GB
GB-17
WT07828X01
Pipes A, A
1
, A
2
[mm (in)]
Unit model
Combination unit
Pipe A
Pipe A
1
*
1
Pipe A
2
*
1
Unit 1
Unit 2
High-pressure
Low-pressure
High-pressure
Low-pressure
High-pressure
Low-pressure
P72ZKMU
-
-
ø15.88 (5/8)
ø19.05 (3/4)
-
-
-
-
P96ZKMU
-
-
ø19.05 (3/4)
ø22.2 (7/8)
-
-
-
-
P120ZKMU
-
-
ø19.05 (3/4)
ø28.58 (1-1/8)
-
-
-
-
P144ZKMU
-
-
ø22.2 (7/8)
ø28.58 (1-1/8)
-
-
-
-
P168ZSKMU
P96
P72
ø22.2 (7/8)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø22.2 (7/8)
ø15.88 (5/8)
ø19.05 (3/4)
P192ZSKMU
P96
P96
ø22.2 (7/8)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø22.2 (7/8)
ø19.05 (3/4)
ø22.2 (7/8)
P216ZSKMU
P120
P96
ø28.58 (1-1/8)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø22.2 (7/8)
P240ZSKMU
P120
P120
ø28.58 (1-1/8)
ø34.93 (1-3/8)
ø19.05 (3/4)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø28.58 (1-1/8)
P264ZSKMU
P144
P120
ø28.58 (1-1/8)
ø34.93 (1-3/8)
ø22.2 (7/8)
ø28.58 (1-1/8)
ø19.05 (3/4)
ø28.58 (1-1/8)
P288ZSKMU
P144
P144
ø28.58 (1-1/8)
ø34.93 (1-3/8)
ø22.2 (7/8)
ø28.58 (1-1/8)
ø22.2 (7/8)
ø28.58 (1-1/8)
*1 If the combination units 1 and 2 are in a different order as listed in the table, make sure to use the pipes of appropriate size for the situation.
Pipe B
[mm (in)]
Total capacity of indoor units
Pipe
Liquid
Gas
30 or below
ø9.52 (ø3/8)
ø15.88 (ø5/8)
Pipes C, D, E
[mm (in)]
Total model number of downstream
indoor units
Pipe
High-pressure
Low-pressure
Liquid
72 or below
ø15.88 (ø5/8)
ø19.05 (ø3/4)
ø9.52 (ø3/8)
73 to 108
ø19.05 (ø3/4)
ø22.2 (ø7/8)
ø9.52 (ø3/8)
109 to 126
ø19.05 (ø3/4)
ø28.58 (ø1-1/8)
ø12.7 (ø1/2)
127 to 144
ø22.2 (ø7/8)
ø28.58 (ø1-1/8)
ø12.7 (ø1/2)
145 to 168
ø22.2 (ø7/8)
ø28.58 (ø1-1/8)
ø15.88 (ø5/8)
Pipes a,b,c,d,e,f
[mm (in)]
Capacity index of indoor unit
Pipe
Liquid
Gas
06, 08, 12, 15, 18
ø6.35 (ø1/4)
ø12.7 (ø1/2)
24, 27, 30, 36, 48, 54
ø9.52 (ø3/8)
ø15.88 (ø5/8)
72
ø9.52 (ø3/8)
ø19.05 (ø3/4)
96
ø9.52 (ø3/8)
ø22.2 (ø7/8)
Pipes g, h, i, j
[mm (in)]
Capacity index of indoor unit
Liquid pipe
Gas pipe
g
h
i
j
36
ø9.52 (ø3/8)
ø9.52 (ø3/8)
ø15.88 (ø5/8)
ø15.88 (ø5/8)
48
ø9.52 (ø3/8)
ø9.52 (ø3/8)
ø15.88 (ø5/8)
ø15.88 (ø5/8)
54
ø9.52 (ø3/8)
ø9.52 (ø3/8)
ø15.88 (ø5/8)
ø15.88 (ø5/8)
72
ø9.52 (ø3/8)
ø9.52 (ø3/8)
ø19.05 (ø3/4)
ø15.88 (ø5/8)
96
ø9.52 (ø3/8)
ø9.52 (ø3/8)
ø22.2 (ø7/8)
ø15.88 (ø5/8)
9-5. Piping connections and valve operations
Before heating the brazed sections, remove the gas and oil that are trapped in the pipes.
- Failure to do so may generate fire, resulting in serious injury.
Ventilate the room while servicing the unit.
- If the refrigerant leaks, oxygen deficiency may result. If the leaked refrigerant comes in contact with a heat source,
toxic gas will be generated.
Store pipes indoors, and keep both ends of the pipes sealed until just before making a flare connection or
brazing. (Store elbows and other joints in plastic bags.)
- If dust, dirt, or water enters the refrigerant lines, the refrigerant oil will deteriorate and the compressor will
malfunction.
Keep the service valves closed until refrigerant charging is completed.
- Failure to do so will damage the unit.
Place a wet towel on the service valves before brazing the pipes to keep the temperature of the valves from
rising above 120ºC (248ºF).
- Failure to do so may result in equipment damage.
