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

Improve ductwork to eliminate or

 

design

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

Refer to performance curve for fan

 

of the fan curve

 

 

Bearings need lubrication or

Lubricate or replace

 

replacement

 

 

Fan speed is too high

Reduce fan RPM

 

Belts too loose, worn or oily

Inspect and replace if needed

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Energy Tech Laboratories MR212 manual Airflow Troubleshooting Chart

MR212 specifications

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