Robinair 22791 Infrared Refrigerant Leak Detector - Manual (Page 6)

service valves with caps in place, brazed or welded areas,
and areas around attachment points and hold-downs on
lines and components. If looking for an apparently larger
leak, check first at the 7 g/yr or 14 g/yr position.
C. Always follow the refrigerant system around in a continu-
ous path so no areas of potential leaks are missed. If a
leak is found, continue to test the remainder of the system.
D. Recheck service valves with caps removed. Blow shop air
over service valve to clear immediate area, and then check
with detector on 7 g/yr setting.
E. Move the detector at a rate of no more than 75 mm/sec
(3 in/sec) and as close as possible to 9.5 mm (3/8 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 likelihood of finding a leak. However,
detectors made to meet this standard are based on air
sampling from the 9.5 mm (3/8 in) distance. 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 with a moving probe test at that
location, taking care to maintain the small gap (9.5 mm or
3/8 in) to confirm the leak is of repairable size. Use of the
7 g/yr (0.25 oz/yr) position of the detector, after finding an
apparent leak with the 4 g/yr (0.15 oz/yr) setting, may also
be helpful.
G. No. 22791 is sensitive and can take up to 30 seconds to
clear after detecting a small amount of contaminant. It will
typically clear in 2 to 15 seconds.
Caution: Do not use cleaning agents or solvents on or near
A/C lines. Wipe away dirt or potential false-trigger chemicals by
using a dry towel or shop air.