installing the unit _41
ENGLISH
VACUUM DRYING
• Use the tools for R410A to prevent the inflow of foreign substances and resist against the internal
pressure.
• Vacuum system to -100.7kPa(14.6psi).
• Use the vacuum pump with the check valve to prevent pump oil from flowing backward while the
vacuum pump is stopped.
• Close the service valve of the liquid side pipe, gas side pipe and oil balancing pipe completely.
The pressure rises.
No
Connect the gauge manifold to the liquid
side pipe, gas side pipe and oil balancing
pipe(only for module).
Connect the gauge manifold to the oil balancing pipe.
Perform vacuum drying of the liquid side
pipe, gas side pipe and oil balancing
pipe(only for module) using the vacuum
pump.
Make sure that check is installed valve to prevent pump
oil from flowing into the pipe.
Perform vacuum drying for 2 hours and
30 minutes or longer.
The time of vacuum drying may differ depending on
the length of the pipe or outdoor temperature.
Perform vacuum drying for at least 2 hours and 30 minutes.
Check the vacuum gauge pressure at
-100.7kPa(14.6psi) for an hour after
stopping the vacuum pump.
Adding refrigerant according to piping
length
Check the gas leak again.
- The pressure rises because water is
remaining in the pipe.
Vacuum destruction
- Apply pressure with Nitrogen gas of
0.05MPa(7.25psi).
Perform vacuum drying again up to
-100.7kPa(14.6psi) (for 2 hours or longer).
Yes
The pressure rises.
Yes
No
Close the valve after the vacuum
gauge pressure has reached at
-100.7kPa(14.6psi).
Check the vacuum pressure using the vacuum gauge.
• If the pressure rises in an hour, water remains inside the pipe or there will be a leak.
• Make sure to perform the airtight test and vacuuming for liquid pipe, gas pipe
and high pressure gas pipe after Heat Recovery installation.
If not, a trouble is caused in the airtight test and vacuum due to obstruction of
gas flow.
CAUTION
DVM PLUS3_IM_E_31180-1.indd 41 2009-10-16 ｿﾀﾈﾄ 2:10:36
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