Troubleshooting Guide cont....
10. Order the heater with the factory installed
linear temperature limit control if the heater
width is greater than 72 inches.
11. Never use aluminum conductors. Use copper
conductors only for all incoming wiring.
12. Never install a standard heater outdoors with-
out making special provisions to protect the
heater and control box from the elements.
13. Never bundle, tie or wrap power wiring. The
wire could overheat or the insulation could
breakdown.
14. Never use a different voltage and/or phase
than what is listed on the heater nameplate
label. The duct heater is to be used only at the
voltage and phase that is listed on the name-
plate label.
Note:
An airflow switch only proves that airflow exists
(a differential in static pressure), not that the
minimum air velocities and proper air distribution
for the duct heater exist.
FIG. 7
Air Handler
FIG. 8
Humidifier
FIG. 9
Air Filter
AIR HANDLER
HEATER
HEATER
HUMIDIFIER
AIR FILTER
HEATER
48" MIN.
48" MIN.
DUCT
DUCT
DUCT
48" MIN.
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
CORRECT
INCORRECT
CORRECT
INCORRECT
FIG. 10
FIG. 11
FIG. 12
INCORRECT
7
Electric Duct Heaters
