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Transcript of Daikin Europe, Consulting sales section Learning, our way VRV III Product Selection Piping...
Daikin Europe, Consulting sales
section
D a i k i n E u r o p e A c a d e m y
Learning, our way
VRV III
Product SelectionPiping selection
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Selection Considerations• Cooling Load calculations
• Heating Load calculations
• Internal and Ambient temp
• Building layout drawings
• Orientation
• Room Usage
• Fresh Air Requirements
• Air and temperature distribution
• Noise Levels
• Pipe Runs
• Unit Dimensions
• Aesthetics
• Planning Restrictions
• Possible future site expansion
Total or sensible capacity selection ?
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Outdoor and Indoor Unit selection is based on using the capacity index
To select indoor unit and unit combinations,to size pipe work and refnet joints, we use ‘Index’ numbers:
For example the index no of FXZQ20M7V1B is 20
Indoor unit size Capacity index
20 20
25 25
32 31.25
40 40
50 50
63 62.5
80 80
100 100
125 125
140 140
200 200
250 250
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Maximum Number of Indoor Units Connected to One Outdoor UnitOutdoor untis Indoor units I.U combination index
Cooling only Heat pump Heat recovery Maximal connectable Mininum Maximum
VRV III VRV III VRV II For VRVIII For VRVII
- RXYSQ4P7V3B - 6 - 50 130
RXQ5P7W1B RXYSQ5P7V3B - 8 8 62,5 162,5
- RXYSQ6P7V3B - 9 - 70 182
RXQ8P7W1B RXYQ8P7W1(B) REYQ8M7W1B 22 13 100 260
RXQ10P7W1B RXYQ10P7W1(B) REYQ10M7W1B 25 16 125 325
RXQ12P7W1B RXYQ12P7W1(B) REYQ12M7W1B 30 19 150 390
RXQ14P7W1B RXYQ14P7W1(B) REYQ14M7W1B 36 20 175 455
RXQ16P7W1B RXYQ16P7W1(B) REYQ16M7W1B 40 20 200 520
RXQ18P7W1B RXYQ18P7W1(B) REYQ18M7W1B 44 20 225 585
- RXYQ20P7W1(B) REYQ20M7W1B 42 20 250 650
- RXYQ22P7W1(B) REYQ22M7W1B 47 20 275 715
- RXYQ24P7W1(B) REYQ24M7W1B 51 22 300 780
- RXYQ26P7W1(B) REYQ26M7W1B 53 32 325 845
- RXYQ28P7W1(B) REYQ28M7W1B 56 32 350 910
- RXYQ30P7W1(B) REYQ30M7W1B 60 32 375 975
- RXYQ32P7W1(B) REYQ32M7W1B 64 32 400 1040
- RXYQ34P7W1(B) REYQ34M7W1B 64 32 425 1105
- RXYQ36P7W1(B) REYQ36M7W1B 64 34 450 1170
- RXYQ38P7W1B REYQ38M7W1B 64 36 475 1235
- RXYQ40P7W1B REYQ40M7W1B 64 38 500 1300
- RXYQ42P7W1B REYQ42M7W1B 64 40 525 1365
- RXYQ44P7W1B REYQ44M7W1B 64 40 550 1430
- RXYQ46P7W1B REYQ46M7W1B 64 40 575 1495
- RXYQ48P7W1B REYQ48M7W1B 64 40 600 1560
- RXYQ50P7W1B - 64 - 625 1625
- RXYQ52P7W1B - 64 - 650 1690
- RXYQ54P7W1B - 64 - 675 1755
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Branch selector box
Total index
No of indoor units connectable
System type No of BS boxes connectable
R410a REYQ8M 13
REYQ10M 16
BSVQ100MVE Min – Max
20 - 100
8 REYQ12 – 20M 20
REYQ22M 22
BSVQ160MVE Min – Max
100 - 160
8 REYQ24 – 32M 32
REYQ34M 34
BSVQ250MVE Min – Max
160 – 250
5
Size 50 is the smallest to be
connected
REYQ35M 36
REYQ38M 38
REYQ40 – 48M 40
Maximum Number of Indoor Units Connected to BS Boxes (required for Heat Recovery Systems)
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Based on High Fan Speed
For “Low Fan” Speed, capacityreduction is not published, but the correction factors from next slide may be used.
