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HEATING AND AIR CONDITIONING
AIR CONDITIONING SYSTEM
LEAK TESTING
External leaks in the system can be located us-
ing electronic detector J 29547 or halide torch J
6084.
The electronic leak detector is recommended
because it is light, accurate and most important,
does not expose the user to toxic gas fumes.
The halide torch requires an open flame for leak
detection. When R-12 is exposed to an open
flame, it turns into Phosgene gas which is
poisonous.
Procedures for using the two leak detectors are
as follows.
# Begin leak testing. Move the flexible probe
slowly under all suspect connections, joints
and seals.
NOTE: Because R-12 refrigerant is heavier than
air, leaks are more readily detected on the low-
er side of components being checked.
The leak indicator light will illuminate when a
leak is detected.
NOTE: The indicator light will go out if the probe
tip is held near the leak point for an extended
period.
Repair leaks as required.
Leak Testing With Electronic Detector J 21547
NOTE: Leak detector J 29547 will locate R-12
leaks as small as one-half ounce per year.
Calibrate the detector as outlined in the manu-
facturer's instructions.
Remove the flexible detector probe from the
case.
Turn the detector control switch On.
Prepare the detector for use.
# Place the flexible probe tip near the leak port
on the detector.
Evacuate and recharge the system after leaks
are corrected.
Leak Testing With Halide Torch J 6084
The torch is fueled by propane gas contained in
the cylinder (4). The gas heats a copper reactor
ring mounted in the stove (2) at the top of the
torch. Air entering the search hose (5) is drawn
into the stove and into contact with the reactor
ring. If R-12 is present in the area being tested,
the normally light blue flame will change to
green or a purplish-blue color.
• Adjust the BAT thumbwheel a few teeth at a
time, until the light illuminates-then goes out
when the tip is removed from the leak port.
•28
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Troubleshooting
