Siemens OpenAir GCA161.1U User Manual

OpenAir™
Technical Instructions
Document No. 155-173P25
EA GCA-1
May 19, 2014
GCA Series Spring Return 160 lb-in
Electronic Damper Actuators
Siemens Industry, Inc.
Description
The OpenAir 24 Vac/dc spring return 160 lb-in (18 Nm) electronic actuator is designed for
digital or analog control of building HVAC dampers.
Features
• Brushless DC motor technology with stall protection
• Bi-directional fail-safe spring return
• Patented self-centering shaft coupling
• Manual override
• 160 lb-in (18 Nm) torque
• 5° preload as shipped from factory
• Offset and span adjustment models available
• Models with independently adjustable dual auxiliary switches available
• UL and cUL listed;
certified
Application
These actuators are designed for use in constant or variable air volume installations for the
control of return air, mixed air, exhaust, and face and bypass dampers requiring up to
160 lb-in (18 Nm) torque. They are designed for applications that require the damper to
return to a fail-safe position when there is a power failure.

Siemens OpenAir GCA161.1U Specifications

General

Type	Room Controller
Power Supply	24 V AC/DC
Analog Inputs	2
Communication Protocol	BACnet MS/TP
Outputs	Analog outputs
Operating Voltage	24 V AC/DC
Analog Outputs	2
Communication	BACnet MS/TP
Operating Temperature	0 °C
Relative Humidity	non-condensing

Summary

Specifications

Agency Certification

Power Supply

Control Signal

Describes input signal types and voltage ranges for actuator control.

Feedback Signal

Function

Mounting

Covers shaft size, minimum shaft length, and mounting considerations.

Auxiliary Features

Accessories

Tandem Mount Bracket

NEMA 3R Weather Shield

Provides NEMA 3R protection when installed with the actuator.

NEMA Type 4X Weather Shield

Provides NEMA Type 4X protection against environmental elements.

Operation Modes

2-Position Control

Floating Control

Modulating Control

Control Signal Adjustment

Minimum and Maximum Adjustment

Explains how to adjust offset and span for control signal inputs.

Dual Auxiliary Switch

Settings

Details the adjustment of switches A and B for desired operation.

Sizing

Sizing Table and Selection

Guide to selecting the correct actuator based on torque requirements.

Mounting and Installation

NEMA 2 Mounting Positions

NEMA 3R Mounting Position

Actuator Mounting Orientation and Damper Control

Table detailing actuator mounting and corresponding damper control actions.

Manual Override and Range Adjustment

Manual Override Operation

Instructions for rotating, locking, and releasing the actuator manually.

Mechanical Range Adjustment

Wiring and DIP Switch Configuration

Implementation of DIP Switch Features

Self-Adapt Feature

Tandem Application DIP Switch Settings

Wire Designations and Control Diagrams

Modulating Control Diagrams

2-Position Control Diagrams

Floating Control Diagrams

Tandem Application Wiring Diagram

Start-Up and Commissioning

GCA12x/GCA22x Checks

Commissioning steps for 2-position control actuators.

GCA13x Checks

Commissioning steps for floating control actuators.

GCA15x/GCA16x Checks

Commissioning steps for modulating control actuators.

Troubleshooting and Dimensions

Troubleshooting Steps

Guidance on checking connections, settings, voltage, and damper blockages.