cemco duct limit switches

The Firestat Duct 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.

CERTIFICATION

UL Approved

Meets requirements in Section 607.3.1. of the North Carolina Mechanical Building Code.

CUSTOM OPTIONS

Firestat thermostat switches are built to customer specifications. Custom options available, such as, temperature ranges, element lengths & fixed temperatures.

MADE IN THE U.S.A.

Senasys takes pride in quality control and reliable operation of our components. 

Every switch is individually 100% tested before it leaves the plant.



SAFETY

Safety is our priority. Firestats are a great addition to apartment complexes to ensure safety from hazardous situations in HVAC air ducts.

The Duct High Temperature Switches feature a helix bimetal element that senses rapid increases in duct temperature, such as those caused by fire. The high temperature limit operates an SPST switch that opens with a rise in temperature. A manual reset button reactivates the temperature limit after the high-temperature condition has cleared. These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems. 

These Firestat models are field adjustable with a temperature range of 100°-250°F with 5″, 7.5″ or 11″ bi-metal insertion element. Custom bi-metal element lengths, such as 3″, available as well. 

The Models TC-205 Duct High Temperature Limits are Fixed Temp with a 5″ insertion element.

The enclosure has an ambient temperature of -40°F to 190°F. And the element’s ambient temperature is 350°F.

PART NUMBER
DESCRIPTION
SETPOINT
ELEMENT LENGTH

TC1001A3C

Adjustable duct limit switch, 100°-250°F

125°

11″

TC1081A3C

Adjustable duct limit switch, 100°-250°F

125°

7.5″

TC1051A3C

Adjustable duct limit switch, 100°-250°F

125°

5″

TC2051A1253C18

Fixed Temperature Duct Limit Switch

125°F

5″

TC2051A1653C18

Fixed Temperature Duct Limit Switch

165°F

5″

TC2051A2003C18

Fixed Temperature Duct Limit Switch

200°F

5″

We decided to upload this table giving our customers the accessibility to a cross reference guide of our duct limit switches with other models including White Rodgers, Honeywell, and Johnson Controls. Our duct limit switches listed are comparative to a couple of the top competitors if not identical. Contact us for help, price and availability.

BRANDS
CEMCO
Honeywell
Johnson Controls

SERIES

TC

L4029E

A25AN-1

TEMPERATURE RANGE

100°F to 250°F

125°F to 240°F

25°F to 215°F

ENCLOSURE BOX DIMENSIONS

(WxDxH)

4 1/8″ x 2 3/4″

2-5/16″ x 2″ x 3-3/4″

4-2/5″ x 2-1/5″ x 1-4/5″

ELEMENT LENGTHS

5″, 7.5″ or 11″

3″

9 1/3″

ELECTRICAL RATINGS

9.8 Amps @ 115VAC / 4.9 Amps @ 230VAC

10 Amps @ 120VAC / 5 Amps @ 240VAC

16 Amps @ 120 / 277 VAC

SWITCH ACTION

SPST – Manual Reset

SPST – Manual Reset

SPST – Manual Reset

AGENCY LISTING

UL

cUL

UL

UL

cUL

At Senasys, price and lead time is quantity based and units are made to order. To get the best possible price and lead time we recommend sending in a request for quote with your estimated annual usage to our inside sales team for quantities greater than 100.
Duct Hight Limit Switch

ADJUSTABLE DUCT LIMIT CONTROL SWITCH

The TC Duct Limit Controls contain a Helix Bi-Metal that senses rapid increases in duct temperature such as fire. The Bi-Metal causes the normally closed contacts to open & turn off the power

Our adjustable option is available with a 5″, 7.5″ or 11″ insertion element.

PRODUCT SPECIFICATIONS

Setpoint Temperature Range: 100°F to 250°F

Reset: Manual Reset

Voltage: 120-240 VAC

Amp Rating: 4.9 FLA @ 240 VAC / 9.8 FLA @ 120 VAC / 29.4 LRA @ 240 VAC / 58.8 LRA @ 240 VAC

Temperature Sensor: Helix Bi-Metal

PURCHASE

View product to purchase online, or contact us for quantity based pricing.

FIXED DUCT LIMIT CONTROL SWITCH

The TC Duct Limit Controls contain a Helix Bi-Metal that senses rapid increases in duct temperature such as fire. The Bi-Metal causes the normally closed contacts to open & turn off the power

Our standard fixed temperature limit switch is available with a 5″ insertion element.

PRODUCT SPECIFICATIONS

Fixed Temperature Setpoints: 125°F, 165°F or 200°F

Reset: Manual Reset

Voltage: 120-240 VAC

Amp Rating: 4.9 FLA @ 240 VAC / 9.8 FLA @ 120 VAC / 29.4 LRA @ 240 VAC / 58.8 LRA @ 240 VAC

Temperature Sensor: Helix Bi-Metal

PURCHASE

View product to purchase online, or contact us for quantity based pricing.

Other custom temperature & element length options are available, please  contact us.

Fixed Duct Limit Controls

DUCT FAN & LIMIT SWITCH

Senasys is currently working on the R&D for other duct limit controls possibilities. Our current product offering for the TC Series only opens on temperature rise. We are looking at other possibilities such as close on temperature rise and a SPDT switch, which will open and close two sets of contacts on temperature rise.

As we finalize the product, we’ll update our current customers and make it available.

Stay in the know, submit your e-mail.

Testimonials

We are always looking for our customer’s feedback. If you’d like to leave us a review to be posted online, please email us at info@senasys.com.

Purchased one of these units for my furnace. It is a quality product and great customer service provided as well.

Tyler A.

Home Owner

We needed 11 duct controls for an inspection of an apartment building. Company was easy to work with and helped us find what we needed to pass the inspection.

Alex R.

Contractor

Do you sometimes have the feeling that you’re running into the same obstacles over and over again? Many of my conflicts have the same feel to them, like “Hey, I think I’ve been here before”

John Doe

Company Name

Distributors

Prefer to work with a distributor, visit our partners websites below to get started!