Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 78

[ II Restrictions ]
2. Refrigerant pipe size <PQRY>
(1) Between heat source unit and the first twinning pipe (Part A)
Heat source unit
P72
P96
P120
P144 - P192
P216
P240
P288 - P312
P336
*1. When the piping length exceeds 65 meters [213 ft], use ø28.58 [1-1/8"] pipes for the sec-
tion of the piping that exceeds 65 meters.
(2) Between BC controller and indoor unit (Sections a, b, c, d, e, and f )
Indoor unit
P06, P08, P12, P15, P18
P24, P27, P30
P36, P48, P54
P72
P96
(3) Between the main and sub BC controllers (Section C)
Indoor unit
- P72
P73 - P108
P109 - P126
P127 - P144
P145 - P168
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.
HWE15150
Refrigerant pipe size
High-pressure pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2[7/8"]
*1
ø22.2[7/8"]
ø28.58 [1-1/8"]
Refrigerant pipe size
Liquid pipe Gas pipe
ø6.35 [1/4"] ø12.7 [1/2"]
ø9.52 [3/8"] ø15.88 [5/8"]
ø19.05 [3/4"]
ø9.52 [3/8"]
ø22.2[7/8"]
Refrigerant pipe size (Brazed connection on all models )
Liquid pipe High-pressure gas pipe
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
- 69 -
Unit : mm [inch]
Low-pressure pipe
ø19.05 [3/4"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
ø41.28 [1-5/8"]
Indoor unit connection
(Flare connection for all models)
Liquid pipe
ø6.35 [1/4"]
ø9.52 [3/8"]
ø9.52 [3/8"]
Low-pressure gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
Unit : mm [inch]
Gas pipe
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2[7/8"]
Unit : mm [inch]
ø19.05 [3/4"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
GB