Testing your duct limit switchTesting your duct limit switch is a straightforward process that ensures your system is functioning properly in case of a fire. Firestat duct high limit units are designed to precisely monitor the temperature inside your duct system. In the event of high temperatures, the Firestat automatically shuts off the fan system to prevent fire from spreading. For further help testing your Firestat, contact us.

Testing your duct limit switch is a critical step to ensure the proper functioning of your system in case of a fire. Firestat duct high limit units are designed to accurately monitor the temperature inside your duct system. If high temperatures are detected, the Firestat automatically shuts off the fan system to prevent the fire from spreading.

Before shipment, our Firestats undergo rigorous testing to guarantee their reliability. Nevertheless, we strongly advise testing your duct limit switch at home for an extra layer of safety. Regular testing is especially important if you suspect that the unit may not be working properly or want to verify its performance over time.

How to test your Duct Limit Switch

1. *Connect the Firestat**: Begin by wiring the Firestat to your fan system.

2. **Set the desired temperature**: Adjust the Firestat to your preferred temperature limit.

3. **Raise the heat around the unit**: Gradually increase the heat around the probe to exceed the set temperature.

4. **Observe the fan system**: The fan should automatically shut off when the air temperature around the probe surpasses the set limit.

5. **Reset the Firestat**: After testing, pull back on the manual switch to reset the unit.

If the Firestat performs as expected during testing, it is ready for installation and use. Remember to regularly test your duct limit switch, especially before installation, to ensure it is working effectively.

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CEMCO Duct Limit Switches

The Firestat Duct Fan and Limit Thermostat Switches operate using the same physics to ensure HVAC safety. A helix bi-metal element senses a rapid temperature change. When the temperature changes the bi-metal expands and triggers a snap action switch and either opens or closes a circuit. These switches are commonly installed in air ducts designed to shut down heating, air conditioning and ventilation equipment in apartment complexes and other multiple dwelling units when air temperature exceeds the set point.

UL & cUL Approved
Made in the U.S.A.