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(5) With the vacuum pump still running, close the
"Low" 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. 36)
Be sure completely insert
CAUTION
the hex wrench before
attempting to turn the
valve.
(7) Leak test all tubing joints (both indoor and outdoor)
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 counter-clockwise to fully open the
valve.
(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.
This may cause the refriger-
CAUTION
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 tightened it to 20 N·m (200 kgf·cm)
with a torque wrench. This process is very impor-
tant to prevent gas leaking from the system.
(12) Test run the air conditioner. (See page 17)
(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 opera-
tion.
90° (1/4 turn)
Vacuum hose to manifold valve
14
Narrow tube
Hex wrench
Wide tube
Valve cap
Fig. 36
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