Samsung AM JXVHGH Series Installation Manual page 87

Vacuum drying pipes and indoor units
f Use tools for R-410A to prevent the inflow of foreign substances and resist against the internal pressure . X
f Use vacuum pump that allows vacuuming under -100 .7kPa (5 Torr) .
X
f Use the vacuum pump with the check valve to prevent pump oil from flowing backward while the vacuum pump
X
is stopped .
f Completely close the liquid·gas side service valve of the outdoor unit . X
Connect the manifold gauge to the liquid side
pipe and gas side pipe (when installing outdoor
units in module) .
Perform vacuum drying of the liquid side pipe and
gas side pipe (when installing outdoor units in
module) using a vacuum pump .
While the vacuum gauge pressure is less than
-100 .7 kPa (5 Torr), perform the vacuum drying for
more than 1 hour and close the valve .
After vacuum pump stops, check whether the
pressure is maintained within -100 .7 kPa (5 Torr)
for an hour .
Over -100 .7 kPa (5 Torr)
No
Charge additional refrigerant to the pipe
❇ If the pressure rises in an hour, either water is remaining inside the pipe or there is a leakage .
❇
❇ When the ambient temperature of vacuuming pipe is low (less than 0 °C), moisture might remain within the pipe .
❇
Therefore, pay special attention to the pipe sealing in the winter .
DVM S HE_IM_DB68-05461A-08_EN.indd 87
When installing outdoor units in module, connect the manifold
gauge to liquid side pipe and the gas side pipe .
Make sure that check valve is installed to prevent pump oil from
flowing into the pipe .
Vacuum pressure must be checked with the vacuum gauge .
Check for gas leakage
Yes Vacuum destruction
• Apply nitrogen gas to the pipe at pressure
of 0 .05 Mpa .
Perform vacuum drying again
No
Pressure increase
Yes
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2017-03-24 오후 1:38:42