FXCQ
Indoor unit Selection
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Correction factors to calculate the unit 's capacity at low fan tap.
Class
Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating20 81% 77% 86% 83% 85% 82% 81% 78%25 81% 78% 86% 83% 85% 82% 88% 86% 81% 78%32 81% 78% 86% 84% 85% 82% 88% 86% 82% 79%40 83% 81% 82% 79% 82% 79% 85% 82% 86% 83%50 83% 81% 81% 77% 79% 75% 82% 79%63 86% 84% 84% 81% 89% 88% 83% 79%80 88% 85% 83% 81% 87% 85%
100 88% 85% 86% 84%125 84% 81% 87% 85% 82% 79%
Class
Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating20 71% 66% 91% 89% 91% 89%25 73% 68% 91% 89% 91% 89%32 89% 88% 72% 67% 83% 81% 83% 81%40 89% 87% 83% 81% 85% 83% 85% 83%50 89% 87% 87% 85% 86% 84% 86% 84%63 89% 87% 87% 85% 82% 79% 83% 81% 83% 81%80 89% 87%
100 87% 84% 86% 83%125 88% 85%200 91% 90%250 91% 90%
Correction factor
Correction factor Correction factor Correction factor Correction factor Correction factor
Correction factor Correction factor Correction factor Correction factorFXSQ-M
FXMQ-M FXHQ-M FXAQ-M FXLQ-M FXNQ-M
FXCQ-M FXZQ-M FXFQ-M FXKQ-M
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Select indoor units for room layout provided
Starting from Engineering data book EEDE06-2 page 795:Noise Levels details Engineering data book EEDE06-2 page 815Unit Dimensions Engineering data book EEDE06-2 page 798Air Distribution Engineering data book EEDE06-2 page 818
Make a record of Model, Fan speed, Total and Sensible Cooling duties
“Example (FXCQ) of where information can be found”
Indoor Unit Selection
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Room A - General OfficeRoom B - Meeting RoomRoom C - ManagerRoom D - Small officeRoom E - Reception
3 m 3 m
N
Room A8.0kw Sensible Cooling
Room B4.2 kw Sensible
Room C2.1 kw
Sensible
Room D2.5 kw
Sensible
Room E1.65 kwSensible
18 m
6 m
6 m
6 m3 m
3 m
Rooms A, B and E 400mm ceiling voidRoom C 200 mm ceiling voidRoom D no void (restricted floor space)Ceiling Height 2.7m
Internal design 23 deg C db 16 deg C wb
Ambient design 29 deg C db
Indoor Unit Selection
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Possible Solution
Note: The low speed duties were calculated based on the correction factors shown in the previous table.
Required Sensible
Total Sensible
Room A 3 x FXFQ40M 8.0 kW High Speed 10.8 kW 9.0 kW
Room B 1 x FXSQ80M 4.2 kW Low Speed 5.97 kW 4.73 kW
Room C 1 x FXLQ40M 2.1 kW Low Speed 3.06 kW 2.3 kW
Room D 1 x FXAQ40M 2.5 kW High Speed 3.60 kW 3.31 kW
Room E 1 x FXSQ32M 1.65 kW Low Speed 2.31 kW 1.88 kW
Indoor Unit Selection
Internal design 23 deg C db 16 deg C wb
Ambient design 29 deg C db
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Condensing Unit Selection Considerations
• Remember the maximum index connectable
• Remember the maximum number of indoor units
• Cooling Only, Heat Pump or Heat Recovery
• Positioning
• Noise levels
• Service Access space required
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6 m3 m
Room A
Room BRoom C
Room DRoom E
18 m
6 m
6 m
3 m
Condensing Unit Base
FXFQ40M FXFQ40M FXFQ40M
FXSQ80MFXLQ40M
FXAQ40MFXSQ32M
Condensing Unit Selection
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Condensing Unit Selection
Example: using Inverter 2 pipe Heat Pump
Room A 3 x FXFQ40M 120Room B 1 x FXSQ80M 80Room C 1 x FXLQ40M 40Room D 1 x FXAQ40M 40Room E 1 x FXSQ32M 31.25Total Index 311.25
Suitable Condensing UnitRXYQ10P7W1
OutdoorUnit
Indoor Unit Combination Index
