Is R12 higher pressure than R134a?
R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. Bottom line, R134a simply doesn’t cool as well as R12. R12 systems used mineral oil, but unfortunately mineral oil doesn’t dissolve in R134a. So, along with R134a came a new oil: Polyalkylene Glycol—or PAG oil.
Can I use 134a in a R12 system?
In order to legally use R134a refrigerant in an R12 system, it must be converted or retrofitted to be able to properly use R134a, and all R12 must be properly discharged and captured prior to charging with R134a.
What pressure should R12 run at?
R12 should run about 30-35 psi suction for auto AC. R134a is practically the same, but slightly lower – it has a very similar pressure/temperature relationship to R12, especially on the low side.
What are normal operating pressures for R134a?
R134a Pressure Gauge Chart
| Ambient Temperature (°F) | Low Side | High Side |
|---|---|---|
| 80° | 45-50 psi | 175-220 psi |
| 75° | 40-45 psi | 150-175 psi |
| 70° | 35-40 psi | 140-165 psi |
| 65° | 25-35 psi | 135-155 psi |
What is special about R12 hoses compared to R134a?
The hose has an extra liner for higher pressure and to prevent leakage of the easy to leak out R134a. From what I understand the molecule is smaller for R134a thus it needs more of a barrier against leaking than the R12 hose has.
What is the difference between R12 and 134a?
R12 and 134a are refrigerants used in car air conditioning systems. The main difference between the two is that R12 is the amount of time they remain in earth’s atmosphere, with the newer 134a significantly less than the old R12.
How do you convert R12 to R134a?
How to Convert an R12 to the R134a System
- Discard any R12 refrigerant still in the system by taking your vehicle to a licensed air-conditioning professional.
- Open the engine compartment of your vehicle.
- Push the high side retrofit R134a fitting over the old fitting and use a wrench to tighten it.
Which refrigerant has the highest critical pressure?
∴ Ammonia has the highest critical point pressure.
What is a drop in replacement for R12?
RS-24 is a “Drop-in” alternative for R12 which also provides a long term solution at the same time. It provides, therefore, a one change solution to the replacement of R12 at minimal expense.
What should AC high and low pressure be?
An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side.
What is the normal operating pressure for a R134a?
What are the Normal Operating Pressures for R134a? The pressure for an ordinarily operating R134a is between 22 and 57 pounds per square inch (PSI). Remember, there are two sides to the chart; we have the low and the high. Therefore in a normal R134a, the low-pressure side is 90 degrees or less, and the PSI should be close to 30.
What do you need to know about R-134a?
One of the very first steps is to check the pressure of your system. Understanding the pressure that your system is at as well as knowing what the saturation point is of R-134a will allow you to properly diagnose what is wrong with your system.
What is the boiling point of HFC refrigerant R134a?
r134a is an HFC refrigerant. R-11 is a fluorocarbon of the methane series and has a boiling point of 23.7°C at atmospheric pressure. Like other fluorocarbon compounds, it dissolves natural rubber. It is non-corrosive, non-toxic, non-flammable.
What should the pressure be on a refrigerant?
The pressure gauges for this refrigerant stays between 22 PSI and 57 PSI (pounds per square inch). But you have to keep in mind that there are two different sides to this chart. And you have to consider the low as well as the high side.