Wiring
There are three wiring schemes that describe all applications. While the geometry of the wire
runs may vary, the connections are straightforward.
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
TEMPERATURE
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.
Where a wiring compartment is needed for junctions, a 2 x 4 box can be attached with a chase
nipple.
Belimo Mechanical
FSLF
FSNF
strap
½” threaded
connector
Chase nipple
2x 4 box and
blank cover
Existing flex connector and
incoming power wires
165 F
Thermodisc
rotation
Anti-
WARNING!
Disconnect and lock out power before starting to disconnect old motor.
Gear Train Motors and Linkages - Replacements with Belimo March 2018
23
