Greenheck Fan Outdoor Air Ventilator Manuel d'utilisateur télécharger pdf (Page 17)

TROUBLE SHOOTING

Blower Unit

Symptom Possible Cause Corrective Action

Blower fails Blown fuse or open circuit breaker Replace fuse or reset circuit breaker and

to operate check amps

Broken fan belt Replace

Defective motor or capacitor Replace

Motor starter overloaded Reset starter and check amps

Motor overamps CFMs too high Check CFMs and adjust drives if needed

Static pressures are higher or lower If higher, ductwork should be improved

than design 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 Unit 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

Dampers or registers closed. Open and adjust

Dirty or clogged filters Clean or replace

Leaks in ductwork. Repair

Elbows, or other obstructions

Correct or improve ductwork

may restrict fan outlet.

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 (SP) Induce SP into system ductwork.

(airflow resistance)

Excessive noise Wheel rubbing on housing Center wheel

or vibration

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” 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

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Greenheck Fan Outdoor Air Ventilator Manuel d'utilisateur Page 17

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