Honeywell MS8120S - Manual (Page 8)

MS4120F; MS4620F; MS8120F; S2024-F; S20230-F FAST-ACTING, TWO-POSITION ACTUATORS
63-2584—10 8
OPERATION
The actuators are designed for use in Smoke Control
Systems. If power fails, the actuator spring returns to the 0°
position. The actuator mounts flush with the damper box. The
actuator drives from 0° to 95° and spring returns back to 0°.
The actuators are operated by an spst two-position controller.
When using an spst two-position controller, the actuator drives
to the damper fully open position when controller contact
makes and spring returns to the damper fully closed position
when controller contact breaks. The actuator drops to holding
power level on detection of stall, independent of hub position.
Cycling
The actuator and the internal spring are designed so that no
special cycling during long-term holding is required.
Honeywell recommends following all local, state, and national
codes for periodic testing of the entire smoke control system.
Refer to National Fire Protection Association (NFPA) National
Fire Codes ® : NFPA90A, NFPA92A, and NFPA92B for your
application.
Auxiliary Switches
Some models include auxiliary switches (see Table 1).
SPST Switches (Table 5)
See Fig. 7 through 9 for SPST auxiliary switch wiring.
Table 5. SPST Auxiliary Switch Operation.
NOTE: Both sets of contacts are open when the actuator
is between 7° and 85°.
SPDT Switches (Fig. 12)
See Fig. 10 through 12 for SPDT auxiliary switch wiring.
Fig. 12. SPDT auxiliary switch operation.
CHECKOUT
MS4120F (120 Vac model)
1. Check damper position.
2. Connect 120 Vac to the black and white leadwires to
drive the damper to the open position. The actuator
should drive the damper.
3. If the actuator does not run, remove power for at least
two seconds.
4. If the actuator spring returns, allow it to close entirely,
then return to step 2.
5. If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
MS4620F; S20230-F (230 Vac
models)
1. Check damper position.
2. Connect 230 Vac to the blue and brown leadwires to
drive the damper to the open position. The actuator
should drive the damper.
3. If the actuator does not run, remove power for at least
two seconds.
4. If the actuator spring returns, allow it to close entirely,
then return to step 2.
5. If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
MS8120F; S2024-F (24 Vac models)
1. Check damper position.
2. Connect 24 Vac to the red and black leadwires to drive
the damper to the open position. The actuator should
drive the damper.
3. If the actuator does not run, remove power for at least
two seconds.
4. If the actuator spring returns, allow it to close entirely,
then return to step 2.
5. If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
Switch
Wire
Color
Makes Breaks
(degrees from fully closed position)
7° blue less than 7 greater than 7
85° yellow greater than 85 less than 85
BLACK/BLUE
BLACK/RED
BLACK/YELLOW
BLACK/BLUE
BLACK/RED
BLACK/YELLOW
LESS 7° MORE 7°
GRAY/BLUE
GRAY/RED
GRAY/YELLOW
GRAY/BLUE
GRAY/RED
GRAY/YELLOW
LESS 85° MORE 85°
7° SWITCH 85° SWITCH
M20679B