Specifications
Printed in U.S.A. 1/10 Copyright 2010 Schneider Electric All Rights Reserved. F-12586-11
APPLICATION
Proportional pneumatic actuator with 8 in.
2
(52 cm
2
) effective
area used to control dampers, mixing boxes, air valves, etc.,
in heating, ventilating and air conditioning systems,
MK2-31X1 used for high temperatures.
SPECIFICATIONS
Construction:
Housing, Die cast aluminum.
Diaphragm, Beaded molded neoprene. MK2-31X1 only -
Beaded molded silicone.
Stroke: See Table 2.
Start Point: Adjustable on most models ± 1 psi, see Table 2.
Spring: Retracts actuator shaft on loss of air pressure.
Maximum Air Pressure: 30 psig (207 kPa).
Ambient Temperature Limits:
Shipping, -40 to 160F (-40 to
71C).
Operating, -20 to 160F (-29 to 71C).
MK2-31X1 only,
Shipping, -40 to 250F (-40 to 121C).
Operating, -20 to 250F (-29 to 121C), for 30 minute
exposure 450F (232C).
Air Connections: 1/8” FNPT.
Mounting: In any position. Mounting bracket (except
MK-3300 Series end mounting) and connector for 5/16" (8
mm) diameter push rod included with actuator.
Dimensions: 12" high x 5-7/8" wide x 5-1/2" deep (305 mm
x 143 mm x 140 mm)
ACCESSORIES
AK-42309-500 Positive positioner and linkage, do not use with
MK2-3100 series
AM-111 Crank arm for 5/16
" diameter damper shaft
AM-112 Crank arm for 3/8
" diameter damper shaft
AM-113 Crank arm for 1/2
" diameter damper shaft
AM-115 Crank arm for 7/16
" diameter damper shaft
AM-122 Linkage connector straight type
AM-123 Damper clip
AM-125 5/16
" x 20" damper rod
AM-125-048 5/16
" x 48" damper rod
AM-132 Ball joint connector
AM-161-3 Damper linkage kit
AM-301 90
mounting bracket for pivot mounting
AM-530 Crank arm for 1/2
" diameter damper shaft holes
for 3-1/2
" and 4-1/2" stroke
AM-532 Bolt-on frame lug and damper blade clip kit
AM-533 Actuator shaft extension
AM-534 Pivot stud for pivot mounting
AM-535 Clevis for pivot mounting
AM-536 Mounting plates for pivo
t mounting on ducts or
damper frame
AM-545 Rod end connector for 5/16
" (10 mm) dia. rods
TOOL-95 Pneumatic calibration tool kit
Table-1 Nominal Damper Area For Proportional Control
a
a
For two-position control use proportional rating of the same actuator with
positive positioner. Damper ratings are nominal and based on standard
(not low leakage) dampers at 1" (25.4 mm) W.C. static pressure and 2000
fpm (10 m/s) velocity.
Actuator Part
Number
Parallel Blades Opposed Blades
ft
2
m
2
ft
2
m
2
MK-3101
MK-3101-108
MK2-3101
MK4-3101
MK-3111
MK2-3111
MK-3121-109
MK-3121
MK2-3121
MK-3141
MK4-3141
MK-3151
MK-3161
b
MK-3201
MK-3211
MK-3221
MK-3311-109
MK-3321-102
MK-3801
MK4-3801
MK-3811
MK-3821
MK-3841
MK4-3841
b
Requires 20 psi be available to the actuator.
11.6 1.07 15 1.39
MK4-3111
c
MK4-3811
c
c
Requires minimum 15 psi be available to the actuator.
23.2 2.15 30 2.79
MK4-3121
d
MK4-3821
d
d
Proportional control with positioner (8-13 spring, 20 psi supply).
34.8 3.23 45 4.18
MK-3000 Series, MK2-3000
Series, MK4-3000 Series
Pneumatic Damper Actuators
General Instructions