COOK HMD EN - Manual (Page 11)

11
Troubleshooting Insufficient airflow
No
No
No
No
No
No
Are the dampers not
fully open? This may
take several minutes.
Adjust dampers or replace damper/actuator as needed.
Reduce loss by improving ductwork.
Repair ductwork.
Replace / clean the filters as needed.
Are the system static
losses too high?
Is the blower speed too
low?
Are the filters dirty or
clogged?
Are there leaks in the
ductwork?
Is the belt slipping?
Yes
Yes
Yes
Yes
Yes
Yes
1. Replace or tighten as needed.
2. Install automatic belt tensioner if possible.
Adjust the drives as needed.
Consult factory.
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.