Duct Limit Switch Common Application

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In: Building Automation Systems, Company News, Helpful Information, HVAC

Senasys acquired the CEMCO TC duct limit switch product line in 2014. Many of our other switching products sense air or surface temperature making this product line fit well within our family! Since acquiring the product line we have made a number of improvements including technical support, more custom options and testing. For more information about the TC duct limit switches, read below. To purchase a duct limit switch or send a request for quote, please click here to contact our direct technical support team. Duct limit switches are used in HVAC systems to shut off heating, ventilation, and air conditioning equipment. They detect airRead More →

How to adjust a duct limit temperature switch

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In: Helpful Information

The TC duct limit temperature switch line manufactured by Senasys is an adjustable temperature switch that is a great solution for HVAC systems. Adjusting the switch is simple: Remove the cover Adjust the dial to the desired set point Replace the cover & Install (Click here for installation instructions) When the temperature switch leaves our facility it is factory set at 125°F, but has an adjustable temperature of 100°F to 250°F. For further details on how to adjustable a TC duct limit temperature switch, continue reading below. If you require further assistance, click here to contact our direct technical support team. Our adjustable TC switchesRead More →

Fan-and-Limit-Thermostat-Switch

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In: Helpful Information, HVAC

There are two main types of temperature switches used in HVAC systems, fan switches and limit switches. Senasys currently only manufactures a duct limit switch, and we are in the research and development phase for a duct fan and limit control. Our duct limit switch responds to a change in temperature, opens the circuit shutting down (limit) the equipment. For more information about our duct limit switch, click here. Click here to speak with our direct technical support. Duct Limit Switches Senasys duct limit switches are commonly found in HVAC air duct systems. When warm air is flowing through the air duct, the limit switch’sRead More →

Firestat Temperature Control Manual Reset

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When mounting a duct limit switch, it’s best if the bi-metal element reaches the middle of the air duct. The air in the middle of the duct is often a different temperature than the air towards the edge of the duct due to change in pressure and turbulence. When air turns or encounters resistance the air flow speed and temperature are affected. Click here to learn more. Senasys Duct Limit Switch Probe Options Senasys offers three different element lengths of our duct limit switches, and custom lengths are available: 5 inches 7.5 inches 11 inches To make it simple, the larger the air duct, theRead More →

HVAC Equipment

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In: Helpful Information, HVAC

Senasys manufacturers a large variety of temperature switches for HVAC systems: Bi-metal temperature switches Bulb and capillary thermostats Mechanical line voltage thermostats Switches found in HVAC systems are mechanical controls that are based on physics. More times than none, most HVAC systems have a requirement for these controls rather than an electronic type controller because failure modes are limited versus an electronic control. Rather than an electronic controller using inputs/outputs to communicate with the HVAC equipment, our temperature switches react to change in the environment causing the equipment mode to change as a reaction. For more information about the temperature switches Senasys offers to theRead More →

Duct High Limit Switches Control Exhaust Fans

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In: Building Automation Systems, HVAC

Many buildings require a high limit switch to prevent spread of fire or smoke. If the building uses an exhaust fan to maintain cooling, many building inspectors will require a limit control to be in place, such as the TC duct high limit switch. A duct high limit switch can sense temperature change up to 200°F. If a fire or smoke is present, to avoid the exhaust fan from spreading the fire and smoke throughout the building, the duct high limit switch senses the air temperature change to shut down the exhaust fan preventing spread of the fire and smoke. Continue reading below for moreRead More →

How to Install Firestat in HVAC System

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In: Helpful Information

Firestats are commonly installed in air duct systems to control the spread of fire and smoke when air temperature exceeds a pre-determined temperature. A simple control that is just as simple to install. Adjust the temperature dial to determined temperature (Click here for more information.) Install into the air duct system downstream of air flow. Wire the firestat to a fan For more information about installing a firestat in an air duct system, click the diagram below. How to Install Firestat in HVAC System The CEMCO TC Series Firestat is a push-button manual reset limit control designed for prevention of fire in warm air ducts.Read More →

TC Duct High Limit

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In: Building Automation Systems, Helpful Information

A duct limit control is commonly used in HVAC systems to detect air temperature inside a duct. Although, these temperature controls can also be found in grain dryers. The duct limit control functions the same in the grain dryer, but rather than sensing a building air duct temperature, the limit control senses a change in air temperature inside the dryer. When the grain blocks the air flow temperature, the duct limit control senses the temperature change shutting down the system. The operator must clear the blockage and manually reset the duct limit control to resume operation. Our duct limit control is available in two differentRead More →

Firestat Duct High Limit Cross Reference Part Index, Kele, Johnson Controls, 5D51-35, 5D51-90, 5D51-78, L4064, A25 Johnson Controls

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Duct Limit Switch Product Guide We decided to upload this table giving our customers the accessibility to a cross reference 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. Pricing listed is Retail, contact us for larger quantity pricing and availability. Duct limit switches are installed in air ducts to shut down heating, air conditioning and ventilation equipment when air temperature in duct exceeds a pre-set limit.  The high limit firestats have a temperature range of 100°F to 250°F with multiple element insertion lengths. We also offerRead More →

Duct Limit Switch Common Application

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In: Building Automation Systems, HVAC

Senasys TC duct limit control, or also known as firestat, is required among many states to be installed in large apartment complexes and commercial buildings. The firestat is a sensing device that shuts down airflow in the event of a critical temperature increase within an air duct. Senasys offers two different firestat options, fixed or adjustable; and multiple sensing element lengths are available (5″. 7.5″, 11″ or custom). For more information about the building code regulation and how the firestat functions, continue reading below. If you have a requirement for the firestat within a common shared HVAC systems, click here to send a request forRead More →