Different types of Refrigerants

A summary of the different types of refrigerants used in refrigeration and air conditioning systems, covering pressure, boiling point and application.

Here is a detailed description, divided into the following key topics:

1.Popular type of air conditioner

In the picture, a group of air conditioners by chemical type is identified, such as:

• HCFCs (e.g., R-22, R-123, R-141B): It is an old group that is being phased out because it destroys the ozone layer.

• HFC (also R-134a, R-410A, R-32, R-404A): It is a remedy developed not to damage the ozone layer but also to have a high global warming value (GWP).

• HC (Hydrocarbon, such as R-600a, R-290): It is a natural medicine. It is very environmentally friendly, but the precaution is combustible.

2. Pressure & Temperature Table

From the table in Figures 2, 3 and 4, there are 3 main parts to be known by the air mechanic:

• Standing Pressure (Stop Pressure): The pressure inside the system when the machine is not running, usually much higher than when the machine is running.

• Suction Pressure (Suction Side Pressure / Low Side): This is the value used by the mechanic to measure while filling the liquid or checking the air condition when the machine is working, such as:

• R-22: about 60-70 psi

• R-134a: about 12-15 psi (Popular use in car refrigerator / air conditioner)

• R-410A: about 120-130 psi (very high pressure)

• R-32: about 110-115 psi

• Discharge Pressure (Transmission / High Side Pressure): The pressure leaving the compressor to the hot coil

• Boiling Point (Boiling Point): Notice that the air conditioner will have a very negative boiling point, such as R-32 is at -52.0 ° C, which properties make it absorb heat from in the room excellently.

3. Cylinder Color Coding

Color identification allows the picking mechanic to use it correctly and safely (by AHRI standards):

• R-22: Light green

• R-134a: Light Blue

• R-410A: Pink (Rose)

• R-404A: Orange

• R-32: RED (Beware: with minor flammable properties)

• R-290 / R-600a: Red or Orange (Highly Flammable)

4. Replacements

From the last figure and some tables, it indicates which solution can represent which:

• R-410A or R-407C are often used as replacements for R-22 in new systems.

• R-134a used to replace R-12 (which has long since been discontinued)

Key precautions:

1. Do not Hellenize: Do not add different types of liquid in one system because it will reduce the efficiency and the compressor may break down.

2.Flammers: R-32, R-290 and R-600a groups require spark care in maintenance.

3.Instrumentation: Because the R-410A and R-32 have almost twice the higher pressure than the R-22, it requires a gauge and charging cable that specifically supports high pressure.

These data are very useful to technicians or people who want to check neatness in the installation or repair of refrigeration systems, sir.