I/O MANUAL Horizontal/Modular/Vertical/Rooftop AHU 2015pg
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15
COMMERCIAL AIRE PRODUCTS 501 Terminal Road, Fort Worth TX 76106
Tel: 817-624-0820
To convert to CFM multiply the answer by the Sq. Ft. of the heater minimum duct area
design. In the example 800 multiply by .888 would be 710 CFM.
These minimum air flow requirements should be met at any point over the face of the heater. If heaters
are used in ducts larger than the heater minimum duct design, reliable means should be used to assure
the proper air flow through the heater.
ELECTRIC DUCT HEATER MAINTENANCE GUIDE LINES
In most cases electric duct heaters require very little maintenance or service during the life of the
product. The duct heater must be installed according to our installation instruction manual and NEC /
SMACNA guide lines.
1) Disconnect ALL power circuit(s) to heater before any service is to be performed, there may be more
than one disconnect switch that needs to be in the off position.
2) All electrical connections to the heater power & control circuits should be tight. Inspect all electrical
connections in heater, as they may become loose during operation. All wiring must be done in
accordance with the National Electrical Codes and any applicable state & local codes.
3) All air filters in duct or unit system should be checked to ensure clean air is present with no restriction
of air flow to heating elements. Always replace the filter with the same type as originally furnished.
4) Check the field voltage and phase rating is the same as the heater information data. Check full line
amp draw of heater against rated heater data plate/label. Correct field wire size and grade must be used
to heater power circuit(s). Heater must have proper grounded wire to heater.
5) Heater should be free and clean of dust /dirt and moisture in heater control panel.
6) Heater construction or wiring must not be modified or any alterations are preformed to change the
heater construction. This would void the listing and warranty of the heater.
