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General Information
IDHB and IDHC series are intended for installation
in accordance with electric heaters requirements
established by:
National Fire Protection Association
NFPA Standards 90A and 90B
NFPA Standard 70
"UL Listed (see complete marking on product)
ANSI/UL Standard 1996 (File E366239)
Installation
Failure to follow instructions will void all warranties.
For safe operation and best performance, the following
installation procedures must be adhered to.
Heaters may be installed in the sides of either horizontal
or vertical ducts but never in the top or bottom of a
horizontal duct. Heaters installed in vertical ducts are
tested and approved for up airflow only!
1. Install heater a minimum of (4) feet from heat
pumps or central air conditioners.
2. At least 4 feet downstream from an air
handler.
3. At least 2 feet either side of an elbow or turn.
4. At least 4 feet from any canvas duct
connector or transition section for change in
duct size.
5. At least 4 feet downstream from an air filter.
6. At least 4 feet upstream from a humidifier.
Refer to the back of this sheet for duct, electrical and air
velocity requirements.
To install a slip-in heater (FIG.1), cut an opening as
WRAPPER
required in the side of the duct. Slide heater in the duct
using the control box as template to mark the mounting
screw holes. Remove unit and drill mounting holes.
Mount unit to duct with sheet metal screws. Connect
high and low voltage supplies along with fan interlock
circuit (if no airflow switch is furnished). Larger heaters
may require hangers.
To install a flange type heater (FIG.2), insert heater
between two sections of flanged duct, and bolt in
place. For additional strength, the duct flange should
be doubled as shown in the figure. Large heaters may
require hanger straps. Connect high and low voltage
supplies along with fan interlock circuit (if no airflow
switch is furnished).
2
Electric Duct Heaters
SLIP-IN HEATER
HEATING
ELEMENTS
TERMINAL OR
CONTROL BOX
FIG. 1
The air duct should be installed in accordance with the
Standards of the National Fire Protection Agency for the
Installation of Air-Conditioning and Ventilating Systems
(Pamphlet No. 90A) and Warm-Air Heating and Air-
Conditioning Systems (Pamphlet No. 90B).
Do not "bank" heaters (side by side). If greater capacity
is required, proportion smaller heaters in separate
runouts.
Heater control boxes must be completely accessible
and located to provide ventilation at all times.
SLIP-IN HEATER
WRAPPER
TERMINAL OR
CONTROL BOX
FLANGE HEATER
DOUBLE
LIP
1"
1"
WRAPPER
TERMINAL OR
CONTROL BOX
HEATING
ELEMENTS
FIG. 1
HEATING
ELEMENTS
FIG. 2
DOUBL
LI
1"
1
WRAPPER
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