Floaire DMUA Instrukcja Użytkownika Pobierz pdf (Strona 22)

Troubleshooting

The following table lists causes and corrective actions for possible problems with the fan 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 inlet/outlet conditions

There should be a straight clear

duct at the inlet/outlet

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

Belt slippage

Adjust belt tension

Excessive Airflow

Blower speed to high

Reduce fan RPM

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 DMUA Instrukcja Użytkownika Strona 22

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