294
EN
cod. 3541V620 - Rev. 00 - 05/2021
ALHENA TECH H
1.3 Connection to the power supply, switching on and off
Boiler not electrically powered
B
To avoid damage caused by freezing during long idle pe-
riods in winter, it is advisable to drain all the water from the
boiler.
Boiler electrically powered
Electrically power to the boiler.
• During the first 5 seconds the display shows the software version of the board and display
(fig. 7).
• For the following 20 seconds the display will show
FH
which identifies the heating system air
venting cycle with the fan running (fig. 8).
• In the next 280 seconds, the venting cycle continues with the fan off (fig. 9).
• Open the gas valve ahead of the boiler
• When the message
Fh
disappears, the boiler is ready to operate automatically whenever hot
water is drawn or in case of a room thermostat request
fig. 7- Switching on / Software version
fig. 8- Vent with fan on
fig. 9- Vent with fan off
MAIN FW 1.00
DSP FW 1.00
FH
2%
Fh
6%
Содержание ALHENA TECH 28 H
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