No. 22791
Infrared Refrigerant
Leak Detector
Operator’s Manual
Manual del operador
Manuel de l’opérateur
Product Description
The Robinair No. 22791 uses infrared optics to create a refrigerant
leak detector that combines sensitivity, speed, battery life, portability,
and ease of use. This unit detects leaks as small as 0.15 oz/year,
and meets SAE J1627, J2791, and J2913 standards.
No. 22791 comes with a wall charger and a car charger for its
compact lithium-ion battery—which can power the leak detector
for up to eight hours of continuous operation before needing to
recharge. A choice of three sensitivity settings keep false alarms
to a minimum while allowing detection of even the smallest leak
in a refrigerant contaminated environment. A 30-second, selfcalibration test occurs whenever the unit is powered on to ensure
optimal performance. A built-in replaceable lter blocks moisture
and particulates, preventing damage to the sensor.
Specications
Sensing element: enhanced infrared photo optics
Refrigerants: HFC, CFC, HCFC, blends, and HFO-1234yf
Sensitivity level (per SAE J2791 and J2913):
HIGH: 0.15 oz/year and higher
MED: 0.25 oz/year and higher
LOW: 0.5 oz/year and higher
Response time: less than one second
Battery life: up to 8 hours continuous use before recharge
Auto OFF: 10 minutes of inactivity
Battery: 3.7V, 1880 mAH rechargeable, lithium-ion (No. 74364)
Low battery LED: illuminates when 1 hour of battery life remains
Charge time: less than 4 hours @ 500 mA
Operating environment: 32ºF (0°C) to 122ºF (50°C) at <75% RH
Storage environment: <80% RH for detector and battery
For 80% battery recovery:
-4ºF (-20°C) to 140ºF (60°C) less than 1 month
-4ºF (-20°C) to 113ºF (45°C) less than 3 months
-4ºF (-20°C) to 68ºF (20°C) less than 1 year
Accessories included: wall charger, car charger, storage case,
battery (installed), and operator’s manual.
Safety Precautions
Warning: To prevent personal injury and/or equipment damage,
l Read, understand, and follow all warnings stated in the
Lithium Battery Care section of this manual.
l DO NOT charge the battery with any charger other than
the chargers supplied with the unit.
lDONOTuseNo.22791withoutacleanltercorrectly
installed in the tip.
l DO NOT draw moisture in through the probe.
Lithium Battery Care
No. 22791 operates on a lithium-ion type NP-120 battery. For long
battery life and safe operation, observe all warnings.
Warning: To prevent personal injury and/or equipment damage,
l
Do not disassemble or attempt to repair the battery or
protective circuit.
l
Never attempt to charge the battery if it has been removed
from the unit.
l
Do not expose the battery to temperatures above 140°F
(60°C).
l
Donotchargethebatterynearareorinahotvehicleor
direct sunlight.
l
Do not solder directly on the battery.
l
Do not subject the battery to impact.
l
Do not expose the battery to moisture or immerse it
inuid.
l
Do not deform, pierce, or damage the battery.
l
Do not touch a battery that is leaking electrolytes. If
batteryuidshouldgetinyoureyes,ushwithfresh
water, do not rub eyes, and see a physician immediately.
l
Do not use a battery if it is deformed, smells bad,
changes color, or appears abnormal. Send the unit in for a
replacement battery immediately.
Charging the Lithium Battery
Two types of chargers are supplied with No. 22791 leak detector.
The AC charger plugs into a wall outlet (100–240 VAC, 50/60 Hz);
the car charger plugs into a vehicle cigarette lighter DC plug.
1. BEFORE USING THE UNIT THE FIRST TIME:
Fully charge the battery. The unit was packaged and shipped
from the factory with the battery only partially charged.
2. WHEN THE BATTERY IS LOW:
The LOW-BATT LED will illuminate in red.
3. TO RECHARGE NO. 22791:
Plug one end of the charger into the top of the unit, and the
other end of the charger into the power source. The LOW-BATT
LED will blink while charging until the battery is fully charged.
NOTE: Always charge within the charging environment
specications of 32°F (0°C) to 122°F (50°C) at <75% RH.
4. AVOID DISCHARGING THE BATTERY COMPLETELY.
Recharging a partially discharged battery more frequently is
better for the life of a lithium-ion battery.
Functions and Settings
ON/OFF Protection
Press and hold the ON/OFF button for one second to turn
No. 22791 ON or OFF. This one-second delay protects against
accidental ON or OFF.
LED Bar Graph Display
The eight-segment LED display indicates the degree of change
in refrigerant concentration. As the concentration of refrigerant in
the air increases, the number of illuminated bars on the display
increases also.
