Description
The Armstrong Furnace R110070005 is an OEM replacement L145-40F high-limit switch engineered to protect your furnace from overheating conditions. When supply air temperatures exceed the rated set point, this limit switch interrupts the burner circuit, shutting down heat production and preventing heat exchanger damage, component failure, or fire hazard. Once temperatures fall back within the safe operating range, the switch automatically resets to restore normal furnace operation.
Product Overview
Designed as a direct OEM replacement for compatible Armstrong Furnace systems, the R110070005 limit switch delivers dependable, repeatable performance in residential and light-commercial heating applications. The L145-40F designation reflects the switch’s operating characteristics: it opens at 145°F and closes with a 40°F differential, resetting at approximately 105°F.
Key Features
- OEM replacement part for Armstrong Furnace systems
- L145-40F designation: opens at 145°F, 40°F differential (closes at ~105°F)
- Automatically resets when temperature returns to safe range
- Interrupts burner circuit on high-temperature fault to protect heat exchanger
- Helps prevent equipment damage, nuisance shutdowns, and safety hazards
- Direct drop-in replacement for simplified installation
Application
- Compatible with Armstrong Furnace models requiring the R110070005 limit switch
- Suitable for residential and light-commercial forced-air furnace systems
- Ideal for service technicians performing furnace maintenance or safety control replacement
Specifications
- Part Number: R110070005
- Switch Type: High-Limit (L145-40F)
- Opens At: 145°F
- Differential: 40°F
- Closes At: ~105°F
- Brand: Armstrong Furnace
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