What are good pressures for r22?

Asked By: Montse Andergassen | Last Updated: 26th March, 2020
Category: home and garden indoor environmental quality
4.8/5 (6,342 Views . 20 Votes)
Example R-22 Refrigerant Temperature vs Pressure Data
Ambient Temperature in °F1 R22 Vapor Pressure at Sea Level R-22 Low Side Pressure2
95°F (35°C) 181.9 psig 68 psi
110°F (43.3°C) 226.4 psig
150°F (65.6°C) 381.7 psig

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Also asked, what should the high and low side pressures be?

The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Pressure that is too much lower or higher shows there is a problem. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI.

Likewise, what should my Pressures be for r22?

Example R-22 Refrigerant Temperature vs Pressure Data
Ambient Temperature in °F1 R22 Vapor Pressure at Sea Level R-22 Low Side Pressure2
32°F (0°C) 57.5 psig
70°F (21.1°C) 121.5 psig
95°F (35°C) 181.9 psig 68 psi

Also asked, what is the suction pressure of r22?

Pressure Variables For example, in a refrigeration unit, the refrigerant R-22 should operate at 75 psi on the suction side.

What should my AC gauges be reading?


10 50-100 20-30
20 100-150 20-30
30 150-200 25-35
40 180-225 25-35

29 Related Question Answers Found

What should the high and low side pressures be for 410a?

Manifold sets should be at 750 psi (high side) and 200 psi (low side), with a 500-psi low-side retard. Use hoses with a 750-psi service pressure rating. Leak detectors should be of the HFC type. R-410A is compatible with POE oils.

What should the high and low side pressure be in a r134a system?

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

Do you charge AC on high or low side?

The high side port should be on the line between the condenser and the expansion valve or orifice tube while the low side port will be on the return line between the evaporator (firewall) and compressor. The high side port is larger in size than the low side.

What should the gauges read on 134a?

For a low pressure gauge, a reading of 25 pounds per square inch (psi)to 40 psi is optimum. On the other hand, a high pressure gauge should read between 225 psi and 250 psi.

What is the superheat for r22?

For example, 68 psi suction pressure on a R-22 system converts to 40F. Let's say the suction line temperature is 50F. Subtracting the two numbers gives us 10F of superheat. Superheat for most systems should be approximately 10F measured at the evaporator; 20F to 25F near the compressor.

What is the condensing temperature of r22?

The influence of the evaporating temperature on the compressor energy input for R22 and the two alternative refrigerants at the condensing temperature of 50 o C is shown in Fig.

What is a pressure temperature chart?

PT charts show the relationship between pressure and temperature of given refrigerants. By changing the pressure of the refrigerant, the technician can set its temperature to a given level. Put the pressure temperature chart in front of you. Determine whether temperature or pressure is provided in the left column.

What is the temperature of freon?

As its name implies, refrigerant in the evaporator "evaporates". Upon entering the evaporator, the liquid refrigerant's temperature is between 40° and 50°F; and without changing its temperature; it absorbs heat as it changes state from a liquid to a vapor.

What is saturation in HVAC?

When we say “at saturation” or “saturated” in the HVAC/R trade we are generally referring to refrigerant that is in the process of changing from liquid to vapor (boiling) in the evaporator or vapor to liquid (condensing) in the condenser.

What is saturated temperature?

Saturation temperature means boiling point. The saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase. The liquid can be said to be saturated with thermal energy.

What is bubble point in HVAC?

The Bubble Point is where the first bubble of vapor appears in the liquid refrigerant during the change of state. Superheat takes place on the high pressure side, the Dew point refers to when the last drop of liquid evaporates and any temperature rise afterwards is called superheat. (

What is bubble psig?

For a suction (evaporating) pressure of 70 psig, the saturated liquid temperature is 34° and the saturated vapor temperature is 46°. The saturated liquid temperature of 34° is referred to as the bubble point temperature.

Can you use r134a gauges on r22?

R134A is typically used in automotive/small appliance applications. Assuming you are talking about a "room air conditioner", the correct up to date refrigerant is R410a. You can use any gauges you like to check the pressure of the system, with slight risk of cross contamination.

How do I put Freon in my air conditioner?

Before you add Freon to an AC unit, make sure to clean the air filter, blower wheel, and coils to ensure your unit is running smoothly. Then, put on some gloves and safety glasses to protect yourself from the Freon and turn off your AC. After it is off, hook up the refrigerant gauges to the valve connections.

How do you use AC gauges?

How to Use A/C Manifold Gauges
  1. Connect the low side hose (blue) to the low side port on the A/C unit.
  2. Connect the high side hose (red) to the high side port on the A/C unit.
  3. Open both valves so that the gauges register the A/C system pressure.

Can you use the same gauges for r22 and r410a?

No, you cannot. To make a short story long, R410A and R22 are refrigerants. They are both good refrigerants and they both work, but they have to be charged in the system at different pressures. R410A is a higher pressure system and R22 is a lower pressure system.