Brochure
MK-121xx Series
62
© Copyright 2006 TAC. All Rights Reserved. F-27383-1
Damper Actuators, Proportional
Model Chart
Specifications
For proportional pneumatic actuator with 3 in.
2
(19 cm
2
) effective area used to control small
dampers and mixing boxes.
Features:
• All-plastic construction.
• Meets UL-465 requirements for air plenum mounting.
• Ideal for VAV terminal unit control.
Model No.
Nominal
Operating
Range
Stroke
Starting
Pressure
Non-
Adjustable
Maximum Force
a
a
Force and torques based on factory set stroke, starting pressure, and 90q rotation of driven damper shaft.
Nominal Torque
b
Proportional Control
a
b
Nominal torque for actuators is based on 1.5 psi (10 kPa) pressure change at the actuator.
Return
Stroke
Power Stroke
Based on
1.5 psi
Pressure
to
Actuator
15 psi
Supply
Dual
Press.
System
15 psi
Supply
Single
Press.
System
c
c
Adjust pressure reducing valve so that listed pressures are available at the actuator.
20 psi
Supply
Single or
Dual
Press.
System
c
15 psi
Supply
Dual
Press.
System
15 psi
Supply
Single
Press.
System
c
20 psi
Supply
Single or
Dual
Press.
System
c
psi in. psi lb lb lb lb lb-in. lb-in. lb-in.
MK-12100 3 to 8
2
3 4.5 16.5 21 36
4.5
4.5 4.5
MK-12110 5 to 10 5 10.5 10.5 15 30
MK-12120 8 to 13 8 19.5
1.5 6 21 1.5
MK-12140 3 to 13 3 4.5
Construction
Housing
Rynite
£
, Zytel
£
, and Ultem
£
UL-94-5V flame rated plastic material to meet UL-465 requirements for
air plenum mounting.
Diaphragm Beaded molded neoprene.
Stroke 2 in. (50.8 mm).
Nominal Damper Area Actuator sizing should be done in accordance with damper manufacturer’s specifications.
Spring Retracts actuator shaft on loss of air pressure.
Maximum air pressure 30 psig (207 kPa).
Ambient temperature limits
Shipping -40 to 180qF (-40 to 82qC).
Operating -20 to 150qF (-29 to 66qC).
Air connections Barbed for 1/4 in. and 5/32 in. O.D. plastic tube [for runs up to 20 ft. (6 m)].
Mounting
In any position. Mounting bracket and ball joint connector for 5/16 in. diameter push rod assembled to
actuator.
Dimensions 5-5/8 H x 3-9/16 W x 3-5/16 D in. (143 x 90 x 84 mm).
MK
-
121
x
x
Series