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Photograph of a commercial air conditioning compressor charging gauge set (C) InspectAPedia.com R-32 Refrigerant Pressure Readings
R-32 pressures, quantities, high-side & low-side readings

R-32 refrigerant charge quantity for HVACR equipment.

This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate and correct lost or reduced air conditioner cooling capacity.

Definitions of Heating Ventilation Air Conditioning & Refrigeration (HVACR) "high side" & "low side" pressures; typical refrigerant pressures; effects of overcharged or under-charged refrigerant are found here as well.

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R32 Refrigerant Pressure / Temperature Chart

Following our summary table of R-32 referigerant pressures are complete R-32 refrigerant pressure/temperature charts as PDF files that you can download at no cost.

Measuring the refrigerant pressure in air conditioning, heat pump or other refrigerant systems can diagnose a range of operating problems including a refrigerant leak, over charging or under charging.

Refrigerant pressure readings measured at the air conditioning compressor/condenser unit and which are found to be too low on the high pressure side (compressor output) or on the low pressure side (compressor input or suction line) can indicate a problem with the compressor's ability to develop normal operating pressure ranges and thus will affect the cooling capacity of the air conditioning system.

Example R-32 Refrigerant Temperature vs Pressure Data
Ambient Temperature 1

Ambient
Gauge Pressure
psig / Bar

 R-32 Low Side Pressure2 R-32 High Side Pressure3
0°F (-18°C) 48.72 / 3.36 105 psi 450 psi
32°F (0°C) 103.21 / 7.12
68°F (20°C) 199.13 / 13.73
86°F (30 °C) 264.8 / 18.26
96.8°F (36°C) 310.89 / 21.44
107.6°F (42°C) 362.51 / 25
150.8°F (66°C) 634.81 / 43.78

Notes to the table above

Other Properties for R32 Refrigerant

  1. Ambient temperature around the compressor/condenser unit
  2. Assuming a suction side temperature of 2°C / 35.6°F
  3. Assuming a discharge temperature of 51°C / 123.5°F
  4. R32 has a low GWP of 675. I. R32 is a replacement for R310A and is a "low-flammability" refrigerant gas
  5. By 2025, high Global Warming Potential (GWP) refrigerants with a GWP of over 750, will be banned together with the systems using that gas
  6. R32 PRESSURE / TEMPERATURE CHART [PDF] Agas, Op. Cit., retrieved 2020/02/10 original source: https://www.agas.com/media/2427/r32-pt-chart.pdf

Refrigerant Pressures & Pressure Diagnosis

R-32 Refrigerant Pressure & Leak Correction

If you already know your refrigerant pressures are wrong or that you have a refrigerant leak, please see

If your air conditioning or heat pump system has lost its cooling capacity or won't start see

...

Continue reading at REFRIGERANT PRESSURE READINGS & CHARTS - home, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

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