Greenheck MSX (470658) - Manual (Page 28)

28 Modular Supply Make-Up Air Unit
®
Troubleshooting
Motor Overamps
Air volume too high?
Motor horsepower too low?
Motor voltage correct?
Blower rotation correct?
Actual static pressure
lower than design?
No
No
Yes
Yes
Yes
Yes
No
Yes
No
No
Shorted windings in motor?
Yes
Everything is working
properly, consult factory.
Yes
Adjust drives or increase external
static pressure as needed.
(Reference Blower Start-Up Step #5)
Resize motor.
Provide proper power supply.
(Reference Blower Start-Up Step #1)
Reverse blower rotation.
(Reference Blower Start-Up Step #2)
Adjust drives to reduce blower RPM.
(Reference Blower Start-Up Step #5)
Replace motor.