I/O MANUAL Horizontal/Modular/Vertical/Rooftop AHU 2015pg
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COMMERCIAL AIRE PRODUCTS 501 Terminal Road, Fort Worth TX 76106
Tel: 817-624-0820
Installing contractor must check for proper motor rotation and verify the bower motor amps are not
exceeding the name plate.
Control wiring must be wired in separate conduit from the power to avoid inductance problems and
must follow the local codes for low voltage wiring. The following table is a guide for control wiring size
and allowable distance:
20 AWG
200 FT
18 AWG
350 FT
16 AWG
500 FT
14 AWG
750 FT
12 AWG
1250 FT
Duct Heaters Installation
Our duct heaters may be used with heat pumps, cooling units or force air systems. They are suitable for
zero clearance installations in vertical or horizontal duct systems.
Duct Heaters Installation Guidelines:
1-
Install it at least 4 Ft. Downstream from air source or elbow. If closer than 4 Ft. may require
turning vanes, baffles or other devices to assure an even distribution of air over the heater.
2-
Install at least 2 Ft. before an elbow or may require devices as #1
3-
Transitions to and from a duct heater should be limited to 20% of the duct area per linear foot.
4-
Always mount in the side of a vertical or horizontal duct.
NEVER MOUNT FROM TOP OR
BOTTOM OF A HORIZONTAL DUCT.
5-
All duct materials must be suitable for 250 º F operation.
6-
The air duct should be installed in accordance with the standards of the NFPA for installation of
air conditioning and ventilating systems pamphlet No. 90A and 90B.
7-
Locate the heater so that it is completely accessible and normal ventilation is assured.
8-
The amount of air curtain between the heater elements and limit switches must not be reduced
by internal duct liner within 1 ft before or after the heater. In fiber glass duct systems, a metal
sleeve inside the duct to support the heater must be used. If the base of the heater is not flush
with the air stream, nuisance cycling may result.
9-
Field connected wires entering the heater controls compartment must be copper suitable for 75
º C ( 167 º F ) Field wire the supply and control circuits in accord with the National and Local
Codes and use the wiring diagram supply with each heater as a guide. The heater must not
operate unless the fan is on. Never use a fan delay with these heaters.
START UP LIST FOR DUCT HEATERS
1.) Electric duct heater must be installed according to manufacturer’s installation instruction manual and
must be in compliance with all NEC, local and state codes.
Failure to observe all of the installation guide lines will void the warranty and listing of the product.
2.) Review heater data information label found on outside of heater panel cover.
3.) Voltage, phase and frequency of heater must match heater data label. If field voltage and/or phase
does not match heater data label, do not operate heater.
4.) The proper field wire size to heater must be used, copper conductors only. See wire size data label
adjacent to heater terminal block or disconnect switch in heater. Heater must be properly ground to
accommodate NEC guide lines. Failure to do so may result in shock or death.
5.) Ensure all electrical connections are tight before energizing heater circuit. #10-14
