Low Pressure Cutoff Switch Hvac

What ac pressure switch does.

Low pressure cutoff switch hvac.

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. Incorrect pressure can damage the compressor hoses and other a c system components. One of the big examples of this weird behavior is making the ac switch on and off over and over often in very quick succession. Again this is a symptom that should be easy to pick up if you are used to the way that your ac system operates.

The compressor is external and i did not notice until recently that the cut off switch was not opening on pressure drop and the compressor was running constantly. Use with hvac compressors to protect against loss of refrigerant or from excessive system pressure. The a c pressure switch is mounted on both the high and low sides of your a c. When the pressure is too low the compressor risks damage due to running with low oil.

Low refrigeration pressure switches the low pressure switch is typically an automatic reset switch that will reset itself when the pressure on the low pressure side of the refrigeration systems returns to normal or above the setting on the switch. This switch is crucial for proper a c performance. This is because most ac systems will automatically cut off for periods of time usually when the cabin temperature reaches what you have entered into the ac settings. When the pressure in your a c rises or lowers too much this switch turns off the compressor to protect it and the rest of the system from damage.

The switch is a texas instruments ps80 02 f1009 015 005. When it is too high the compressor is at risk of overheating and becoming damaged. Direct mount low pressure switches direct mount low pressure switches are designed with a snap acting sensor that opens on low pressure. One of my walk in boxes is controlled by a temp gauge that operates a solenoid to close the liquid line and drop the suction pressure to trip the low pressure cut off switch.

What you will notice with this symptom though is that this cut off will happen far. Universal mount single pressure controls. There are both high pressure and low pressure switches.