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Test Operation, Troubleshooting and Maintenance
Replacement of the 4–way valve
Note: be sure there is no refrigerant inside the system and power supply has been cut off before
replacement.
Steps Image Instructions
4. Vacuum
the system
and recharge
refrigerant.
• Keep the vacuum degree to -1.0bar.
• Vacuuming period would be longer for
the repaired unit.
• Charged refrigerant should be the
same as that stated at the nameplate.
Replacement of the electric expansion valve
Note: be sure there is no refrigerant inside the system and power supply has been cut off before
replacement.
Steps Image Instructions
1. Reclaim
refrigerant and
remove the middle
panel.
• Cut off power supply of the unit.
• Reclaim refrigerant.
• Remove the middle panel.
2. Take out the
coils, pipe clamps
and rubber pads.
• Take out coils.
• Loosen screws and take out pipe
clamps and rubber pads.
• Wrap the valve with wet cloth to
prevent the sliding block from being
burn out. In this case, care must be
taken to not let water enter the pipe.
3. Desolder
connection pipes.
• Desolder connection pipes and then
disconnect them with the main body
of the valve.
• Do charge nitrogen during
desoldering.
• Protection measures should be
taken during soldering to prevent
surrounding objects from being burnt
out.
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