Trouble Shooting

Symptom

Possible Cause

Corrective Action

 

 

 

 

Blown fuse or open circuit

Replace fuse or reset circuit breaker and check amps.

 

breaker.

 

Blower Fails to

Defective motor or capacitor.

Replace

 

 

Operate

Motor starter overloaded.

Reset starter and check amps.

 

Electrical.

Check for On/Off switches. Check for correct supply voltage.

 

Drive.

Check for broken or loose belts. Tighten loose pulleys.

 

 

 

 

Control power (24 Vac) wiring

Shorten wiring run to mechanical room or install a relay

 

run is too long (resistance

which will turn unit on/off (C/F for relay information).

 

should not exceed 0.75 ohms).

 

Motor Starters

Incoming supply power is

Need to increase supply power or use a special control

“Chatter” or Do

less than anticipated. Voltage

transformer which is sized for the actual supply power.

Not Pull In

supplied to starter coil must

 

 

 

 

be within +10% / -15% of

 

 

nominal voltage stated on

 

 

the coil.

 

 

 

 

 

Cfm too high.

Check cfm and adjust drives if needed.

 

Static pressures are higher or

If higher, ductwork should be improved.

 

lower than design.

If lower, fan rpm should be lower.

Motor Over Amps

Blower rotation is incorrect.

Check rotation and reverse if necessary.

 

 

 

Motor voltage incorrect.

Check motor nameplate versus 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.

 

 

 

 

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 rpm with catalog data.

 

Fan wheels are operating

For 3-phase see Fan Wheel Rotation on page 15.

Low Airflow (cfm)

backwards.

 

 

 

 

Dirty filter or energy wheel.

Follow cleaning procedures on pages 18 and 21.

 

Leaks in ductwork.

Repair.

 

Elbows or other obstructions

Correct or improve ductwork.

 

may be obstructing fan outlet.

 

 

Belt slippage.

Adjust belt tension.

 

 

 

 

Blower fan speed too high.

Check for correct fan rpm. Decrease fan speed if necessary.

High Airflow (cfm)

Filter(s) not in place.

Install filters.

Insufficient static pressure (Ps)

Induce Ps into system ductwork. Make sure grilles and

 

 

(airflow resistance).

access doors are installed. Decrease fan speed if necessary.

* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating.

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Greenheck Fan HRE-55, HRE-20, HRE-90, HRE-45 manual Trouble Shooting
Page 22 Page 24

HRE-55, HRE-45, HRE-90, HRE-20 specifications

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