Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 69

[ II Restrictions ]
1. Refrigerant pipe size <PQHY>
(1) Diameter of the refrigerant pipe between the heat source unit and the first branch (heat source unit pipe size)
Heat source unit set
name
P72 model
P96 model
P120 model
P144 model
P168 - 240 model
P264 - 312models
P336- 360 models
*1. Use ø12.7 [1/2"] pipes if the piping length exceeds 90 m [295 ft].
*2. Use ø12.7 [1/2"] pipes if the piping length exceeds 40 m [131 ft].
(2) Size of the refrigerant pipe between the first branch and the indoor unit (indoor unit pipe size)
Indoor unit model Pipe diameter (mm) [inch]
06 - 15 models Liquid pipe
Gas pipe
18 - 54 models Liquid pipe
Gas pipe
72 model Liquid pipe
Gas pipe
96 model Liquid pipe
Gas pipe
(3) Size of the refrigerant pipe between the branches for connection to indoor units
Total capacity of the
downstream units
- 54
P55 - P72
P72 - P108
P109 - P144
P145 - P240
P241 - P308
P309 -
(4) Size of the refrigerant pipe between the first distributor and the second distributor
Liquid pipe size (mm) [inch]
ø19.05 [3/4"]
HWE09080
Liquid pipe size (mm) [inch]
ø9.52 [3/8"]
*1
ø9.52 [3/8"]
*2
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø19.05 [3/4"]
ø6.35 [1/4"]
ø12.7 [1/2"]
ø9.52 [3/8"]
ø15.88 [5/8"]
ø9.52 [3/8"]
ø19.05 [3/4"]
ø9.52 [3/8"]
ø22.2 [7/8"]
Liquid pipe size (mm) [inch]
ø9.52 [3/8"]
ø9.52 [3/8"]
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø19.05 [3/4"]
Gas pipe size (mm) [inch]
ø34.93 [1-3/8"]
Gas pipe size (mm) [inch]
ø19.05 [3/4"]
ø22.2 [7/8"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
ø41.28 [1-5/8"]
Gas pipe size (mm) [inch]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
ø41.28 [1-5/8"]
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