Robinair 22791 Infrared Refrigerant Leak Detector - Manual (Page 5)

Mute Button
Press the MUTE button to toggle the audio portion of No. 22791
ON or OFF.
Peak Button
The PEAK function stores the highest change in refrigerant
concentration achieved while continuing to detect leaks. Press
the PEAK button to toggle this function ON and OFF. The PEAK
LED illuminates when this function is turned on. Turning the PEAK
function off clears the peak information.
Contaminate Mode
To detect even the smallest leak in refrigerant-contaminated
environments, press the PEAK button rapidly four times. The
green LED will flash rapidly to show contamination mode is
on. Press the PEAK button rapidly four times again to turn
contamination mode off.
Leak Detection Procedure
1. Press and hold the ON/OFF button for one second. The warm-
up and calibration sequence takes approximately 30 seconds.
The sensitivity level defaults to HIGH at startup.
2. The most likely place for a refrigerant leak is at soldered joints
in refrigerant lines and changes in cross section or direction
of these lines. No. 22791 detects changes in concentration
of refrigerant, not the absolute concentration of refrigerant.
This allows the detection of leaks in locations that may have
refrigerant in the air. Use the following “double pass” method
to find leaks from the detection of change in refrigerant
concentration. Leak test with the engine off.
A. Charge the system with sufficient refrigerant to have a
gauge pressure of at least 340 kPa (50 psi) with the system
off. At ambient temperatures below 15°C, leaks may not be
measurable because the pressure may not be reached.
B. Visually trace the entire refrigerant system, and look for
signs of air conditioning lubricant leakage, damage, and
corrosion on all lines, hoses, and components. Check
each questionable area with the detector probe, as well
as all fittings, hose-to-line couplings, refrigerant controls,