2

* Brazed connections

NOTE: Ensure that both service valves on the outdoor unit are closed (IN, fully clockwise) before commencing installation.

IMI Air Conditioning Indoor units have a low pressure holding charge of nitrogen, which may be released into theatmosphere without damage to the environment. This should be done prior to making pipework connections.

All units are supplied fitted with expansion devices.

These are for use on systems not utilising indoor expansion. On systems with refrigerant control fitted to the indoor unit, remove and discard the expansion device fittedto the valve.

2 Remove both flare nuts from the service valves.3 Ensure that the suction line is fully insulated.4 Place the flare nuts over the incoming pipework and flare the pipe ends.5 Connect the pipework between the units. Do not leave pipe ends, valves etc. open to the atmosphere. Always use

two spanners when tightening the flare nuts.6 If a filter drier is used, site this in the liquid line. If a sight glass is fitted it should be as close to the indoor unit as

possible.

BRAZING (if applicable)

It is imperative that the valve is not overheated during brazing (to avoid damaging the seals).Thisis done by wrapping the valve in a wet rag as shown below. It is also advisable to protect the sidepanel.

KEEPING THE VALVE COOL DURING BRAZING:

--o--o--O--O--O--o--o--

ELECTRICAL CONNECTIONS

Mains, control and interconnecting cables are supplied and fitted by the installer.Installer wiring must be carried out in accordance with local and national codes.Mains supply cables must be size compatible with the recommended fuse for a given system.An all pole isolator switch should be positioned within easy reach of the indoor unit.The equipment must be earthed.

MCU / MCU+ SYSTEMS:All MCU / MCU+ systems require a supply to the outdoor unit with connecting cables run to the indoor unit.



-13-

OUTDOOR UNIT WIRINGCable entry for the outdoor unit electrics is through the cabinet to a terminal block. MCU+, MHPUE and DCUE units are supplied wired via a head pressure controller to give maximum control. Ensurethat all connections are secure and that both units are earthed.MCU unit fan motors have a high speed (black) wire and a low speed (red) wire; the speed not being used is wiredinto a dummy terminal. They are supplied wired for low fan speed, which is suitable for temperate climates. Ifcontinuous running is expected at ambient temperatures of 35/C or higher, change to high speed by interchangingthe black and red wires, i.e. black to fused terminal, red to terminal 4 (single fan units) or terminals 4 and 8 (doublefan units).

3Ph SCROLL COMPRESSOR ROTATION

On 3 Phase unit sizes 50 to 200 it is possible for the scroll compressor to run backwards. This becomes obvious on startup; the compressor will not develop a normal running pressure differential and the top will not become warm. It may beexcessively noisy. If this happens, switch off the mains power and exchange any two of the phases supplying the unit.This will correct the rotation of the compressor.

DATA PLATES

Because of the ability to mix-match indoor and outdoor units, the data plate only gives information on outdoor units. Toobtain the system details, input power and currents from indoor and outdoor units should be added together. Data platesshow basic units only, and do not include kit loads, e.g. electric heater loads.

FACTORY CHARGE OF REFRIGERANTEach outdoor unit is charged with refrigerant, detailed in the tables below. Refer to the indoor unit installation instruction to calculate the amount of refrigerant required for the whole system.

R407C charge R22 charge R407C charge R22 chargeMCU(+) gms gms DCUE gms gms

15 660 630 10 (Obs) 570 54020 1030 980 15 600 57030 1000 950 20 930 88040 1240 1180 30 990 93050 1690 1610 40 1050 99060 2000 1900 50 1240 125080 1880 1800 60 1190 114090 2060 1960 80 1480 1400

100 2520 2400130 4170 3970150 4170 3970165 4540 4320180 4640 4420200 5480 5220

EVACUATING1. Connect a vacuum pump to the service ports on the outdoor unit valves and evacuate the interconnecting

pipework and indoor unit to 1000 microns (1 Torr) or better and allow to be held for a minimum of 15 minutes.2. If NO additional refrigerant charge is required:

Replace the caps on the service ports, (tighten to a torque of 25NM), and open the valves using a 4 or 5mm Allenkey. On DCUE, REMOVE link JP6 identified by a white label, (otherwise the unit will always run at full speed).

ADDING REFRIGERANT1. If additional refrigerant charge is required:

After evacuating the indoor unit and interconnecting pipework, open the valves using a 4 or 5mm Allen key. The highand low side pressures should equalise within a minute.

2. Additional charge for all systems should be introduced with the system in the AIR CONDITIONING MODE.3. Additional charge should be introduced through the Schrader valve on the indoor unit or the service port on the

suction service valve on the outdoor unit.4. DCUE are supplied with link JP6 fitted on the outdoor unit pcba; this allows additional charging. The DCUE fans

will run at high speed.NOTE: MCU+ units are fitted with head pressure control; before charging, isolate the unit and transfer the blue

wire on the head pressure control from terminal 4 to terminal 1. Do NOT forget to transfer it back once charging is complete.

5. Ensure that the refrigerant being added is the same refrigerant that the system was originally charged with.6. If a manual HP cutout is fitted, ensure that the reset button is depressed.7. On DCUE models a random start delay of up to 1 minute occurs when mains is first applied. A 3 minute delay occurs

between successive compressor operations on all systems incorporating DCUE units, or MCU(+) units fitted witha 3 minute timer kit.

8. Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the evaporator.Care should be taken when the compressor is first started in the field to ensure that the system is not overcharged,in which case liquid return to the compressor could result.

