Mars Low Pressure Switch 170/225 M43355

The Mars M43355 is a low pressure switch with settings of approximately 170 and 225 PSI.

Settings this high on a low pressure control indicate an application where the low side operates at elevated pressure, which occurs with high pressure refrigerants and in certain heat pump and transcritical applications.

It also illustrates a general point about interpreting control specifications: the terms high and low pressure describe which side of the system a control senses and which direction it acts, not the absolute magnitude of the pressure. A low pressure control on a high pressure refrigerant system may operate at pressures that would be a high pressure cut-out on an older system.

Confusing the two produces serious errors, and the safeguard is to identify a control by its action and its sensing connection rather than by its numbers.

A control that opens on falling pressure and senses the suction side is a low pressure control regardless of whether its setpoint is 10 PSI or 200 PSI.

Confirming the refrigerant, the application, and the intended function before selecting or setting any pressure control is what prevents the mismatch.

Applications include commercial refrigeration and air conditioning systems using high pressure refrigerants.

Brand

Mars

SKU

M43355

Category

Pressure Switches

Weight

0.2 lbs

Dimensions

3.50" x 2.00" x 1.50"

Price

$41.00

Availability

In stock

Rating

0 / 5.0