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34288 R134a Refrigerant Recovery,
Recycling, Recharging Unit
Availability: In Stock Ships Via:
Includes Free Shipping MSRP: $4,999.99
Order by Phone Call
The Cool-Tech 34288 combines
simple operation with
superior accuracy. The
Cool-Tech 34288 recovers,
recycles, evacuates, leak
tests, and recharges R-134a
quickly and accurately.
Combines simple operation
with superior accuracy.
evacuates, and recharges
R-134a quickly and
operation means less
attention is needed!
Automatic Recovery - When
this mode is selected, the
34288 looks for pressure
from the vehicle and
proceeds if the pressures
• 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
• Refrigerant Charging - Has
never been this easy. Select
a charge mode from either
the low side, or low side
and high side. Accurately
guesswork! (manual operation
using panel valves)
• New Display - The new,
easier-to-read 4x20 display
capability - The user can
select English, Spanish, or
• Refrigerant Management
Systems - New and improved,
system displays refrigerant
use and monitors remaining
filter life. Prompts appear
when 1/3 of filter life
• Vacuum Function - Defaults
to 15 minutes, but is
programmable up to 99
minutes. Remaining time is
displayed on the screen.
Manual Air Purge
Removes air from the internal storage vessel. The gauges on the control panel show when to purge the air.
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.
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.
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 imaca.org 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.