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18
Supplementary refrigerant
The refrigerant supplementation shall be as specified in the installation instructions
attached with the outdoor unit. The added refrigerant shall be R22.
The adding procedure shall be aided with a measuring meter
for a specified amount of supplemented refrigerant
Requirement
Overfilling or underfilling of refrigerant will cause compressor
fault. The amount of the added refrigerant shall be as specified
in the instructions.
Connection of refrigerant pipe
The connection of indoor unit pipes must use double spanners.
The installing torque shall be as given in the following table.
Double-spanner
operation
Connecting pipe
O.D.(mm)
ÿ 6.35
ÿ 9.52
ÿ 12.70
ÿ 15.88
Installing torque
(N-m)
11.8 (1.2kgf-m)
24.5 (2.5kgf-m)
49.0 (5.0 kgf-m)
78.4 (8.0 kgf-m)
Increased installing
torque (N-m)
13.7 (1.4 kgf-m)
29.4 (3.0 kgf-m)
53.9 (5.5 kgf-m)
98.0 (10.0 kgf-m)
Conduct flared connection work to connect all refrigerant pipes.
Pipe cutting and expanding
If the pipe is too long or the flare is damaged, it needs to be cut or expanded.
Pipe expander
Pipe expansion dimensions as follows:
A
Allowable pipe length and drop
These parameters differ according to the outdoor unit. See the instruction manual attached
with the outdoor unit for details.
Installation Procedure
1. Pipe cutting 2. Removing burrs 3.Insertion nut 4. Pipe expansion
Slope Damage Bur Partial Overlong
Correct
Incorrect
6.35 mm (1/4
"
) 0.8 ~ 1.5
9.52 mm (3/8
"
) 1.0 ~ 1.8
12.7 mm (1/2
"
) 1.2 ~ 2.0
15.88 mm (5/8
"
) 1.4 ~2.2
Pipe diameter ÿ Size A (mm)