Unit installation
MAC 10
®
LEDC
4x4 Fan Filter Unit
12 Innovators in Clean Air Technology | www.envirco.com | Operation & Maintenance
Installation & Service Manual
■ Troubleshooting
Mode Choice:
Verify mode setting choice to DIP switch S1 (Control Mode), which is manual mode and then retry.
Motor Issues in Manual Mode:
(If you are in a network or analog mode, contact your controls contractor for troubleshooting assistance; if you continue to
need assistance, contact the factory.)
Unit is not adjustable:
Step 1. Verify that rotation of the manual speed potentiometer does not change the RPM. If rotating does nothing, remove
the electrical box cover, then remove the 4-pin motor connector from the control board and reinstall 180 degrees rotated.
Also insure that the 4-pin connection wires are pushed down securely onto connector pins. Again adjust the knob to verify
proper fan operation. Note: The 4 pin connector is on the 1/8” white cable from motor.
Low Air Velocity:
Step 1. Check to be sure that the manual speed potentiometer is set correctly.
Step 2. Check incoming power supply for proper voltage (120,208-240,277/24).
Step 3. Examine the HEPA lter.
High Air Velocity:
Step 1. Check to be sure that the air ow settings are correct.
Filter Issues:
Non-Laminar Flow and/or Excessive Contamination:
Step 1. Insure that no large obstructions are upstream of airow pattern.
Step 2. Determine that no other air-moving devices are operating in or around clean room which disrupt room’s
airow pattern.
Step 3. Check air velocity and if low, conduct the “Low Air Velocity” procedure outlined above.
If failure continues, contact Envirco Technical Support at 800-884-0002.
Net LED Status Denition
Green LED OFF Power Lost or No Communications
Green LED Flickering Network Data Trafc In Progress
Green LED ON A/B network wires are swapped
Red Network LED Green Status LED