Zone 2 Set: Target water temperature for zone 2
TFI: Actual water temperature of zone 2 measured by the TFI sensor
a: 4 minute off time (sample period) between 230V~ pulses (sample period set using FC59)
b: AC230V pulse duration determined by dividing the valve opening time (from valve specification)
by 12 (the maximum number of pulses available from the hydro unit software)
Example: for a valve with a drive time specification of 60 seconds:
b = 60 / 12 = 5 seconds pulse duration
On initial power up the mixing valve drives to the fully CLOSED position and then back to the mid
position. This gives the mixing valve a reference position to start the temperature control for zone
2
Once the valve has reached the mid-point reference position there is a 4 minute OFF delay
(sampling period) before the valve drive to the next position. During this time the hydro unit
software measures the value of TFI and compares the measured temperature to the target water
temperature, for zone 2, set on the ESTIA remote controller
If the temperature, measured by the TFI sensor, is lower than the target water temperature
setpoint, then the mixing valve will OPEN by one step and then the software will recalculate the
required operation during the next 4 minute OFF period
If the temperature, measured by the TFI sensor, is higher than the target water temperature
setpoint, then the mixing valve will CLOSE by one step and then the software will recalculate the
required operation during the next 4 minute OFF period
6. Anti bacteria control (hot water mode)
The anti-bacteria control on ESTIA is used to prevent Legionella bacteria in the hot water system.
Set the following function codes:
Hydro unit function code – FC0A: Sets the water temperature, inside the hot water
cylinder, during the anti-bacteria cycle
Hydro unit function code – FC0B: Sets the duration of the anti-bacteria function once the
cylinder water temperature has reached the cycle start temperature set by FC0A
Remote controller function code – RCFC0C: Sets the anti-bacteria cycle start time
Remote controller function code – RCFC0D: Sets the anti-bacteria cycle operating
frequency
When the function codes have been set press the button on the ESTIA remote
controller. This will activate the anti-bacteria cycle set in the function codes above
When the anti-bacteria cycle is activated the anti-bacteria symbol (shown below) will be shown
on the ESTIA remote controller display
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