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Troubleshooting – COOK HMD EN User Manual

Page 10

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10

Troubleshooting

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Is the air volume too

high?

Adjust drive to

reduce rpm as

needed.

Adjust drive &

increase external

pressure. as needed.

To reverse the rotation on three phase units, disconnect and lock-out the

power, then interchange any two power leads.

To reverse the rotation on single phase units, disconnect and lock-out the

power, then rewire the motor per the motor manufacturer’s instructions.

Replace motor.

Compare the supplied voltage, hertz, and phase with the unit and

motor’s nameplate information. Correct as needed.

Is the static pressure

lower than rated?

Is the blower rotating in

the wrong direction? If

the blower is rotating in

the wrong direction, the

unit will move some air,

but will not perform as

designed.

Is the motor voltage

correct?

Is the motor horse

power too low?

Shorted winding on the

motor?

Consult factory.

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Motor overamps

Measure the unit’s air volume

(cfm) and compare it with its

rated air volume. If the measured

air volume is wrong, adjust the

fan’s RPM by changing/adjusting

the drive. The most accurate

way to measure the air volume

is by using a Pitot traverse

method downstream of the

blower. Changing the air volume

can significantly increase the

motor’s amps. If the air volume

is changed, the motor’s amps

must be checked to prevent

overloading the motor. To ensure

accuracy, the dampers are to be

open when measuring the air

volume.

Refer to the control panel parts list when troubleshooting.