17
Installation Procedure
Vacuum pumping
With a vacuum pump, create vacuum from the stop valve of the outdoor unit.
l
Emptying with refrigerant sealed in the outdoor unit is absolutely forbidden.
Open all valves
Open all the valves on the outdoor unit.
Gas leakage detection
Check with a leakage detector or soap water that if there is gas leakage at the pipe
connections and bonnets.
Insulation treatment
Conduct insulation treatment on both the gas side and liquid side of pipes respectively.
During cooling operation, both the liquid and gas sides are cold and thus shall be insulated
so as to avoid dew generation.
l
The insulating material at gas side shall be resistant to a temperature above 120
*
.
l
The indoor unit pipe connection part shall be insulated.
The notch upward (Attached detail view)
Indoor unit
Subsidiary insulation tube
Field piping side
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)
Ø6.35
Ø9.52
Ø12.70
Ø15.88
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)
Pipe expansion dimensions as follows:
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
Ø
Size A (mm)
Summary of Contents for MRV 09 Series
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