FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
Filter/Motor Indicator LED (ML/FL) – RSR
Sample line string below:
FFU-HE/24/48/
RSR
/BC/ECM/115/10//CT//HEPA//ECMDX//WK/DSW/PC/TMB/ATS/
ML
/
FL
/WPF/PL-AL/F-AL/PL-B12/F-B12
LED Operation
Option
Code
LED
Color
Action
Notes
Filter LED
FL
Green
None
Indicates normal operation until filter pressure drop exceeds calibrat-
ed pressure drop (factory set at 1.5x clean filter pressure).
Yellow
Change Filter
Indicates filter pressure drop has exceeded calbirated setting (factory
set at 1.5x clean filter pressure.
Motor
LED
ML
Green
None
Indicates normal motor operation when the static pressure is above
0.2" w.g.
Red
Troubleshoot Motor
Indicates motor is not in operation, and that unit static pressure is
below 0.2" w.g.
Calibration
Filter LED will come factory set to activate at the pressure drops listed in the Table below.
Filter
Pressure @ 90fpm [in w.g.]
1.5x Clean Filter [in w.g.]
HEPA
0.4
0.6
ULPA
0.6
0.9
If different set points are desired, they can be adjusted as follows:
STEP 1:
Remove Loctite from adjustment screw hole.
Filter Indicator Set Points
Pressure Switch Adjustment
25
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