Ruud 42-102070-18 Furnace Pressure Switch Assembly

Product Description

The RUUD 42-102070-18 is a gas furnace pressure switch assembly rated at 0.55 inches water column (WC) with a single-pole single-throw (SPST) configuration and a single port inlet. Pressure switches monitor negative pressure generated by the inducer motor to verify proper venting before allowing the ignition sequence to proceed. If the required draft pressure is not achieved, the switch prevents the furnace from firing, protecting against unsafe combustion conditions. This assembly is an OEM-style replacement component installed by licensed HVAC technicians during routine service or system failure diagnosis.

This pressure switch assembly is designed for use in residential gas furnace applications where inducer-proven draft control is required. It is listed for use on the R96PA0852521MSA gas furnace. The SPST single-port design is suited for induced-draft furnace configurations where a single pressure tap is monitored to confirm adequate venting. Installation typically occurs during a no-heat call traced to a failed or out-of-calibration pressure switch.

Key Features

• Rated set point of 0.55 inches water column (WC) for reliable draft verification
• SPST electrical configuration for straightforward circuit integration
• Single-port inlet design compatible with standard inducer hose connections
• OEM-style replacement assembly for direct fit and function
• Compact form factor at 5.45 inches length and 3.05 inches width

Compatibility

Designed as an OEM-style replacement for the R96PA0852521MSA gas furnace as specified by the manufacturer.

Installation Notes

Installation should be performed by a qualified HVAC technician. Shut off power to the furnace at the disconnect and turn off the gas supply before beginning service. Disconnect the pressure hose and electrical leads from the existing switch before removing the assembly, and verify the replacement set-point rating matches the original switch before installation. Follow applicable local mechanical codes and the furnace manufacturer's service documentation throughout the repair.

Technical Specifications

• Switch Type: Pressure Switch Assembly
• Set Point: 0.55 inches WC
• Configuration: SPST Single Port
• Length: 5.45 inches
• Width: 3.05 inches
• Height: 2.05 inches
• Weight: 0.12 pounds

Standard Information

• Brand: RUUD
• Manufacturer Part Number: 42-102070-18