Alpha E-Tec Plus 28NX - Page 46

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Fig. 6.14
Fig. 6.15
Fig. 6.16
6.16 SCREED HEATER FUNCTION (Sm)
The boiler is equipped with a function to perform the thermal shock on new radiant panel systems, as required by
the applicable standard. Setting the upper and lower temperatures.
Contact the manufacturer of the radiant panels for the thermal shock characteristics and its execution.
To be able to activate the function there must be no remote control connected, while in case of system divided into
zones it must be properly connected, both hydraulically and electrically.
Activation of the function will display the lower temperature set
(default 25°C, range 20 - 45°C), which can be edited by pressing
the 'MODE' button and using the CH ( ) +/- buttons and finally
confirmed by always pressing the 'MODE' button. The adjusted set
flashes for 2 seconds after the last time a button was pressed.
After confirming the lower set point, the upper temperature set point
is displayed (default 45°C, range 25 - 50°C), which can be edited in
the same way. Confirmation by pressing the 'MODE' button will save
the value and the Screed Heater function is activated.
If no button is pressed for 2 minutes during these temperature
selections, the function is abandoned and the display goes back into
Off mode.
The screen will now alternately display the countdown of days
(short duration) and current flow temperature (long duration)
simultaneously with the normal operating information (CH request,
flame, fault symbols etc.).
Screed Heater Function - continued
The Screed Heater function lasts for a total of 7 days, 3 days at the lower temperature set and 4 days at the higher
temperature set (see Fig. 6.17).
After activating the function, the lower set (range 20 - 45°C, default = 25°C) and the higher set (range 25 - 55°C, default = 45°C)
appear in sequence.
In case of failure or lack of supply voltage, the function is suspended and will resume when the normal operating conditions
are reset from the point where it was interrupted.
When the time expires, the boiler automatically goes back to Off mode, the function can also be stopped by pressing the
'RESET' button.
Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning
46