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Exhaust
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1.
Exhausting type
Make sure that all the tubes of indoor and outdoor unit are connecting well.
Take off valve bonnet and service port valve bonnet from two-port valve (small pipe cut-off valve) and
three-port valve (large pipe cut-off valve).
Turn counter-clockwise 1/4 turn the spool of two-pot valve, close after 10 seconds.
To check whether there are leakage at all connections.
If there is no leakage, turn again two-port valve counter-clockwise 1/4 turn, at the same time hold out
against the exhaust from valve inside of service port of three-port valve for 10 seconds.
Open two-port and three-port valves for running.
Screw tightly the valve bonnet.
Check with soap water or leak detector whether there are leakage at all indoors and
outdoors’
connections.
Put the valve bonnet and valve cover back to the position.
Narrow tube
Wide tube
Open
Service valve
Fig.16
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.
