Wiring
This is the most common wiring method used. The damper has an electric switch to open power
to the actuator and spring the damper closed.
HOT
120 or
24 VAC
TYPICAL FIRE - SMOKE COMBINATION DAMPER WIRING
165°F
Smoke Detector or Relay from area
smoke detection system
BELIMO
FSxx
ACTUATOR
TYPICAL SENSOR
TEMPERATURES
N or
COM
Electric thermal disc
To alarm
system
Regardless of the wiring routes used, this drawing shows the wiring necessary for a UL555S
damper and actuator. Use it as a basis for any of the other wiring schematics. Note that the
alarm connections are not touched when replacing an actuator. This is a major concern for Fire
Marshals.
The drawing below is typical of a smoke control only damper or a negator spring
damper.
In some rare cases fusible links
may have been used. In those
cases the wiring for the actuator
will be similar to this.
HOT
120 or
24 VAC
Smoke Detector or Relay from area
smoke detection system
BELIMO
FSxx
ACTUATOR
N or
COM
Fusible link DAMPER ACTUATOR WIRING
WARNING!
Note that where any fire alarm wiring is touched, the
fire department must be informed.
Ruskin Phillips P150 to Belimo FSNF or FSAF March 2018
16
