CO
2
Leak Detector
15
(D)Recheck service valves with caps removed. Air
clean the service valve to clear the immediate
area, and then check with detector with
medium sensitivity setting.
(E)Move the detector at the speed no more than
75 mm/sec (3 in/sec) and as close as possible
to 6 mm (1/4 in) from the surface, completely
encircling each test position (switch, sensor,
refrigerant tubing connection, etc).
(F)Slower movement and closer approach of the
probe normally improve the possibility of finding
a leak. However, detectors made to meet this
standard are based on air sampling from the 6
mm (1/4 in). Retest is advisable when a leak
appears to be found at the most sensitive
settings, particularly if the probe was in a static
position on a joint, or making physical contact
with a joint, as it was moving. Repeat the test
by moving probe around that location, taking
care to maintain the small gap (6 mm or 1/4 in)
to confirm the leak is of repairable size. Use of
the 15 g/yr position of the detector, after finding
an apparent leak with the 6 g/yr setting, may
also be helpful.
(G) The leak detector is sensitive and can take up
to 30 seconds to clear after detecting a small
