How to Install A Firestat in your HVAC System

Firestat for HVAC

Installed in air ducts worldwide, Firestat duct controls shut down HVAC equipment when air temperature exceeds a pre-set limit. Firestat switches are indispensable in specialized HVAC applications and Building Automation Systems. These simple controls are just as simple to install. Keep reading for an easy guide on how to install a Firestat in your HVAC system.

How to Install a Firestat in HVAC System

You will need to install one or more Firestat in duct work located at criticalFirestat for HVAC temperature locations. For example, downstream from electric heaters or  points where duct work is in close proximity to flammable materials.

Firestats may be used in low voltage or line voltage circuits. They are often wired to be open circuit to both heat source and blower when duct air temperature exceeds the temperature setting. If more than one Firestat is connected to control a single heat source, the Firestat must be connected in series.

Steps for Easy Installation 
  1. First, adjust the temperature dial to your determined temperature. (Click here for more information.)
  2. Second, install the Firestat into the air duct system downstream of air flow.
  3. Finally, wire the Firestat to your fan.

View the wiring diagram for more help, click here.

Firestat Description 

The CEMCO TC Series Firestat is a push-button manual reset limit control designed for prevention of fire in warm air ducts. Firestats can be used with gas, oil, or electric forced warm air heating systems. Firestat controls come in a fixed temperature option of 125°F, 165°F or 200°F, and an adjustable temperature option with a range of 100°F to 250°F. The adjustable temp modelFirestat wiring diagram comes with either a 5″, 7.5″ or 11″ bi-metal element lengths. The fixed temp model has a 5″ bi-metal element length.

For more information on what temperature or bi-metal element length is best for your application, visit the below links.

For more information, contact us or purchase yours here today!


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