Vacuum pump
Indoor unit
Refrigerant flow direction
3-way valve
Service port
(2) Turn
(8) Tighten
(7) Turn to fully
open the valve
Valve cap
(1) Turn
(8) Tighten
2-way valve
(6) Open 1/4 turn
(7) Turn to fully open the valve
(1) Turn
Valve cap
(8) Tighten
Connect to indoor unit
3-way valve diagram
Open position
Spindle
Connect to outdoor unit
Valve core
Needle
Service port cap
20
AIR PURGING
Air containing moisture remaining in the refrigeration cycle may cause a malfunction on the compressor.
After connecting the indoor and outdoor units, evacuate air and moisture from refrigerant cycle using a
vacuum pump, as shown below.
Note:
Because the system pressure is high and also to protect the environment, be sure not to discharge
the refrigerant to the air directly.
How to Purge Air Tubes:
1. Unscrew and remove caps from 2 and 3-way valves.
2. Unscrew and remove cap from service valve.
3. Connect vacuum pump flexible hose to the service valve.
4. Start vacuum pump for 10-15 minutes until it reaches an absolute vacuum of 10 mm Hg.
5. With vacuum pump still running close the low pressure knob on vacuum pump manifold. Then stop
vacuum pump.
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. Disconnect vacuum pump flexible hose.
8. Replace and tighten all valve caps.
