Siemens ASC77.2U is a dual auxiliary switch that can be used to control a variety of devices with its AC/DC rating and double insulated system. It has a wide switch range that can be easily adjusted with the provided hex key, making it suitable for various applications. The ASC77.2U also features a compact design with a variety of mounting options, allowing for flexible integration into existing systems or new installations. It is commonly used with damper actuators, providing easy installation and in-service functionality for standard model damper actuators.
Siemens ASC77.2U is a dual auxiliary switch that can be used to control a variety of devices with its AC/DC rating and double insulated system. It has a wide switch range that can be easily adjusted with the provided hex key, making it suitable for various applications. The ASC77.2U also features a compact design with a variety of mounting options, allowing for flexible integration into existing systems or new installations. It is commonly used with damper actuators, providing easy installation and in-service functionality for standard model damper actuators.
Installation Instructions
Document No. 129-420
December 13, 2004
OpenAir™ External Auxiliary Switch
a
b
c
d
e
f
g
EA1175R1
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)
Figure 1. External Auxiliary Switch Kit Contents.
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 6A resistive
AC rating
AC 2 FLA, 12 LRA
12 Vdc to 30 Vdc
DC rating
DC 2A
Insulation system Double insulated
Switch range
Switch A
0° to 90° with 5° intervals
Recommended
usage
0° to 45°
Switch B 0° to 90° with 5° intervals
Recommended
usage
45° to 90°
Switching hysteresis 2°
UL listed to UL 873
cUL certified to Canadian
Standard C22.2
No. 24-93
Electromagnetic
compatibility 89/336/EEC
Agency certification
Low voltage directive
73/23/EEC
Conduit Connection Threaded 1/2-inch
NSPT, flex only
Shipping Weight 1.1 lb (0.48 kg)
Warning/Caution Notations
WARNING:
Personal injury/loss of life
may occur if you do not follow
the procedures as specified.
CAUTION:
Equipment damage, or loss of
data may occur if you do not
follow the procedures as
specified.
Required Tools
Phillips screwdrivers
No. 2 for screws, No. 1 for adjustment
Expected Installation Time
15 minutes
Prerequisites
CAUTION:
Remove power from in-service damper
actuator before installing external
auxiliary switch.
WARNING:
Do not open the external auxiliary switch.
EA1191R1
ASK75.3U
or
ASK75.1U
ASK75.3U
or
ASK75.1U
Figure 2. NEMA Type 3R Rating Only
With Use of Weather Shield.
Item Number 129-420, Rev. 010 Page 1 of 5
Document No. 129-420
Installation Instructions
December 13, 2004
Installation
New Actuators, Remove Pre-load
GCA, GBB, GIB GMA, GEB
EA1179R1
Figure 3. Determine Actuator Model and Orientation.
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
1. Insert shaft adapter at position A (See Figure 4).
2. Press the manual override button and move the
shaft adapter counterclockwise until actuator
reaches the internal stop (actuator will not move
past this point).
3. Remove the shaft adapter and manually reinstall it
against the external end stop at position B (See
Figure 4).
4. Proceed with EAS installation.
90
90
EA1190R1
PUSH
Figure 4.
Insert Shaft Adapter at Position A.
New Spring Return Actuators
1. Without the shaft adapter installed, using the hex
wrench, wind the manual override one full
revolution and release the wrench (See Figure 5).
The actuator will return to the 0° position and the
preload is now removed.
EA1192R1
1-Turn
Manual
Override
Figure 5.
2. Manually install the shaft adapter against the
external stop on the left end of the actuator. (See
position B in Figure 4.)
Removing Factory Pre-load from New SR Actuator.
Preparing the Actuator Shaft Adapter
1. Remove the position indicator from an in-service
actuator.
2. Determine the appropriate position adapter ring
(See Figure 1).
3. Align and snap the three open notches on the edge
of the EAS position adapter ring in place over the
three raised stubs on the actuator shaft adapter.
(See Figure 6).
B
EA1177R1
NOTE:
GCA/GBB/GIB
models use the
larger ring.
GMA/GEB models
use smaller ring.
See Figure 1.
A
Figure 6. Attaching the EAS Position Adapter Ring.
Page 2 of 5 Siemens Building Technologies, Inc.
Document No. 129-420
Installation Instructions
December 13, 2004
Short shaft applications
NOTE: The short shaft adapter is included in
the packing box with the shaft adapter.