Minimum Maximum
RXYQ5P7W1RXYQ8P7W1/REYQ8MRXYQ10P7W1/REYQ10M
62.5100125
162.5260325
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Room A 3 x FXFQ40M 120Room B 1 x FXSQ80M 80Room C 1 x FXLQ40M 40Room D 1 x FXAQ40M 40Room E 1 x FXSQ32M 31.25Total Index 311.25
Suitable Condensing UnitRXYQ10P7W1
Look up condensing unit duty from EEDE06–2 page 196At indoor temperature of 16 deg C wb and outdoor temp 29 deg C dbTotal Cooling with index of 308 = 24,8 kWTotal Cooling at index of 336 = 27.0 kWIndex connected = 336 – 311.25 = 24.7527,0 kW – 24,8 = 2.2 kW336 – 308 = 282.2 kW/28 = 0.0785 kW24.75 x 0.0785 = 1.944 kW
Condensing Unit Selection
Example: using Inverter 2 pipe heat pump
27.0 kW – 1.944 kW= 25.055 kW
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Condensing Unit SelectionExample: using Inverter 2 pipe heat pump (Back to the original data selected at high speed)
Calculate corrected indoor unit capacityRXYQ10M total cooling = 25.05kWFXFQ40M = (40 x 25.05) = 3.22 kW total
311. 25Reduce sensible by the same proportion prior to correction calculation Don’t forget to apply correction for low speed when necessary:FXSQ80 = (80 x 25.05) x 0.87 = 5,60 kW total 311.25FXSQ80 = 4.73 x 5,60 = 4.44 kW sensible 5.97
Corrected
Index Total Sensible Total Sensible
Room A = 3 x FXFQ40M (high speed) 120 10.80kW 9.0kW 9,66kW 8,04kW
Room B = 1 x FXSQ80M (low speed) 80 5.97 kW 4.73 kW 5,60 kW 4.44kW
Room C = 1 x FXLQ40M (low speed) 40 3.06 kW 2.3kW 2.73 kW 2.05kW
Room D = 1 x FXAQ40M (high speed) 40 3.6kW 3.3Kw 3.22Kw 2.96Kw
Room E = 1 x FXSQ32M (low speed) 31.25 2.37kW 1.88kW 2.08kW 1.69 kW
Total index 311.25
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Example: using Inverter 2 pipe heat pump
Not yet ?
Condensing Unit Selection
Are we finished ?
Required
Sensible
Corrected
Total Sensible
Room A = 3 x FXFQ40M 8.0 kW High Speed 9,66kW 8,04kW
Room B = 1 x FXSQ63M 4.2 kW Low Speed 5,60 kW 4.44kW
Room C = 1 x FXLQ40M 2.1 kW Low Speed 2.73 kW 2.05kW
Room D = 1 x FXAQ40M 2.5 kW High Speed 3.22Kw 2.96Kw
Room E = 1 x FXSQ25M 1.65 kW Low Speed 2.08kW 1.69 kW
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Example: using Inverter 2 pipe heat pump
Table RXYQ10P
For Room B FXSQ80MRun = 20mLevel difference = Outdoor unit 3m below indoor unit
Capacity reduction factor = 0.98
Look up capacity correction ratio on page 294 of EEDE06-2
Pipe Length Correction
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6 m3 m
Room A
Room BRoom C
Room DRoom E
18 m
6 m
6 m
3 m
Condensing Unit Base
FXSQ80M
FXAQ40MFXSQ32M
FXFQ40M FXFQ40M FXFQ40M
FXLQ40M
Pipe Length Correction
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Outdoor situated below
Indoor units(H=m)
(Change in Cooling Capacity)
0
0
Outdoor situated above
Indoor units
10
20
30
40
50
10
20
30
40
0 10
20
30
40
50
60
70
80
90
(H=m)
0.870.90
0.92
0.98
Example:
0.92 0.850.90 0.87
1.0
0.95
0.98
Outdoor unit 3m belowIndoor unit
100 110
0.85
0.95
1.0
Pipe Length Correction
……..190 m
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Pipe Length Correction
Example: using Inverter 2 pipe heat pump
Corrected Pipe length Correction factor required
Pipe length corrected
Total Sensible Total Sensible
Room A = 1 x FXFQ40M
= 1 x FXFQ40M
= 1 x FXFQ40M
9,66kW 8,04kW 15M
11M
7M
0.99
0.99
0.99
3,18kW
3,18kW
3,18kW
2.66kW
2.66kW
2.66kW
Room B = 1 x FXSQ80M 5,60 kW 4.44kW 20M 0.98 5,49kW 4.35kW
Room C = 1 x FXLQ40M 2.73 kW 2.05kW 16M 0.98 2,68kW 2.02kW
Room D = 1 x FXAQ40M 3.22Kw 2.96Kw 10M 0.99 3.18kW 2,93kW
Room E = 1x FXSQ32M 2.08kW 1.69 kW 4M 1.00 2.06kW 1.67kW
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Defrost operation protects the outdoor unit coil against freezing:
• Happens in heating mode
• Performs once max every 2 hours
• Duration: between 4 and 8 min
• During defrost: outdoor/indoor units’ fans are stopped
• No heating is delivered during defrost
• Limited cooling is delivered (heat recovery models)
• Capacity tables do not take account of this capacity reduction
• The heating capacity should be ammended by a correction factor:
Additional correction due to Defrost operation
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Example: using Inverter 2 pipe heat pump
If selected fan coil unit corrected duty is too low, then that unit has to be re-selected and the complete procedure repeated
Summary of selection after corrections
Room A = 3 x FXFQ40M 8.0 kW High Speed 10,66kW 8,04kW
Room B = 1 x FXSQ80M 4.2 kW Low Speed 5,49kW 4.35kW
Room C = 1 x FXLQ40M 2.1 kW Low Speed 2,68kW 2.02kW
Room D = 1 x FXAQ40M 2.5 kW High Speed 3.18kW 2,93kW
Room E = 1 x FXSQ32M 1.65 kW Low Speed 2.06kW 1.67kW
Required sensible
Result total
Result sensible
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Would this suit Heat Recovery?
Room A
Room BRoom C
Room DRoom E
FXSQ80M
FXSQ32M
Meeting Room
FXFQ40M FXFQ40M FXFQ40M
FXLQ40M
FXAQ40M
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Room A
Room BRoom C
Room DRoom E
Condensing Unit Basewith REYQ10M
FXFQ40M FXFQ40M FXFQ40M
FXSQ80MFXLQ40M
FXSQ32M
BS Box
FXAQ40M
VRVII Heat Recovery: selection of BS Boxes
BSVQ100MVE Min – Max
20 - 100
BSVQ160MVE Min – Max
100 - 160
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VRV III “P7” Series
Selection byVRV Express
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VRV Express
VRV Selection SoftwareVRV Selection Software
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VRV Express
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VRV Express
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VRV Express
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VRV Express
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Material list
Model Qty Description
REYQ12M 1 Heat recovery VRV M R410A
REYQ8M 1 Heat recovery VRV M R410A
BSVQ100M 4 Branch selector unit R410A
BSVQ160M 3 Branch selector unit R410A
FXAQ40M 1 A - Wall mounted unit
FXFQ50M 2 F - 4-way blow ceiling mounted cassette
FXFQ80M 2 F - 4-way blow ceiling mounted cassette
FXSQ40M 2 S - Concealed ceiling mounted
FXSQ80M 3 S - Concealed ceiling mounted
KHRQ22M20T7 3 REFNET branch piping kit
KHRQ23M29T7 4 REFNET branch piping kit
KHRQ23M64T7 1 REFNET branch piping kit
DCS601A51 1 I controller
BRC1D517 8 Wired remote control
BYC125KJW1 4 Decoration panel
VRV Express
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Name Model Tmp C Rq TC
Av TC Rq SC Av SC Tmp
H Rq HC
Av HC
Airflow Soun
d MCA
WxHxD Wght
°C kW kW kW kW °C kW kW l/s dBA A mm kg
First Floor - Room 101 FXFQ50M 22.0 4.0 4.9 3.5 3.8 21.0 2.0 4.5 183-267 27-32 0.3 840x246x840 24
First Floor - Room 102 FXFQ50M 22.0 4.0 4.9 3.5 3.8 21.0 2.0 4.5 183-267 27-32 0.3 840x246x840 24
First Floor - Room 103 FXFQ80M 22.0 5.5 7.8 4.9 5.5 21.0 3.2 7.1 250-333 31-36 0.5 840x246x840 25
First Floor - Room 104 FXFQ80M 22.0 5.5 7.8 4.9 5.5 21.0 3.2 7.1 250-333 31-36 0.5 840x246x840 25
First Floor - Room 105 FXSQ80M 22.0 5.5 7.8 4.9 6.2 21.0 3.2 7.1 358-450 37-43 1.4 1400x300x800 51
