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MP918A,B
Used for proportional control of
medium- to large-size dampers in
HVAC systems. The MP918A,B are
rolling diaphragm, piston-type
actuators. The MP918A has a
positive positioner. Replacement
devices are available for Johnson,
Powers, Robertshaw, Barber-
Colman, and older Honeywell
actuator models.
SPECIFICATIONS
Actuator Type .......................................Damper
Actuator Force .....................................High
Fail Safe Mode .....................................Spring Return
Air Connections ....................................5/32 in. push-on barb (Pilot),
1/4 in. push-on barb (main.)
Stroke ................................................... 3 1/2 in. (90 mm)
Diaphragm Effective Area .................... 23.8 sq in. (154 sq cm)
Temperature Range .............................-20 F to 158 F (-29 C to 70 C)
Maximum Operating Pressure .............25 psi (172 kPa)
Humidity Range ...................................5 to 95% RH
APPROVALS
Underwriters Laboratories, Inc. ........... Components Recognized:
Report R18118
ACCESSORIES
14004062-001—External Trunnion Mounting Bracket
14004062-002—Internal N.C. Trunnion Mounting Bracket
14004062-003—Internal N.O. Trunnion Mounting Bracket
14004106-001—Actuator pushrod for conversion of internal N.C. to
external
14004107-001—Crankarm Assembly for conversion from internal N.C.
to external Trunnion mounting
14004210-001—Feedback Spring Kit includes orange spring (3 psi
[21kPa]), yellow spring (5 psi [34 kPa]), and blue spring (10 psi [69
kPa]).
14004241-002—Hitch Pin (Six Sets)
14004242-001—MP918 Top Mount Operator Assembly
14004667-001—Offset Crank arm assembly with 2 screws
(304725-062), nuts (14004102-001), crank arm (14004655-001) for
1/2 in. Drive Axle
14004236-001—Coupler, actuator shaft to 5/16 in, 8 mm, pushrod
CCT2718—Threaded rod for shaft extension
CCT2725—Rod coupling for shaft extension
REPLACEMENT PARTS
14004264-001—MP918 Repair kit including Positive Positioner,
bracket assembly and fittings
14004264-002—MP918 Positive Positioner Retrofit Kit - includes 10 psi
feedback spring
FEATURES
• Rolling diaphragm operated.
• Low friction shaft bearing.
• Close tolerance on operating range and stroke.
• Versatile mounting and connecting hardware.
• Non-overlapping spring ranges for sequencing.
• Reliable-long life.
DIMENSIONS DIAGRAMS
Actuator with External Trunnion Mounting Bracket
Actuator with Internal N.C. Trunnion Mounting Bracket
Actuator with Internal N.O. Trunnion Mounting Bracket
18-1/4 (465) MP918B
6-7/8
(175)
4 (102)
MIN.
M27099
20-1/2 (520) MP918A
14004062-001
1-7/16
(36)
M27100
8-1/2
(215)
MP918B
10-7/8
(275)
MP918A
3/8 (10) CLEARANCE
18-3/4 (475) MP918B
21 (535) MP918A
14004062-002
M27101
8 (205)
MP918B
10-3/8
(265)
MP918A
18-3/4 (475) MP918B
21 (535) MP918A
14004062-003
3-3/8
(86)
REF.
Pneumatic Damper Actuator
MP918A,B