Gree GMV-PD140W/NAB-K

65
DC Inverter Multi
VRF Service Manual
4 INSTALLATION REQUIREMENTS OF REFRIGERANT PIPING
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R410a refrigerant system
External Diameter(mm/inch) Thickness(mm) External Diameter(mm/inch) Thickness(mm)
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4.2 Allowable Length and Height Differences of the Refrigerant Piping between the Indoor and Outdoor
Units
Allowable Value
Pipe
100,120,140,160
Total Length (Actual Length) of Pipes 150m L1+L2+L3+a+b++c+d
Length of farthest pipe (m)
Actual Length 70m
L1+L2+L3+d
Equivalent Length 80m
Length of pipe from the 1st manifold to the farthest indoor unit 25m L2+L3+d
Height difference between
indoor unit and outdoor unit
Outdoor unit on upper 30m ——
Outdoor unit at lower 25m ——
Height difference between indoor unit and outdoor unit 10m ——
4.3 Size of Connection Pipe
4.3.1 The size of the pipe (main pipe) from the outdoor unit to the 1st manifold is same as the size of outdoor
pipe.
Size of Outdoor Pipe
Model
Item
GMV-Pd100W/NaB-K GMV-Pd120W/NaB-K
GMV-Pd140W/NaB-K
GMV-Pd140W/NaB-M
GMV-Pd160W/NaB-K
GMV-Pd160W/NaB-M
Connection
Pipe
Liquid pipe mm ĭ ĭ ĭ ĭ
Gas pipe mm ĭ ĭ ĭ ĭ
Connection mode Flared connection
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shall be increased of one dimension.
4.3.2 The size of the pipe (branch pipe) between the manifolds is selected according to the capacity of
downstream indoor unit to be connected (See Table below). If exceeding the capacity of outdoor unit, the
capacity of outdoor unit will prevail.If exceeding the capacity of outdoor unit, the capacity of outdoor unit will
prevail.
Total capacity of indoor units Air pipe Liquid pipe
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