Gas Charge; Completion Of Evacuation - Panasonic MDF-DU702VH Service Manual

4．Gas charge
4.1 Evacuation②
Preparations: Dedicated GM, Refrigerant Cylinder, Bottle Cap, Powerful Vacuum Pump, Scale
(Electronic Weighing Scale), Charge hose, branching tool, tool
Procedure : After operating the powerful vacuum pump with the refrigerant cylinder on the scale,
Open the valve in the following order and evacuate to the refrigerant cylinder.
VS⇒VR⇒VG⇒VC.
Vacuuming time: about 1 minute with a vacuum pump with capacity of 300 L / min
(Standard: vacuum degree 3 Torr or less)
Main valve
Scale

4.2 Completion of evacuation

Procedure : Specified time (about 1 minute) after evacuating,
shut the valve in the following order and stop the pump.
VC⇒VG⇒VR⇒VS
Remove the vacuum pump from the hose.
Dedicated GM
Refrigerant
VR
port
VS
VC
Vacuum
port
Charge hose
Powerful vacuum pump
-46-
VH
VG
VL
Valve state
open shut
○
VC
○
VG
○
VL
○
VH
○
VR
○
VS
○
Main
○
SVL
Valve state
VC
VG
VL
VH
VR
VS
main
SVL
High pressure
port
Low pressure
port
SVL
Low pressure side
service valve
open shut
○
○
○
○
○
○
○
○