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VACUUMING AND CHARGING
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.
Service Port
Outdoor Unit 3 ways valve
Flare nut
Refrigerant Piping
Allen key
Suction
valve
Discharge
Valve
Indoor Unit
Outdoor Unit
Liquid side
Gas side
Vacuum
pump
Open
Close
Close
Close
Hi
Low
Model
10 / 15G
10 / 15GR
20G
20GR
25G
25GR
10m/32.8ft 12m/39.4ft 15m/49.2ft
35 65 –
50 90 –
35 65 110
60 110 185
90 165 280
120 220 370
Additional charge in gram (For R22 models)
Model
10 / 15G
10 / 15GR
20G
20GR
25G
25GR
10m/32.8ft 12m/39.4ft 15m/49.2ft
35 60 –
45 80 –
35 60 100
55 100 165
80 150 265
110 200 335
Additional charge in gram (For R410A models)
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.
Open
Open
Suction
Valve
Discharge Valve
Indoor Unit
Outdoor Unit
Liquid side
Gas side
Check
Valve
Close
Hi
Low
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.
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