Floaire DIRECT FIRED MODULE Manuel d'utilisateur télécharger pdf (Page 22)

Troubleshooting

The following tables list causes and corrective actions for possible problems with direct fired heater units.

Review these lists prior to consulting manufacturer.

Airflow 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

Remote panel set to “Off” Position

Set Remote Panel to “Manual” or

“Auto” Position

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

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Floaire DIRECT FIRED MODULE Manuel d'utilisateur Page 22

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