MAINTENANCE
77
English
Vacuuming the pipes
f
Use tools for R-410A to prevent the inflow of foreign substances and resist against the internal pressure.
f
Use vacuum pump that allows vacuuming under 5 Torr.
f
Use the vacuum pump with the check valve to prevent pump oil from flowing backward while the vacuum pump is
stopped.
f
When testing air tightness and vacuuming, use charging port on product.
Connect manifold gauge to charging port
ŷ
When installing products in module, connect the manifold gauge to
each charging port.
Perform vacuuming using a vacuum pump
ŷ
Make sure that check valve is installed to prevent pump oil from
flowing into the pipe.
While the pressure is less than 5 Torr on
vacuum gage, perform vacuuming for
more than 1 hour and close the valve
ŷ
Vacuum pressure must be checked with the vacuum gauge.
After the vacuum pump stops, check
whether the pressure is maintained within
5 Torr for an hour
Charging refrigerant
No
Yes
Perform vacuum drying again
Check leakage
Vacuum destruction
Apply nitrogen gas to the pipe at
pressure of 0.05 MPa (7.25 psi)
Yes
No
Over 5 Torr
Pressure increase
CAUTION
ŷ
If the pressure rises in an hour, either water is remaining inside the pipe or there is a leakage.
ŷ
When the ambient temperature of vacuuming pipe is low (less than 0°C (32°F)), moisture might remain within
the pipe. Therefore, pay special attention to the pipe sealing in the winter.
Summary of Contents for AG010KSV Series
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