FloAire Direct Expansion Coil Modules - Manual (Page 14)

14
Troubleshooting
The following table lists causes and corrective actions for possible problems with DX coil modules.
Review this list prior to consulting manufacturer.
Troubleshooting Chart
* Air velocity should be maintained between 200 and 550 FT per Minute through the coil.
Problem Potential Cause Corrective Action
Insufficient Cooling Frozen coil Reduce refrigerant charge.
Check for proper airflow across
coil.
Charge is low Add refrigerant charge.
Excessive air flow Slow blower RPM down.
Contaminated refrigerant Have refrigerant replaced.
Frozen coil Reduce refrigerant charge.
Insufficient Airflow
Coil sized too small * Increase airflow across coil.
Replace module with larger coil.
Overestimation of static pressure Reduce blower rpm.
Excessive Airflow
Coil sized too large * Change motor HP.
Slow blower RPM down.
Excessive airflow Slow blower RPM down.
Water in ductwork Drip pan full Check drip pan for obstructions.
Ductwork is not insulated Check drip pan plumbing for
clogs.
Insulate ductwork to reduce
condensation.