COOK HMD EN - Manual (Page 12)

12
Troubleshooting
Is the blower speed too
high?
Are the filters missing?
Is there insufficient
external pressure?
Yes
Yes
Yes
Adjust drive & decrease
external pressure. as needed.
Increase external static pressure.
Install filters.
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.
Consult factory.
Too much airflow
No
No
No
Refer to the control panel parts list when troubleshooting.