Carrier 53KHET 12 Installation Manual page 36

CONNECTING REFRIGERANT PIPING LINES (Cont.)
AIR PURGING OF INDOOR UNIT AND REFRIGERANT PIPING LINES
USING REFRIGERANT CONTAINED IN OUTDOOR UNIT (Cont.)
Air purging procedure
(1) Recheck the refrigerant piping connections.
(2) Open the valve stem of the 2-way liquid valve counterclockwise approximately 90°,
wait 10 seconds, and then set it to closed position.
• Be sure to use a hexagonal wrench to operate the valve stem.
(3) Check for gas leakage from flare connections.
(4) Purge the air from the system
• Set the 2-way liquid valve to the open position and remove the cap from the 3-way gas
valve's service port.
• Using the hexagonal wrench to press the valve core pin, discharge for three seconds and
then wait for one minute.
(5) Use torque wrench to tighten the service port cap to a torque of 1.8 kg.m. (18 Nm)
(6) Set the 3-way gas valve to the open position.
(7) Mount the valve stem nuts to the 2-way liquid and 3-way gas valves.
(8) Check for gas leakage.
• At this time, especially check for gas leakage from the 2-way and 3-way stem nuts,
and from the service port.
CAUTION
If gas leakage is discovered in step (3) above, take the following measures.
• If the leaks stop when the piping connections are tightened further, continue working from step (4).
• 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.
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