Item No.
Qty.
Description
9
2
1
⁄
2
in. Dia. Hose Clamp
10
9
1
⁄
4
in.- 20 x
1
⁄
2
in. Bolt
11
10
1
/
4
in.-20 Spinlock Nut
12
1
1
⁄
4
in.- 20 x
1
⁄
2
in. Press Stud
13
1
Standoff Bracket
14
1
Side Bracket without Bearing
15
1
1" Dia. Bearing
16
1
Crankarm Assembly
Tools Required:
Wrenches:
(1)
3
⁄
8
in., (2)
1
⁄
2
in., (1)
7
⁄
16
in.,
and (1)
3
⁄
4
in.
Item No.
Qty
Description
1
1
External Plate
2
1
Lower Support Bracket
3
1
Side Bracket with Bearing
4
1
Upper Support Bracket
5
1
1
⁄
2
in. Rod
6
1
Actuator Siemens Cat 11
7
1
Crankarm
8
8
1
⁄
4
in.- 20 x
1
⁄
2
in. Bolt
Document Number 483438
Siemens #6 Actuator
Model 331-2856 & 332-2856
UL Listed Pneumatic Actuator with Spring Return
Installation, Operation and Maintenance Manual
Note: For dampers installed in ducts or sleeves.
This Siemens actuator is a pneumatic actuator with a 11 square inch effective diaphragm area and a 4 inch stroke.
It extends to its holding position when air pressure is applied and spring returns to its fail position when the air
supply is interrupted. This model has a maximum air pressure of 25 psi.
Kit No.
Actuator
914989
Pneumatic Actuator 331-2856
914990
Pneumatic Actuator 332-2856
Note the damper shaft rotation for fail direction
and orient the linkage appropriately. Position
the crankarm in one of the positions shown.
Attach the crankarm to the clevis on the
actuator with the clevis pin and the hitch pin
supplied through hole "A" shown.
