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C
I
OMPLETING THE
NSTALLATION
Air purging
C C
A A
U U
T T
C C
A A
U U
T T
The air in the indoor unit and in the pipe must be purged. If air remains in the refrigeration
pipes, it will affect the compressor, reduce to cooling/heating capacity and could lead to a
malfunction. Refrigerant for air purging is not charged in the outdoor unit. Use Vacuum
Pump as shown at the left figure. Each unit must be purged in turn.
Indoor
A-unit
Indoor
B-unit
A
B
Valve stem
Liquid side
Gas side
Service port
40
E-
I I
O O
N N
I I
O O
N N
1
Check the piping connections.
2
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port (3/8" or 1/2" Packed valve) as shown
at the right figure.
3
Open the valve of the low pressure side of manifold gauge counter-
clockwise.
4
Purge the air from the system using vacuum pump for about 10 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Remove the hose of the low pressure side of manifold gauge.
5
Set valve cork of both liquid side and gas side of packed valve to the open
position.
Vacuum Pump
6
Mount the valve stem nuts to the 2-way and 3-way valve.
And mount the service port cap to 3-way valve.
7
Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve's
stem nuts, and from the service port cap.
Stem cap
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