8
OPERATING FEATURES
HI300 TSCE-J1 Recommended Procedure
NOTE:On Automotive NC Systems leak test with the engine not in operation.
1. The air conditioning or refrigeration system should be charged with sufficient refrigerant to have a gauge
,pressure of at least 340 kpa(50 psi) when not in operation.At temperatures below 15°C(59°F), leaks may not be
measurable, since this pressure may not be reached.
2. Take care not to contaminate the detector probe tip if the part being tested is contaminaled.if the part is
particularly dirty, or condensate(moisture)is present, it should be wiped off with a dry shop tower or blown off
with shop air .No cleaners or solvents should be used, since the detector maybe 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 probe,as well as all fittings, hoses to line couplings, refrigerant controls, service ports with caps in place,
brazed or welded areas, and areas around attachment points and hold- downs 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 than 25 to 50mm/
second(1-2in/second). And no more than 5mm(1/4in) from the surface, completely around the position. Slower
and closer movement of the probe greatly improves the likelihood. of finding a leak (see fig.6).
6. An apparent leak shall be verified at least once as floolws:, a)Blow shop air into the area of the suspected leak,if
nebessary,and repeat the check of the area.ln cases of very large leaks,blowing out the area with shop air often
helps locate the exact position of the leak. b)First move the probe to fresh air and reset. Then hold the probe tip a
close as possible to the indicated leak source and slowly move around it until the leak is confirmed.
Automotive A/C Systems only- 7. Leak testing of the evaporalor 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 retrigerant to accumulate in the case for 10 minutes.
After such time,insert the leak detector probe into the blower resistor block or condensate drain hole,if no water
is present,or into the closet opening in the heat- ing/ventilation/air conditioning case to the evaporator,such as
the heater duct or a vent duct.lf the detector alarms,a leak apparently has been found.
All systems- 8.Following any service to the refrigerant system and any other service which disturbs the refrigerant
system.A leak test of the repair and of the service parts of the refrigerant system should be done.