Greenheck 331-2976 Installation and operating instructions

Item No. Qty. Description
981⁄4in.- 20 x 1⁄2in. Bolt
10 21⁄2in. Dia. Hose Clamp
11 10 1/4 in.-20 Spinlock Nut
12 1 1⁄4in.- 20 x 1⁄2in. Press Stud
13 9 1/4 in.-20 x 1⁄2in. Spinlock Bolt
14 1 External Plate
15 1 Crankarm Assembly
16 1 1" Dia. Bearing
Tools Required:
Wrenches:
(1) 3⁄8in., (2) 1⁄2in., (1) 7⁄16 in.,
and (1) 3⁄4in.
Item No. Qty Description
1 1 Standoff Bracket
2 1 Side Bracket w/o Bearing
3 1 Lower Support Bracket
4 1 Upper Cross Support Bracket
5 1 Side Bracket w/ bearing
6 1 1⁄2in. Rod
7 1 Actuator Siemens Cat 10
8 1 Crankarm
Document Number 483437
Siemens #4 Actuator
Model 331-2976 & 332-2976
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
914987 Pneumatic Actuator 331-2976
914988 Pneumatic Actuator 332-2976
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.

Instructions:
1. Run the supply pressure to the actuator and regulate it to a maximum of 25 psi.
2. Apply air pressure to the actuator. The damper blades should fully open or close and return to the fail position when
power is disconnected; if they do not, adjustments can be made by resetting the crankarm position on the damper or
actuator shaft or by changing the distance from the actuator face to the center of the hole in the clevis.
Copyright © 2018 Greenheck Fan Corporation
483437 Siemens #4 Rev. 1 August 2018