L/M/H Button (Sensitivity Levels)
Set the unit’s sensitivity level by pressing the L/M/H button.
Low (L), medium (M), or high (H) sensitivity level is indicated by
its respective LED. The higher the background concentration of
refrigerant in the air, the lower the sensitivity level should be set.
To detect a very small leak in a high refrigerant background, use
the Contaminate Mode.
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 ash 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 warmup 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 nd leaks from the detection of change in refrigerant
concentration. Leak test with the engine off.
A.
Charge the system with sufcient 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 ttings, hose-to-line couplings, refrigerant controls,
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 rst 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 nding 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 conrm the leak is of repairable size. Use of the
7 g/yr (0.25 oz/yr) position of the detector, after nding 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.
If the 22791 does false trigger on a chemical listed below, allow
the leak detector to clear for a minimum time listed in the table.
SAE J2791 False-Trigger Test Results
Time to
Chemical Detection
Windshield washer solvent Yes 6
Ford spot and stain remover No Ford rust penetrant and inhibitor Yes 5
Ford gasket and trim adhesive Yes 6
Permatex Natural Blue cleaner and degreaser No Ford brake parts cleaner Yes 6
Ford clear silicone rubber No Motorcraft G-05 antifreeze / coolant No Gunk Liquid Wrench Yes 4
Ford pumice / lotion hand cleaner No Ford Motorcraft DOT-3 brake uid No Ford spray carburetor tune-up cleaner Yes 5
Ford silicone lubricant No Dexron automatic transmission uid No Mineral engine oil No -
Clear
(seconds)
Accessories and Replacement Parts
Optional Accessories Order No.
Extension Probe (9 inch) ......... 74367
Rigid Extension Probe ............. 74368
Replacement Parts Order No.
100–240 VAC Charger ............ 74361
Std. Europe Plug Adapter ........ 74115
Great Britain Plug Adapter ...... 74116
12V DC Charger ...................... 74362
Filters (5) and O-rings (3) ........ 74363
Lithium-ion Battery .................. 74364
Sensor Tip ............................... 74365
Filter Replacement
A lter, located in the tip of the wand, blocks moisture and other
contaminants from the sensor. When this lter becomes wet, it
restricts the ow of air and must be replaced.
To replace the lter:
1. Unscrew and remove the tip of the sensor to expose the white
lter.
2. Remove and discard the lter.
3. Position a new lter in the tip so the round end of the lter is
closest to the tip of the wand.
NOTE: Use only Robinair supplied replacement lters.
Storage
The battery should have a 40%-50% charge during prolonged
storage of a month or longer. The correct storage environment is
critical to battery life.
Storage environment: <80% RH for detector and battery.
For 80% battery recovery:
-4ºF (-20°C) to 140ºF (60°C) less than 1 month
-4ºF (-20°C) to 113ºF (45°C) less than 3 months
-4ºF (-20°C) to 68ºF (20°C) less than 1 year
NOTE: Battery life will be reduced signicantly if the battery is
stored with a full charge and/or at high temperatures.
Warranty
This product has been produced to provide unlimited service. Should
it become inoperable after the user has performed the recommended
maintenance, a no-charge repair or replacement will be made to the
original purchaser. This applies to all repairable units that have not
been damaged or tampered with. The claim must be made within
ONE YEAR of the date of purchase.
Garantía
Este producto se produjo para proporcionar servicio ilimitado. Si llegara
a dejar de funcionar después de que el usuario ha llevado a cabo el
mantenimiento adecuado, se hará un cambio o reparación sin cargo
al comprador original. Esto aplica a todas las unidades reparables
que no se han dañado ni alterado. El reclamo debe realizarse en el
período de UN AÑO a partir de la fecha de la compra.
Garantie
Ce produit a été conçu pour offrir un service illimité. Si celui-ci devenait
inopérant après que l’utilisateur aie effectué l’entretien recommandé,
une réparation ou un remplacement sans frais sera fait au bénéce de
l’acheteur original. Ceci s’applique à toutes les unités réparables qui
n’ont pas été endommagées ou traquées. La réclamation doit être
effectuée en dedans d’UNE ANNÉE de la date de l’achat.
655 EISENHOWER DRIVE
OWATONNA, MN 55060 USA
TECH SERVICES: 1-800-822-5561
FAX: 1-866-259-1241
CUSTOMER SERVICE: 1-800-533-6127
FAX: 1-800-322-2890
WEBSITE: WWW.ROBINAIR.COM
550029
Rev. F, May 20, 2013 © Service Solutions U.S. LLC
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