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ICMA S303 User Manual

ICMA S303
24 pages
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DIGITAL CONTROL UNIT FOR THERMAL
SOLAR SYSTEMS - Art. S303
ICMA S.p.a. - Heating Technologies - www.icmaspa.it FIS303ENCL - 01/2022
Icma SpA - Via Garavaglia, 4 - 20012 Cuggiono (MI) ITALY Tel: +39 02 97249134 - +39 02 97249135
www.icmaspa.it - sales@icmaspa.it
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ICMA S303 Specifications

General IconGeneral
Supply Voltage24 VDC
Operating Temperature-20°C to +60°C
Digital Inputs8
Analog Inputs4
Analog Outputs2
EnclosureIP20
MountingDIN Rail
ProcessorARM Cortex-M4
Flash Memory512 KB
Operating Voltage24 VDC
Communication InterfaceEthernet, RS-485
ProtocolsModbus TCP, Modbus RTU
Communication InterfacesEthernet, RS-485

Summary

DESCRIPTION OF THE KEYS

OVERVIEW

AVAILABLE ACCESSORIES AND SPARES

Lists optional accessories and spare parts for the control unit.

TECHNICAL FEATURES

Details technical specifications like power supply, sensors, operating range, and dimensions.

INSTALLATION

STARTING

TURNING ON AND OFF

Instructions for powering the control unit on and off using the 'esc' key.

BACKLIGHT

Explains how the display backlight is activated and its auto-off function.

ACOUSTIC SIGNALS

Describes the internal buzzer for user feedback and its disable option.

TEST FUNCTION FOR LOAD WIRINGS CHECK

Details the test to verify functionality of connected loads and outputs.

TEMPERATURE AND SPEED DISPLAY

How the unit displays measured temperatures and pump speeds.

AUTOMATIC / ABC (Automatic Boiler Control) OPERATION

Explains the two operating modes: Automatic and ABC control.

INSTALLER PARAMETERS

Entering the Password

Guide on how to enter the correct password to access installer parameters.

Modifying the Password

Steps to change the existing password for installer access.

P2: SETTING THE THERMAL DATA

Allows setting thermal data like safety temperatures, differentials, and hysteresis.

P3: ANTIFROST PARAMETER MANAGEMENT

Configuration of parameters related to the antifrost function.

P4: ACOUSTIC SIGNAL MANAGEMENT

Enables or disables acoustic signals like keyboard tones and alarms.

P5: RELAY LOGIC SELECTION

Allows reversing the output logic for relays, specifically OUT 2.

P6: INTEGRATION HOURS COUNTER

Displays or resets the operating hours of the integrative source.

P7: LIMITATION OF COLLECTOR MINIMUM TEMPERATURE

Manages the Minimum Temperature Thermostat for collector pump activation.

P8: PWM and 0..10V OUTPUT SETTINGS

Adjusts settings for pump control via PWM or 0-10V output.

P9: COLLECTOR RESET TEMPERATURE

Sets the 'T SF' temperature for collector pump reset to avoid thermal shock.

P10: VACUUM TUBES

Configures operating programs for systems with vacuum tubes, prioritizing safety.

P11: ANTI-LEGIONELLA

Enables or disables the Anti-legionella function for boiler water heating cycles.

CONTROL LOGIC

CONTROL LOGIC IN ABC

Explains the logic behind the 'ABC' function and its impact on differential control.

CONTROL LOGIC OF THE SAFETY THERMOSTATS

Describes how safety thermostats function and trigger alarm relays.

Condition for the alarm relay activation

Details the conditions under which the alarm relay is activated based on temperature readings.

AVAILABLE DIAGRAMS

SCH 01

Solar heating installation with 1 tank and no integrative heat source.

SCH 02

Solar heating installation with 1 tank and additional thermostatic heating.

SCH 03

Pool solar heating installation diagram.

SCH 04

Solar heating installation with 1 tank, direct integration by valve logic.

SCH 05

Natural circulation solar heating installation with 1 tank and direct integration.

SCH 06

Solar heating installation with 1 tank and only 2 probes.

FUNCTIONS ACCESSIBLE TO THE USER

Enabling the anti-legionella function

Allows the user to enable or disable the Anti-legionella function.

Alarm Reset / Reset of the 30-days counter

Provides functionality to reset alarms or the 30-day counter.

User menu

Access to specific user parameters like max temperatures and antifrost settings.

TROUBLESHOOTING

WARRANTY