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TM5-4120-375-14
5-16. Leak Checking (cont.).
(1).
ELECTRONIC LEAK DETECTOR.
Turn the electronic unit on and
slowly pass the probe around all points of the refrigeration
system at which a leak could exist.
Depending upon the type
of detector used, a leak will be indicated by an audible
signal light, or by meter deflections.
(2) .
SOAP SOLUTION.
Brush soap solution on all possible points of
leakage and watch for bubbles.
Follow a definite sequence to
avoid missing any joints that should be tested.
Wipe the
solution from all joints and mark any point at which a leak
is found.
(3).
Discharge the system after leak checking by connecting a hose
to the suction service valve and cracking the valve open
slightly to slowly discharge the gas. Rapid discharge will
cause oil to be blown out of the compressor.
If leaks were
detected, repair them and retest in accordance with
paragraph 5-19 thru 5-24.
If the system is leak tight,
double evacuate and charge the system in accordance with
paragraph 5-18.
5-14
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