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The air which contains moisture remaining in the refrigeration cycle may cause a malfunction on the
compressor. After connecting the indoor and outdoor units, release air and moisture from the refrigerant
cycle using a vacuum pump, as shown below.
21
Installation Instructions
Vacuum Testing and Charging
Note: To protect the environment, be sure not to discharge the refrigerant to the air directly.
See next page for air purging steps.
Vacuum pump
Refrigerant flow direction
2-way valve
(6) Open 1/4 turn
valve cap
(1) Turn
(8) Tighten
(2) Turn
3-way valve
(8) Tighten
(1) Turn
(7) Turn to fully open the
valve
(7) Turn to fully open the valve
(8) Tighten
3-way valve diagram
connect to indoor unit
open position
spindle
service port cap
Service
port
Connect to outdoor unit
Valve core
needle
indoor unit
Valve cap
(1) Unscrew and remove caps from 2 and 3-way valves.
(4) Start vacuum pump for 10-15 minutes until reaching a vacuum of 10 mm Hg absolutes.
(6) Open 2-way valve ,1/4 turn, then close it after 10 seconds. Check tightness of all joints using liquid
soap or an electronic leak detector.
(7) Turn 2 and 3-way valves stem to fully close the valves. Disconnect the flexible vacuum pump hose.
(8) Replace and tighten all valve caps.
(5) With vacuum pump still running close the low pressure knob on vacuum pump manifold. Then stop
the vacuum pump.
(2) Unscrew and remove cap from service valve.
(3) Connect vacuum pump flexible hose to the service valve.
How to Vacuum Air Tubes:
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