Low Pressure Cutout Switch Function

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.

Low pressure cutout switch function.

The exact cut out pressure needed to correctly cycle off the compressor may be different from unit to unit. An automotive air conditioner s pressure switch cycles the vehicle s compressor on and off when the refrigerant pressure falls below an acceptable level. When it is too high the compressor is at risk of overheating and becoming damaged. 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.

The electrical contacts are closed blue circle. One of the reasons for this is that the pressure drop from the evaporator to the compressor may be different on each unit. When the pressure is too low the compressor risks damage due to running with low oil. One on the low pressure side before the ac compressor and one on the high pressure side.

The settings for refrigeration pressure switches will vary depending on the type of refrigerant is used in the system. 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. Refrigerant does not wear out or evaporate. The spring wins and the membrane stays down.

This protects the compressor from damage. 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. 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. The low pressure cutout switch settings vary with the refrigerant used and the temperature application.

What ac pressure switch does. So you do often have two different ac refrigerant pressure switches on your car. 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. 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. A 5 in hg b 0 psig. Pressure switch with low air pressure pressure switch inner workings at low pressure. Only leaking air conditioning systems have low refrigerant levels.