Mitsubishi Electric PQHY-P120THMU-A, Service Handbook

Page: 77 / 414

[
II
Restrictions ]
- 68 - HWE09080 GB
2. Refrigerant pipe size <PQRY>
(1) Between heat source unit and the first twinning pipe (Part A)
(2) Between BC controller and indoor unit (Sections a, b, c, d, e, and f )
(3) Between the main and sub BC controllers (Section C)
Select the proper size pipes for the main unit based on the total capacity of the indoor units that are connected to both sub
BC controllers. Select the proper size pipes for the sub controller side based on the total capacity of the indoor units that are
connected to the sub controller.
Unit : mm [inch]
Heat source unit
Refrigerant pipe size Connection to heat source unit and BC control-
ler
Low-pressure pipe High-pressure pipe Low-pressure pipe High-pressure pipe
P72 ø19.05 [3/4"] ø15.88 [5/8"] ø19.05 [3/4"] ø15.88 [5/8"]
P96
ø22.2 [7/8"] ø19.05 [3/4"] ø22.2 [7/8"] ø19.05 [3/4"]
P120
P144
ø28.58 [1-1/8"]
ø22.2[7/8"]
ø28.58 [1-1/8"]
ø22.2 [7/8"] P168
P192
P216
ø28.58 [1-1/8"] ø28.58 [1-1/8"]
P240
Unit : mm [inch]
Indoor unit
Refrigerant pipe size Indoor unit connection
(Flare connection for all models)
Liquid pipe Gas pipe Liquid pipe Gas pipe
P06, P08, P12, P15, P18 ø6.35 [1/4"] ø12.7 [1/2"] ø6.35 [1/4"] ø12.7 [1/2"]
P24, P27, P30
ø9.52 [3/8"] ø15.88 [5/8"] ø9.52 [3/8"] ø15.88 [5/8"]
P36, P48, P54
P72
ø12.7 [1/2"]
ø19.05 [3/4"]
ø12.7 [1/2"]
ø19.05 [3/4"]
P96 ø22.2[7/8"] ø22.2[7/8"]
Unit : mm [inch]
Indoor unit
Refrigerant pipe size (Brazed connection on all models )
Liquid pipe High-pressure gas pipe Low-pressure gas pipe
- P72
ø9.52 [3/8"]
ø15.88 [5/8"] ø19.05 [3/4"]
P73 - P108
ø19.05 [3/4"]
ø22.2 [7/8"]
P109 - P126
ø12.7 [1/2"]
ø28.58 [1-1/8"] P127 - P144
ø22.2 [7/8"]
P145 - P168 ø15.88 [5/8"]