9. On DCUE units, once refrigerant has been added, REMOVE link JP6, identified by a white label (otherwise the unitwill always run at full speed). On MCU+ units transfer the blue wire back from 1 to 4.



-14-

WHEN INSTALLATION HAS BEEN COMPLETED - CHECK :-

1 All pipe work and joints for leakage. DO NOT USE COLOURED OIL ADDITIVES FOR LEAK DETECTION

2 All pipe work and fittings for insulation.

3 All bolts are secure and that the fan rotates freely.

MCU WIRING DIAGRAMS

1 Phase MCU 15 to 90 3 Phase MCU 30 to 100

3 Phase MCU 130 to 180 3 Phase MCU 200



-15-

MCU(+) WIRING DIAGRAMS

1 Phase MCU+ 15 to 90 3 Phase MCU+ 30 to 100

3 Phase MCU+ 130 to 180 3 Phase MCU+ 200



-16-

ELECTRONIC DCUE WIRING DIAGRAMS

1 Phase DCUE 10 - 60

1 Phase DCUE 80

3 Phase DCUE 30 to 80



-17-

PTC COMPRESSOR START KIT 55000412

This kit is for use on single phase 550 series condensing units (MCU and MCU+) models 15 to 40 using reciprocatingcompressors, and all single phase 542 series ducted condensing units (DCUE).

The Positive Temperature Coefficient (PTC) kit may be used to increase the torque to a single phase reciprocatingcompressor, to assist those installations where the standard PSC compressor needs higher starting torque. It reduces theduration of high start current, but not the peak value.

ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION1 1 PTC Device 4 1 Blue Cable2 1 PTC Clip 5 1 Double Spade Terminal3 1 White Cable 6 3 Cable Tie

ISOLATE ELECTRICALLY PRIOR TO INSTALLATION OF KIT.

1 Remove the three front access panel retaining screws to reveal the electrics box.

2 The PTC device is fitted: to the base of the electrics tray on the left hand side for MCU(+) (Fig. 1) centrally on the back face for DCUE (Fig. 2).

3 Remove the clip from the PTC bobbin and slide the clip into the larger hole in the base of the electrics tray (MCU(+))and the larger hole in the back panel to the left of the contactor on DCUE.

4 Connect the flag connectors of the blue and white cables to the PTC device (which is non-polar). Press the PTCdevice into the clip (Fig. 3) and connect the in-line connectors to the compressor capacitor, using the double spadeterminal on the neutral side of the capacitor.

5 Secure the wires to the existing loom using the cable ties provided.

Fig. 1. MCU(+) Fig. 2. DCUE

Fig. 3.

PTC Wiring Diagram

--o--o--O--O--O--o--o--



-18-

CSR COMPRESSOR START KITS FOR MCU / MCU+ 55000413 to 415

This kit may be used on single phase 550 series Condensing Units.

The Capacitor Start Relay (CSR) kit is used to increase the torque to a single phase compressor, to assist thoseinstallations where the standard PSC compressor has insufficient torque. It performs a similar function to the PTC kit butgives a higher torque to the compressor, further reducing the time during which high starting current is experienced, butnot the peak value. It should be used when a PTC kit is likely to be insufficient, such as systems with long pipe runs or inextremely cold ambients.

KITMCU(+) MHPUE(L) ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION

R22 R407C R22 R407C 1 1 Relay 7* 1 Capacitor55000413 15 - 40 15 - 40 2 1 White Wire 8* 1 Orange Wire55000414 15, 20, 40 15, 20, 40 3 1 Capacitor Clip 9* 1 Blue Wire55000415 30 30 4 1 Double Spade 10 3 Cable Tie

5 2 No. 10 Screw *Items 7 to 9 are supplied subassembled6 1 Black Wire

ISOLATE THE UNIT ELECTRICALLY PRIOR TO INSTALLATION OF THE KIT

MCU(+) MODELS

1 Release the three access panel retaining screws and remove thepanel to reveal the electrics tray.

2 Secure the capacitor clip to the base of the electrics box, in the small hole to the left of the grommeted hole, using a No. 10 screw. Ensure that the capacitor clip is positioned with the long end to the left hand side. Press in the capacitor with the wires to the right.

RELAYS

ELECTRICA orAMF RELAY

GE RELAY

UNIT SIZE TYPERVA

TYPE3ARR3

15 - 40, R22 �3AL� Fig. 1.15, 20, 40, R407C 3G3C or 3G3D �10AS�

30, R407C 4L3C or 4L3D �6AV�

3 Secure the relay to the back of the electrics tray, underneath the contactor, using a No. 10 screw (Fig. 1).

4 Connect the wires as shown in the table and figure 2:

WIRE TERMINATIONS FROM TOOrange Flag and Female CSR Cap Relay 1

Blue Flag and Female CSR Cap Comp Cap*White Flag and Female Relay 2 Comp CapBlack Flag and Fork Relay 5 Cont 6

* Use the double spade terminal on the Compressor CapacitorNeutral if necessary.

5 Tidy the wires by fastening to the existing harness using thecable ties provided.

Fig. 2.

--o--o--O--O--O--o--o--



-19-

CSR COMPRESSOR START KITS 54000403 to 406, 415 and 423 FOR DCUE

This kit may be used on single phase 542 series ducted condensing units.

The Capacitor Start Relay (CSR) kit may be used to increase the torque to a single phase compressor, to assistthose installations where the 'as supplied' PSC compressor has insufficient torque. It performs a similar functionto the PTC kit but gives a higher torque to the compressor, further reducing the time during which high startingcurrent is experienced, but not the peak value. It should be used when a PTC kit is likely to be insufficient suchas for systems with long pipe runs or in extremely cold ambient conditions.

