WTK-SVN001-EN
9
Gas Leakage Inspection
Gas Leakage Inspection
After charging with refrigerant,
it is necessary to check gas leakage.
Inspecting gas leakage should be
done with special precaution. If there
is any leakage that we are unable to
find, afterwards the system would be
damage. For example, if R22
refrigerant loses, cooling coil will be
frozen. There are so many methods to
inspect leakage, but the easiest and
the most economical way is to use
nitrogen gas detector and bubble of
powder detergent per the following
steps:-
• Prepare nitrogen tube with pressure
regulator and pressure gauge or
manifold gauge.
• Open service valve cover (at the
suction side).
• Connect gauge line to the nitrogen
tank, but do not open nitrogen
valve at the nitrogen tank.
• Check out brazing track and all
valves such as flare union.
• Connect the other tails of gauge
line to the service valve (at the
suction side).
• Slowly open nitrogen valve,
let pressure gradually increase until
250 pound/square inches, then put
bubble of powder detergent around
all connected joints, notice any
leakage. Fix the leakage, if any.
If there is no leakage, leave 1-2 hours
to check whether the pressure stays
the same. If the pressure is still
reducing, we need to check leakage
again. Finally, release nitrogen gas
in order to make refrigerant system
to be under vacuum.
Caution
• Do not fully open nitrogen valve to
250 psig because valve may be
damage.
• Do not forget to check the leakage
at the access valve both at the
liquid line and at the suction line.
