Quote:
Originally Posted by db_cooper
At 2000 rpm your pulling a vacuum! on the low side and 126 on the high side?
I would normally say the expansion valve is defective (almost closed) it is not passing refrigerant effectively and not enough refrigerant remaining on the high side for the compressor to pump up normally. You may get some uber cold vent temps with HC12a with those pressure readings. HC12a gets very cold when undercharged..which is what the pressures act like too.
A/C compressor won't last long though pulling a vacuum on the low side all the time. No oil flowing in the refrigerant and hard work on the compressor internals.
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Howdy DB
FYI, I hold a valid US Government EPA Federal "UNIVERSAL LICENSE", for ANY refrigerant or type of system Certification THAT encompass everything and is also recognized worldwide by all United Nations Signatories; NOT a lowly limited State technicians License
The compressor used in THE BLACK SWAN is working absolutely perfectly as intended for optimal a/c cooling with the least amount of refrigerant with these pressures I posted using R134A as well as all of the components in the system! The evaporator is not freezing as well as the evap blower set on low speed and putting out vent temps in the mid-30s F, the PFC’s heat exchange for both is perfect, The thermal expansion valve has been modified and the superheat has been set perfectly. The system is working optimally for peak efficacy in perfect balance @ these pressures
• What are HC-12aŽ and OZ-12Ž?
HC-12aŽ and OZ-12Ž brand hydrocarbon refrigerant blends are flammable refrigerants. Their primary components are hydrocarbons, which are flammable substances such as propane and butane. HC-12aŽ and OZ-12Ž are registered trademarks of OZ Technology, Inc. HC-12aŽ has been marketed since 1994. OZ-12Ž was a similar blend marketed until the introduction of HC-12aŽ . Both products have been reviewed by EPA under the Significant New Alternatives Policy (SNAP) program. More information about the SNAP program is available from the hotline listed at the top of this page.
Note that EPA refers to the chemical composition of HC-12aŽ as Hydrocarbon Blend B. EPA considers any substance with that chemical composition, no matter what its trade name is, to be Hydrocarbon Blend B and to have the same legal status that HC-12aŽ has.
In order to meet Department of Transportation requirements for shipping HC-12aŽ in six-ounce cans (DOT refers to these cans as DOT 2Q containers), OZ Technology reduced the vapor pressure of HC-12aŽ in June, 1998 by changing the composition. EPA does not consider this reformulated HC-12aŽ to be the same as Hydrocarbon Blend B. The reformulated HC-12aŽ has not been submitted for SNAP review, and thus cannot be marketed or used as a substitute for ozone-depleting substances.
• What is DURACOOL 12aŽ? Is there a difference between HC-12aŽ and DURACOOL 12aŽ?
DURACOOL 12aŽ has the same chemical composition as the HC-12aŽ formulation that was submitted for SNAP review and was called Hydrocarbon Blend B. Both HC-12aŽ and DURACOOL 12aŽ are different than the new formulation of HC-12aŽ in six-ounce cans. DURACOOL 12aŽ is the registered trademark of Duracool Limited, the Canadian company that has manufactured DURACOOL 12aŽ since 1997. Duracool Limited and OZ Technology, the manufacturer of HC-12aŽ, are separate, unrelated companies with their own manufacturing facilities and distribution mechanisms.
• What is the legal status of hydrocarbon refrigerants such as HC-12aŽ and DURACOOLŽ?
It has been illegal since July 13, 1995 to replace CFC-12 with the HC-12aŽ formulation that was submitted for SNAP review in any refrigeration or A/C application other than industrial process refrigeration. The same prohibition for OZ-12Ž took effect on April 18, 1994. Because DURACOOL 12aŽ has the same chemical composition as the HC-12aŽ formulation that was submitted for SNAP review (i.e., Hydrocarbon Blend B), DURACOOL 12aŽ is also subject to the same restrictions.
HC-12aŽ, as reformulated to meet DOT requirements, is not the same as Hydrocarbon Blend B and has not been submitted for SNAP review. OZ Technology is therefore prohibited from marketing this blend as a substitute for any ozone-depleting substance. In addition, any use of this blend as a substitute for CFC-12 or any other ozone-depleting chemical, in industrial process refrigeration or any other refrigeration or A/C end use, is prohibited under the Clean Air Act.
Since HC-12aŽ, as submitted for SNAP review, is chemically different from HC-12aŽ, as reformulated to meet DOT requirements, and since it has a different legal status under the Clean Air Act, users of any substance marketed as HC-12aŽ should be aware of which HC-12aŽ they have purchased.
Note: Many states prohibit using flammable refrigerants in motor vehicles, regardless of which original refrigerant was used in the vehicle.
• May hydrocarbon refrigerants be used to replace CFC-12, commonly referred to as "FreonŽ ," in cars?
No. It is illegal to use hydrocarbon refrigerants like HC-12aŽ and DURACOOL 12aŽ as substitutes for CFC-12 in automobile or truck air conditioning under any circumstances.
Not a good IDEA, this refrigerant is flammable and can explode causing great injury or all kinds of damage, and why it is illegal to use in an automobile or truck
Your thinking "A/C compressor won't last long though pulling a vacuum on the low side all the time. No oil flowing in the refrigerant and hard work on the compressor internals." IS SIMPLY WRONG! There will be no damage to the compressor as long as it has the right amount OIL in it and correct for the gas used,