With the short shaft adapter in place, align the
notch of the EAS over the protruding tab on the
position adapter ring and secure in place.
(See Figure 7).
ShortShaft
Adapter
EA1178R1
Figure 7. Attaching EAS to GCA/GIB/GBB Shaft Adapter.
Preparing the EAS for Mounting
2. On the back of the EAS, push the plastic inserts into
the mounting holes. (See Figure 8 and Figure 9).
3. Mount the position indicator on the face of the EAS
(See Figure 8 step 2 and Figure 9, step 2).
EA1182R1
b
f
Figure 8. For GMA/GEB Actuators, Use Top Screw Holes.
f
EA1181R1
b
2
1
Figure 9. For GCA, GBB, GIB Actuators, Use the Bottom
Screw Holes.
Mounting External Auxiliary Switch to
Actuator
1. Nest the alignment peg of the EAS position adapter
ring into the notch (See Figure 10).
The EAS lies flush against the face of the actuator.
EA1183R1
9.5±1.5lb-in(1.1Nm±0.2)
Note: GMA/GEB
actuators use top
screw holes, GCA,
GBB/GIB models
use bottom screw
holes.
2
Figure 10. Bringing the EAS and the Actuator together.
1
2. Secure the EAS in place with the M5×25 screws
provided. (See Figure 10).
CAUTION:
The EAS should not shift when it is
correctly installed firmly against the face
of the actuator.
The installation is complete.
Siemens Building Technologies, Inc. Page 3 of 5
Document No. 129-420
Installation Instructions
December 13, 2004
Manual Override
NOTE: When EAS is installed, you can still access the
manual override capability as shown in Figure
11.
0∞
0
∞
GEB
GBB/GIB
GCA
GMA
EA1185R1
Figure 11. Manual Override.
Auxiliary Switches
CAUTION:
There should be no load on the actuator
when setting the auxiliary switches.
Setting the Switches
With the actuator in the full-closed (0°) position, press in
and turn with a Phillips screwdriver to the desired
setting. Release pressure to set the switch.
The switch is now set.
~3.5
mm
max.
10N
EA1186R1
5
25
45
55
65
75
85
35
15
85
75
65
55
45
35
25
15
5
5
25
45
55
65
75
85
35
15
85
75
65
55
45
35
25
15
5
Figure 12. Press In, Turn to Adjust, Release to Set Switch.
A
B
S1 S1
S4 S4
S2 S3 S2 S3
S5 S6 S5 S6
(Q12)
(Q14)
(Q14)
(Q12)
(Q22)
(Q24)
(Q22)
(Q24)
(Q11)
(Q11)
(Q21)
(Q21)
A
B
5∞
5∞
85∞
2∞
20∞ 30∞ 70∞ 90∞
0∞
10∞
EA1187R1
Figure 13. Example of Switches Set to 5° and 85°.
Wiring
WARNING:
Do not mix operations. Apply only line voltage
or only Class 2 voltages to the switching
outputs of both auxiliary switches A and B.
A
24Vac...250V/6(2)A
(Q12)
(Q14)
(Q24)
(Q22)
S2 S3 S5 S6
S1 S4
(Q11)
(Q21)
B
EA1189R1
Figure 14. Wiring Diagram.
Wiring Designation
Wire Code Color Switch - Function
S1 Gray/red A Input
S2 Gray/blue A – NC
S3 Gray/pink A – NO
S4 Black/red B Input
S5 Black/blue B – NC
S6 Black/pink B – NO
Page 4 of 5 Siemens Building Technologies, Inc.
Document No. 129-420
Installation Instructions
December 13, 2004
Dimensions
4.9
(124,5)
3.7
(94)
1.6
(39,8)
.65
(16,5)
3.6
(91)
.8
(21,5)
.13
(3,5)
2.0
(51,2)
EA1180R1
1.2
(30,5)
Figure 15. External Auxiliary Switch Dimensions in Inches (mm).
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. © 2004 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
Your feedback is important to us. If you have comments
about this document, please send them to
U.S.A.
Document No. 129-420
Country of Origin: US
Page 5 of 5
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Siemens ASC77.2U is a dual auxiliary switch that can be used to control a variety of devices with its AC/DC rating and double insulated system. It has a wide switch range that can be easily adjusted with the provided hex key, making it suitable for various applications. The ASC77.2U also features a compact design with a variety of mounting options, allowing for flexible integration into existing systems or new installations. It is commonly used with damper actuators, providing easy installation and in-service functionality for standard model damper actuators.
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