Siemens ACR12.3 1 Series User Manual

CE1N3573E
17.08.2001
Siemens Building Technologies
HVAC Products
3
573
ACR12.320/ALG ACR12.321/ALG
ACR12.340/ALG ACR12.341/ALG
Fan coil controller
for wall mounting
ACR12.3x0
ACR12.3x1
Pulse width modulated (PWM) valve outputs for thermic actuators, AC 230 V
P or PI control behaviour selectable
3-speed fan control, automatic and manual
Manual switching between heating and cooling operation, or automatic with
changeover (C/O) sensor QAH11
Potential-free input for window contact or occupancy detector
Inbuilt room temperature sensor
Three operating modes: Comfort / Economy / Standby
The status of the operating mode switch
( è
èè
è ) and changeover switch
(
/ ) are memorised on power failure.
Use
For controlling the room temperature in individual rooms and zones which are heated
and cooled by fan coils. The controllers are suitable for 2- or 4-pipe applications with
manual and automatic fan control.
For control of
• a 3-speed fan
• two valve actuator with ACR12.34x/ALG for 4-pipe applications
• a valve with an electric heater up to 2850 VA with ACR12.32x/ALG
for 2-pipe applications

Siemens ACR12.3 1 Series Specifications

General

Product type	Controller
Supply voltage	24 V DC
Analog inputs	2
Protection class	IP20
Input Voltage	24 V DC
Output Current	0.5 A
Communication Interface	RS485
Operating Temperature	0°C to +55°C

Summary

Fan Coil Controller for Wall Mounting

Product Models and Key Features

Identifies ACR12.3x0/3x1 models and lists core capabilities like PWM outputs, fan control, and operating modes.

Application and Intended Use

Details the controller's purpose in managing room temperature for fan coil systems.

Controller Functionality and Technical Design

Operational Modes and Control Logic

Explains heating/cooling changeover, fan speed control, operating modes, and P/PI control.

Setpoint Management and Type Summary

Details setpoints for different modes and provides a summary of controller types.

System Integration and Configuration

Control Sequence Diagrams

Illustrates control output variations for 4-pipe and 2-pipe fan coil system configurations.

Electric Heater and Changeover Features

Details integration of electric heaters and automatic/manual heating/cooling changeover.

Device Settings and Fan Control

Explains fan speed selection logic, hysteresis, and device configuration via DIP switches.

Installation, Wiring, and Safety

Terminal Assignments and DIP Switch Functions

Details terminal connections, DIP switch functions, and provides wiring diagrams.

Installation and Safety Guidelines

Outlines safety instructions, required checks, and proper handling of the controller.

Technical Specifications and Dimensions

Electrical Data and Input/Output Specs

Lists power supply, frequency, consumption, and specifications for outputs and inputs.

Environmental, Norms, and Physical Dimensions

Covers operating conditions, standards compliance, and controller physical dimensions.