Westinghouse 626404R Furnace Control Limit Switch

Product Description

The WESTINGHOUSE 626404R is a double-pole control limit switch designed for furnace applications. It monitors internal furnace temperatures and interrupts the control circuit when a set threshold is reached, protecting the heat exchanger and connected components from overtemperature damage. The switch trips at 145 degrees F, making it suitable for use in systems where that specific cutout point is required. Installation is typically performed by a licensed HVAC technician as part of routine service, control system repair, or safety-device replacement.

This control limit switch is used in furnace systems requiring a 2-pole, normally closed safety device that opens on temperature rise. It fits into the broader control circuit to prevent unsafe operating conditions during heating cycles. The double-pole configuration interrupts both legs of the circuit simultaneously, which is appropriate for certain furnace control board and blower control configurations. Refer to the original equipment documentation to confirm the correct trip temperature and pole configuration before installation.

Key Features

• 145 degrees F trip point for furnace overtemperature protection
• Double-pole (2-pole) design interrupts both circuit legs simultaneously
• Functions as a control limit switch to protect heat exchangers and downstream components
• OEM-style replacement format for straightforward service swap

Compatibility

Designed as an OEM-style replacement control limit switch for residential gas furnace systems requiring a 145 degrees F double-pole limit device.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect all power to the furnace at the disconnect switch and confirm the circuit is de-energized before removing the existing limit switch. Follow the equipment manufacturer wiring diagram when connecting the replacement device. Refer to local mechanical and electrical codes, including NEC guidelines, for any applicable requirements governing furnace control wiring.

Technical Specifications

• Type: Control Limit Switch
• Poles: 2-Pole (Double Pole)
• Trip Temperature: 145 degrees F
• Used On: Furnace

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626404R