Indeeco - Custom Duct Heaters
For more than 55 years, Indeeco has been supplying special heaters for use in air handling and air conditioning equipment. A wide range of special construction techniques has been developed to insure proper operation as well as easy installation, either in the OEM’s plant or in the field.
Air Conditioning & Air Handling Units
For more than 55 years, Indeeco has been supplying special heaters for use in air handling and air conditioning equipment. A wide range of special construction techniques has been developed to insure proper operation as well as easy installation, either in the OEM’s plant or in the field. These heaters typically fall into one of the categories described on the following pages.
Modular Construction
The heater is designed to match adjacent air handling unit components, such as fans, cooling sections, filter boxes, etc. Special construction is used so that the heater mounts adjacent to other components; the heater becomes simply one module of the air handling unit assembly. Unheated sections are provided where there is little or no airflow, such as the area blocked by an adjacent cooling coil header. Pressure plates can be provided to insure uniform airflow, when the heater must be installed adjacent to the fan. Buffer sections can be furnished to space the heating coils away from temperature sensitive components or to help assure uniform airflow.
Round Duct Construction
Indeeco manufactures UL listed open coil duct heaters specifically designed for installation to commercially rated round ducts. Heaters are available for installation to spiral single and double wall or snaplock round sheet metal ducts with inside diameters of 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 and 28 inches. Two square to round male galvanized steel transitions, are supplied for field installation to the inlet and outlet of the duct heater. The transitions are attached directly to the flanges of the heater and to the round duct using sheet metal screws. The Indeeco transitions have been approved by UL to provide uniform airflow across the open coil elements to avoid hot spots, which could affect the performance of the heater.
Railway and Subway Applications
Tough rail car industry standards have been developed to overcome the severe vibration, shock, high operating voltages, and voltage swings routinely encountered. For more than 35 years, Indeeco has built heaters to meet these standards, using heavy gauge corrosion resistant steel frames and oversized coil and terminal support bushings.
Multi-Zone or Dual Duct Heaters
These heaters are designed for installation inside multi-zone or dual duct air conditioning equipment, where the airflow is highly variable and unevenly distributed. These heaters use coils derated to approximately 25 watts per square inch (3.8 watts per square cm) of wire surface area (approximately one half normal watt density). Low density coils run cooler, and thus, provide longer life under these stringent operating conditions.
These heaters are supplied with fully proportional SCR control or with many heating stages to insure that no more heat is being supplied than is absolutely necessary. Each heater stage is spread over the entire face area to take advantage of all available airflow.
A perforated pressure plate is factory-installed on the air inlet side of the heater to make the airflow as uniform as possible. Linear limit thermal cutouts protect against serious overheating anywhere along the length of the heater.
When the heater must be installed entirely within the unit, only thermal cutouts are built into the heater, a remote panel is required for controls. When the terminal box can be external, heaters are available with a wide range of built-in controls.
Marine Duty
Only Indeeco offers a UL Listed duct heater which is also ABS Approved and meets U.S. Coast Guard Requirements for shipboard use.
Variable Air Volume (VAV) Units
To serve the fast moving and very competitive VAV market, Indeeco has developed a fully computerized design and construction system, which enables us to ship substantial volumes of heaters in a wide variety of sizes, ratings, and control options quickly. This system was patterned after our methods of designing and producing standard duct heaters, modified to solve the problems unique to the VAV industry. Slipand- drive sheet metal connections, control packages tailored to VAV systems, and special techniques for fan interlocks are some of the features designed for this market.
Duct Heaters for Wet, Dusty and Corrosive Areas
Indeeco offers a wide selection of custom built electric duct heater designs for outdoor, wet, dusty, and corrosive areas. Typical applications include use with roof top air handling equipment, in washdown areas such as food processing plants, wet and humid spaces near indoor swimming pools, and marine or casino boat applications including shipboard use.
Features:
- Disconnect switch with door interlock
- Manual reset thermal cutout
- Automatic reset thermal cutout
- Stainless steel frame
- Large diameter stainless steel finned tubular heating elements
- Heavy duty control transformer
- Fusing per NEC
- Airflow switch
- Stainless steel terminal hardware