Gree GMV-Pdhm1800W4/Na-M, Installation And Operating Instruction Manual

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25
Connection of Indoor and Outdoor Unit
● Installation requirements of refrigerant piping
1. Specification of Connecting Pipes
R410A refrigerant system
External
Diameter(mm/inch) Thickness(mm) Type
Φ 6.35(1/4)
≥ 0.8 0
Φ 9.52(3/8)
≥ 0.8
0
Φ 12.70(1/2) ≥
0.8
0
Φ 15.88(5/8) ≥
1
0
Φ 19.05(3/4) ≥
1
1/2H
Φ 22.2(7/8)
≥ 1.5
1/2H
Φ 25.40(1/1) ≥
1.5
1/2H
Φ 28.60(9/8) ≥
1.5
1/2H
Φ 34.90(11/8)
≥ 1.5
1/2H
Φ 38.10(12/8)
≥ 1.5
1/2H
Φ 41.30(13/8) ≥
1.5
1/2H
Φ 44.45(7/4) ≥
1.5
1/2H
Φ 54.1(17/8)
≥ 1.5 1/2H
2. Allowable Length and Height Differences of the Connecting pipes between the Indoor and Outdoor Units
R410A refrigerant system
Allowable
(m/ft)
value
Fitting pipe
Total length (actual length) of fitting pipe 500/1640 L
1
+L
2
+L
3
+L
4
+…+L
9
+a+b+…+s+t
Actual length 150/492 Length of the furthest fitting
pipe Equivalent length 175/574
L
1
+L
6
+L
7
+L
8
+L
9
+o+t
Equivalent length of fitting pipe
from the 1
st
branch joint to farthest indoor unit
40/131.2 L
1
+L
6
+L
7
+L
8
+L
9
+o+t
Outdoor unit at
upper
50/164
——
Height differences between
indoor unit and outdoor unit
Outdoor unit at
lower
40/131.2
——
Height differences between indoor units 15/49.2
——