Low Pressure Cutout Switch Function

When the pressure is too low the compressor risks damage due to running with low oil.

Low pressure cutout switch function.

Refrigerant does not wear out or evaporate. For most hvac applications this setting for the pressure control should be just above the freezing point so that ice cannot be formed on the evaporator coil. For refrigeration low pressure switch settings a refrigerant pressure temperature chart should be used to determine the cut off for the low pressure side of the system. Only leaking air conditioning systems have low refrigerant levels.

The settings for refrigeration pressure switches will vary depending on the type of refrigerant is used in the system. 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. Here s an easy way to correctly set the differential pressure. Pressure switch with low air pressure pressure switch inner workings at low pressure.

So you do often have two different ac refrigerant pressure switches on your car. If the low pressure cutout switch for a particular application is set with a cut in pressure of 5 psig what would be the cutout pressure if thedifferential is 7 5 psig. On the square d pumptrol fsg2j21m4 switch the low pressure cut off auto start off operates at approximately 10 psig below the cut in and will turn off the pump. What ac pressure switch does.

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. For this switch only the company s instructions state the following form m4 only low water or loss of system pressure will cause the pump to be cut off. When it is too high the compressor is at risk of overheating and becoming damaged. One on the low pressure side before the ac compressor and one on the high pressure side.

Square d by schneider electric 9013fsg2j24m4 air pump pressure switch nema 1 40 60 psi pressure setting 20 65 psi cut out 15 30 psi adjustable differential low pressure cut off 4 6 out of 5 stars 210. One of the reasons for this is that the pressure drop from the evaporator to the compressor may be different on each unit. This protects the compressor from damage. The exact cut out pressure needed to correctly cycle off the compressor may be different from unit to unit.

The electrical contacts are closed blue circle. An automotive air conditioner s pressure switch cycles the vehicle s compressor on and off when the refrigerant pressure falls below an acceptable level. The spring wins and the membrane stays down. The big spring is forcing the membrane green circle downwards red arrow while the air pressure tries to push it upwards yellow arrows.