What ac pressure switch does.
High pressure cutout switch operation.
Condenser coils plugged up with dirt and debris.
Ac not blowing cold in this video we will explain what the a c pressure switch is for and how a bad faulty ac pressure switch m.
The high pressure cut out as shown in the diagram is of a simple construction.
In refrigeration system the high pressure cut off switch is a control device which is used as safety control.
When the high pressure gas enters the bellow the bellow expands and presses the spring.
A simple push of the switch will reset the switch and the operation of the air conditioner should return to normal until the pressure exceeds the rating of the switch.
The nut at the end of the spring is used to adjust the cut out pressure.
The pressure switch is set at an high pressure.
There is a high side pressure switch and low side pressure switch and they both serve to monitor the system for pressure faults that can damage the compressor.
Non condensables in the system can cause high head pressure.
It has a bellows that is set against a spring.
On some switches it says on off but the words auto off would be more correct.
The high pressure cutout switch on the other hand is a safety device only and does not have control of compressor operation under normal conditions.
If the pressure is too high it could burst the compressor causing a leak of refrigerant fluid.
Of course an over charge of refrigerant can cause the high pressure switch to open this is especially true with microchannel coils.
Moisture air mixed refrigerants.
Oil failure switch an oil failure switch is provided with high speed compressors.
Operation of a high pressure cut out.
This is necessary to prevent the possible damage of equipment.
So really you can look at the ac pressure switch as working in the same way as a fuse in an electrical circuit.
In the auto on position the pressure switch works as expected.
Things that can cause the high pressure switch to trip include.
When the pressure is too low the compressor risks damage due to running with low oil.
If the incorrect pressure is sensed the switch will open the a c compressor clutch circuit to prevent operation.
If there is no fluid in the system then it s going to grind to a halt again.
A heavy load in the occupied space adds more super heat to the coil and can cause high pressure readings.
Bad condenser fan motor.
When the pressure in discharge line raise above a certain limit of.
Once the necessary repairs are made to bring the pressure into specification the switch will allow normal clutch.
It monitors the pressure of the refrigerant on its respective side of the system.
The compressor is stopped by cutting the power supply of the motor of the compressor whenever the discharge pressure of the compressor becomes excessive.
