FloAire STAGED ELECTRIC HEAT MODULE - Manual (Page 19)

19
Troubleshooting
The following table lists causes and corrective actions for possible problems with electric heater units.
Review this list prior to consulting manufacturer.
Troubleshooting Chart
Problem Potential Cause Corrective Action
Fan Inoperative Blown fuse or open circuit breaker Replace fuse or reset circuit breaker
and check amps
Disconnect switch in “Off” position Turn to “On” position
Motor wired incorrectly Check motor wiring to wiring diagram
located on fan motor
Broken fan belt Replace belt
Motor starter overloaded Reset starter and check amps
Motor Overload Fan rotating in the wrong direction Be sure fan is rotating in the direction
shown on rotation label
Fan speed is too high Reduce fan RPM
Motor wired incorrectly Check motor wiring to wiring diagram
located on fan motor
Overload in starter set too low Set overload to motor FLA value
Motor HP too low Determine if HP is sufficient for job
Duct static pressure lower than design Reduce fan RPM
Insufficient Airflow Fan rotating in the wrong direction Be sure fan is rotating in the direction
shown on rotation label
Poor outlet conditions There should be a straight clear duct
at the outlet
Intake damper not fully open Inspect damper linkage and replace
damper motor if needed
Duct static pressure higher than
design Improve ductwork to eliminate or
reduce duct losses
Blower speed too low Increase fan RPM. Do not overload
motor
Supply grills or registers closed Open and adjust
Dirty or clogged filters Clean and/or replace
Belt slippage Adjust belt tension
Excessive Airflow Blower speed to high Reduce fan RPM
Filters not installed Install filters
Duct static pressure lower than design Reduce fan RPM
Excessive Vibration and Noise Misaligned pulleys Align pulleys
Damaged or unbalanced wheel Replace wheel
Fan is operating in the unstable region
of the fan curve Refer to performance curve for fan
Bearings need lubrication or
replacement Lubricate or replace
Fan speed is too high Reduce fan RPM
Belts too loose, worn or oily Inspect and replace if needed
Insufficient Heat Blown fuses Inspect and replace if needed
Thermostat setting too low Increase thermostat setting
Excessive airflow Reduce fan RPM
Insufficient coil power Check incoming voltage and
amperage with all coil stages on and
compare to nameplate values
No Heat Blown fuses Inspect and replace if needed
Airflow switch not energized Increase fan RPM (Sensing tube
should be curved toward air flow)
Hi-limit activation Insufficient airflow. Increase fan
RPM.
Improper coil wiring Inspect coil power wiring