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12-4-3.
Install (first by hand-tightening, then securely with
a wrench) flare nuts and bonnets at all service
valves in the refrigeration circuit where evacuation
will take place. This process is highly important
to completely evacuate the system.
12-4-4.
With the " Lo " and "Hi" knobs of the manifold valve
open run the vacuum pump. The operation time
varies with the capacity of the pump.
Evacuation is successful if the vacuum gauge
reading remains – 75 cmHg or more for at least 10
seconds after closing the " Lo " and "Hi" knobs of
the manifold valve.
12-4-5.
With the vacuum pump still running, turn the wide
and narrow service valves all the way in order to close
them (position -a-).
Stop the pump.
12-4-6.
After removing the vacuum hoses from the service
valves, replace the flare nuts and bonnets on the
valves. The refrigerant circuit is now ready for
charging.
12-5. Refrigerant charging
12-5-1.
After evacuation is completed, charge the circuit
with the proper amount of refrigerant.
NOTE
The proper amount of refrigerant is specified on
the nameplate of the outdoor unit and in Section
"2-1. Unit Specifications" in the service manual.
12-5-2.
Use a hose to connect the narrow tube service
valve to the liquid port of the charging cylinder.
(Fig.12-4 )
12-5-3.
Purge air from the hose. Do this by opening the
charging cylinder valve, then slightly loosening the
connection to the narrow tube service valve. Wait
a few moments, then retighten the connection.
52
Fig. 12-3
Fig. 12-4
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