robinair 34788 freon recovery machine refirgerant recycle machine meeting sae j2788 standard

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 Since July 20th 2003


Phone 660-334-0202

Robinair 34788NI

Freon Recovery Machine

We have all refrigerant recovery systems in stock

Ships within 24 Hours
Free Shipping


Thank you. I received the tool, and it worked well. This type of specialty tool is not easy to find. This is a great business and excellent customer service.
Thanks again, Steve D. Gaithersburg, MD

I appreciated your prompt and helpful information exchange through our e-mail communication and also your efficient timely handling of the shipping. You should get a 100% E-bay rating.
Thanks again, Gary B. Fonda, NY

  robinair 34788 air conditioning machine to recover freon from automotive systems

See Also our ROB34288 for $2,779.00

Robinair 34788 freon recycle recovery machine $3,129.00

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Cool-Tech 34788NI R134a Refrigerant Recovery, Recycling, Recharging Unit
To Order by Phone Call 660-334-0202
Availability: In Stock
Call 660-334-0202
Your Cost: $3,579.00

Includes Free Shipping

MSRP: $6,398.25
We now have the Software for Vehicles from 94 to 07

Filter Maintenance Kit for 34788

Operators Manual


The Cool-Tech 34788 combines simple operation with superior accuracy. The Cool-Tech 34788 recovers, recycles, evacuates, leak tests, and recharges R-134a quickly and accurately. Automatic operation means less attention is needed!

• Fully compliant with SAE J2788 standards!
• Recovers 20% More Refrigerant
• Charge Accuracy +/- 1/2 Ounce
• Control panel offers flat storage feature when not in use
• Database expansion slot
• Two large tool storage areas
• Change between traditional & hybrid vehicle systems without fear of cross contamination with improved oil injection
• New 2X larger display makes the 34788 easier than ever to use
• Built-in storage for extra filter
• On-board storage for compressor oils

• Vacuum Leak Test - Will monitor the vacuum level after an evacuation, and inform the technician of a possible leak in the vehicle's A/C system.
• Automatic Refrigerant Refill - With this latest advance, you never have to stop in the middle of a job to change refriderant taks. The unit maintains a user selectable amount of refrigerant in an internal vessel, and signals when it's time to change the supply tank, so no monitoring is required.
• Automatic Air Purge - Eliminates damaging air without any monitoring of gauges or opening of valves.
• Automatic Oil Drain - The unit automatically drains system oil captured during recovery, and the display reminds you to empty the bottle. Graduations on the container clearly show you how much oil needs to be replaced.
• Refrigerant Charging - Has never been this easy. Select a charge mode from either the high side, low side, or both. Accuracy features eliminate guesswork!
• Refrigerant Management Systems - New and improved, system displays refrigerant use and monitors remaining filter life. Prompts appear when 1/3 of filter life remains.
• Vacuum Function - Defaults to 15 minutes, but is programmable up to 99 minutes. Remaining vacuum time is displayed on the screen.
34788 (top down)
Cool-Tech 34788NI
Weight: 0 lbs.

The Cool-Tech 34788 combines simple operation with superior accuracy. It recovers, recycles, evacuates, leak tests, and recharges R-134a quickly and accurately. Fully automatic function lets you recover, vacuum, leak test, charge, and then walk away. Other features and functions:
  • Vacuum Leak Test
  • Automatic Refrigerant Refill
  • Automatic Air Purge
  • Automatic Oil Drain
  • Refrigerant Charging
  • Refrigerant Management
  • Vacuum Function
  • 34788 (back view)
    Cool-Tech 34788
    Weight: 0 lbs.

    The Cool-Tech 34788 combines simple operation with superior accuracy. It recovers, recycles, evacuates, leak tests, and recharges R-134a quickly and accurately. Fully automatic function lets you recover, vacuum, leak test, charge, and then walk away. Other features and functions:

    freon recovery machine, robinair 34788 freon recovery machine



    Manual Air Purge
    Removes air from the internal storage vessel. The gauges on the control panel show when to purge the air.

    Oil Drain
    The display reminds you to drain the system oil captured during recovery. Graduations on the container clearly show you how much oil needs to be replaced.

    Oil Inject
    System prompts user to inject oil before charge. O-ring on oil reservoir provides visual reference on graduated container.

    Electronic Scale
    The scale is mounted internally for protection, and has a dampening mechanism that protects against impact shocks, such as movement over rough surfaces. The scale weighs recovered refrigerant and charges by weight for greatest accuracy.

    Internal Storage Vessel
    Refrigerant is recovered into and charged out of this vessel, which is permanently mounted to the electronic scale for continuing reliability.

    Internal Manifold
    Block manifold contains solenoids that control refrigerant flow, reducing the possibility of leaking connections.

    Maintenance Prompts
    System prompts user to change vacuum pump oil when needed.
    System prompts user to change filter-drier when needed.

    Easy to Use!
    Ergonomic Design-The cabinet is easy to maneuver between service bays and position near the vehicle.

    Gauges-The high and low side gauges are mounted at an angle that's easy to see.

    Unit of Measure-Select pounds or kilograms through the menu.

