Mitsubishi Electric PQHY-P120THMU-A, Service Handbook

Page: 69 / 414

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