Gree NCHS1B(U) Owner's Manual page 25

Piping size between mode exchanger and downstream indoor unit (" b、c、d、g")
Total rated capacity of downsteam
indoor units: X (Btu/h)
X≤9500
9500＜X≤17100
17100＜X≤48500
Size of connection pipe between indoor branch and indoor unit should be consistent with the
connection pipe of indoor unit.
Piping between indoor branch and indoor unit "e、f、i、j、k"
Rated capacity of indoor units
C(Btu/h)
C≤9500
9500＜C≤17100
17100＜C≤48500
4.2.7.3 Connecting method for indoor unit with capacity of over 48500kBtu/h
When connecting to the indoor unit with capacity of over 48500Btu/h, it is not allowed to connect
with only one branch; it must use two branches controlled by the same mainboard for parallel
connection.
Parallel connection
Indoor unit No.1 and No.2
Indoor unit No.3 and No.4
Indoor unit No.5 and No.6
Indoor unit No.7 and No.8
GMV5 HR Heat Recovery Cooling and Heating Mode Exchanger
Piping size between mode exchanger and downstream indoor unit
Gas pipe /mm(in.)
Φ9.52(3/8)
Φ12.7(1/2)
Φ15.9(5/8)
Size of connection pipe between indoor branch and indoor unit
Gas pipe /mm(in.)
Φ9.52(3/8)
Φ12.7(1/2)
Φ15.9(5/8)
Indoor unit Communication
connection for mode exchanger
"1D1 1D2"
"3D1 3D2"
"5D1 5D2"
"7D1 7D2"
Fig. 4.31
Parallel connection can be conducted only as the
combination of this table, it is not allowed to
otherwise connect. Note that after the connection,
manually set the SA2 dial code of corresponding
mainboard, and dial the code in the first place to
number end.
22
Liquid pipe/mm(in.)
Φ6.35(1/4)
Φ6.35(1/4)
Φ9.52(3/8)
Liquid pipe/mm(in.)
Φ6.35(1/4)
Φ6.35(1/4)
Φ9.52(3/8)
Remarks