M Motor Actuators
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Y20EBD Valve Linkage for M100 Motor Actuators 17
5. Position the gear housing and rack subassembly over the valve stem
and align the gear housing with the M100 drive shaft.
6. Attach the gear housing to the motor actuator with the washers and
gear housing screws. Do not tighten the screws at this time.
7. Loosen the locking screw and lower the rack subassembly to the
valve stem. Thread the rack subassembly spring housing completely
onto the valve stem.
8. Tighten the jam nut (shown in Figure 16) against the stem connector.
9. Align the actuator with the valve body to avoid binding of the linkage
and tighten the four mounting bolts.
10. Tighten the screws securing the gear housing to 25 in·lb (2.83 N·m)
maximum.
!
CAUTION: Do not perform the following operations if the valve is
under pressure. Shut off pump power, including
standby power, before attempting manual operation.
The procedure for adjusting the travel limits is different for the different
configurations of valves:
• Stem Up Two Way Valve--Drive Down to Close Drive down to close,
spring return open is the most common configuration for heating.
• Stem Up Two Way Valve--Drive Down to Open
• Stem Down Two Way Valve--Drive Up to Open
• Stem Down Two Way Valve--Drive Up to Close
• Stem Up Three Way Valve
• Stem Down Three Way Valve
!
CAUTION: Travel adjustments are made with power connected to
the actuator. On M100A Actuators, always
disconnect power from the actuator before adjusting
the slide stop to increase travel.
Travel Limits
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