First Floor - Room 106 FXSQ40M 22.0 3.0 3.9 2.5 2.9 21.0 2.0 3.5 150-192 32-38 0.6 700x300x800 30
Second Floor - Room 201 FXSQ40M 22.0 3.0 3.7 2.5 2.8 21.0 2.0 3.6 150-192 32-38 0.6 700x300x800 30
Second Floor - Room 203 FXSQ80M 22.0 6.0 7.5 5.2 6.0 21.0 4.5 7.2 358-450 37-43 1.4 1400x300x800 51
Second Floor -Room 204 FXSQ80M 22.0 6.0 7.5 5.2 6.0 21.0 4.5 7.2 358-450 37-43 1.4 1400x300x800 51
Second Floor - Room 205 FXAQ40M 22.0 3.0 3.7 2.5 2.9 21.0 1.8 3.6 150-200 34-39 0.4 1050x290x230 14
Indoor unit details
VRV Express
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VRV III “P” Series
Field Pipe work - Application
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REFNET headerREFNET headerREFNET jointREFNET joint
VRV refrigerant piping system is based on REFNETS
Advantages of REFNET system: Short dimensioning time
Short installation time
NEVER install a joint after a header !
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+30°
Joints are to be mounted …. Vertically
…..Horizontally
Refnet installation recommendations
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Adjust the pipe sizeaccording to the capacity
Possibly
match pipe and refnet
using adaptors
prototypes
REFNET piping system
Select refnets according to the capacity
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Refrigerant Pipe Work Maximum “Actual” Piping Limitations
165M90M
40M
For level differences above 50m;
• One size up of main liquid pipe
• Option kit
•Total piping length = 1000M•No Oil traps•No Liquid traps•No Solenoid valves•No Sight glasses•No Driers•No Additional oil•Max pressure test 38.5 bar
190MMax
EQUIVALENT LENGTH
15M
A
A
Can become 90 m in certain conditions
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Field Piping Limitations VRV III P series (Heat pump Inverter)
FXHQ….M FXCQ….M FXCQ….M FXSQ….M FXAQ….M
FXLQ….M FXLQ….M FXLQ….M
RXYQ…P
15m
165m
90m
40m
NEVERINSTALL A
JOINT AFTERA HEADER
edcb
a
lh j kf g n
m
1. “Longest” – “shortest” branch = b+c+d+e+l-f <=40m
2. f, g,h, j, k, l, m, n <= 40m
3. Pipes b, c, d, e between first and last kit are sized up
4. For the total piping calculation the actual length of b, c, d, e is counted double
90m
Can
be
if
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VRVII “M” Series Field Piping Limitations (Heat Recovery)
FXHQ….M FXCQ….M FXCQ….M FXSQ….M
REYQ….M
50m
150m
FXLQ….MFXLQ….MFXLQ….M
15m
FXLQ….M FXLQ….M
BSVQ. .M
40M
BSVQ. .M BSVQ. .M BSVQ. .M BSVQ. .M BSVQ. .M BSVQ. .M
BSVQ. .M
BSVQ. .M
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Piping joints required at the first branch
Refnet joints for 2 pipe Outdoor system type
KHRQ22M20T RX(Y)Q5
KHRQ22M29T9 RX(Y)Q8~10
KHRQ22M64T RX(Y)Q12~18 + RXYQ20~22
KHRQ22M75T RXYQ24~54
Refnet joints for 3 pipe Outdoor system type
KHRQ23M29T7 REQY8 – 10
KHRQ23M64T7 REYQ12 – 22
KHRQ23M75T7 REYQ24>
VRV III
VRV II H/R
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Piping Joints other than the first branch
Refnet joints for 2 pipe Connectable index
KHRQ22M20T <200
KHRQ22M29T9 200 - <290
KHRQ22M64T 290 - <640
KHRQ22M75T >640
Refnet joints for 3 pipe Connectable index
KHRQ23M20T7 <200
KHRQ23M29T7 200 - <290
KHRQ23M64T7 290 - <640
KHRQ23M75T7 640>
VRV III
VRV II H/R
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1st joint corresponds to outdoor unit
2nd Joint according to class total
Possibly, this results into a bigger joint than the 1st joint !
