(5)With the vacuum pump still running, close the “Lo” knob of the manifold valve. Then stop the vacuum pump.
(6)With the accessory hex wrench, turn the valve stem on the narrow tube service valve counter- clockwise by 90 degrees (1/4 turn) for 10 seconds, and then turn the stem clockwise to close it again. (Fig. 53)
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 outdoors) with liquid soap. Bubbles indicate a 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.
(11)Replace the bonnet and flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or box wrench. Next, mount the valve cap and tighten it with a torque wrench (the cap needs to be tightened with the torque of 170 lbs.•in. (200 kg•cm)). 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 ser- vice 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. 53
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