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Service Tips

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AC Recovery Equipment


Always wipe the service fittings on the vehicle with a rag to remove any accumulated dirt. This will protect the O rings in the couplers from scratches and damage. Damaged O rings can allow the recovery unit to suck in air during recovery and vacuum and leak refrigerant during charge or recovery. This can lead to high pressure errors.


Check on the AC unit from time to time during recovery. Most units are designed to shut down when the AC system is pulled down to about 10" of vacuum. If the system has a leak, it may never get down to that vacuum and the recovery unit will continue to pull in air until it fills the internal tank to about 450 psi. At this point the recovery unit will shut down and display "High Pressure Error". You are then locked out of the unit and will be unable to operate it until the pressure is relieved.

Test & Confirm Type of Refrigerant

If you have any doubt about the type of refrigerant in a vehicle use an identifier to check. If you pull the wrong type of refrigerant into a recovery unit, you will have purge issues. Typical repairs to a contaminated recovery unit can run as high as $2500.00 by the time we replace the internal tank, filter, and flush the manifold, compressor and vacuum pump.

Test for Sealant

Similar to the wrong type of refrigerant is a system that contains sealant. There are sealant detectors available if you are in doubt. Sealant is designed to harden and seal a leak when the sealant is exposed to the air. Great for a small leak in an AC system, but in a recovery unit will cause all kinds of trouble — blocked check valves, blocked solenoids and orifices.

Should this occur the warranty (if applicable) is immediately void, as per Robinair, Mac Tools, Snap on, CPS, and most other manufacturers. Typical cost to repair is $1500.00 to $3000.00 and comes with no warranty whatsoever. It is almost impossible to get all of the sealant the first time we go through a unit. It usually requires at least 2 or 3 repairs to clear it all.

Complete the Process

Always allow the recovery unit to complete the oil drain at the end of the cycle, and any other processes. You need to know how much oil came out of the vehicle so you can replace it. You also need to let the recovery unit drain the oil from the accumulator. If you do not allow it to drain, the oil can build up to a level that will allow it to be sucked into the filter and compressor. The compressor will fail if liquid is allowed to get to it. Liquids can not be compressed and will usually damage the input and/or output reed valves. at that point a new compressor is required.

Keep Refrigerant in the Unit

Make sure you maintain about 10 lbs of refrigerant in the recovery tank. Charging relies on a pressure differential between the recovery tank and the AC system in the vehicle. The liquid line on the recovery tank does not go all the way to the bottom of the tank. You usually need to have about 4 lbs in the tank to call it empty.

Vacuum Time

When pulling a vacuum on an AC system, (minimum of 15 minutes) the longer you pull a vacuum the more moisture you will remove from the system. Moisture and R134A combine to form an acid that eats aluminium from the inside out. The more moisture you can remove, the better. Just because you pulled the system down to 28" of vacuum in 5 minutes, does not mean you can go straight to the charge process. It takes time for the water to boil off at 28" vacuum and be removed from the system.

When recovering from a vehicle with a known leak, stay with the unit and watch for the gauges to reach zero. Then close the service couplers and let the unit complete the recovery cycle. By doing this you can avoid pulling excess air into the internal tank and causing a high pressure error, while recovering any refrigerant left in the vehicle.

A comparison between “off-brand” service filters and Robinair OEM service filters

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OTC Genisys Charge Procedure

  • The Genisys scan tool has gone through three model generations
  • Original NGT Genisys had a black power button
  • Pro Genisys had the red power button
  • EVO Genisys now has the blue trimmed box

Nickel Metal Hydrate Batteries:

A nickel-metal hydride cell, abbreviated NiMH, is a type of rechargeable battery similar to the nickel-cadmium cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel-cadmium battery. Compared to the lithium-ion cell, the volumetric energy density is similar but self-discharge is higher. NiMH batteries charge at a high rate of current and caution must be used not to over charge or they will actually loose their charge and the tool will prematurely shut down

Charge Times:

  • NGT Genisys do not exceed an 8 hour charge
  • Pro Genisys do not exceed a 4 hour charge (3 hours recommended)
  • EVO Genisys do not exceed a 4 hour charge (3 hours recommended)

RMS2134 Oil Drain Procedure

During Recovery:

  • Low gauge must have at least 10psi
  • Drain from "waste oil"

After recovery:

  • ISV must have at least 50psi
  • Close service valves
  • Open vacuum & Refrigerant valves
  • Drain from "waste oil"
  • Close refrigerant valve
  • Turn unit on to recover refrigerant from compressor
  • Close vacuum valve

RMS2134 Compressor oil level check procedure:

  • Tip unit 30 degrees to the left
  • Older units to be tipped 30 degrees to the front
  • Follow "After Recovery" pressure procedure above and drain from "oil level / fill"


Rim Clamp Tire Changer Maintenance Tips (PDF)

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