UNIT SIZE KIT ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION10, 15, 20, 40 54000403 1 1 Capacitor Clip 7 1 Orange Lead

30 54000404 2 1 Capacitor 8 1 White Lead50 54000405 3 1 Relay Mounting Bracket (not 403/404) 9 1 Black Lead

60, 80 54000406 4 1 Relay 10 1 Blue Lead90, (FH5538E Comp.) 54000423 5 2 4BA Screw (not 403/404) 11 1 Double Spade Terminal90, (AH5540E Comp.) 54000415 6 2 No. 10 Screw 12 3 Cable Tie


1 Release the four side access panel retaining screws (valve end).Also removing the lid will make fitting this kit easier.

2 Ensuring that the capacitor clip is positioned with the long end to the left hand side, secure the capacitor clip into the hole nearest the front left hand side of the electrics box using one No. 10 screw and press in the capacitor with the terminals facing right (Fig. 1).

3 Identify whether the relay terminals are to be horizontal or vertical when Fig. 1.mounted, from the tables below, and secure the relay to the electrics plate (Figs 2 and 3).

RELAYS -- TERMINALS VERTICAL RELAYS -- TERMINALS HORIZONTAL

ELECTRICA or AMF RELAY GE RELAY ELECTRICA or

AMF RELAY GE RELAY

UNIT SIZE TYPERVA

TYPE3ARR3 UNIT SIZE TYPE

RVATYPE

3ARR310, 15, 20, 40 -- -- 10, 15, 20, 40 3G3C B10AS330 -- -- 30 4L3C B6AV350 -- U6AU2 50 4LOD --60, 80 -- U10AS2 60, 80 3GOD --90 -- U4AA2 90 -- --

Fit the relay to the bracket using two 4BA screws (Fig. 2). Secure the relay directly to the electrics tray using Secure the bracket to the electrics tray using one No. 10 screw (Fig. 3).one No 10 screw (Fig. 3).

Fig. 2. Fig. 3.

4 Connect the wires as shown in the table and figure 4:

WIRE TERMINATIONS FROM TOOrange Flag and Female Relay 1 CSR CapWhite Flag and Female Relay 2 Comp CapBlack Flag and Fork Relay 5 Cont 6Blue Female and Comp Cap* CSR Cap

* Use the double spade terminal on the Compressor Capacitor Neutral.

5 Tidy the wires by fastening to the existing harness using the cable ties provided.

Fig. 4.



-20-

Fig. 1.

Fig. 2.

HEAD PRESSURE CONTROL KIT 55000487 (50Hz) and 55000496 (60Hz)

This kit is for use on 550 series condensing units (MCU) to maintain a sufficiently high head pressure in cool ambientconditions by reducing the speed of the fan. This will keep the suction pressure high enough to prevent frosting of theevaporator, which might otherwise occur.The use of this kit is recommended to minimise latent cooling on all high sensible systems and for all systems likely tooperate at ambient temperatures below 10�C.

CONTENTSITEM QTY DESCRIPTION ITEM QTY DESCRIPTION

1 1 Head Pressure Control (HPC) Assembly 7 6 Small Cable Tie2 4 No. 8 Screw 8 4 M4 Screw3 4 PCBA Mounting Foot 9 1 Tee Connector4 3 Copper Gasket 10 2 Edge Clip5 1 Mounting Plate 11 1 Green/Yellow Wire6 2 Double Spade Terminal (for models 130 - 200) 12 2 Red Terminals (fitted to PCBA)

1 Fully commission the system without thehead pressure control. If this is not done,The head pressure control will operateincorrectly.

2 Isolate the unit electrically prior toinstallation of the kit.

3 Release the front access panel retaining screwsand remove the panel to reveal the electrics box.

4 Remove the blue and red wires from the plasticparking head terminal on the rear face of theelectrics box. Remove and discard the parkinghead.

5 a If the rear of the electrics box has 4 fixing holesthat line up with those in the HPC assembly, fixdirectly with 4 off No. 8 screws.

b If there are slots in the base of the electricsbox, mount the HPC assembly using 2 off No. 8screws (Fig. 1)

c Otherwise, secure the mounting plate to therear of the electrics box using 4 off mounting feet.Earth the mounting plate using 2 off edge clipsand the g/y wire.

If a volt free relay, 3 min timer or LP bypass timeris already fitted, remove and fit to the upperportion of the mounting plate. above the HPCpcba (Fig. 2) Fix the HPC assy to the mounting plate (Fig. 2),terminals to the right, using 4 off No. 8 screws.

6 Connect the blue and red wires (removed fromthe parking head) to the HPC assy (Figs.3, 4).

Fig. 3. MCU 15 - 100 Fig. 4. MCU 130 - 200



-21-

7 Remove the white wire from the fan motor capacitor and reroute to the PCBA terminal 4. (On MCU 130 - 200, moveone white wire from each capacitor and use the double spade terminal).

8 On MCU 15 to 100 only, remove the electrics entry cover on the right hand panel.

9 MCU 15 to 100: Interchange the fan motor black and red leads at the lower side fused terminal block (i.e., blacklead to the fused terminal block, red lead to terminal No. 4).

MCU 130 to 200: Interchange the fan motor red leads at terminal block No. 9 with the fan motor black leads at dummy terminal blocks No's 8 and 4.

