Panasonic MDF-DU702VH, Service Manual

Page: 53 / 78

Procedure2: Dip the tip of the pentane dryer in pentane solution.
With the VCU opened slightly, opening the VCL slowly will cause the pentane
to begin to be sucked into the cylinder.
When the specified amount of pentane is sucked into the cylinder, pull out of
pentane ends when VCL is "shut". Shut the VCU, shut down the vacuum
pump, remove the charge hose from the VCU, and remove the pentane dryer
from the VCL.
Note2
：
When sucking up pentane, in order to prevent over suction, VCL slowly gently
opens and shut and adjusts the suction amount.
Remove the pentane solution from the tip of the pentane dryer for a while, so
remove the pentane dryer from the pentane cylinder and remove it from the
pentane container after all the pentane has fallen.
4.7.2
Charge pentane to refrigeration circuit
Preparations
：
Powerful vacuum pump, Teflon hose (for pentane)
Procedure: With the VR shut, connect the valve VCL of the pentane cylinder with the
refrigerant port of the dedicated GM with a Teflon hose.
Operate the vacuum pump, open the valves VC, VG, VR and evacuate the
Teflon hose.
Note 1: In order to prevent corrosion of hose by pentane and flow into service valve, be sure
to use Teflon hose for connection between pentane cylinder and dedicated GM.
VCL
Pentane
cylinder
Pentane
dryer
Explosion-proof
vacuum pump
Charge hose
Pentane
container
Flare
connector
Valve Operation
open shut
VC
○
VG
○
VL
○
VH
○
VR
○
VCU
○
VCL
○
SVL
○
SVL
負圧計
Powerful vacuum pump
Charge hose
Low pressure side
service port
Teflon
hose
VCU
VCL
Pentane
cylinder
VR
VG
VL
VC
VH
Refringent
port
Vacuum
port
High pressure
port
Low pressure
port
Dedicated GM
Negative
pressure
gauge
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