Greenheck IDHB Installation, Operation And Maintenance Manual page 7

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.
DUCT W/ INTERNAL INSULATION
CORRECT
DUCT W/ EXTERNAL INSULATION
DUCT
DUCT
DUCT
INCORRECT
FIG. 10
AIR HANDLER
48" MIN.
HEATER
FIG. 7
Air Handler
HUMIDIFIER
48" MIN.
HEATER
FIG. 8
Humidifier
AIR FILTER
48" MIN.
HEATER
FIG. 9
Air Filter
Electric Duct Heaters
7