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Manometer
-76cmHg
Low-pressure
valve (Lo) Open
Liquid valve
Gas valve
High-pressure
valve (Hi) closed
Charging hose
Vacuum
pump
1.Connect charging hose of to charge nozzle. (both cores of gas and
liquid valves should be shut down tightly.)
2.Connect joint of charging hose to vacuum pump.
3.Fully open low-pressure valve(Lo) of manometer.
4.Make vacuum pump operate for 15 min above.Close lowpressure
valve(Lo) to stop vacuum pump after confirmation of -1.0X10 pa(-76cmHg)
at manometer .Then check if there is air in the pipe(keep for 2 min to se e
if indicated needle of manometer returns).If there is ,re-operate the vacuum
pump after restoration.
5.Remove charging hose from gas valve.
6.Fully open the cores of gas valve and liquid valve.
7.Tighten bonnet of gas valve and liquid valve and nut of charge nozzle.(As shown in Fig.15 )
When using vacuum pump
Fig.15
Leakage detection
Coat soap water at the gap between connection pipes to see if there is any leakage.If there is air bubble at this position,it
should leak.(As shown in Fig.16
Leakage detector,if possible,can be used.
Leakage detection spot of indoor unit
Leakage detection spot of outdoor unit
Fig.16
5
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