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Siemens ASC77.2U Installation Instructions

Openair external auxiliary switch
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OpenAir™ External Auxiliary Switch
a

Product Description

The OpenAir External Auxiliary Switch (EAS) provides
switch functionality for standard model damper actuators
with easy installation for in-service units.
Product Number
ASC77.2U

Specifications

Dual Auxiliary Switches
AC rating
DC rating
Insulation system
Switch range
Switch A
Recommended
usage
Switch B
Recommended
usage
Switching hysteresis
Agency certification
Conduit Connection
Shipping Weight
Item Number 129-420, Rev. 010
b
f
Figure 1. External Auxiliary Switch Kit Contents.
24 Vac to 250 Vac
AC 6A resistive
AC 2 FLA, 12 LRA
12 Vdc to 30 Vdc
DC 2A
Double insulated
0° to 90° with 5° intervals
0° to 45°
0° to 90° with 5° intervals
45° to 90°
2°
UL listed to UL 873
cUL certified to Canadian
Standard C22.2
No. 24-93
Electromagnetic
compatibility 89/336/EEC
Low voltage directive
73/23/EEC
Threaded 1/2-inch
NSPT, flex only
1.1 lb (0.48 kg)
g
e
d
c
Warning/Caution Notations
WARNING:
CAUTION:

Required Tools

Phillips screwdrivers
No. 2 for screws, No. 1 for adjustment
Expected Installation Time
15 minutes
Prerequisites

Installation Instructions

Document No. 129-420
December 13, 2004
a. External dual auxiliary switch
b. Position indicator
c.
GCA/GBB/GIB position adapter
d. GMA/GEB position adapter
e. 3 mm hex key
f.
Plastic mounting adapter inserts (2)
g. Threaded M5 × 25 screws (2)
Personal injury/loss of life
may occur if you do not follow
the procedures as specified.
Equipment damage, or loss of
data may occur if you do not
follow the procedures as
specified.
CAUTION:
Remove power from in-service damper
actuator before installing external
auxiliary switch.
WARNING:
Do not open the external auxiliary switch.
ASK75.3U
or
ASK75.1U
ASK75.3U
or
ASK75.1U
Figure 2. NEMA Type 3R Rating Only
With Use of Weather Shield.
Page 1 of 5

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Summary of Contents for Siemens ASC77.2U

  • Page 1: Installation Instructions

    OpenAir™ External Auxiliary Switch Product Description The OpenAir External Auxiliary Switch (EAS) provides switch functionality for standard model damper actuators with easy installation for in-service units. Product Number ASC77.2U Specifications Dual Auxiliary Switches 24 Vac to 250 Vac AC rating...

  • Page 2: Installation

    NOTE: For in-service actuators, skip Removing Pre- load. For new actuators, remove the factory- installed 5° pre-load. Removing Preload Before the External Auxiliary Switch can be installed on a new, out-of-the-box actuator, you must remove the factory-installed preload. New Non-Spring Return Actuators Insert shaft adapter at position A (See Figure 4).
  • Page 3 3. Mount the position indicator on the face of the EAS (See Figure 8 step 2 and Figure 9, step 2). Figure 8. For GMA/GEB Actuators, Use Top Screw Holes. Siemens Building Technologies, Inc. Figure 9. For GCA, GBB, GIB Actuators, Use the Bottom Screw Holes.

  • Page 4: Manual Override

    Release pressure to set the switch. The switch is now set. 45 55 45 55 55 45 35 55 45 35 Figure 12. Press In, Turn to Adjust, Release to Set Switch. Page 4 of 5 Wiring Wiring Designation 0∞ 5∞...
  • Page 5 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. OpenAir is a trademark of Siemens Building Technologies, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners.