Main Functions; Mode Of Operation - LEGRAND 674 56 Notice D'installation

2 - Description of the Control unit

2.4 - Main functions

Control Unit 674 56, which can only be used for the My Home Legrand temperature control
function, can set the system and modify the mode of operation. Coming with management
software with guided menus shown on the display, it lets the user select the mode of operation,
display the temperatures of the individual zones and display and change the daily temperature
profiles and the weekly programs, while the maintenance menu, reserved for the installer (code
protected), gives access to the system settings (zone configuration, system test, total reset...). The
Control Unit can manage heating and cooling systems up to a maximum of 99 zones. An input
contact can be connected for the remote control (switching from antifreeze mode to automatic
mode and vice versa) by telephone actuator

2.5 - Mode of operation

7 different modes of operation can be selected:
• Weekly
3 weekly programs can be created for each of the two functions (heating and cooling); daily
temperature profiles (0h – 24h), different for each day of the week and for each zone, can be
defined for each of these.
• Manual
In this mode a fixed temperature can be set on the whole system and on the individual
zone without time bands; for the individual zone, when the manual mode is switched off
operation is automatically reset on the last programming set.
• Scenarios
In this mode scenarios can be defined which the user activates as required; these scenarios
set a predefined temperature in the various zones. Up to 16 scenarios can be defined for
winter operation and 16 for summer operation and for each of these the temperature to be
set is associated with each zone.
• Holiday
The Holiday mode can select a particular daily profile for a set period. The program is run
until the date and time programmed, after which the weekly program selected is reset.
• Holidays
This mode keeps the system in Antifreeze or Heat protection until the date and time set.
At the end the weekly program selected is reset.
• OFF
When this mode of operation is entered the Control Unit switches off all the selected zones
until one of the other modes is reset.
• Antifreeze / Heat protection
In this mode the system sets the antifreeze or heat protection temperature on the whole
system or on the individual zone on the basis of the current system function (summer/
winter).
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