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Service Manual
2-way, 3-way Valve
(3) Gas Charging
(After Evacuation)
• Procedure
1. Connect the gauge to the charging cylinder.
- Connect the charge hose, which you discon-
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 system 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.
The procedure is the same if using a gas cylinder.
3. Open the low handle on the gauge and charge
the system with liquid refrigerant.
-
If the system can not be charged with the specified
amount of refrigerant, it can be charged with a little at a
time (approximately 150g(5.29oz) each time) while oper-
ating the air conditioner in the cooling cycle; however,
one time is not sufficient, wait approximately 1 minute
and then repeat the procedure(pumping down-pin).
4. Immediately disconnect the charge hose from
the gas side valve's service port.
-
Stopping part way 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.
Replace the valve stem nuts and the service port nut.
- Use torque wrench to tighten the service port
nut to a torque as indicated below.
- Be sure to check for gas leakage.
manifold gauge
Charging
cylinder
Hi- handle
(OPEN)
Low-handle
(OPEN)
Check valve
Indoor unit
Outdoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
Indoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
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.
Outside diameter Turque
mm inch kg
.
m lbf
.
in
Ø6.35 1/4 1.8 156.2
Ø9.52 3/8 4.2 364.5
Ø12.7 1/2 5.5 477.4