1 Square shaft inserted into damper sleeve with special crankarm. If a smoke damper,
replacement may be possible and requires a new shaft and other linkage parts. If a
combination fire and smoke damper, Belimo may not be capable of being used. See Air
Balance with MP2553.
2 Typically these were linkaged using a crank arm on the square motor shaft and the spring
was on the round shaft. Remove all linkage parts and direct couple to damper shaft.
3 Safe-Air / Imperial. Typically linkaged. There was an internal spring and fusible link for the
fire function.
4 Except in rare occasions where space constraints exist, simply remove all linkage parts and
direct couple on damper shaft. Use old motor as a mounting platform for anti-rotation strap
5 Usually on a Negator Spring damper. For pneumatic, the FSLF120 will usually work. For
electric, the Ruskin kit FSLF120/MP must be ordered from a Ruskin rep.
6 10 in-lb. "A" model = CW rotation; plain = CCW. Check voltage. FSLF replaces both in most
cases. Use FSTF when linkages necessary
7 10 in-lb. "A" model = CW rotation; plain = CCW. Check voltage. FSLF replaces both in most
cases. Use FSTF when linkages necessary.
8 Inside clamp mounting or a shaft extension required.
9 See Greenheck Installation Instructions. Typically these were linkaged using a crank arm on
the square shaft and the spring was on the round shaft. Remove all linkage parts and direct
couple to damper shaft.
10 See Greenheck Installation Instructions. Typically these were linkaged using a crank arm on
the square shaft and the spring was on the round shaft. Remove all linkage parts and direct
couple to damper shaft
11 Some were direct coupled to the damper shaft with an external spring. Some were linkaged
using a crank arm on the square motor shaft and the spring was on the round shaft.
Remove all linkage parts and direct couple.
12 Some were direct coupled to the damper shaft with an external spring. Some were linkaged
using a crank arm on the square motor shaft and the spring was on the round shaft.
Remove all linkage parts and direct couple.
13
https://www.belimo.us/mam/americas/technical_documents/pdf-
web/fire_and_smoke_doc/nailor_multiproducts_to_belimo_fs_instructions.pdf
14 Nailor. Remove linkage parts and mount to damper shaft. FSLF for dampers < 4 sq.ft. and
FSNF for dameprs > 4 sq.ft.
15 Nailor. Remove linkage parts and mount to damper shaft. FSLF for dampers < 4 sq.ft. and
FSNF for dameprs > 4 sq.ft.
16
Typically these were linkaged using a crank arm on the square motor shaft and the spring
was on the round shaft. Remove spring and all linkage parts and direct couple to damper
shaft.
Safe-Air Honeywell ML & MS Motors with Belimo FSNF120 Series March 2018
9
