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Only for training and service purposes
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Part 5. Trouble Shooting
Lo
Charging
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
Open
3-Way
valve
3-Way
valve
OPEN
Open
Check valve
(1)
Vacuum
Gage
• Procedure
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-con-
nected from the vacuum pump to the valve at
the bottom of the cylinder.
– If you are using a gas cylinder, also use a
scale and reverse the cylinder so that the sys-
tem can be charged with liquid.
(2) Purge the air from the charge hose.
– Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air. (Be careful of the liquid refriger-
ant). The procedure is the same if using a gas
cylinder.
(3) Open the valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the spec-
ified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not suffi-
cient, wait approximately 1 minute and then
repeat the procedure (pumping down-pin).
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
– Stopping partway will allow the gas to be discharged.
– If the system has been charged with liquid refrig-
erant while operating the air conditioner turn off
the air conditioner before disconnecting the hose.
(5) Mount the valve stem nuts and the service port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
WARNING
When installing or relocation the unit, make sure
that no substance other than the specified refriger-
ant(R410A) enter the refrigerant circult.
- Any presence of foreign substance such as air
can cause an abnormal pressure rise and may
result in explosion or injury.
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
4. Gas Charging (After Evacuation)
Summary of Contents for A2UW18GFA0
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