Preparation For Charge; Preparation: Leak Check Spray; Starting Gas Charge - Panasonic MDF-DU702VH Service Manual

4.3 Preparation for charge

Preparation: Leak check spray

Procedure: Re-check the type of refrigerant and the amount sealed.
Open the valve slowly in the order of the main valve of the refrigerant cylinder →
VS → VR → VL, the indication of scale.
After stabilizing (calm down), reset the display of scale. (0 display)
Perform a leak check to the dedicated GM.
Note : Use a leak check spray (also liquid detergent is acceptable) to check the gas
leak at the connection point.
Pay attention to the posture of the refrigerant cylinder when it is enclosed,
depending on the structure of the cylinder, because it may be inverted or
sideways.

4.4 Starting gas charge

Procedure: Open SVL slowly and check that the display value of scale slowly decreases.
When the specified amount approaches, start slowly closing the SVL, and when
reaching the specified amount, shut the SVL. (Please note that there is a time
lag between SVL closing operation and display of scale responding to it) Record
the final charge amount and shut the main valve of the refrigerant cylinder →
VS → VR → VL.
Note: Instead of SVL, VS can be opened and shut to adjust the gas filling amount, but
the accuracy of filling quantity is bad. In that case, it is necessary to operate the
body compressor and suck in the refrigerant from SVL to VS
Valve state
open shut
○
VC
○
VG
○
VL
○
VH
○
VR
○
VS
○
main
○
SVL
valve state
open shut
○
VC
○
VG
○
VL
○
VH
○
VR
○
VS
○
main
SVL adjustment
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