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Test Operation, Troubleshooting and Maintenance
Replacement of the 4–way valve
Note: be sure power supply has been cut off and refrigerant has been reclaimed before replacement.
Steps Image Instructions
3. Replace it with a
new one and pipes.
• Do use the one with the same
model for replacement. The one
with different model can be used
after being approved by relative
technicians.
• Wrap it with wet cloth.
• Reconnect the main body with four
pipes as before.
• Solder the pipelines with a soldering
gun.
• Do charge nitrogen during
desoldering.
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: check the whole system, pipelines and electric lines, cut off power supply and reclaim
refrigerant 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.
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