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Vacuum drying
f Use the tools for R-410A only to prevent the inflow of foreign substances and resist
f
against the internal pressure .
f Use the vacuum pump with the check valve to prevent pump oil from flowing
f
backward while the vacuum pump is stopped suddenly .
f Use the vacuum pump that can be vacuumed up to 666 . 6 Pa(5 mmHg) .
f
f Close the service valve of the liquid side pipe, gas side pipe completely when
f
performing air tightening test or vacuum drying .
Connect the manifold gauge to the liquid
pipe and gas pipe .
Vacuum the liquid pipe and gas pipe
using the vacuum pump .
Vacuum those pipes for more than 2 hours
and 30 minutes .
Close the valve after checking the vacuum
gauge pressure has reached at -100 . 7 kPa
(gauge pressure) .
Check whether the pressure is maintained
as -100 . 7 kPa (gauge pressure), 5 torr . for
an hour .
Pressure Increase
No
Charging additional refrigerant according
to piping length
No
• If the pressure rises in an hour, either water remains inside the pipe, or there will be a leak .
CAUTION
Make sure to install check valve to prevent pump oil from
flowing into the pipe .
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 pressure using the vacuum gauge .
Check the gas leak .
Yes
Vacuum destruction due to the
moisture inside the pipe
• Apply pressure with Nitrogen gas of
0 . 0 5 MPa (gauge pressure) .
Perform vacuum drying again up to
-100 . 7 kPa (gauge pressure), 5 torr (for
2 hours or longer) and evaluate the
vacuum
ENGLISH-31
Low pressure side
Service port
Pressure Increase
Manifold gauge
High
pressure
side
Gas side
pipe
Liquid
side pipe
Vacuum
pump
Yes
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