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OpenAir

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Electronic Damper Actuator

Designed for UL Listed Fire/Smoke and Smoke Control Dampers

53 lb.-in. Torque
2-position, 15-second Run Time
15-second Spring Return Time

N474

TM

GND Series

GND Series Electronic Damper Actuator.

Description

Intended for use on UL listed smoke control dampers and

combination re/smoke rated dampers, the OpenAir GND

Series Direct Coupled, Fast-Acting, Two-position, Spring
Electronic Actuators are available in 24 Vac/dc, 120 Vac,
and 230 Vac models.

Features

• Manual override

• 24 Vac/dc, 120 Vac and 230 Vac models available

• Reversible fail-safe spring return

• All metal housing

• Pre-cabled Teon® insulated lead wires

• Fifteen-second operation at rated torque, temperature
and voltage

• Assembled in the U.S.A.

Options

• Optional built-in auxiliary switches: Fixed switch points
at 5° and 85° rotation

• Optional built-in Electronic Fusible Link (EFL) capability
with four temperature ratings: 165°F (74°C), 212°F
(100°C), 250°F (121°C), 350°F (177°C)

Applications

The GND Series Spring Return Electronic Actuator is
used for the control of dampers requiring up to 53 lb-in
(6 Nm) driving torque. It is intended for control of UL listed
smoke control dampers and combination re/smoke
HVAC dampers. This actuator is designed to meet the
2002 revisions to the UL 555/555S and the AMCA

Standard 520 specications.

B-31

Damper Actuators

Siemens
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PLUS 3 Warranty

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GND Series Specifications

Operating Voltage ................................................................ 24 Vac ±20%

............................................................................24 Vdc +20%, -10%

.................................................................................... 120 Vac ±10%

.................................................................................... 230 Vac ±10%

Frequency ................................................................................... 50/60 Hz

Power Consumption ..................................................................24 Vac/dc

Running .................................................................................20 VA/12W

Holding ......................................................................................8 VA/6W

Power Consumption .......................................................120 Vac/230 Vac

Running and Holding ..............................................................20 VA/9VA

Torque

Running Torque ...........................................53 lb.-in. (6 Nm) (minimum)

Stall Torque (minimum) .............................................160 lb.-in. (18 Nm)

Runtime for 90° ............................................................. 15 sec. nominal

Closing (on power loss) with Spring Return ....................... 15 sec. Max.

Nominal Angle of Rotation ................................................................. 95°

Life Expectancy ...................................Minimum 35,000 full stroke cycles

Mounting

Damper Shaft Size ................................................0.5" (12.7 mm) round

Damper Shaft Length, Minimum.........................................1.4" (36 mm)

Housing

Enclosure .................................................................................. NEMA 1

Material ............................................................Die-cast Aluminum Alloy

B-32

GND Series Product Ordering

Description Cabling

2-position

2-position with aux. switches

Ordering Note

• EFL Electronic Fusible Links must be ordered separately
(see table below).

• All products are available in bulk packages of 10.

Damper Actuators

Add /B to part number to order a bulk pack.

Temperature

Operation........................................................ 0 to 140°F (-18 to +60°C)

One time 350°F (177°C)

Storage and Transport...............................-40 to +158°F (-40 to +70°C)

Humidity ................................................Max. 95% RH, non-condensing

Teon Cable .................................................................... 400°F (200°C)

Agency Certication.......................................................................UL873

cUL C22.2 No. 24-93

AS/NZS 2064 1/2:1997

Conforms to CE requirements for the

EMC and low voltage directives

Australian Electromagnetic
Compatibility (EMC) per AS/NZS

4251.1/2:1999 (C-tick)

Pre-cabled Connection ...........................................18 AWG, 3 ft. (0.9 m)

............................................. 3/8" (0.5mm) exible conduit connector

Dimensions ............................................................ 9" H X 3.25" W X 3" D

..................................................(229 mm H X 83 mm W X 76 mm D)

Shipping Weight ....................................................................4 lb. (1.8 kg)

*Refer to the Installation Instructions for acceptable mounting positions.

Part No.

24 Vac/dc 120 Vac 230 Vac

Standard GND121.1U GND221.1U GND321.1U
EFL GND121.1U/F GND221.1U/F GND321.1U/F
Standard GND126.1U GND226.1U GND326.1U
EFL GND126.1U/F GND226.1U/F GND326.1U/F

Electronic Fusible Links

Temperature Range Part No.
165°F (74°C) ASK79.165
212°F (100°C) ASK79.212
250°F (121°C) ASK79.250
350°F (177°C) ASK79.350

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