250° Construction Process Air Heater
Low temperature heaters, suitable for 250° F maximum outlet air, are available in both open coil and finned tubular constructions.
Standard Features
Low temperature heaters, suitable for 250° F maximum outlet air, are available in both open coil and finned tubular constructions. They are identical to the open coil and finned tubular heaters except for the following 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 replaceable finned tubular elements are flange mounted.
The terminal box has 1″ of insulation.
A galvanized steel channel frame is provided on three sides, with the element support brackets pop riveted to the frame.
Special Features
Built-in Controls
(Available for heaters operating up to 150° F outlet air temperature.)
Built-in contactors, fuses, control transformers, and disconnect switches save installation labor and provide single source responsibility for the heater-control package.
Built-in Thermostat
(Available for heaters operating up to 150° F outlet air temperature.)
For automatic control of outlet air temperature. Adjustable over a range of 60-250° F. Outlet temperature will be lower than set point as the thermostat senses heat from elements as well as outlet air. Do not use where outlet air temperature will exceed 150° F. May also be used as an automatic high temperature thermal cutout.
Built-in Combination Thermostat/Thermal Cutout
(Available for heaters operating up to 150° F outlet air temperature.)
Control normally cycles the heater on and off, but shuts the heater down until reset button is pressed if temperature rise is more than 50° F above the control set point. (60-250° F range).
Remote Mounted Thermostats
For air temperature control or high temperature thermal cutout protection, a bulb and capillary type thermostat can be mounted in a cool location up to 8′ away from the heater. A well is provided to mount the thermostat bulb into the airstream.
Built-in Thermocouple
Built-in sheathed thermocouple available for high temperature limit. This can be mounted in the airstream or clamped to a tubular/finned tubular element to prevent overheating.
Built-in Airflow Switch
(Available for heaters operating up to 150° F outlet air temperature.)
A diaphragm-operated differential pressure switch normally prevents the heater from operating unless the air is flowing. It senses pressure between process air and the terminal housing.
Moisture-Resistant Element Seal
RTV or epoxy seals are inserted into each end of tubular or finned tubular elements. Recommended when heater may be stored in high humidity or where terminals are exposed to high humidity during operation.
Flanged Duct Mounting
For attaching heater to external duct flanges. No internal support required. Note that heater face dimensions W and H match the inside dimensions of the duct. While integral flange design is standard on the 250° F Construction, other heaters can be supplied with separate flange mounted plenum sections where required.
Flanged Terminal Box
A 1″ full flange at end of terminal box is available for mounting heater. Especially useful when heater is mounted inside
Isolated Junction Box
Power connections are housed in a separate isolated junction box, factory connected to heating element terminals. Used where field wiring is not suitable for high ambient temperatures.
Dust-Tight Terminal Box
For dirty environments. Boxes are welded, stainless steel with hinged, latched cover and Scru-tite hubs for incoming power. Insulation under the mounting flange is required for all heaters operating above 250° F outlet air.
Special Materials
Nonstandard fin, sheath and frame materials available for special applications. Finned tubular elements available with Monel sheath and fins. Tubular elements available in Monel, 304 and 316 stainless steel and Inconel sheath. Stainless steel frames available for all constructions.
Nonstandard Circuiting
Additional circuits available on standard heaters. However, number of circuits must be consistent with number of elements in tubular and finned tubular constructions. Number of circuits shown in standard listings can also be reduced for high amperage SCR control.
Insulation Under Mounting Flange
Insulation is furnished under mounting flange to save energy and reduce terminal housing temperatures. This is standard on 1200° F Construction and optional on all others.
Special Wattage, Voltage and Dimensions
Indeeco specializes in custom designed process air heaters.
Voltages up to 600V are available in single or three phase. dimensions. Specify steel or stainless steel angle iron. an oven, where ready access to electrical connections and minimum terminal box size are desirable. No terminal box cover is supplied.
Applications
Indeeco Process Air Heaters are installed in plenums, ducts or pipes to heat forced air in industrial equipment and systems. A wide variety of heater designs and sizes are available to provide outlet air temperatures up to 1200° F. The air can be either recirculated or fresh. Recirculated air is used to reduce power consumption and heater size. Fresh air is used when ventilation of the process is necessary.
Process air heaters are installed in ovens, furnaces, autoclaves, dryers, conveyor systems, pressure vessels, and other equipment to supply the precise amount of clean heat for:
Aircraft Manufacturing
Air Curtains
Air Drying
Annealing
Booster Heating
Baking
Batch Heating
Chemical Processing
Cooking
Core Drying
Cryogenic Exhaust Gas Heating
Curing
Dehumidification
Dehydrating
Drying
Exhaust Gas Heating
Film Drying
Finishing Systems
Food Processing
Fruit Ripening
Heat Recovery Supplement
Heat Treating
Hopper Heating
Ink Drying
Laboratory Testing
Make-up Air Heating
Metal Finishing
Motor Winding Burnoff
Paint Baking/Drying
Pharmaceutical Manufacturing
Plastic Curing
Preheating
Reheating
Roasting (nut, coffee, corn, etc.)
Semi-Conductor Manufacturing
Sterilizing
Standby Heating
Textile Drying
Varnish Drying
Wire Manufacturing
