Stop Gas Charge; Gas Leak Check - Panasonic MDF-DU702VH Service Manual

4.5 Stop gas charge

Preparations ：Tools, Explosion-proof vacuum pump
Procedure : As shown in the figure below, let the long hose outdoors and connect the
explosion-proof vacuum pump. Activate the pump, open the valves (VC, VG, VL,
VR, VS) and suck out the remaining refrigerant of the hose / general purpose
GM.
When release of the refrigerant is completed, shut all the valves and stop the
pump. Remove the hose from the low pressure service valve.
Main valve
Scale
Note：Be sure to use explosion-proof type when using vacuum pump to suck refrigerant.
Do not use the powerful vacuum pump used for evacuation by mistake.

4.6 Gas leak check

Preparation : Detector
Procedure : Leak check low pressure service valve with charge hose removed using detector.
Subsequently, the high pressure side service port and the part welded and
connected at the time of repair are likewise leak checked. If there is no
abnormality, attach the cap to the low-pressure side service valve and the
high-pressure side service port
Low pressure side
service port
High pressure side
service port
Note： Do not apply excessive force to the welded portion of piping when installing the
rear cover after the work (prevent occurrence of cracks).
Dedicated GM
Refringent
port
VS
VC
Vacuum
port
Long hose
Explosion-proof
vacuum pump
SVL
-48-
VR
VH
VG
VL
Low pressure side
service valve
High pressure
port
Low pressure
port
Charge hose
SVL
SVL
Gas leak tester