10 CONNECTING THE CAPILLARY

i) Route the capillary through the hole in the electrics plate directly below the PCBA (Fig.1).If the electrics box does not have an appropriate hole, route the capillary down the front of the electrics box and alongthe compressor wiring harness (Fig. 2). Avoid any twisting or kinking of the capillary.Assess the length of capillary required by extending it to reach the liquid line connection (figures 1 and 2). Any excesslength should be coiled and tied to the compressor wiring harness using the cable ties.

ii) Place a copper gasket between the fitting and the nut and connect to the liquid line. Use a little refrigerant oil on themating surfaces and tighten using two spanners.

If the liquid line connection has a pressure switch already fitted, cut the cable ties holding the pressure switch wiresto the compressor harness and remove the pressure switch, (discard the copper gasket). Fit the pressure switch andhead pressure control capillary to the 'TEE' piece using the new copper gaskets. Fit the 'TEE' piece to the liquid lineusing another copper gasket, (Fig. 5).

Fig. 5.

11 Refit the electrics cover.

12 Secure the kit wires to the existing harness using the cable ties.

13 The head pressure controller needs to be set to suit the refrigerant and site conditions, either to raise or lower thenominal head pressure.

a With the system switched off, connect a high pressuregauge to the liquid line service valve.

b Switch on the system, indoor fan set to high speed, andrun for a few minutes to stabilise.

c The head pressure should be approximately:-R22: 235 - 250 psig (16.2 - 17.3 barg) R407C: 275 - 280 psig (18.9 - 19.6 barg)

To achieve this, adjust the screw clockwise to increase thepressure or anticlockwise to reduce it.

Each ½ turn will alter the pressure by approx 5 psig (0.5 barg)

Min fan speed is 0 rpm: fan cut in pressure is approx 200psig (13.8 barg), but will vary with set point adjustment.

--o--o--O--O--O--o--o--



-22-

Fig. 1.

COMPRESSOR JACKET KIT 55000453 to 457

These kits are for use on 550 Series condensing units and 551 Series heat pump outdoor units to insulate the compressorand help reduce noise. It is NOT recommended for use in tropical applications.

Kit PartNumber Refrigerant Compressor

Type1 or 3Phase MCU MCU+ MHPUL MHPUE MCU+ DUO*

55000453 R22 Rotary 1 15 - 40 15 - 40 15 - 40 15 - 40 -55000454 R22 Reciprocating 3 30 - 40 30 - 40 30 - 40 30 - 40 4055000454 R407C Reciprocating 1 or 3 15 - 40 15 - 40 15 - 40 15 - 40 4055000455 R22 or R407C Scroll 1 or 3 50 - 80 50 - 80 50 - 80 50 - 80 6055000456 R22 or R407C Scroll 1 or 3 90 - 180 90 - 180 90 - 180 90 - 180 -55000457 R22 or R407C Scroll 3 200 200 - - -

* One kit per circuit

CONTENTS

Item Qty Description1 1 Compressor Jacket

It is easier to fit this kit prior to installing the unit. If the unit is already installed, ensure that the electrical supplyto the unit is fully isolated.

1 Release the 3 front access panel retaining screws and remove the panel.

2 The compressor jacket used on any of the units listed below needs shortening before fitting. Dimension 'A' should becut from the bottom of the jacket. All other units can be fitted without making any modifications.

UNIT DIMENSION 'A'MCU(+) 15, MHPUE 15, MHPUL 15 20mm

*MCU(+) 50/60, MHPUE 50, MHPUL 50 50mm*MCU(+) 80, MHPUE 60/80, MHPUL 60/80 30mm

* Style of Compressor Jacket shown in Fig. 1.

3 Slide the jacket around the compressor ensuring that the notchesalign with the pipework.

4 Secure the fixing tabs.

5 Replace and secure the front access panel.

--o--o--O--O--O--o--o--



-23-

HIGH PRESSURE SWITCH KITS 55000401 & 55000402 KIT USED ON PRESSURE SWITCH CUT OUT PRESSURE CUT IN PRESSURE

55000401 MCU(+), MHPUL HP Manual 2760kPa (400psig, 27.2 bar g) 2280kPa(330psig, 22.5 bar g)

55000402 MHPUE HP Auto 2760kPa (400psig, 27.2 bar g) 2280kPa (330psig, 22.5 bar g)

ITEM QTY DESCRIPTION1 1 HP cartridge pressure switch2 1 Copper gasket3 4 Cable tie4 1 In-line connector

Manual high pressure switches are reset by pushing the red button.


1 Remove the front access panel (three screws) and the electrical supply cover.

2 The HP switch should be fitted to the discharge line service port as shown below.

3 Using a little refrigeration oil for lubrication, place the gasket inside the switch and screw onto the appropriate serviceport. Secure using two open ended spanners on the hexagonal connectors (typical torque 9Nm). Ensure thatthe switch depressor connects properly (this will be accompanied by a slight hiss of refrigerant).

4 Ensure that there are no leaks around the connection using a suitable leak detector.

ELECTRICAL CONNECTIONSRoute the pressure switch flying leads through a grommet hole in the base of the electrics box, ensuring that they are clearof all pipework.

MCU 1Ø & MCU 3Ø

1. Locate the in-line connector with the violet and red wires and disconnect the red wire.

2. Connect the red HP switch wire to the red wire using the in-line connector supplied in the kit.

3. Connect the black HP switch wire to the in-line connector attached to the violet wire.

4. Cut the terminal from the blue HP switch wire and strip back the insulation by 10mm.

5. Connect the blue HP switch wire to terminal rail terminal 5.

6. Secure all wires neatly using cable ties.



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MCU 1Ø

with 3 min timer or LP+LP bypasstimer kit fitted

MCU 3Ø

with 3 min timer or LP+LP bypasstimer kit fitted

MCU 1Ø MCU 3Ø

MCU 1Ø & MCU 3Ø with 3 min timer or LP+LP bypass timer kit fitted.

