What does retard on gauges mean?
retard on a gauge pretty much means you are above the measured reading of the gauge and prevents the gauge from “spinning around in circles” (usually just bends the needle) when it is over rated.
Why is the low side pressure high?
The reason you have a high pressure side and a low pressure side at all is because the compressor increases the pressure and as it runs through your AC system to the condenser where it changes from a gas to a liquid and it will eventually lose pressure again as the cooling process takes place.
What makes the low side gauge the compound gauge?
The low side pressure gauge is called a compound gauge. That means it can be used to measure pressure or vacuum. The numbers around the outside of this gauge indicate pressure in pounds per square inch (PSIG), and the numbers near the bottom indicate vacuum in inches of mercury.
What do the numbers on the high and low side gauges mean?
Like the color of the hose, the gauges and control knobs will usually be colored to indicate high or low pressure. What are all the numbers on the high and low side gauge? The low side pressure gauge is called a compound gauge. That means it can be used to measure pressure or vacuum.
What does the Red side of the a / C gauge mean?
The red, high side gauge is used to measure the high pressure side of the a/c system. This gauge has no markings that indicate vacuum. It reads positive pressure only.
What should the pressure be on the low side of the AC?
The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. But if you see the AC low side high, high side low, such as the low side is 100 and the high side is 150, there might be problems with any of the inner components.
What should the pressure be on my air conditioner gauge?
You can begin testing with only 45 psi. You won’t get any cold air, but you should should start to see some compressor engagement. As soon as the compressor engages, it will cycle off rather quickly when the suction side of the compressor draws the pressure on the low side below 20 psi..