Armstrong 78L29 Furnace Fan and Limit Control Rollout Switch

Armstrong 78L29 Furnace Fan and Limit Control Rollout Switch is a reliable safety component for residential heating systems. As a Rollout Switch, it helps protect your furnace by interrupting operation when the limit is exceeded, ensuring safe, efficient performance.

Featuring a 250°F temperature rating, this rollout switch activates to prevent overheating and protects both the blower and limit control circuits. The blue label included helps service technicians quickly identify the correct replacement part, reducing downtime. Its rugged construction and proven reliability reduce nuisance outages and help maintain furnace efficiency over time.

Designed for use as a replacement or service upgrade, the Armstrong 78L29 integrates smoothly with standard furnace fan and limit controls, supporting reliable ignition sequencing and safe operation. It is a trusted choice for HVAC pros restoring performance and extending equipment life. Compatible with a range of Armstrong systems and other standard furnace configurations, this part simplifies replacements.

• Type: Rollout Switch
• Application: Used On Furnace
• Rating: 250°F trip temperature
• Label: Blue label included
• Durability: Durable safety component for HVAC systems