Repair; Replacement Parts - Panasonic MDF-DU702VH Service Manual

2．Repair

2.1 Replacement parts

Preparation： Replacement parts, tools, service valves, check valves, piping, piping tools
(Cutter, reamer, bender, flare tool, expander, wrench, mirror etc.)
If you do not use a check valve, you need a coupler, piercing tool, pinch off tool,
etc.
Procedure：Exchange necessary parts according to repair contents.
In this system, install a service valve on the low pressure side and a check valve on
the high pressure side.
When installing the service valve, replace the low-pressure side service pipe. After
that, install the service valve on the low pressure side service pipe.
(Instead of installing a check valve, a coupler or a piercing tool may be used, after
vacuum evacuation, a pinch-off tool and welding may be used for sealing)
Also, when repairing the refrigeration circuit, be sure to replace the dehydrator.
※ When replacing parts, follow each parts replacement procedure.
※ Place the removed refrigeration circuit parts in a place away from the work
place without fire.
In the PA model, the service pipe
label (red tag) is attached to the pipe
for service valve installation.
Remove the label of the pipe to be
welded.
NOTE ：Check valve is also called "access connector".
When the check valve is welded, it will be hot, so remove the valve before doing.
If the check valve cannot be installed on the high pressure side, in the process of "13.
Vacuum exhaust ①"
After vacuuming for 2 to 3 hours, once the high pressure side is pinched and welded,
Vacuum is carried out for 1 to 2 hours from the low pressure side.
In this part,
Install service pipe
Service valve
MDF-DU702VH
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