Honeywell MS4103 manual MP918A,B, Actuator with Internal N.O. Trunnion Mounting Bracket, 100

Pneumatic Damper Actuator

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.

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.

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

DIMENSIONS DIAGRAMS

Actuator with External Trunnion Mounting Bracket

1-7/16

(36)

6-7/8 (175)

4 (102) MIN.

14004062-001

18-1/4 (465) MP918B 20-1/2 (520) MP918A

M27099

Actuator with Internal N.C. Trunnion Mounting Bracket

3/8 (10) CLEARANCE

10-7/8

(275)

MP918A

8-1/2

(215)

MP918B

14004062-002
18-3/4 (475) MP918B
21 (535) MP918A	M27100

Actuator with Internal N.O. Trunnion Mounting Bracket

3-3/8
(86)	10-3/8
REF.
	(265)
	MP918A
	8 (205)
	MP918B
14004062-003
18-3/4 (475) MP918B
21 (535) MP918A	M27101

100