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 automotive AC pressures?
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 a pressure temperature chart?
The pressure-temperature (PT) chart is a valuable tool that service technicians use to check proper system operation. Traditional PT charts list the saturated refrigerant pressure, in psig, with a column for temperature down the left side.
Is R12 freon?
R12 (also known as “Freon”) is a CFC (chlorofluorocarbon), specifically dichlorodifluoromethane, and R134a is a hydrofluorocarbon (HFC), meaning both have different chemical makeups. Additionally, CFCs are known to be damaging to the ozone, which is why R12 is no longer in production.
What should my gauges read on R134a?
It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges….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 are normal pressures for r1234yf?
1234yf PT Chart
| °F | °C | PSI |
|---|---|---|
| 60.8 | 16 | 111.75 |
| 64.4 | 18 | 118.55 |
| 68 | 20 | 125.63 |
| 71.6 | 22 | 132.98 |
Is R12 still manufactured?
International manufacturing of new R12 ceased in 1996, but existing R12 can still be reclaimed and purified. In the automotive world, the replacement for R12 was tetrafluoroethane, a hydrofluorocarbon (HFC) branded as R134a.
How do you know if your car AC is overcharged?
Signs & Symptoms of an Overcharged AC
- Inefficient Cooling. The most obvious sign of an overcharged AC system is poor cooling.
- Compressor Noise.
- High Pressure Readings.
- Struggling Engine.
- Broken Compressor.
What is the difference between R12 and R12 in a condenser?
The pressure and system capacity match R-12 in 40°F to 50°F evaporators, and the discharge pressure in hot condensers is only 5 to 10 psi higher than R- 12 (a benefit in automotive AC and warmer refrigeration environments). The temperature glide runs about 13°F in the evaporator.
What is R-12 refrigerant?
You see, R-12 is a CFC refrigerant and was one of the first artificially created refrigerants to see widespread usage. It was in the 1930’s that the DuPont corporation teamed up with General Motors to come up with a safe, reliable, and cheap refrigerant.
What is the ideal temperature range for R-12 blend?
The pressure and system capacity match R-12 when the blend is running in a 10°F to 20°F evaporator, and there is typically an 8°F temperature glide in the evaporator. Applications: direct expansion refrigeration and air conditioning systems designed for R-12 or R-500; good success in any size system, minor adjustment of controls needed.
What is the difference between R12 and r414b?
R-414B: A retrofit blend for R-12 refrigeration and air conditioning systems as well as automotive air conditioning systems. The pressure and system capacity match R-12 in 40°F to 50°F evaporators, and the discharge pressure in hot condensers is only 5 to 10 psi higher than R- 12 (a benefit in automotive AC and warmer refrigeration environments).