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C
I
OMPLETING THE
NSTALLATION
Connecting Up and Purging the Circuit
C C
A A
U U
C C
A A
U U
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 right figure. Each unit must be purged in turn.
Indoor
A-unit
Indoor
B-unit
A
B
The designs and shape are subject
to change according to the model.
Valve stem
Liquid side
Gas side
Service port
Refrigerant Refill
16
E-
T T
I I
O O
N N
T T
I I
O O
N N
1
2
3
4
Vacuum Pump
5
Stem cap
6
7
If total pipe length(A+B room) is more than 30 metres, additional
refrigerant should be charged by extra metre. You don't have to
charge additional refrigerant up to total 30 metres of connecting pipe.
1
2
3
4
5
6
7
Check the piping connections.
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.
Open the valve of the low pressure side of manifold gauge counter-
clockwise.
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.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about
10minutes.
This procedure is very important in order to avoid gas leak.
- Turn off the vacuum pump
- Remove the hose of the low pressure side of manifold gauge.
Set valve cork of both liquid side and gas side of packed valve to the open
position.
Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 18N•m with a torque wrench.
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.
Remove the valve stem cap and service port of 3-way valve.
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a charging port (3/8" or 1/2" Packed valve).
Operate the unit at the cooling mode.
Slowly open the valve of the low pressure side of manifold gauge
counterclockwise until the low pressure of manifold gauge indicates 4.3 to
4.8kg/cm
2
at the high cool operation (2-unit operation) and the standard
temperature of indoor 27°C and outdoor 35°C.
It is recommend that refrigerant should be slowly put in. If the refrigerant is
put in too quickly, compressor will be damaged.
Stop operation of the air conditioner.
Disconnect the charge hose of manifold gauge.
Close the cap of each valve.
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