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Liquid side
Outdoor unit
3-way
valve
Gas side
Indoor unit
2-way
valve
Clsed
Clsed
Lo
Vacuum pump
CLOSE
OPEN
* Procedure
(1)Connect the charge hose from the manifold valve to the ser-
vice port of the gas side packed valve.
(2)Connect the charge hose to the port of the vacuum pump.
(3) Open fully the low pressure side handle of the gauge mani-
fold valve.
(4)Operate the vacuum pump to begin evacuating. Perform
evacuating for about 15 minutes if the piping length is 20 meters
(15 minutes for 20 meters) (assuming a pump capacity of 27
liters per minute). Confirm that the compound pressure gauge
reading is –101 kPa (–76 cmHg).
(5)Close the low pressure valve handle of gauge manifold.
– Check the flare connections for gas leakage.
(6)Use torque wrench to tighten the service port nut to a torque
of 1.8kg.cm.
(7)Set the 3-way valve to the back seat.
(8)Mount the valve stem nuts to the 2-way and 3-way valves.
(9)Check for gas leakage.
– At this time, especially check for gas leakage from the 2-way
and 3-way valve’s stem nuts, and from the service port nut.
CAUTION:
If gas leakage are discovered in step 5 above, take the
following mesures :
If the gas leaks stop when the piping connections are
tightened further, continue working from step 6. If the
gas leaks do not stop when the connections are
retightened, repair the location of the leak, discharge
all of the gas through the service port, and then recharge
with the specified amount of gas from a gas cylinder.
Troubleshooting
68