Lochinvar PRS30002 Pressure Switch Before D08 M9

Product Description

The Lochinvar PRS30002 is a pressure switch designed for use in Lochinvar commercial water heater and boiler systems. This switch monitors system pressure and provides a safety interlock function that prevents the unit from operating outside of acceptable pressure conditions. It is positioned in the pressure sensing circuit before the D08 and M9 stages of the system control sequence. Licensed plumbers, HVAC technicians, and commercial mechanical contractors typically service this component as part of a combustion safety or pressure-proving circuit replacement.

This pressure switch applies to Lochinvar PB and PF series commercial water heaters and boilers, specifically models rated in the 1501 to 2001 range as well as 502-series units. It is referenced under the assembly designation PB/PF1501-2001-M9 and is used in both PB and PF configurations across that product family. It is a direct OEM replacement intended for service calls involving pressure switch failure, nuisance tripping, or system lockout diagnostics.

Key Features

• Serves as a pressure-proving safety interlock before D08 and M9 control stages
• Compatible with both PB and PF series Lochinvar commercial units
• OEM part number ensures direct fit without field modification
• Applies across multiple capacity models from 502 to 2001 series

Compatibility

Compatible with the following Lochinvar models: PB 502, PF 502, PB 1501, PF 1501, PB 1701, PF 1701, PB 2001, and PF 2001. Assembly reference: PB/PF1501-2001-M9.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber familiar with commercial water heater and boiler pressure sensing circuits. Before servicing, shut down the unit, isolate gas supply, and relieve system pressure per the equipment service manual. Verify that replacement switch sensing range and port configuration match the original component before reconnecting control wiring.

Technical Specifications

• Application: Pressure switch before D08 and M9 control stages
• Series: PB/PF 502, 1501, 1701, 2001

Standard Information

• Brand: Lochinvar
• Manufacturer Part Number: PRS30002