Low Pressure Cutout Switch Function

The ac pressure switch іѕ a ѕаfеtу ѕwіtсh thаt monitors the рrеѕѕurе оf thе refrigerant on the high and low pressure sides on your air conditioning system.

Low pressure cutout switch function.

The low pressure cutout switch settings vary with the refrigerant used and the temperature application. One of the reasons for this is that the pressure drop from the evaporator to the compressor may be different on each unit. Pressure switch with low air pressure pressure switch inner workings at low 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.

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. 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. 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.

The exact cut out pressure needed to correctly cycle off the compressor may be different from unit to unit. 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. Here s an easy way to correctly set the differential pressure. An automotive air conditioner s pressure switch cycles the vehicle s compressor on and off when the refrigerant pressure falls below an acceptable level.

This protects the compressor from damage. Refrigerant does not wear out or evaporate. When it is too high the compressor is at risk of overheating and becoming damaged. The spring wins and the membrane stays down.

So you do often have two different ac refrigerant pressure switches on your car. 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. 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.

The big spring is forcing the membrane green circle downwards red arrow while the air pressure tries to push it upwards yellow arrows. The settings for refrigeration pressure switches will vary depending on the type of refrigerant is used in the system. 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. When the pressure is too low the compressor risks damage due to running with low oil.