Heil 1184422 Main Limit Switch L170-20F

The Heil 1184422 is a main limit switch designed for residential and commercial HVAC furnace systems. This critical safety component monitors plenum temperature and prevents furnace overheating by automatically shutting off the system when temperatures exceed safe operating limits.

Key Features:

• L170-20F temperature control specification: opens at 170°F, closes at 150°F (20°F differential)
• Automatic reset function - no manual intervention required after cooling
• Bimetal disc design for reliable, long-lasting temperature sensing
• Direct OEM replacement for Heil, ICP, Tempstar, Arcoaire, Comfortmaker, and other compatible brands
• Manufactured in the United States to OEM specifications

This limit switch is essential for maintaining safe furnace operation by interrupting the electrical circuit when plenum temperatures become excessive. When the temperature drops back to 150°F, the switch automatically resets and allows normal operation to resume. The switch includes a mounting gasket for proper installation and sealing.

Cross-Reference Part Numbers: 315242, 338085-402, L/8, 1837, T-O-D60T11