Gewiss ChorusSmart KNX Timed Thermostat/Programmer

Introduction

The Gewiss ChorusSmart KNX timed thermostat with humidity management is designed for automatic weekly control of humidification/dehumidification systems, integrated with temperature regulation. It can manage heating, cooling, and humidity levels by commanding KNX actuators. The device can operate in autonomous mode or as a master in multi-zone systems.

Key Features

• Operation Modes: Heating and Cooling with independent control algorithms.
• 5 Operating Modes: OFF (anti-freeze/high temperature protection), Economy, Pre-comfort, Comfort, and Automatic.
• Temperature Settings: Up to 4 adjustable temperatures for heating and cooling.
• Control Modes: Master (for multi-zone systems) or Autonomous.
• Control Stages: Single stage or dual stage for systems with high thermal inertia.
• Control Algorithms: 2-point (ON/OFF or 0%/100%), proportional PI (PWM or continuous), and fan coil (max 3 speeds).
• Outputs: 1 relay with NO/NC potential-free contact.
• Inputs: 1 input for potential-free contact (e.g., window contact) and 1 configurable input for an external NTC temperature sensor or potential-free contact.
• Display: Backlit RGB LCD display with ambient light sensor for automatic brightness adjustment.
• Power: Powered via KNX bus, with battery backup (2x AA, not included) for date and time maintenance during bus power failure.
• Humidity Management: Receives humidity data from external KNX sensors, estimates local humidity, and can manage up to 5 humidity thresholds.
• Programming: Weekly programming with independent hourly profiles for each day, 15-minute resolution.
• Scenarios: Memorization and activation of 8 scenes.

Installation Instructions

Important: Installation must be performed by qualified personnel, adhering to current regulations and KNX installation guidelines.

• The timed thermostat consists of a removable front part and a fixed part. For security, the two parts can be secured together with a supplied screw.
• Correct Positioning: Avoid installing the thermostat in niches, near doors/windows, radiators, or air-conditioning units, and protect it from drafts and direct sunlight to ensure accurate ambient temperature readings.
• KNX Installation Recommendations:
• Maximum BUS line length: 350 meters (thermostat to power supply), 700 meters (thermostat to furthest KNX device).
• Avoid ring circuits to prevent unwanted signals and overvoltages.
• Maintain a minimum distance of 4 mm between BUS cables and electrical lines.
• Do not damage the shielding's electrical continuity conductor.
• Unused BUS signal cables and the continuity conductor must not touch live elements or the earth conductor.
• Electrical Connections: Connect the BUS cable (red to '+', black to '-') to the terminal. Up to 4 BUS lines can be connected. Insulate unused wires. Insert the BUS terminal into the device and secure with the cover for minimum separation distance. Connect inputs and output contacts to the screw terminals.
• Battery Installation/Replacement: Separate the front part from the fixed part. Insert two 1.5V AA batteries, observing polarity. Reconnect the front part. Replace all batteries simultaneously with the same type.

User Instructions

• Bus Power Failure: The device will resume its previous state upon restoration of bus power. The internal battery maintains date and time.
• Maintenance: No specific maintenance is required. Clean with a dry cloth if necessary.
• Parameter Setting: Detailed information is available in the Programming Manual on the Gewiss website.
• Programming with ETS: Configuration is done using ETS software. Refer to the Technical Manual on the Gewiss website for details.

Technical Data

• Communication: KNX BUS
• Power Supply: KNX BUS (29V DC SELV) + 2x 1.5V AA batteries (backup)
• Current Absorption (BUS): 10 mA
• BUS Cable: KNX TP1
• Command Elements: 4 front buttons, 1 programming button
• Outputs: 1 relay (NO/NC, potential-free), Max switching current 5A (250V AC)
• Inputs: 1x potential-free contact, 1x external temperature sensor (NTC 10K)
• Display: 1x RGB color display with ambient light sensor
• Measurement Elements: 1 internal temperature sensor (range: 0°C to +60°C)
• Temperature Adjustment Ranges: Anti-freeze (+2°C to +7°C), High Temp Protection (+30°C to +40°C), Other Setpoints (+5°C to +40°C)
• Operating Environment: Indoor, dry places
• Operating Temperature: -5°C to +45°C
• Storage Temperature: -25°C to +70°C
• Relative Humidity: Max 93% (non-condensing)
• BUS Connection: 2-pin terminal (Ø 1 mm)
• Electrical Connections: Screw terminals (max. cable section 2.5 mm²)
• Protection Degree: IP20
• Dimensions: 3 Chorus modules
• Standards: Low Voltage Directive 2014/35/EU, EMC Directive 2014/30/EU, EN50090-2-2, EN50428
• Certifications: KNX

Display Signals and Commands

The device features a backlit LCD display and four command push-buttons.

Command Push-buttons:

• Button 1: Select operating mode / Confirm
• Button 2: Adjust temperature (+) / Visualize pages
• Button 3: Adjust temperature (-) / Visualize pages
• Button 4: Set parameters / Program profiles

Display Signals:

• 5: Time / Variable value of hourly profile / Humidity value (Hr, HA, tr)
• 6: Day of the week
• 7: Programming mode indicator
• 8: Settings menu indicator
• 9: Battery charge level indicator (flashing indicates battery-only power)
• 10: Heating activation (1st/2nd stage) (flashing flame indicates alert)
• 11: Cooling activation (1st/2nd stage) (flashing snowflake indicates alert; asterisk on humidity page indicates comfort)
• 12: Heating mode (flashing indicates floor temperature alarm)
• 13: Cooling mode
• 14: Party function
• 15: Holiday function
• 16: Non-workday program
• 17: Enable remote commands (flashing indicates remote command operation)
• 18: Select display page
• 19: Fan coil operating mode (speeds OFF, 1, 2, 3) (flashing fan indicates alert; flashing segments indicate speed waiting for activation)
• 20: Hourly profile visualization (for hourly timer only)
• 21: Timed thermostat in “Master” mode
• 22: Measured temperature / Time / Humidity / Specific humidity / Dew-point temperature (flashing indicates manual setpoint override or humidity probe timeout)
• 23: Temperature measurement unit (°C/°F)
• 24: Auxiliary input status (I = closed contact, O = open contact)
• 25: Thermal gradient self-learning function
• 26: Thermal residual current device
• 27: Timed thermostat mode indicators (Economy, Pre-comfort, Comfort, OFF/AUTO) (flashing segments indicate temporary setpoint override)
• 28: Hourly timer mode (variable profile values)
• 29: Visualize hourly program

Contact Information

For inquiries or support, please contact GEWISS:

GEWISS S.p.a.
Via A. Volta, 1 - 24069 Cenate Sotto (BG) - Italy
Tel: +39 035 946 111
Email: qualitymarks@gewiss.com

GEWISS UK LTD
Unity House, Compass Point Business Park, 9 Stocks Bridge Way, ST IVES
Cambridgeshire, PE27 5JL, United Kingdom
Tel: +44 1954 712757
Email: gewiss-uk@gewiss.com

For detailed programming and technical information, visit www.gewiss.com.