Fit the timer kit before fitting the HP switch kit.

1. Locate the in-line connector connecting the violet wires. Disconnect the violet wire connected to the timer pcb terminal95 (LP switch) or terminal N/O (3min timer).

2. Connect the red HP switch wire to the violet wire (from terminal 95 or N/O) using the in-line connector supplied in thekit.

3. Connect the black HP switch wire to the free violet wire.

4. Cut the terminal from the blue HP switch wire and strip back 10mm of insulation.



MCU+ 1Ø & 3Ø

1. Locate the in-line connector connecting the two violet wires.Disconnect the two wires leaving the in-line connector on the violetwire connected to the LP bypass/off cycle timer terminal 95.

2. Connect the red HP switch wire to the in-line connector (linked to theviolet wire).

3. Connect the black HP switch wire to the free violet wire using the in-line connector supplied in the kit.

4. Cut the terminal from the blue HP switch wire and strip back theinsulation by 10mm.



--o--o--O--O--O--o--o--



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ISOLATOR KIT 54200451This kit is for use on ALL 542 series ducted condensing units to give electrical isolation of all live or potentially liveconductors within the unit.

ITEM QTY DESCRIPTION1 1 Isolator2 2 Blue Wire3 3 Black Wire4 1 Cable Tie5 1 Cover6 2 Screw

ISOLATE THE UNIT ELECTRICALLY PRIOR TO INSTALLATION OF THE KIT.

1 Remove the rear access panel (5 screws) and the side access panel (3 screws) at the valve end.

2 Remove the supply terminal block cover (1 screw) located on the vertical electric panel directlyabove the auxiliary terminals.

3 Remove the three 8mm diameter knockouts on the electrics support panel by knocking inwards (Fig. 1).

4 Remove the cable tie from the wires to the incoming mains terminal blocks.

1 = Isolator Cover2 = ODD terminals uppermost3 = Knockouts4 = ON position uppermost

Fig. 1.

5.1 SINGLE PHASE UNITS DCUE 10-60, (refer to Fig. 2).

a Remove the black and blue wires from the top of the incoming mains terminalblock and reconnect the black wire to isolator terminal 1 and the blue wire toisolator terminal N.

b Connect one of the blue wires in the kit between isolator terminal N and thetop of the incoming mains terminal N.

c Connect one of the black wires in the kit between isolator terminal 2 andthe top of the incoming mains terminal L.

d Discard the remaining kit wires.e Position the isolator as shown in Fig 1. ensuring that the odd numbered

terminals and 'ON' position are uppermost, and that the handle is square, thensecure to the unit.

Fig. 2.

5.2 SINGLE PHASE UNIT DCUE 80, (refer to Fig. 3).

a Remove the two black wires and the two blue wires from the top of the incomingmains terminal block and reconnect the black wires to isolator terminals 1 and3 and the blue wires to isolator terminals 5 and N.

b Connect the two blue wires in the kit between isolator terminals N and 6 and thetop of the two incoming mains terminals N.

c Connect two of the black wires in the kit between isolator terminals 2 and 4 andthe top of the two incoming mains terminals L.

d Discard the remaining black wire in the kit.e Position the isolator as shown in Fig 1. ensuring that the odd numbered


Fig. 3.



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5.3 THREE PHASE UNITS ALL MODELS, (refer to Fig. 4).

a Remove the three black wires from the top of the incoming mains terminalblocks L1, L2 and L3 and reconnect to isolator terminals 1, 3 and 5 respectively.

b Remove the blue wire from the top of the incoming mains terminal N andreconnect to isolator terminal N.

c Connect the three black leads in the kit between isolator terminals 2, 4 and 6and the top of the incoming mains terminals L1, L2 and L3 respectively.

d Connect one of the blue wires in the kit between isolator terminal N and the topof the incoming mains terminal N.

e Discard the remaining blue kit wire.f Position the isolator as shown in Fig 1. ensuring that the odd numbered


Fig. 3.

6 Secure the wires with the cable tie and replace the supply terminal cover and access panels. Fit the cover in the kitover the rear of the isolator (2 screws).

7 It is essential that the unit is always isolated prior to commencing maintenance of any kind.

8 If it is desirable to lock the isolator in the 'OFF' position to deter unauthorised operation, fit a padlock through the holesprovided.

9 IMI AIR CONDITIONING DO NOT RECOMMEND THAT THE ISOLATOR IS LOCKED IN THE 'ON' POSITION.

--o--o--O--O--O--o--o--



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Fig. 1

3 MINUTE TIMER KIT 55000493This kit is for 550 series MCU condensing units.

It provides a nominal 3 minute time delay between the compressor switching OFF and back ON. This allows system pressures to equalize and protect the compressor.

The timer also features a random delay of between 6 and 20 seconds at initial start up of the compressor, to stagger thestarting of multiple units.

ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION1* 1 PCBA 5* 1 Blue Wire2* 3 Mounting Foot 6* 1 Black Wire3* 1 Red Wire 7* 1 Brown Link Wire4* 1 Violet Wire 8 1 In-line Connector

*Items 1 to 7 are supplied sub-assembled 9 3 Cable Tie

If an HP switch is to be fitted, fit it before fitting this 3 minute timer kit.

