Non-Standard Stroke - Honeywell MS4103F Instrucciones De Instalación

Measure Damper/Valve Shaft Length
If the shaft is less than 3.25 in. long for SCSA, the shaft
coupling must be located between the damper/valve and
actuator housing. If the shaft length is more than three
inches, the shaft coupling may be located on either side of
the actuator housing.
If the coupling must be moved from one side of the
actuator to the other, reverse the spring return direction
and flip the actuator. Follow these instructions (see Fig. 4):
1. Remove the retainer clip from the shaft coupling and
set it aside for later use.
2. Remove shaft coupling from one side of the actua-
tor.
3. Replace the shaft coupling on the opposite side of
the actuator aligning it based on the stroke labeling.
4. Replace the retainer clip on the shaft coupling using
the groove of the coupling.
Fig. 4. Mounting shaft coupling to actuator opposite

Non-Standard Stroke

Mechanical Stroke Limit Reduction
For applications requiring a span less than 95 degrees, a
simple adjustment can be made. When the rotational
mounting of the shaft coupling is changed, the actuator
drives less than the full 95 degrees stroke.
The stroke is adjustable in 7.5 degree increments. Once
adjusted, the actuator drives until the shaft coupling
reaches the mechanical stop (part of the housing). The
stop causes the motor to discontinue driving and the shaft
coupling drives no farther. When the actuator returns, it
stops at the fail-safe position.
To limit the stroke range, proceed as follows:
1. Remove the retainer clip from the shaft coupling and
set it aside for later use.
2. Remove shaft coupling from the actuator.
3NM FIRE AND SMOKE 250°F SERIES SPRING RETURN DIRECT COUPLED ACTUATORS
side.
3. Rotate the coupling to the desired position, aligning
it based on the stroke labeling. See Fig. 5.
NOTE: The shaft coupling location determines the
travel span.
EXAMPLE: Setting shaft coupling to an approximate
fail-safe position of 30 degrees (as indi-
cated on the housing) limits stroke to 60
degrees. (See Fig. 5.)
4. Install the shaft coupling at this position.
5. Replace the retainer clip on the shaft coupling using
the groove of the coupling.
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Fig. 5. Stroke reduction.
Mounting
CAUTION
Device Malfunction Hazard.
Improper shaft coupling tightening causes
device malfunction.
Tighten shaft coupling with proper torque to pre-
vent damper shaft slippage.
CAUTION
Actuator Damage Hazard.
Using actuator as shaft bearing causes device
damage.
Use actuator only to supply rotational torque. Avoid
any side loads to actuator output coupling bear-
ings.
CAUTION
Equipment Damage Hazard.
Can damage the motor beyond repair.
Never turn the motor shaft by hand or with a
wrench.
Forcibly turning the motor shaft can damage the
gear train.
To mount the actuator to an external drive shaft of a
damper, proceed as follows:
1. Place actuator over damper shaft; and hold mount-
ing bracket in place. See Fig. 8.
2. Mark screw holes on damper housing.
3. Remove actuator and mounting bracket.
4. Drill or center-punch holes for mounting screws (or
use no.10 self-tapping sheet metal screws).
5
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M37465
38-00087EFRTA—01