(5)With the vacuum pump still running, close the “Lo” knob of the manifold valve. Then stop the vacuum pump.
(6)With the hex wrench, turn the valve stem on the narrow tube service valve
90 degrees (1/4 turn) for 10 seconds, and then turn the stem clockwise to close it again. (Fig. 58)
CAUTION Be sure to completely insert the hex wrench before attempting to turn the valve.
(7)Leak test all joints at the tubing (both indoor and out- doors) with soapy water. Bubbles indicate a leak. Tight- en the joint more when leaks, then check if there is no leak. Be sure to wipe off the soap with a clean cloth.
(8)With the hex wrench, turn the wide tube service valve stem
(9)Turn the narrow tube service valve stem counter- clockwise to fully open the valve.
(10)Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure. Then, remove the hose.
CAUTION This may cause the refriger- ant gas to leak. In order to avoid this, take off the hose quickly.
(11)Fasten the valve cap on the wide tube service port securely with an adjustable wrench or box wrench. Next, mount the valve cap on the service valve and tighten it to 170 lbs·in (200 kgf·cm) with a torque wrench. This process is very important to prevent gas from leaking from the system.
(12)Test run the air conditioner. (See next page.)
(13)While the air conditioner is running, apply liquid soap to check for any gas leaks around the service valves or caps.
(14)If there is no leakage, stop the air conditioner.
(15)Wipe off the soap on the tubing.
This completes air purging with a vacuum pump and the air conditioner is ready for actual operation.
90° (1/4 turn)
Narrow tube
Hex wrench
Wide tube
Valve cap
Vacuum hose to manifold valve
Fig. 58
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