Installation Instructions

ManualsBrandsSiemens ManualsDamper actuatorsOpenAir GCA Series Spring Return 160 lb-in Electronic Damper Actuators Technical Instructions

Document No. 129-404

April 13, 2020

Page 4 of 7 Siemens Industry, Inc.

Manual Override

Figure 9. Manual Override.

To use manual override or set preload, do the

following: (Figure 9)

1. Insert the 3 mm hex key in the override opening,

(Step 1).

2. Turn the key in the direction of the arrow until you

reach the desired degree of opening, (Step 2).

3. Hold the key in place, (Step 3).

4. Insert a small flat-blade screwdriver into the gear

train lock pin. Turn the screwdriver in the same

direction as the arrow until you hear a click or meet

slight resistance, (Step 4).

CAUTION:

When engaging the gear train lock pin,

cautiously turn only about 5 degrees

until you hear a click or meet slight

resistance. Turning too far will strip the

lock pin.

5. Remove the key or keep it in place, (Step 5).

To release manual override or preload

1. Insert the 3 mm hex key in the override opening,

(Step 6).

2. Turn the key only a short distance in the direction of

the arrow, (Step 7).

3. Remove the key, (Step 8).

The actuator will return to 0 (fail-safe) position.

NOTE: Applying power and sending a control

signal will release manual override.

Mechanical Range Adjustment

Figure 10. The Angular Rotation is Adjustable Between 0°

and 90° at 5 Degree Intervals.

Ensure that the actuator is in the 0 (fail-safe) position when making

this adjustment. If making the adjustment before the actuator is in

service, take into account the factory set 5° preload. To release the

preload, see To Release Manual Override or Preload section.

Other settings

For adjustment of auxiliary switches and span/offset options see the

Technical Instructions listed under References.

Tandem Operation

Two GCA Actuators with 2-position or floating control signal are

mounted to the same side of the damper shaft using the ASK73.1

Tandem Mounting Bracket as shown in Figure 11.

Two GCA Actuators with a modulating control signal are mounted to

the same side of the damper shaft using the ASK73.2U Tandem

Mounting Bracket also as shown in Figure 11.

Figure 11. Tandem Mounting on Same Side of Damper Shaft.

NOTE: For applications requiring single damper shaft operation by

up to four GCA modulating control signal actuators mounted

on each side of the damper shaft, use the GCA15x Series

Actuators with Master/Slave mode operation selected. See

Figure 12.

(See Wiring Diagrams for GCA15x Series master/slave operation

wiring instructions.) (See OpenAir™ Spring Return Electric Damper

Actuator Modulating Control Technical Instructions document

155-173P25 for complete tandem mounting instructions.)