In Case Refrigerant Is Leaking - Sanyo SAP–KR184GJ Technical & Service Manual

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 utiliz-
ing 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 of evacuation
Length of tubing
Time
(6) Recharging
• Recharge unit in the same manner explained on the
previous page "(5) Recharging".
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 meters
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 meters
More than 15 minutes
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OK
OK
OK
OK
OK