ISOLATE THE UNIT ELECTRICALLY PRIOR TO FITTING THE KIT

1 Release three retaining screws in the front access panel and remove.Remove the terminal access cover.

2 The PCBA fits to the rear of the electrics box, left hand side (Fig. 1).

3 With the PCBA terminals facing right, press the mounting feet into the holes in therear face of the electrics box.

4 Cut the cable ties securing the harness and locate the violet and red wires (black andviolet on all units with a high pressure switch fitted). Split these wires and connect asdetailed in the tables below.

CONNECTIONS FOR UNITS WITHOUT HP SWITCH

WIRE CONNECT FROM CONNECT TORed PCBA Terminal 3 MCU Terminal 3, via in-line connector

Violet PCBA Terminal 95 Contactor A1 ( overload 95 or 97 if fitted), via in-line connector

Blue PCBA Terminal N Fan Motor Capacitor NeutralBlack PCBA Terminal L Contactor 1 (7 or 13 on 3 Phase)

CONNECTIONS FOR UNITS WITH HP SWITCH FITTED WIRE CONNECT FROM CONNECT TORed PCBA Terminal 3 HP Switch Black via in-line connector

Violet PCBA Terminal 95 Contactor A1 (overload 95 or 97 if fitted), via in-line connector

Blue PCBA Terminal N Fan Motor Capacitor NeutralBlack PCB Terminal L Contactor 1 (7 or 13 on 3 Phase)

5 Tie the cables onto the electrics tray: replace the covers.

Fig. 2.

--o--o--O--O--O--o--o--



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WALL BRACKET KIT 55021100 / 55021101

MCU(+) 15-80 MCU(+) 90-20055021100 55021101

55021100 & 55021101 55021101#1 2 Wall Bracket #6 2 Retaining bracket#2 2 Bolt M8 x 25 #7 2 Screw M5 x 12#3 2 Nut M8 #8 2 Washer M5#4 4 Anchor bolt / nut (M10)#5 4 Tee bolt / nut / washer (M8)

kg 15 20 30 40 50 60 80 90 100 130 150 165 180 200

MCU(+) 39 40 41 45 64 65 66 76 81 101 103 103 118 173

ISOLATE THE SYSTEM ELECTRICALLY PRIOR TO INSTALLATION OF THIS KIT



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--o--o--O--O--O--o--o--



-30-

DCUE WALL MOUNTING KIT 532 00 407

This kit is used to wall mount ducted condensing units.The brackets are designed to accept ONLY unit weights

Item Qty Description Item Qty Description Item Qty Description1 2 Wall mounting 3 4 M10 bolt 7 8 M8 bolt2 2 Wall mounting arm 4 12 M10 plain washer 8 8 M8 plain washer

5 4 M10 lock washer 9 16 M8 lock washer6 4 M10 nut 10 8 M8 nut

Assemble the mounting brackets and mounting arms using the M10 bolts, nuts and washers provided, (Fig. 1).Do not use the stabilizing brackets supplied with the unit on wall mounted applications as these will hinder the installation.

Using the relevant side of the ducted unit packing box as a template, (centres marked B), mark the wall and drill to suit M10Rawlbolts or fasteners of equivalent strength. Secure the mounting feet assemblies to the wall (installer supplied fasteners).

Weight (kg)

DCUE15 20 30 40 50 60 8069 70 70 72 81 81 84

Rest the unit on the mounting feet, ensuring thatthere is a washer between the unit and eachmounting foot, fit the M8 bolts, slide to the requiredposition and secure, (Fig. 1).

Do NOT release the unit support prior to securingthe unit to the mounting feet.

Fig. 1.

If the air on/off ducts face an external wall, it is possible to use 5m flexible duct and/or plenum and/or grille kits, availableas accessories.

Ducts facing the wall Ducts facing away from the wall

--o--o--O--O--O--o--o--



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OVERLOAD KITS FOR MCU / MCU+ 55000408 to 410, 446 and 449

These kits are for use on all single phase 550 series condensing units to provide a mains voltage alarm signal at terminal5 when the compressor trips.They may also be used as a spares replacement.

MCU, MCU+

R22 NOMINALSETTING (A)

R407C NOMINALSETTING (A) QTY DESCRIPTION

KIT No. KIT No.15 55000408 5.0 55000409 6.2 1 Overload

20 55000409 6.6 55000410 8.1 1 Pink Wire (98 - 5 or 2)30 55000409 7.4 55000410 9.2 1 Violet Wire (96 - A1)40 55000410 8.8 55000446 12.4 1 Black Wire (95 - 97)50 55000446 11.0 55000446 11.0 2 Cable Tie

60 55000446 12.5 55000446 12.555000446 14.0 55000446 15.0

80 55000446 14.0 55000449 15.090 55000449 20.0 55000449 20.0

ISOLATE THE UNIT ELECTRICALLY PRIOR TO INSTALLATION OF THE KIT/SPARE

SPARES REPLACEMENT:-The overload is a direct spare replacement. Set the overload to the original Amps setting and transfer all wires one at atime: maintain the same relative positions of wires and ensure that a black wire is connected between terminals 95 and97, using the supplied black wire if necessary. Discard other wires supplied in the kit. Check correct compressor rotationon 3Ø units.

KIT FITTING

1 Remove the front access panel (three screws) to reveal the electrics box.

2 Set the overload as close as possible to the nominal figures in the above table.

3 Locate the contactor and transfer the wires from terminals 2, 4 and 6 to the corresponding terminals on the overload,one terminal at a time.