Selection of Piping Joints
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Refnet header for 2 pipe Connectable index
KHRQ22M29H <290
KHRQ22M64H 290 - <640
KHRQ22M75H 640>
Refnet header for 3 pipe Connectable index
KHRQ23M29H7 <200
KHRQ23M29H7 200 - <290
KHRQ23M64H7 290 - <640
KHRQ23M75H7 640>
PLEASE NOTE :
Class 250 CANNOT
be connected
to a header
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Pipe Size connections to the outdoor units Heat Pump model
Outdoor model Gas pipe Liquid pipe
RX(Y)Q5 15.9mm 9.5mm
RX(Y)Q8 19.1mm 9.5mm
RX(Y)Q10 22.2mm 9.5mm
RX(Y)Q12, 14, 16 28.6mm 12.7mm
RX(Y)Q18 +RXYQ20-22
28.6mm 15.9mm
RXYQ24 34.9mm 15.9mm
RXYQ26-34 34.9mm 19.1mm
RXYQ36-54 41.3mm 19.1mm
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Pipe Sizing between refnet branch kits for heat pump models
Total unit capacity
Gas
(outer diameter)
Liquid
(outer diameter)
<150 15.9mm 9.5mm
150-->200 19.1mm 9.5mm
200 - >290 22.2mm 9.5mm
290 - <420 28.6mm 12.7mm
420 - <640 28.6mm 15.9mm
640 - <920 34.9mm 19.1mm
>920 41.3mm 19.1mm
Piping
Adjust the pipe sizeaccording to the capacity
Possibly, this results into a bigger pipe than the one coming from the
outdoor unit !
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Learning, our wayRefrigerant pipe Size Connections to Indoor Units
Total indoor unit capacity Gas Liquid
20, 25, 32, 40, 50 12.7mm 6.4mm
63, 80, 100, 125 15.9mm 9.5mm
200 19.1mm 9.5mm
250 22.2mm 9.5mm
Please note: all the above connections are flared other than the gas pipe connection on the 200 an 250 models being brazed style
The pipe size ofthe indoor unit
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Pipe Sizing between refnet branch kits for Heat recovery
Total unit capacity Gas Discharge Liquid
<63 12.7mm 9.5mm 6.4mm
63 - <200 15.9mm 12.7mm 9.5mm
200 - <290 22.2mm 19.1mm 9.5mm
290 - <420 28.6mm 19.1mm 12.7mm
420 - <640 28.6mm 28.6mm 15.9mm
640 - <920 34.9mm 28.6mm 19.1mm
>920 41.3mm 28.6mm 19.1mm
Outdoor model Gas pipe Liquid pipe Discharge pipe
REYQ8 19.1mm 9.5mm 15.9mm
REYQ10 22.2mm 9.5mm 19.1mm
REYQ12 28.6mm 12.7mm 19.1mm
REYQ14, 16 28.6mm 12.7mm 22.2mm
Pipe Size connections to the outdoor units for Heat recovery
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Equivalent length = a reference for a pressure drop of an component in the pipe work = length of linear pipes + allowances for fittings
Branch selector box = 4m
Refnet header = 1m
Refnet joint = 0.5m
41.3mm 1 – 5/5 bend = 0.7m
34.9mm 1 – 3/8 bend = 0.66m
28.mm 1 – 1/8 bend = 0.5m
22.2mm 7/8 bend = 0.4m
19.1mm 3/4 bend = 0.25m
12.7mm 1/2 bend = 0.22m
9.5mm 3/8 bend = 0.18m
The following allowances should be allocated to the following components:
=(Equivalent length of main pipe work x 0.5) + Equivalent length of branch pipe work
Overall Equivalent length =
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Increase only gas forIncrease only gas for
RX(Y)Q5P7RX(Y)Q5P7
Increase only liquid forIncrease only liquid for
RXYQ12,14,24, 36~54 PRXYQ12,14,24, 36~54 P
REYQ : REYQ : The WHOLE RANGEThe WHOLE RANGE
Increase diameter of the Liquid
AND the Gas pipes between
the condenser and the first refnet
What happens when the overall equivalent length from the condensing unit to any indoor unit exceeds 90 m ?
