Greenheck GND Installation Manual

Part Number 473707

!

Siemens GND Series Actuators

Mounted Internally

Installation Instructions

These instructions apply to the internal field replacement of the Siemens Series actuators on Greenheck VCD
control damper models.

Tools Required:

Wrenches: (1) 1/2 in., (1) 7/16 in.,

(1) 3/8 in., (1) 10 mm

ACTUATOR PART #
GND121.1U 24V 383774
GND126.1U 120V 383775
GND221.1U 120V 383776
GND226.1U 120V 383777
GND321.1U 230V 383778
GND362.1U 120V 383779

ITEM # QTY PART # DESCRIPTION

1 1 723981 INTERNAL ACTUATOR BRKT
2 1 839475 DRIVE LINK ASSEMBLY
3 1 829206 1/2" CRANKARM ASSEMBLY
4 1 451588 1/4" E-RING
5 1 593831 6.5" JACKSHAFT, 1/2" DIA.
6 1 415385 10-32 KEPS NUT
7 1 846591 1/2" ANTI-ROTATION BRKT. ASM
8 1 416122 THREADED MOUNTING STUD

9 2 415264 1/4-20x1/2 TCS
10 1 SEE CHART ACTUATOR
11 1 370159 1/2" SNAP IN BEARING
12 1 416179 RETAINING RING 1/2"

Figure 1: Siemens Series internal mount (exploded view).

WARNING

!

Equipment Damage or Electrical
Power Hazard. Line voltage can cause
death or serious injury and short
equipment circuitry. Disconnect power
supply before installation.

CAUTION

!

Device Malfunction Hazard. Improper
set screw tightening causes device
malfunction. Tighten set screws with

Blade Axle Bracket

Damper Blade

1.563 in.
(39mm)

1.75 in. (44mm)
Blade Lever Hole
Location

.203 in. (5.2mm) Diameter.
(2)

Detail A

proper torque to prevent damper
shaft slippage.

Instructions Siemens GND Series

These installation instructions assume a damper is
already mounted in a duct or sleeve. Have damper
blades in the fail position.

1. Drill (2) .203 inch holes in the third blade from
bottom, at location shown in Detail A.

2. Attach blade drive lever to blades using (2) 1/4”

20 x 1/2” thread cutting screws, self drilling
screws or 1/4” - 20 x 1 1/4” bolts.

3. Fasten internal actuator bracket (item 1) to the

left jamb of damper frame using (2) thread cutting
screws. Snap bearing (item 11) into the internal
actuator bracket (item 1).

4. Snap bearing (item 11) into the anti-rotation

bracket (item 7) and attach to the internal mount
bracket (item 1) using [2] thread cutting screws
(item 9).

5. Slide 1/2” diameter rod (item 5) slightly through

the anti rotation bracket (item 7). Install crankarm
(item 3) and drive link (item 2) onto the 1/2”
diameter rod and (item 5) and install retaining
ring (item 12) to lock drive link onto the internal
actuator bracket (item 1).

6. Install threaded mounted stud (item 8) to the anti

rotation bracket (item 7) using #10-32 Keps nut
(item 6).

7. Attach actuator (item 10) to the anti-rotation

bracket assembly (item 7). Tighten actuator onto
shaft.

8. Connect drive link to blade drive lever using

e-clip. With blades closed and the actuator in its
fail position, position blades in their fail position
and tighten the crankarm to the 1/2 in. shaft.

9. Connect all electrical leads to the actuator. Apply

power to the actuator. The damper blades should
power position and return to the fail position
when power is disconnected.

Model Volts Running Holding

GND121.1 24

GND126.1 24

GND221.1 120

GND226.1 120

GND321.1 230V

GND326.1 230V

0W 0W

0 0

0 0

Copyright © 2010 Greenheck Fan Corporation

473707 GND Series Rev. 1 May 2010