P a g e 6 • D R I S T E E M R e t r o f i t a c t u a t o r i n s t r u c t i o n s
Figure 6-1:
Mounting MS40-707X and MS40-715X and setting-up actuator/linkage/valve assembly.
A s s e m b l y
3-Way valve actuator replacement
Spring-return actuators without manual override
MS40-707X and MS40-715X
• Install the actuator onto the linkage and 3-way valve, and set-up
the assembly according to Figure 6-1 below.
2
3
2
Tip:
A 1-5/8" open-end wrench can be used to
measure the amount of rotation (measured between
opposite sides of the slot).
L
R
L
LOCK
L
R
L
1
2
3
Tip:
• MS40-707X, MS40-715X Proportional Control - Change the
reversing switch setting from direct acting (L) to reverse acting (R),
and then apply power to drive the actuator to the end of stroke.
When finished, return the switch setting to direct acting (L).
1 MS40-707X and MS40-715X
actuators are shipped at the
end of stroke, without preload.
6 Apply power to the actuator to rotate it CCW into alignment
with the mounting plate, and then slide anti-rotation screw
NYBA-161 halfway into the slot on the bottom of the
actuator. Tighten the nut on the anti-rotation screw.
Warning:
Take care not to pinch your fingers or hand
between the actuator and the mounting plate, when
powering the actuator into alignment.
Caution:
When setting the valve preload, power must be
used to position the actuator. Do not manually force the
actuator into the mounting position. If forced, damage to the
pinion shaft or improper close-off may occur.
1-3/8"
3 Align the actuator with the
mounting plate, then rotate it
10° CW. Note that 1-3/8"
movement at the anti-rotation
slot (measured at the anti-
rotation slot's centerline) is
sufficiently equal to 10°.
4 Make sure the actuator is in
full contact with the plastic
stand-offs on the linkage.
5 Holding the actuator at the 10°
position, use a 10 mm wrench or
socket to tighten the two nuts
equally on the shaft clamp, 8 to
10 lb-ft (11 to 14 N-m).
2 Slide the actuator, "L" side
facing out, onto the linkage's
pinion shaft.
10°
Optional: Affix the Open and
Closed labels to the indicator
in the appropriate positions.
OPEN
CLOSED
NYBA-161
Anti-Rotation Screw for
MS40-707X, MS40-715X
2
1-5/8"
1-5/8" Open-End
Wrench
1 Rotate the linkage's pinion shaft CCW,
to retract the rack (stem up).
• Apply power to the actuator and check the system's operation for
proper operation, in response to the control signal.
• For electronic hydraulic actuator to DuraDrive actuator change-
over, refer to the wiring diagram on page 7.
• For existing DuraDrive to DuraDrive actuator change-over, refer
to wiring diagrams supplied with your humidifier.