    Features that Speed Service
    • Robinair VacuMaster vacuum pump for fast, thorough pull-down.
    • Heavy-duty compressor pulls from both high and low sides during recovery.
    • Refrigerant recycling meets or exceeds SAE J2788.
    • Oil injector lets you add system oil in seconds.

    Air conditioning system operation

    The cycle begins in the compressor where the refrigerant is compressed to between 150 and 300 PSI depending on condenser temperature, which is effected by outside air temperature. The purpose of compressing the refrigerant is not only to increase the pressure but it also increases the temperature of the freon.

    The refrigerant then passes through the condenser where the temperature of the refrigerant is reduced by the cooler air passing through the fins and since the Freon is cooled but remains at a high pressure it will turn into a liquid inside the condenser.

    Expansion valve Evaporator
    When the Freon reaches the expansion valve the liquid is released as a low pressure liquid in to the evaporator allowing it to boil off into a gas. The pressure in the evaporator determines the temperature of the evaporator, a pressure of about 30 PSI will produce temperatures of about 30 degrees. As pressures inside the evaporator increase the temperature will also increase, thus diminishing cooling quality of the a/c system. If pressures fall below 30 PSI the temperatures will drop inside the evaporator to below freezing and condensation on the evaporator will begin to freeze which will restrict airflow through the evaporator fins, making it important to keep the pressure inside the evaporator between about 30 to 40 PSI. As the engine speeds vary so will the pressures in the evaporator because as engine speed increases the compressor turns faster pulling freon from the evaporator in greater volume. This makes it important to use a method to control pressure inside the evaporator.

    Clutch Cycle Switch
    The Clutch Cycle Switch is sometimes temperature operated, called a clutch thermostat, and some use a pressure switch that opens when evaporator pressure drops below 30 PSI (usually about 25 PSI) and closes when pressure reaches about 45 PSI. These systems control pressure by turning on and off the compressor. Some systems in the past used a device called a suction throttling valve that would keep the evaporator at the same pressure no matter what the compressor speed was. These allowed the compressor to turn all the time without the need to cycle the clutch.

    Why doesn’t my a/c cool?
    Low on refrigerant- If the system is low on refrigerant the pressure in the condenser will be too low to turn into a liquid and it reaches the expansion valve as a gas which when the pressure is released into the evaporator will cool very little.

    Has air in the system- A proper evacuation was not performed and there is air in the system which will not only raise pressures but will not turn into a liquid in the condenser. System needs to be recovered and evacuated. You can release the air from the recovery machine when it is prompted.

    System has too much oil in it.- Many times when a system is charged, oil will be added to the system, if too much oil is added, it will displace the freon in the system and will cool poorly. When you evacuate a system and get an abnormal amount of oil it might be well to flush the system and add the right amount of oil.

    Too much freon- Too much of a good thing is wonderful! is what my uncle use to tell me, but not when it comes to freon. It will run extreme high pressures and can damage the compressor or blow a line. Be careful not to add to much freon, if in doubt recover the system and then put back into it just the amount that is called for by the manufacture.

    Compressor is bad-The compressor has bad reed valves or a problem that it is not compressing the refrigerant enough to obtain a liquid in the condenser and not keeping the evaporator at a low enough pressure.

    Restriction in a line-It is common to see a restriction in the condenser, which can be spotted by a large drop in temperature of the condenser with an infared temperature gun. A restriction will act as an expansion valve allowing the refrigerant to turn into a gas before reaching the evaporator.

    Defective or restricted Expansion Valve-An expansion valve that is plugged or restricted will not allow freon through to cool down the evaporator. It will have very low pressure on the suction side of the compressor and not cool well. System Oil
    Mineral based oil was used with R-12 refrigerant but is not compatible with R134 systems. The ester based oil is best used when converting a system from R-12 to R134 because it is compatible with both and mixes well with mineral based oil. The Pag oil is only usable in the R134 system and is not compatible with R-12 refrigerant or mineral based oil. You can also get ester based oil with a leak detecting dye in it, to use with a blue light to find leaks.

    Freon Recovery Machine Certification

    Use of a Freon or refrigerant recovery machine requires a license which enables you to buy R-12 refrigerant, and teaches the guidelines for proper disposal and handling of refrigerants. You can study and take a license test online at for a cost of $15.00.

    Using a Freon or Refrigerant Recovery Machine

    The use of a Freon or refrigerant recovery machine prior to opening a system for repair or replacement of defective components is both cost effective and environmentally safe. When a system is recovered the machine will tell how much Freon is removed, it will separate any oil that is removed and will also separate any air that may be in the system. This machine has an automatic oil inject system that will allow replacement of any oil that is lost or pulled out of the system during recovery or evacuation.

    After any repairs are made to the system and before a unit can be charged it must be evacuated. This will remove any air and moisture that is in the system, and should be evacuated for a minimum of 15 minutes to an hour depending on how long the system was open.

    The amount of refrigerant that is allowed into the system is programmed in and the charge cycle begins. The proper amount can be found on most systems on a sticker under the hood, or in a repair manual. When charging is complete the system should be rechecked for leaks before the vehicle is done and ready to be returned to the customer.



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