Installation manual

27
Table C-4: System and General Troubleshooting continued
Problem Possible Cause Remedy
Airflow blocked or dirty air fil-
ter.
Clean or replace air filter.
Supply air temperature
too hot.
Insufficient airflow.
Check all dampers. Open closed dampers including registers in
unused rooms. Check system temperature rise. If temperature
rise is too high, speed up blower fan.
Excess airflow.
Check system temperature rise. Slow down blower fan if neces-
sary.
Supply air temperature
too cool.
Excessive duct losses.
Check supply air ductwork. Seal leaky joints and seams. Insu-
late ductwork if necessary.
Supply air temperature
too cool during first mo-
ments of furnace cycle.
Excessive duct losses.
Check supply air ductwork. Seal leaky joints and seams. Insu-
late ductwork if necessary.
Air Filter Locations
P3LBX Models
P*HMX Models