Manual

INSTALLATION & OPERATION MANUAL

FFD, FFDR, FFDRA Models

Fan Filter Unit IOM

Installation & Operation

Troubleshooting

Low Air Velocity:

Step 1. Adjust variable speed control for higher blower output. For units eqquped with 3-speed, adjust switch setting from

“LOW” to “MEDIUM” to “HIGH”.

Step 2. Check prefilter media; replace or clean as necessary.

Step 3. Check incoming power supply for proper voltage (120,208-240,277/24).

Step 4. Examine the HEPA/ULPA filter.

High Air Velocity:

Step 1. Adjust variable speed control for lower blower output. For units eqquped with 3-speed, adjust switch setting from

“HIGH” to “MEDIUM” to “LOW”.

Filter Issues:

Non-Laminar Flow and/or Excessive Contamination:

Step 1. Insure that no large obstructions are upstream of airflow pattern.

Step 2. Determine that no other air-moving devices are operating in or around clean room which disrupt room’s

airflow pattern.

Step 3. Check air velocity and if low, conduct the “Low Air Velocity” procedure outlined above.

Step 4. Conduct smoke and photometer test on HEPA/ULPA filter. Seal or replace HEPA filter as necessary.