Siemens ASC77.2U User Manual

OpenAir™ External Auxiliary Switch

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)

EA1175R1

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 rating

DC rating

Insulation system Double insulated

Switch A Recommended

usage Switch B 0° to 90° with 5° intervals Recommended usage Switching hysteresis 2°

Agency certification

Conduit Connection Threaded 1/2-inch

Shipping Weight 1.1 lb (0.48 kg)

AC 6A resistive AC 2 FLA, 12 LRA 12 Vdc to 30 Vdc DC 2A

Switch range 0° to 90° with 5° intervals

0° to 45°

45° to 90°

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

NSPT, flex only

Warning/Caution Notations

WARNING:

CAUTION:

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.

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.

ASK75.3U

ASK75.1U

EA1191R1

ASK75.3U

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 factoryinstalled 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).

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.

Manual Override

1-Turn

EA1192R1

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

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.

PUSH

EA1190R1

Figure 4.

Insert Shaft Adapter at Position A.

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).

NOTE:

GCA/GBB/GIB models use the larger ring. GMA/GEB models use smaller ring. See Figure 1.

EA1177R1

Figure 6. Attaching the EAS Position Adapter Ring.

Page 2 of 5 Siemens Building Technologies, Inc.

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