Allied Air 56W25 Furnace Limit Control Switch 3 Inch

Product Description

The ALLIED AIR 56W25 is a furnace limit control switch designed to protect heating systems from overtemperature conditions. This auto-reset limit switch monitors supply-air or heat-exchanger temperatures and interrupts the burner circuit when a high-limit threshold is reached, then automatically resets once temperatures return to a safe range. The 56W25 features a 3-inch insert depth, a yellow and white color designation, and an operating range of 220 to 250 degrees F. It is typically installed by licensed HVAC technicians during routine service or as a replacement component in gas furnace applications.

This limit control switch is suited for residential and light-commercial gas furnace installations where an auto-reset high-limit device is required. The 3-inch insert length positions the sensing element correctly within the plenum or heat exchanger cavity. The 220 to 250 degrees F range makes it appropriate for standard forced-air furnace configurations. Technicians replacing a failed or out-of-calibration limit switch will find the 56W25 a direct-fit option for compatible furnace platforms.

Key Features

• Auto-reset operation restores burner function automatically after an overtemperature event clears
• 220 to 250 degrees F operating range suited for standard gas furnace high-limit applications
• 3-inch insert depth for correct plenum or heat-exchanger placement
• Yellow and white color designation for quick field identification
• Lightweight at 0.25 pounds for easy single-technician handling

Compatibility

Designed as an OEM-style replacement limit control switch for residential and light-commercial gas furnace systems requiring a 3-inch insert, auto-reset, 220 to 250 degrees F high-limit device.

Installation Notes

A licensed HVAC technician should install this limit switch. Disconnect all power to the furnace and shut off the gas supply before removing the existing limit control. A nut driver or open-end wrench is typically required to secure the switch to the plenum panel. Verify that the replacement switch insert depth and temperature rating match the original equipment specification before restoring power and gas.

Technical Specifications

• Type: Limit Control Switch
• Insert Depth: 3 inches
• Operating Range: 220 to 250 degrees F
• Reset Type: Auto Reset
• Color Designation: Yellow and White
• Weight: 0.25 pounds
• Used On: Furnace

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 56W25