4 Connect the pink wire supplied in the kit between terminal 5 on the terminal rail and overload terminal 98.

5 Remove the violet wire from contactor terminal A1 and reroute to overload terminal 95, also linking the black wire fromterminal 97 to terminal 95.

6 Secure the overload to the contactor by inserting the metal pins into vacant contactor terminals 2/4/6 and tighteningthe screws securely.

7 Connect the violet link wire from the kit between contactor terminal A1 and overload terminal 96.

8 Tidy wires using the cable ties supplied.

9 Press the large central red button to ensure that the overload is reset.

--o--o--O--O--O--o--o--



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DCUE OVERLOAD KITS 54000408 to 412

These kits are for use on all single phase 542 series ducted condensing units to provide an alarm signal when thecompressor trips. (This signal is used to operate the alarm LED on the indoor unit). They may also be used on ALLthree phase units as a spares replacement.

DCUE 1PH KIT 3PH SPARE ITEM QTY DESCRIPTION

10 54000409 -- 1 1 Overload15 54000409 -- 2 3 Cable Tie20 54000410 54000408 3 1 Violet Link Wire30 54000410 54000408 4 1 Pink Link Wire40 54000410 5400040950 54000410 5400040960 54000411 5400040980 54000411 54000409

Model Size (1Ph) 10 15 20 30 40 50 60 80Overload Setting (A) 5.0 6.1 8.0 9.0 11.0 12.0 14.0 16.0Model Size (3Ph spare) 10 15 20 30 40 50 60 80Overload Setting (A/Ph) -- -- -- 3.3 4.6 5.3 5.8 6.1

SPARES REPLACEMENT:-

When used as a spare, the overload is a direct replacement. Note the original setting of the existing overload, set thenew overload to this and transfer wires one at a time. Discard the additional violet link wire supplied in the kit.


1 Release the three retaining screws in the front access panel and remove to reveal the electrics box.

2 Locate the contactor and transfer the wires one at a time from terminals 2, 4 and 6 to the corresponding terminals onthe overload.

3 Secure the overload to the contactor by inserting the metal links into the three vacant contactor terminals and tightening the screws.

4 On electronic units, a pink wire is supplied with one end pre-connected to pin 2 of the 9 way plug. Remove the otherend from the parking terminal on the base of the electrics box, remove the in-line connector and strip back the wireby 8mm prior to connection to overload terminal 98. Discard the pink wire supplied in the kit.

5 Remove the violet wire from contactor terminal A1 and reroute to overload terminal 95.

6 Connect the violet link wire from the kit between contactor terminal A1 and overload terminal 96.

7 Tidy wires using the cable ties supplied.

--o--o--O--O--O--o--o--



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VOLT FREE RELAY KIT 55000405

This kit is for use on 550 series outdoor units and will provide a volt free alarm signal to other equipment.

ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION1 1 Relay 7* 1 Terminal 4 Way2 2 Screw No. 6 8* 1 End Plate3 1 Orange Wire 9* 2 Yellow Wire4 1 Blue Wire 10* 1 Terminal Marker 'A'5 1 Double Spade 11* 1 Terminal Marker 'B'6 3 Cable Tie * Items 7 to 11 are supplied sub


1 Release six retaining screws and remove the lid.

2 Release two retaining screws in the front access panel and remove.

3 On single fan units, release the retaining screw on the right hand side and remove themains terminal cover.

4 With relay terminals facing the left, secure the relay to the two holes inthe base of the electrics tray (below the contactor) (Fig. 1). Move the earth clips to the left if necessary.

5 Loosen the end clamp on the terminal rail and slide to create a gap. With the yellow wires uppermost, fit the four way terminal between the existing terminals and the end clamp.Slide the end clamp to close the gap and tighten the screw.

Fig.1.

VOLT FREE RELAY WIRING, (Fig. 2)

Note: Terminals 11 - 14 close on active alarm, terminals 21 - 22 open on active alarm.

6 Yellow wires:Connect from the 4 way terminal to the terminals on the relay (Fig. 3).

7 Orange wire:Connect from terminal 5 on the terminal block to terminal b (A2) on the relay.

8 Blue wire:Connect between terminal a (A1) on the relay and, using the double spade terminal, to the fan motor capacitor terminal with the blue wire(s) connected to it (blue and white wires on MCU without head pressurecontrol).

9 Secure the wires to the existing harness using cable ties.

11- 14 Contacts close on active alarm

21- 22 Contacts open on active alarm

Fig. 2. Fig. 3.(viewed from terminal end)

--o--o--O--O--O--o--o--



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DCUE DUCT KIT 532 00 402 to 403.

Item Qty Description Model Kit Number1 1 5m Duct 10 - 40 532004022 4 Jubilee Clip 50 - 80 53200403

Circular flexible ducting is supplied in 5 metre lengths and is of the pre-insulated type; (insulation is 40mm minimumthickness).Fixing spigots are supplied on the air on and air off faces of the unit. These spigots are 355mm (14") diameter formodels 10 to 40 and 406mm (16") diameter for models 50 to 80.The 4 jubilee clips are supplied loose but must be used in pairs. Fasten one end of a jubilee clip to another and securethe duct to the required, air on or air off, spigot. The remaining two clips should be used to secure the other end to aplenum, (if fitted).

APPLICATION RECOMMENDATIONS.

