Description
The Advanced Distributor Products 76739900 is an L220F manual reset (M/R) flame rollout switch designed to protect residential and light commercial furnaces from the hazards of flame rollout. When abnormal combustion causes flames to escape the heat exchanger or burner box, this safety switch detects the elevated temperature and immediately interrupts the gas valve circuit, shutting down the burner to prevent equipment damage and potential fire hazards.
Product Overview
Flame rollout switches are a critical safety component in forced-air furnace systems. The L220F designation indicates this switch trips at 220°F, making it suitable for monitoring burner compartment temperatures in a wide range of gas furnace applications. As a manual reset device, the switch must be physically reset by a qualified technician after a trip event — ensuring that the root cause of the rollout condition is identified and corrected before the system is returned to service.
Key Features
- Manual reset design requires technician intervention after a trip event for added safety
- L220F rating — trips at 220°F to detect abnormal flame rollout conditions
- Interrupts the gas valve or control circuit upon activation to shut down burner operation
- Direct OEM replacement for compatible Advanced Distributor Products furnace models
- Compact, reliable bimetal disc design for consistent and repeatable performance
- Easy installation with standard spade terminal connections
Application
- Residential and light commercial gas furnaces
- Compatible with Advanced Distributor Products (ADP) furnace systems
- Mounts in the burner compartment or near the heat exchanger opening
Why Flame Rollout Switches Matter
Flame rollout can result from a cracked heat exchanger, blocked flue, insufficient combustion air, or a dirty burner. Without a functioning rollout switch, these conditions can lead to carbon monoxide intrusion, fire, or catastrophic equipment failure. Replacing a tripped or failed rollout switch with the correct OEM part — like the ADP 76739900 — ensures your furnace safety circuit operates as designed.
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