Standard Duct Heaters-Open Coil A job specification can be prepared by using the following information. Simply darken the applicable circles. Material which is part of the basic specification has already been darkened. Additional copies of this specification guide are available from your local INDEECO representative.
Duct heaters shall be INDEECO :
Type QUA Custom Slip-in Heater
Type QUZ Custom Flanged Heater
Approvals - Heaters and panelboards (if required) shall meet the requirements of the National Electrical Code and shall be listed by Underwriters Laboratories for zero clearance to combustible surfaces and for use with heat pumps and air conditioning equipment.
Heating elements shall be open coil, 80% nickel, 20% chromium, Grade A resistance wire. Type C alloys containing iron or other alloys are not acceptable. Coils shall be machine crimped into stainless steel terminals extending at least 1′′ into the airstream and all terminal hardware shall be stainless steel. Coils shall be supported by ceramic bushings staked into supporting brackets.
Heater frames and terminal boxes shall be corrosion resistant steel. Unless otherwise indicated, the terminal box shall be NEMA 1 construction and shall be provided with a hinged, latching cover and multiple concentric knockouts for field wiring.
All heaters shall be furnished with a disc type, automatic reset thermal cutout for primary over temperature protection. All heaters shall also be furnished with disc type, load-carrying manual reset thermal cutouts, factory wired in series with heater stages for secondary protection. Heat limiters or other fusible over temperature devices are not acceptable.
Heaters shall be rated for the voltage, phase and number of heating stages indicated in the schedule. All three-phase heaters shall have equal, balanced, three-phase stages. All internal wiring shall be stranded copper with 105°C insulation and shall be terminated in crimped connectors or box lugs.
Terminal blocks shall be provided for all field wiring and shall be sized for installation of 75°C copper wire rated in accordance with NEC requirements.
Heaters shall be furnished either with the Control Option specified in the schedule and described below or with the specific components listed in the schedule.
Please Click on Request Information Button, to select heater options.
250°F Open Coil Heaters Low temperature heaters, suitable for 250°F maximum outlet air at 900 SFPM minimum airflow, are available in both open coil and finned tubular constructions. Features :
The steel flange is omitted. The heater is attached to the oven or duct wall with sheet metal screws through the base of the terminal box.
Individually field replaceable open coil element.
The terminal box has 1′′ of insulation.
A galvanized steel channel frame is provided on three sides, with the element support brackets.
400°F Open Coil Heaters 400°F maximum outlet air temperature at 900 SFPM minimum airflow. Features :
Mounting flanges to mount heater.
Individually field replaceable open coil elements.
Terminal box has 1′′ of insulation.
Aluminized steel construction.
600°F Open Coil Heaters 600°F maximum outlet air temperature at 900 SFPM minimum airflow. Features :
Mounting flanges to mount heater.
Individually field replaceable open coil elements.
Terminal box has 1′′ of insulation.
Aluminized steel construction.
750°F Open Coil Heaters 750°F maximum outlet air temperature at 1200 SFPM minimum airflow. Features :
Mounting flanges to mount heater.
Individually field replaceable open coil elements.
Terminal box has 1′′ of insulation.
304 stainless steel construction.
1200°F Open Coil Heaters 1200°F maximum outlet air temperature at 1600 SFPM minimum airflow. Features :
Mounting flanges to mount heater.
Individually field replaceable open coil elements.
Founded in 1929 as a family owned and operated business, INDEECO designs and manufactures commercial and industrial electric heating and control systems. A staff of 250 skilled workers builds state of- the-art heaters and complex heating systems. Its 30-plus engineers, technicians, ASME-certified welders, quality assurance personnel, skilled electronic and electrical assemblers and panel board fabricators work together to provide customers with turnkey heating solutions. The creativity and spirit of discovery that launched INDEECO in an inventor’s basement during the Depression continues today in four air-conditioned plants totaling more than 190000 square feet. Since 1968, we have built electric heating equipment for the Railcar Industry.
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