MBAS/FBAS Pressure Switch Diagram
FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
Motor/Filter Indicator BAS (MBAS/FBAS)
Sample line string below:
FFU-HE/24/48/RSR/BC/ECM/115/10//CT//HEPA//ECMDX//WK/DSW/PC/TMB/ATS/
MBAS
/
FBAS
/WPF/PL-AL/F-AL/PL-B12/
F-B12
Operation
Option
Code
Action
Notes
Motor BAS
MBAS
Troubleshoot
Motor
Closes a dry contact to let the BAS signal pass through when the static
pressure is less than 0.2" w.g. indicating the motor is not operating.
Filter BAS
FBAS
Change
Filter
Closes a dry contact to let the BAS signal pass through when the static
pressure is greater than the calibrated pressure drop (factory set at 1.5x
clean filter).
Unit will come factory calibrated; no additional field modifications are required.
Wire unit terminal block according to wiring diagrams found starting on page 51 of this manual.
NOTE:
Wiring should be carried out by a certified electrician and meet national and local electrical codes.
FFU-HE
Pressure switch(es) completes signal when
failure is reached (as per chart above)
BAS Signal In
31
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