28
®
Model MSX Make-Up Air
Insufficient Airflow
Troubleshooting
Damper(s) not fully opened?
Adjust damper linkage(s), or replace faulty actuator(s).
(Damper actuators may take a few minutes to open)
Filters dirty or clogged
Clean or replace filters.
(Reference Filter Maintenance in the Maintenance section).
Blower speed too low?
Adjust drives as needed.
(Reference Blower Start-Up Step #5)
System static losses too high?
Reduce losses by improving ductwork.
Yes
Yes
Yes
Yes
No
No
No
No
No
Leaks in ductwork
Repair leaks.
Yes
Belt slipping
Replace or tighten belt.
(Reference V-Belt Maintenance in the Maintenance section)
Yes
Everything is working properly,
consult factory.
Yes
Too Much Airflow
Blower speed too high?
Adjust drives as needed.
(Reference Blower Start-Up Step #5)
Insufficient external static
pressure?
Increase external static pressure.
Filters not in place?
Install filters.
Yes
Yes
Yes
No
No
Everything is working properly,
consult factory.
No
