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Vacuuming 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. Con

rm 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

are type connection of the indoor and outdoor unit and

repair the leak before proceeding to the next step.
Close the valve of the changing 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.

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 service
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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R410A is a new HFC refrigerant which does not damage the
ozone layer. The working pressure of this new refrigerant is
1.6 times higher than conventional refrigerant (R22), thus
proper installation/servicing is essential.
• Never use refrigerant other than R410A in an air

conditioner which designed to operate with R410A.

• Since R410A is a mixed refrigerant, any additional

refrigerant must be charged in liquid state for better
performance compared to in gas state.

• POE or PVE oil is used as lubricant for R410A

compressor, which is different from the mineral oil used
for R22 compressor. During installation or servicing, extra
precaution must betaken not to expose the R410A system
too long to moist air. Residual POE or PVE oil in the piping
and components can absorb moisture from the air.

• To prevent mischarging, the diameter of the service port

on the

are valve is different from that of R22.

• Use tools and materials exclusively for refrigerant R410A.

Tools exclusively for R410A are manifold valve, charging
hose, pressure gauge, gas leak detector,

are tools, torque

wrench, vacuum pump and refrigerant cylinder.

• As an R410A air conditioner incurs higher pressure

than R22 units, it is essential to choose the copper pipes
correctly. Never use copper pipes thinner than 0.8mm even
though they are available in the market.

• If the refrigerant gas leakage occurs during installation/

servicing, be sure to ventilate fully. If the refrigerant gas
comes into contact with

re, a poisonous gas may occur.

• When installing or removing an air conditioner, do not

allow air or moisture to remain in the refrigerant cycle.

SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

VACUUMING AND CHARGING

Vacuuming is necessary to eliminate all moisture and air from the system.

Refrigerant Piping

Outdoor Unit 3 ways valve

Allen key

Service Port