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Equivalent length 80m
E. Length 40m
Section to be increased in size
Equivalent length 110m
E. Length 40m
Section to be increased in size
(110m x 0.5)Overall Equivalent length = + = 95m 40m(An increase in main pipe work size is required)
(80m x 0.5)Overall Equivalent length = + = 80m 40m (No increase in pipe size required)
Equivalent length: example of calculation
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Piping Between modules forming a Condensing unitHeat pump (P7 series)
To indoor units
= Liquid Line= Gas Line
No oil equalization line required for P7 models
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To indoor units
= ¼” (6.4mm) Oil Equalising Line (only for REYQ18 or more)= Liquid Line= Gas Line= Discharge Line
Piping Between modules forming a Condensing unitHeat recovery (M series)
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AB
C
A
B
C
Branch Maximum pipe length
10m (13 m equiv.) or less
10m (13 m equiv.) or less
10m (13 m equiv.) or less
Pipe limitations between modules forming a Condensing unit
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Heat pump branch kit
Two unit connection kit BHFQ22P1007
Three unit connection kit BHFQ22M1517
Heat recovery branch kit
Two unit connection kit KHFQ23M907
Three unit connection kit BHFQ23M1357
Pipe Sizing Between Outdoor Units
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Pipe Sizing Between Outdoor Units VRVIII
~ 54
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Pipe Sizing Between Outdoor Units VRVII H/R
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TOTAL 22.2 = x 0.37 = +
TOTAL 19.1 = x 0.26 =+
TOTAL 15.9 = x 0.18 = +TOTAL 12.7 = x 0.12 = +TOTAL 9.5 = x 0.059 = +TOTAL 6.4 = x 0.022 =
Additional Refrigerant Charge Calculation for VRVIII takes in consideration the total lengths of liquid piping (m)
= R (additional kg R410)
R should be rounded off in units of 0,1 kg
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TOTAL 22.2 = x 0.35 = +
TOTAL 19.1 = x 0.25 =+
TOTAL 15.9 = x 0.17 = +TOTAL 12.7 = x 0.11 = +TOTAL 9.5 = x 0.054 = +TOTAL 6.4 = x 0.022 =
Additional Refrigerant Charge Calculation for VRVII H/R takes in consideration the total lengths of liquid piping (m)
x 1.15
0 kg (8-16 HP)
3 kg (18-32 HP)
6 kg (34-48 HP)
R=
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R_____ M
15m
4032 25 4080 40
40 40 40
C D E
M N O
SR T
4 I 4
P Q
B
VU X YW
Z
AABCDE
F
SUCTION DISCHARGE LIQUID
L
MNOPQ
RS
SUCTION LIQUID
U
WV
G
H
XY
Z
G
1
K
L
I
JK
T
1 2 3 4 5
6
12 3
45
6
BRANCHSELECTOR BOX JOINT HEADER
ADDITIONAL REFRIGERANT CHARGE CALCULATION
TOTAL 12.7 = X 0.11 = + TOTAL 9.5 = X 0.054 = + TOTAL 6.4 = X 0.022 =
A
F
1
1
K
1 1 6 1
6
H
6 J
2
T
2
L
15 5
10 10 6
2
6
No additional oil required!
Example of centralizing table
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Minimum thickness
Size t(mm)
ø O 0,80
ø O 0,80
ø12,7 O 0,8
ø15,9 O 0,99
ø19,1 1/2H 0,80
ø28,6 1/2H 0,99
ø34,9 1/2H 1,21
ø41,3 1/2H 1,43
R-410Amaterial
ø22,2 1/2H 0,80
“The material, wall thickness,tensile strength, ductility,
corrosion resistance, formingand testing methods shall be
suitable for the refrigerantused and withstand the
pressure and stresses whichmay occur”
The same requirements are validfor refnet headers and joints
The maximum working pressure for R-410A VRV P-series is 38 bar
O : Annealed½ H: Half HardFor half hard pipes the maximum allowed tensile stress is 61N/mm² for this reason, the 0.2% proof strength of the half hard pipe shall beminimum 61N/mm²The bending radius is more or equal to 3 times the diameter of the pipe
C1220-
Piping material