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3. Auto curve control
The auto curve function allows the software on the hydro unit PCB to automatically calculate the
target water temperature of the system depending the outdoor air temperature (OAT). This function
is only available for 1 zone space heating (water temperature control).
The auto curve function is
NOT
available when:
Using an external room thermostat
Using a 2
nd
RC for room temperature control
Running the system in cooling mode
The auto curve control is set using function codes and by pressing the “Auto” button on the remote
controller.
To set the auto curve temperatures:
STOP the ESTIA system using the remote controller
Set the following function codes to the required setting:
FC27: Sets the auto curve temperature shift / curve adjustment
FC29: Sets the OAT control temperature at point T1 on the diagram above
FC2B: Sets the OAT control temperature at point T3 on the diagram above
FC2C: Sets the target water temperature for the system when the OAT is -20°C
FC2D: Sets the target water temperature for the system when the OAT is at T1 position
FC2E: Sets the target water temperature for the system when the OAT is at T2 position (0°C)
FC2F: Sets the target water temperature for the system when the OAT is at T3 position
FC30: Sets the target water temperature for the system when the OAT is 20°C
FC31: Sets the percentage ratio of the Zone 1 target water temperature to be applied for
Zone 2 control
To activate the auto curve control:
Press on the remote controller to activate space heating
Press on the remote controller to activate the auto curve control
When the auto curve control is active the numerical temperature display for Zone 1 and Zone
2, on the remote controller, is displayed with “A” for each zone
NOTE: If the heating emitter for Zone 2 is an under floor heating circuit then care should be
taken when setting FC31 to prevent any risk of damaging the floor surface due to high water
temperatures