is present, it should be wiped off with a dry shop
towel or blown off with shop air. No cleaners or
solvents should be used, since the detector may
be sensitive to their ingredients.
3. Visually trace the entire refrigerant system and
look for signs of air conditioning lubricant leakage,
damage, and corrosion on all lines, hoses, and
components. Each questionable area should be
carefully checked with the detector controls,
service ports with caps in place, brazed or welded
areas, and areas around attachment points and
hold-down on lines and components.
4. Always follow the refrigerant system around in a
continuous path so that no areas of potential leaks
are missed. If a leak is found, always continue to
test the remainder of the system.
5. At each area checked, the probe should be moved
around the location at a rate no more than1-2 in/s
(25 to 50mm/s), and no more than .2" (5mm) from
the surface, completely around the position. Slower
and closer movement of the probe greatly improves
the likelihood of finding a leak.
6. An apparent leak shall be verified at least once by
blowing shop air into the area of the suspected
leak, if necessary, and repeating the check of the
area. In cases of very large leaks, blowing out the
area with shop air often helps locate the exact
position of the leak.
7. Leak testing to the evaporator core while in the air
conditioning module shall be accomplished by
turning the air conditioning blower on high for a
period of 15 seconds minimum, shutting it off, then
waiting for the refrigerant to accumulate in the
case for ten minutes. Next, insert the leak detector
probe into the blower resistor block or condensate
drain hole if no water is present, or into the closest
opening in the heating/ventilation/air conditioning
case to the evaporator, such as the heater duct or
a vent duct. If the detector alarm sounds, a leak
apparently has been found.
8. Following any service to the refrigerant system,
and any other service that disturbs the refrigerant
system, a leak test of the repair and of the service
ports of the refrigerant system should be done.
• WINDY CONDITIONS: Locating leaks under windy
conditions may severely impede the leak searching
process. Even very large leaks may be impossible
to find as the escaping gas is quickly dissipated
into the atmosphere. If necessary, fabricate a gas
trap using aluminum foil around joints or fittings or
otherwise shield the search area from the wind.
• WHEN TO RESET THE UNIT: It is necessary to
reset the LS3000 during a leak search if the unit
becomes fully saturated, multiple leaks are present
or during the leak verification process.
• LEAK VERIFICATION: If a suspected leak is
OPERATING TIPS
3