Charge Pentane To Refrigeration Circuit - Panasonic MDF-DU702VH Service Manual

Procedure2:
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:
VCU
Teflon
hose
Pentane
cylinder
VCL
Powerful vacuum pump
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.
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.
Pentane
cylinder
VCL
Pentane
dryer
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.
Dedicated GM
Refringent
VR
port
Negative
負圧計
pressure
gauge
VC
Vacuum
port
Charge hose
-50-
Charge hose
Explosion-proof
Flare
vacuum pump
connector
Pentane
container
VH
VG
VL
Low pressure side
service port
Valve Operation
High pressure
port
open
○
VC
Low pressure
○
VG
port
VL
VH
○
VR
SVL
VCU
VCL
SVL
shut
○
○
○
○
○