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Purging the piping and the indoor unit
Except for the outdoor unit which is pre-charged with
refrigerant, the indoor unit and the refrigerant
connection pipes must be air-purged because the air
containing moisture that remains in the refrigerant cycle may
cause malfunction of the compressor.
•
Remove the caps from the valve and the service port.
•
Connect the center of the charging gauge to the vacuum
pump.
•
Connect the charging gauge to the service port of the
3-way valve.
•
Start the vacuum pump. Evacuate for approximately
30 minutes. The evacuation time varies with different
vacuum pump capacity. Confirm that the charging gauge
needle has moved towards -760mmHg.
Caution
•
If the gauge needle does not move to -760mmHg, be
sure to check for gas leaks (using the refrigerant
detector) at flare type connection of the indoor and out-
door unit and repair the leak before proceeding to the
next step.
•
Close the valve of the charging gauge and stop the
vacuum pump.
•
On the outdoor unit, open the suction valve (3 way) and
liquid valve (2 way) (in anti-clockwise direction) with
4mm key for hexagon sacked screw.
Additional charge
The refrigerant is pre-charged in the outdoor unit. If the
piping length is less than 7.62m (25ft), then additional charge
after vacuuming is not necessary. If the piping length is more
than 7.62m (25ft), then use the additional charge valve as
indicated in the table.
Charge operation
This operation must be done by using a gas cylinder and a
precise weighing machine. The additional charge is topped-
up into the outdoor unit using the suction valve via the ser-
vice port.
•
Remove the service port cap.
•
Connect the low pressure side of the charging gauge to
the suction service port center of the cylinder tank and
close the high pressure side of the gauge. Purge the air
from the service hose.
•
Start the air conditioner unit.
•
Open the gas cylinder and low pressure charging valve.
•
When the required refrigerant quantity is pumped into
the unit, close the low pressure side and the gas cylinder
valve.
•
Disconnect the service hose from service port. Put back
the service port cap.
VACUUMING AND CHARGING
Indoor Unit
Vacuum
pump
Additional charge in gram (For R22 models)
Additional charge in gram (For R410A models)
Indoor Unit
1-7
Allen key
Flare nut
Service Port
Outdoor Unit 3 ways valve
Liquid side
Discharge
Gas side
Suction
Open
Hi
Low
Close
Model
10m/32.8ft
10 / 15G
35
10 / 15GR
50
20G
35
20GR
60
25G
90
25GR
120
Model
10m/32.8ft
10 / 15G
35
10 / 15GR
45
20G
35
20GR
55
25G
80
25GR
110
Liquid side
Discharge Valve
Gas side
Suction
Check
Valve
Valve
Hi
Low
Close
Refrigerant Piping
Outdoor Unit
Valve
Close
valve
Close
12m/39.4ft 15m/49.2ft
65
–
90
–
65
110
110
185
165
280
220
370
12m/39.4ft 15m/49.2ft
60
–
80
–
60
100
100
165
150
265
200
335
Outdoor Unit
Open
Open
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