The flexible duct must be installed fully extended to produce optimum results.The maximum allowable sag, between any two adjacent suspension points, should not exceed 50mm per metre.Flexible ducts mounted above suspended ceilings should always be independently supported.Always make any bend radius as large as possible and never less than 0.8 times the duct diameter. Double bendsshould be avoided, however if unavoidable, ensure that each radius is not less than twice the duct diameter.Hanging straps should have a minimum of half the circumference in contact.Recommended minimum width for hanging straps is 25mm.

--o--o--O--O--O--o--o--

DCUE PLENUM KIT 532 00 405 to 406.

This kit may be used on Ducted Condensing Units.

Model Kit NumberDCUE 10 - 40 53200405DCUE 50 - 80 53200406

Calculations for plenum sizes have been based on a standard wall thickness of 300mm, see Fig.2.If the wall is 300mm or less, then it is possible to site the unit on wall mounting feet and slide the unit up to the plenumwithout the need for ducting, in this case the unit should be secured with Duct tape.If the wall is greater than 300mm thick then some form of ductwork will be required.

Fig.1. Air On/Off Spigot Centres.

A B C D EDCUE 10 - 40 316 716 355 274 --DCUE 50 - 80 391 865 406 274 --



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The plenums are also supplied to provide a transitional piece through a wall between ducting, (if used), and a grille. Theplenum spigots are 354mm (14") diameter for models 10 to 40 and 404mm (16") diameter for models 50 to 80.

Jubilee clips are supplied with the duct kit, (if applicable), and should be used in pairs to secure the duct to the plenum.

Fig.2. Depth of Plenum.

A B C D E FDCUE 10 - 40 112.5 385 290 600 172.5 240DCUE 50 - 80 125 430 330 640 195 240

Fig. 3. Plenum Dimensions.

If mounting the unit directly up to one or two plenums fitted through an adjacent wall, i.e., without ductwork, then refer tothe dimensions below. IMPORTANT: Remember that the following are internal dimensions before lining the holes withwood. IT WILL BE NECESSARY TO FIT AN INFILL PANEL BETWEEN THE TWO GRILLES.

HOLE REQUIRED - DOUBLE PLENUM KIT HOLE REQUIRED - SINGLE PLENUM KIT

For the distance from the horizontal centre line to the base of the mounting feet ADD 24mm to dimension 'C' for DCUE.

UNIT A B C D E FDCUE 10 - 40 770 550 250 185 400 370DCUE 50 - 80 894 590 250 210 474 420

--o--o--O--O--O--o--o--



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DCUE GRILLE KITS 53200420 and 53200421

This kit may be used on Ducted Condensing Units and Ducted Heat Pump Outdoor Units.

Model Kit NumberDCUE 10 - 40 53200420DCUE 50 - 80 53200421

The grille is supplied with a flange which slots inside the plenum, (if fitted); woodscrews should then be used to securethe plenum and the grille in place.

Model A B C D E F G HDCUE 10 - 40 226 595 520 335 620 400 85 265DCUE 50 - 80 251 630 560 380 655 445 95 265

--o--o--O--O--O--o--o--



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MCU(+) 15 - 100 COMPONENT IDENTIFICATION

1 Lid 13 Valve panel 25 End clamp2 Contactor 14 Base 26 Terminal (screw - screw )3 Overload 15 Mounting foot 27 Fuse4 Heat exchanger 16 LP switch 28 Fuse terminal5 Rear access panel 17 Compressor 29 Terminal (4 way)6 Mains terminal cover 18 Handle 30 Earth terminal7 Fan capacitor 19 Front access panel 31 Head pressure control pcb (MCU+)8 Bulkhead panel 20 Fan guard 32 3 minute timer pcb (MCU+)9 HP switch (manual, option) 21 Fascia panel 33 Compressor capacitor

10 Expansion assy (inc. restrictor) 22 Corner panel 34 Electrics box11 Service valve (liquid) 23 Support bracket12 Service valve (suction) 24 Fan / motor assy



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MCU(+) 130 - 200 COMPONENT IDENTIFICATION

1 Lid 13 Rear access panel 25 Front access panel2 Fuse terminal 14 Bulkhead panel 26 Fan guard3 Fuse 15 HP switch (manual: Accessory) 27 Fascia panel4 Terminal (screw - screw) 16 Expansion assembly 28 Corner panel5 Terminal (4 way) 17 Service valve (expansion) 29 Support bracket6 Contactor 18 Service valve (suction) 30 Fan motor assembly7 Earth terminal 19 Valve panel 31 Head pressure control pcb8 End clamp 20 Base 32 Power board (MHPUE)9 Overload 21 Mounting foot 33 3 minute timer pcb

10 Heat exchanger 22 LP switch 34 Compressor capacitor (1Ph)11 Fan capacitor 23 Compressor 35 Electrics box12 Mains terminal cover 24 Handle



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DCUE COMPONENT IDENTIFICATION

1 Lid 17 Water level sensor2 Fan assembly 18 Expansion assembly3 Panel right hand access 19 Service valve4 Accumulator 20 Panel electrics access5 Spire c lip 21 Handle6 Switch LP auto 22 Service valve7 Switch HP auto 23 Isolator8 Terminal 4 way 24 End clamp9 Terminal fused 25 Terminal

10 Compressor 26 Reversing valve (DHPUE)11 Crankcase heater 27 Solenoid12 Cover sump housing 28 Power board13 Condensate pump pcb 29 Overload (3ph)14 Condensate pump 30 Contactor15 Filter 31 Fan capacitor16 Condensate sump 32 Compressor capacitor (1ph)



TECHNICAL MANUAL for 550 SERIES CONDENSING UNITS … · TECHNICAL MANUAL for 550 SERIES CONDENSING...

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