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ELECTRIC DUCT HEATERS |
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ELECTRIC DUCT HEATERS We can supply a variety of Duct Heaters and Elements
OVERVIEW Airflo Electric Duct Heaters are self-contained heating units designed for installation in air handling systems. Some heaters are an integral part of other equipment, some for direct attachment to other equipment such as heat pumps and fans, while others are for use as complete heating units to be mounted in air ducts. These heaters provide precision heating by handling required heating load demands. Multiple locations within a single building allow maximum potential individual control of each zone. They can be used as primary heat, preheat, re and supplemental heat or auxiliary heat. DEFINITIONS Primary heat is the heat source for the entire building. Preheat is used to temper air where it enters the building and prior to another air conditioning source. Reheat is used to raise the air temperature of air previously conditioned by another process before distribution to the zone. Supplemental or auxiliary heat is used to temporarily boost the heating capacity of another piece of equipment such as a heat pump. DESIGN Airflo Electric Duct Heaters are designed with “Thermofin” tubular finned electrical resistance elements manufactured by B J Cocksedge Ltd, arranged in the most advantageous pattern for heat transfer to the air stream. DESCRIPTION Airflo Electric Duct Heaters offers high quality design and manufacturing. Our large selection of tubular elements and in house manufacture enables us to provide quick delivery. APPLICATION
Heat Treating Forced Air Comfort Heating Booster Air Heater Re-Heating Air Drying/Curing Operations Annealing Core Drying Resistor Load Banks
Complete Airflo Electric Duct Heaters, incorporating the Thermofin range of elements from B J Cocksedge, are designed and manufactured by Airflow Engineering (SI) Ltd, at our premises, to meet the requirements of individual air conditioning installations. Heaters are designed according to air speed, duct size and kW’s required.
Duct Heaters may be bolted to the ductwork through the side, bottom or top. Duct Heaters may be mounted in tandem to increase the kWs that can be installed.
Once we have been provided with full details of the job, the most economic arrangement of elements, banks etc. will be selected to comply with requirements.
Our quotation and configuration are then forwarded for verification by the customer. Stocks of elements, terminal boxes, controls etc., are maintained so that heater banks can be built up with a minimum of delay ready for insertion into duct work.
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INFORMATION REQUIRED TO DESIGN AND MANUFACTURE A AIRFLO ELECTRIC DUCT HEATER
1. Size of duct and entry side for bank 2. Total kilowatts required 3. Number of control steps needed and whether wiring is single or 3 phase. 4. If you want the elements fully or pre-wired. 5. Airflow rate nominated. 6. Details of controls required to be fitted to banks, or supplied separately.
All standard duct heats have an over-temperature cut out attached to one element to sense element temperature. Additional protection for the heat from low air flow can be achieved by installing an air flow or pressure switch on the inlet side.
The design and construction of Airflo Electric Duct Heaters comply with the requirements of the relevant Australian standards. (For the construction and compliance of the unit, the standard AS 3102).
RECOMMENDATION The following is recommended to ensure that there is no electrical interference when duct heaters are switched: · Where the total element rating exceeds 6kW the load should be balanced over 3 phases. · Where the element rating exceeds 6kW per phase, the load should be connected in stages so that a delay of 20 seconds will occur between the connections of each stage of element loading.
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