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The high side, or discharge line, will be the line connected to the compressor from the bottom or lower position. It will not be wrapped in insulation and will be warm to the touch. This is where freon exits the compressor as a liquid.
How do you tell a high side from low side AC?
The suction or low side is always the larger tube going back to the compressor. The discharge tube or high side is the tube coming from the compressor to the condenser (radiator like device). It is much smaller in diameter than the suction tube. Low (suction)side is the larger of the two lines, high side is smaller.
What is high side and low side in HVAC?
High side and low side refer to the pressures in the two halves of the system. AC works by compressing refrigerant in the compressor (the beginning of the ‘high side’), cooling in the condensor it, and then expanding it to absorb heat (where it enters the low side).
Which is the high side and low side?
A semiconductor switch placed in the upper circuit with respect to an external load is referred to as high-side drive (power supply side), and when mounted in the lower circuit is called low side drive (ground side).
Does freon go in high or low?
The freon is added on the LOW PRESSURE SIDE ONLY. The hose tool you bought is made so you can only hook to the low side as the high side and low side fittings are different sizes and shapes for SAFETY’S SAKE.
Can you charge AC on high side?
@engineercyprus You can both use it to check the high side pressures, both static and running, and to charge refrigerant, but you’ll be able to charge refrigerant through the high side service port only with the compressor off, after vacuuming the system (if you don’t vacuum, refrigerant won’t get pulled inside).
Where is the high side service port AC?
Locate the high side port on the line that goes from the compressor to the condenser. The high side port will have a 16 mm quick-disconnect valve fitting with a red cap on vehicles with R134a, or a 3/8-inch threaded valve fitting on vehicles with R12. Mark Robinson is a freelance graphic designer and writer.
What is the low side of a refrigeration system?
The low side of a refrigeration system usually houses the evaporator, suction line, and any accessory components located within the suction line. Accessory components can include evaporator pressure regulator valves, suction filters and driers, crankcase pressure regulator valves, and suction accumulators.
What color is high side on AC?
Manufacturers color-code the hoses to distinguish between high pressure and low pressure. Low-side hoses are blue while the high side is red.
What should the high and low side pressures be?
These pressures will vary depending on ambient temperature (temperature of the outside atmosphere), but ideally, you will want to see your low side pressure between 30-40 psi and your high side pressure between 150-175 psi.
What is a high side output?
A high side driver is one in which the switching element is between Vcc and the load. A low side driver is one in which the switching element is between the load and common. A self-contained load such as a DC motor, solenoid/relay, light or LED string, can usually be driven by either method.
What is high side and low side mosfet?
“Low-side” means the current travels from the load or device through the mosfet to ground (common). “High-side” means the current travels from the supply through the mosfet to the load and then to ground.
Where is the low side port for AC?
The low side service valve is located in the line that runs from the compressor through the evaporator (firewall) and up to the condensor on the low pressure (suction) side of the system.
Why is my AC blowing hot air after recharge?
If the A/C works okay then gradually blows hot air after recharging, you might be dealing with refrigerant leaks. The safest and effective way to find leaks is to vacuum the system. Take your car to a qualified technician to have the system diagnosed.
What are the symptoms of an overcharged AC system?
Signs & Symptoms of an Overcharged AC Inefficient Cooling. The most obvious sign of an overcharged AC system is poor cooling. Compressor Noise. High Pressure Readings. Struggling Engine. Broken Compressor.
What happens if you put too much refrigerant in your car?
As a common side effect, excess freon gas can prevent the compressor from working at its capacity. In some cases, extra freon accumulates inside the compressor and results in subcooling or undercooling. In the worst of cases, the freon gas may even damage the internal mechanism of the compressor.
What happens if you put freon in the wrong port?
If you hook up to the wrong port the compressor can push refrigerant into the R134a canister under high enough pressure to cause it to burst. You always need to connect the canister to the LOW side. This way the compressor draws in the refrigerant. Refrigerant can spray out if the fitting is not connected properly.
Will freon leak without cap?
Schrader core valves that are inside these service ports can leak, even with a schrader valve cap. It’s not a guarantee you’ll see a leak for a couple of reasons. The refrigerant may have already leaked out.
What causes low side AC pressure too high?
In this situation, where the high-pressure side of the AC is too low, and the low side pressure is too high, the problem is probably compressor-related. It could also be related to the AC pressure switch, the expansion valve, the evaporator, or the dryer. There could also be a leak in the AC system.
