Let’s take a look at the R134a pressure chart also know as Ac pressure chart. In this article, you will get to know how can you measure the AC pressure using the gauges. You can compare the value for your vehicle using the car ac pressure charts below.

R-134a TEMPERATURE PRESSURE CHART

(Tabla de Temperaturas y Lecturas)
Ambient

Temperature °F / °C


(Temperatura Ambiental)
Low-Pressure Gauge

(Puerto de Servicio del Lado

de Baja Presion)
High-Pressure Gauge

(Puerto de Servicio del Lado

de Lado de Alta Presion)
65°F (18°C)25-35 psi / 172-241 kPa135-155 psi / 931-1069 kPa
70°F (21°C)35-40 psi / 241-276 kPa145-160 psi / 1000-1103 kPa
75°F (24°C)35-40 psi / 241-310 kPa150-170 psi / 1034-1172 kPa
80°F (27°C)40-50 psi / 276-345 kPa175-210 psi / 1207-1448 kPa
85°F (29°C)45-55 psi / 310-379 kPa225-250 psi / 1551-1724 kPa
90°F (32°C)45-55 psi / 310-379 kPa250-270 psi / 1724-1862 kPa
95°F (35°C)50-55 psi / 345-379 kPa275-300 psi / 1896-2068 kPa
100°F (38°C)50-55 psi / 345-379 kPa315-325 psi / 2172-2241 kPa
105°F (41°C)50-55 psi / 345-379 kPa330-335 psi / 2275-2310 kPa
110°F (43°C)50-55 psi / 345-379 kPa340-345 psi / 2344-2379 kPa
Ambient temp is the outside atmospheric temperature.

How to Read an R134a low Side Pressure Chart

Car AC pressure chart
ac_check_average_readings

If you or your staff do not understand the gauges, you can not understand the air conditioning and R134a chart. You can learn to read the gauges with simple methods. First of all, you have to consider the following facts.

  • Ambient Temperature
  • Compressor Pressure

Ambient Temperature

Average air temperature or another environment near the equipment. Note In the process of measuring the ambient temperature, the measuring device (probe) should be shielded from drafts and heated by radiation.

In the case of Car AC, on a cold day when AC is turned off, pressure will be low. On a hot day, when AC is turned on, pressure will be high. You can see the demonstration of this concept in the image below.

Ac pressure chart

Before measuureing the Ac pressure using the gauge, you must know that what are the normal reading for the gauge.

Here are the details in this chart.

R134a pressure chart

According to the above chart, you can measure the ambient temperature. As the ambient temperature rises the red gauge also increases 40psi up to 225psi.


What is R-134A?

R134a refrigerant is a hydrofluorocarbon compound (NHS) with thermodynamic properties comparable to those of chlorofluorocarbon (Rl2.R134a refrigerant has zero ozone-depleting potential (ODP)) and is ubiquitous with the best refrigerant R12. R134a is the ideal refrigerant for working at high boiling and condensation conditions. R134a is a non-competitive refrigerant that has zero temperature “slip.” Always use polyester oil when working with R134a.

R134A REFRIGERANT CHARACTERISTICS

Refrigerant r134a (tetrafluorothane) is a odorless substance or color. It is considered the safest compound from the point of view of ecology, as it does not contain bromine and chlorine. Bromo-containing and chlorine-containing freons negatively affect the composition of the atmosphere, destroy the ozone layer. The second positive quality, which is due to the widespread use of this refrigerant – non-toxicity.

It was designed as a replacement for the r12 refrigerant.

The refrigerant r 134a is difficult to ignite, but can break down into toxic products when exposed to an open flame. The system should be completely airtight, because when the refrigerant and the air are connected, combustible mixtures are formed.

It is used in combination with polyester lubricant. Mixing freon r134a with other refrigerants is not recommended.

R-134A Refrigerant Pressure Temperature Chart

PSIGR-134A TemperaturePSIGR-134A Temperature
(10)-317472
(8)-277674
(6)-247875
(4)-218076
(2)-188277
0-158478
2-108681
4-58883
6-19082
839283
1079484
12109685
14139886
161610087
181910590
202211093
222511596
242712098
2630125100
2832130102
3035135105
3237140107
3439145109
3641150112
3843155114
4045160116
4247165118
4449170120
4651175121
4852180123
5054185125
5256190127
5658195129
5860200131
6062210134
6264220137
6465230141
6666240143
6868250147
7069260149
7271270152

Conclusion

R 134a pressure chart is essential to understand especially for a technician. In this article, you can learn the basic concept behind that and you can also learn how to read the ambient temperature using the gauges. You can compare your vehicle numbers with the charts in this article.

If you still have any questions regarding ac pressure chart, you can ask in the comment section and we will be more than happy to help you.

Leave a Comment