Greenheck GND User Manual
Technical Instructions
Document No. 155-746
EA GND-1
March 17, 2005
OpenAir™ GND Series Electronic Damper Actuator
UL Listed Fire/Smoke and Smoke Control Dampers
2-Position, 15-second Run Time,
15-second Spring Return Time
Description
N474
The OpenAir™ direct coupled, fast-acting, two-position, spring return electronic actuators
are available as 24 Vac/dc, 120 Vac, and 230 Vac models. They are intended for use on
UL listed smoke control dampers and combination fire/smoke rated dampers.
Features
Application
• 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).
• Reversible fail-safe spring return.
• All metal housing.
• Pre-cabled Teflon® insulated lead wires.
• Fifteen-second operation at rated torque, temperature and voltage.
This actuator is used for the control of dampers requiring up to 53 lb-in (6Nm) driving
torque. It is intended for control of UL listed smoke control dampers and combination
fire/smoke HVAC dampers. This actuator is designed to meet the 2002 revisions to the
UL 555/555S and the AMCA Standard 520 specifications.
Siemens Building Technologies, Inc.
Technical Instructions OpenAir GND Series Electronic Damper Actuator UL Listed Fire/Smoke Control Dampers
Document No. 155-746
March 17, 2005
Product Numbers
Direct-coupled Electronic Fire and Smoke Damper Actuator
G
Spring Return 53 lb-in (6 Nm)
N
15 second run time
D
24 Vac/dc
1
120 Vac
2
230 Vac
3
2-position
2
Standard version
1
Two auxiliary switches
6
Fire and smoke shaft adapter
.1
Assembled in USA
U
Bulk pack 10
/B
Electronic Fusible Link (EFL) connection
/F
EFL connection and bulk pack 10
/F/B
Warning/Caution Notations
Service
WARNING
CAUTION:
WARNING:
Do not open the actuator. Personal injury may occur if opened. Opening the
actuator voids the warranty.
If the actuator is inoperative, replace the unit.
Personal injury/loss of life may occur if you do
not perform a procedure as specified.
Equipment damage may occur if you do not
perform a procedure as specified.
Page 2 of 7 Siemens Building Technologies, Inc.
OpenAir GND Series Electronic Damper Actuator UL Listed Fire/Smoke Control Dampers Technical Instructions
Document No. 155-746
March 17, 2005
Specifications
Power supply
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 20 VA
holding 9 VA
Function
Running torque 53 lb-in (6 Nm) (minimum)
Stall torque (minimum) 160 lb-in (18 Nm)
Torque reduction at elevated temperature Less than 10%
Runtime for 90° 15 seconds nominal
closing (on power loss) with spring return 15 seconds maximum
Nominal angle of rotation 95°
Life Expectancy
Minimum 35,000 full stroke cycles
Mounting
Housing
Ambient conditions
Agency certification
Miscellaneous
Damper shaft size .5-inch (12,7 mm) round
Damper shaft length, minimum 1.4-inch (36 mm)
Enclosure NEMA 1
Material Die cast aluminum alloy
Operation 0°F to 140°F (-18°C to 60°C)
one time 350°F (177°C)
Storage and transport –40°F to 158°F (–40°C to 70°C)
Ambient humidity (non-condensing) Maximum 95% rh non-condensing
Teflon® cable 400°F (200°C)
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 feet (.9 meter)
3/8-in (.5mm) flexible conduit connector
Dimensions 9-in. × 3.25-in. × 3-in. D
(229 mm × 83 mm × 76 mm)
Weight ≈4 lb (1.8 kg)
Siemens Building Technologies, Inc. Page 3 of 7
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