Installation Requirements Of Refrigerant Piping; Specification Of Refrigerant Pipe; Allowable Length And Height Differences Of The Refrigerant Piping Between The Indoor And Outdoor Units; Size Of Connection Pipe - Gree DC Inverter Multi VRF Service Manual

DC INVERTER MULTI VRF

5 INSTALLATION REQUIREMENTS OF REFRIGERANT PIPING

5.1 Specification of refrigerant pipe

External
Diameter(mm/inch)
φ6.35
φ9.52
φ12.7
φ15.9
φ19.05
5.2 Allowable Length and Height Differences of the Refrigerant Piping between the Indoor and Outdoor
Units
Total Length (Actual Length) of Pipes
Length of farthest pipe (m)
Length of pipe from the 1
Height difference between
indoor unit and outdoor unit
Height difference between indoor unit and outdoor unit

5.3 Size of Connection Pipe

5.3.1 The size of the pipe (main pipe) from the outdoor unit to the 1
of outdoor pipe.
Size of Outdoor Pipe
Item
Liquid
pipe
Connection
Air pipe
Pipe
Connection
mode
Note: If the equivalent length of total t pipe exceeds 90m, the fitting pipe on gas side and liquid
side shall be increased of one dimension.
5.3.2 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
C≤50
50<C≤140
R410a refrigerant system
Thickness(mm)
≥0.8
≥0.8
≥1
≥1
≥1
Actual Length
Equivalent Length
st
manifold to the farthest indoor unit
Outdoor unit on upper
Outdoor unit at lower
Model GMV(L)-Pd100
W/NaB-K
mm φ9.52
mm φ15.9
External
Diameter(mm/inch)
φ22.2
φ25.4
φ28.6
φ34.9
Allowable Value
100,120,140,160
150m
70m
80m
25m
30m
25m
10m
st
GMV(L)-Pd120 GMV(L)-Pd140
W/NaB-K W/NaB-K
φ9.52
φ15.9
Flared connection
Air pipe
φ12.7
φ15.9
INSTALLATION
Thickness(mm)
≥1.5
≥1.5
≥1.5
≥1.5
Pipe
L +L +L +a+b++c+d
1 2 3
L +L +L +d
1 2 3
L +L +d
2 3
——
——
——
manifold is same as the size
GMV(L)-Pd160
W/NaB-K
φ9.52 φ9.52
φ15.9 φ19.05
Liquid pipe
φ6.35
φ9.52
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