2.
Pumping type
•
Make sure that all the tubes of indoor and outdoor unit are connecting well.
•
Take off valve bonnet from two-way and three-way valves by spanner; connect vacuum
pump and compound valve to the service valve bonnet.
•
Open the low-pressure switch of compound valve, and run vacuum pump until units’
internal pressure at 10 mmHg.
•
After pump vacuum, close the low-pressure switch of compound valve, and then close
vacuum pump. Turn anti-clockwise 90 Spool of narrow pipe service valve by hexagon
spanner, tightly with clockwise turning after stopping for 10 seconds.
•
Check with soap water or leak detector whether there is leakage at all connections of
indoor and outdoor unit.
•
Open wide and narrow pipe service valves by hexagon spanner for running.
•
Take off the connection pipeline of wide pipe service valve.
•
Screw tightly the entire valve bonnet by torque spanner.
•
Check with soap water or leak detector whether there are leakage at all indoor and
outdoors’ connections.
•
Put the valve bonnet and lid back to position.
Fig.17
Use R32 refrigerant special vacuum pump
Service valve
Narrow tube
Open
Fig.16
Wide tube
Fig.17
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