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10-6. In Case Refrigerant is Leaking
CAUTION
(1) Detecting Leaks
Use the detector for R410A to locate refrigerant leak
points.
(2) Recovering refrigerant
Never release the gas to the atmosphere; recover
residual refrigerant using the refrigerant recovery unit
for R410A, instead.
Do not reuse the recovered refrigerant because its
composition will have been altered.
(3) Welding leaking points
Confirm again that no residual refrigerant exists in the
unit before starting welding.
Weld securely using flux and wax for R410A.
Prevent oxide film from forming inside the tubes
utilizing substitution with nitrogen (N2) in the
refrigerant circuit of the unit. Leave ends of tubes
open during welding.
(4) Checking for sealing
Use nitrogen gas for the pressurized gas, and never
use a refrigerant other than R410A. Also do not use
oxygen or any flammable gas.
(5) Evacuation
Use a solenoid valve-installed vacuum pump so
that even if power is cut off in the middle of evacuation
of air due to a power interruption, the valve will prevent
the pump oil from flowing back.
The equipment may be damaged if moisture remains in
the tubing, thus carry out the evacuation thoroughly.
When using a vacuum pump with exhaust air volume
more than 25L/min. and ultimate vacuum pressure rate
of 0.05Torr:
Standard time for evacuation
Length of tubing
Time
Never attempt to charge additional refrigerant when refrigerant has been leaking
from the unit. Follow the procedure described below to locate points of leaks and
carry out repairs, then recharge the refrigerant.
Less than 10 m
More than 10 minutes
(1) Detect leaks
(2) Recover refrigerant
(3) Weld leaking points
(4) Check for sealing
(5) Evacuation
(6) Recharge
More than 10 m
More than 15 minutes
30
OK
OK
OK
OK
OK
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