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Troubleshooting – Greenheck Fan Low-Profile Fan Coil LFC User Manual

Page 8

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8

Model LFC Low-Profile Fan Coil

®

Symptom

Possible Cause

Corrective Action

Blower fails to

operate

Blown fuse or open circuit breaker

Replace fuse or reset circuit breaker and check amps

Broken fan belt

Replace

Defective motor or capacitor

Replace

Motor starter overloaded

Reset starter and check amps

Motor overamps

Airflow too high

Check airflow and adjust drives if needed

Static pressures are higher or lower

than design

If higher, ductwork should be improved

If lower, fan RPMs should be lower

Blower rotation is incorrect

Check rotation and correct

Motor voltage incorrect

Check motor nameplate and supplied voltage

Motor horsepower too low

See specifications and catalog for fan curves to determine

if horsepower is sufficient

Shorted windings in motor

Replace motor

Insufficient airflow

Mixing box damper not fully open

Adjust damper linkage or replace damper motor

System static pressure too high

Improve ductwork to eliminate losses using good duct

practices

Blower speed too low

Check for correct drives and RPMs with catalog data

Mixing box dampers closed

Open and adjust

Dirty or clogged filters

Clean or replace

Leaks in ductwork

Repair

Elbows, or other obstructions may

restrict fan outlet

Correct or improve ductwork

Belt slippage

Adjust belt tension

Too much airflow

Blower fan speed too high

Check for correct fan RPM

Filter(s) not in place

Install filters

Insufficient static pressure

(airflow resistance)

Induce static pressure into system ductwork

Excessive noise

or vibration

Wheel rubbing on housing

Center wheel

Loose wheel on shaft

Tighten wheel setscrew

Loose motor or blower sheave

Tighten sheave setscrew

Belts too loose

Adjust belt tension after 24 hours of operation

Belts too tight

Loosen to maintain 3/8 inch deflection per ft. of span

between sheaves

Worn belt

Replace

Motor base or blower loose

Tighten mountings bolts

Worn bearings

Replace

Bearing and drive alignment

Realign

Motor out of balance

Replace

Wheel out of balance

Replace or rebalance

Sheaves eccentric or out-of-balance

Replace or rebalance

Accumulation of material on wheel

Clean wheel and housing

Troubleshooting