How To Read Ac Gauges

The blue gauge will tell you the low pressures while the red gauge will tell you the high pressures. As the system is engaged the gauge needle will move up and stabilize. With analog gauges the needle will swivel to reveal the pressure reading.
how to read ac gauges

Technicians can choose gauges with a digital or an analog reading.

How to read ac gauges. The table below shows the comparison between temperature and pressure for r134a. Reading the gauge the type of gauge set you use should match the refrigerant in the hvac unit. The blue gauge is for low pressure readings and the red is for high pressure readings. The high pressure gauge is label the same way as the compound low pressure gauge except we couldnt read inches of mercury in high pressure gauge.

Attach to the hoses and gauge set to the high and low side ports of your ac system. Analog gauges require the technician to mathematically convert the reading for a proper result. The gauges readings will depend on the ambient temperature. It reads from 0 to 500 psi and it scales is usually in 2 lb.

If it does not your readings will be incorrect. Start your ac pressure readings diagnostic by measuring the systems static pressure static pressure is the pressure with the system at rest compressor off for at least 30 mins. The needle on each gauge should be at rest on zero. This style has needles that swivel around to tell the level of pressure in the ac system.

With the ac turned off on a cold day the pressure will be low on a hot day the pressure will be high. Reading analog gauges the most common type of hvac gauge is simply the classic analog readout. This air conditioning gauges set measure pressure above the atmosphere pressure. Some gauges can read more than one refrigerant.