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48
4. Close the gas shut-off valve.
!Please note
If outside temperatures of below 3 °C are
expected, take appropriate measures to pro-
tect the system from frost.
If this is the case, please contact your heat-
ing contractor.
Note
As they are not being supplied with power, the circu-
lation pumps and diverter valves may seize up.
If your system has been shut down for a prolonged
period, you may have to reset the "Time" and
"Date": See page 37.
Interrupting the external power supply to the system
No central heating
No DHW heating
Frost protection for the heat generator and the DHW
cylinder is not active.
The system is disconnected from the external power
supply. The fuel cell module is turned off.
Power generation is switched off.
Note
If the duration of the interruption of the external power
supply to the system is more than 6 weeks, trouble-
free operation of the fuel cell module can no longer be
guaranteed. If the external power supply to the system
is interrupted for more than 6 weeks, please notify your
heating contractor.
Unintentional interruption of external power supply
If the system is disconnected from the external power
supply due to an external fault (power cut, triggering of
a safety device), power generation by the fuel cell
module is interrupted.
If a fault message is displayed after the power supply
has been interrupted, please notify your heating con-
tractor.
When the external power supply is reinstated once the
fault has been rectified, power generation resumes
automatically.
1. Turn OFF power generation by the fuel cell mod-
ule: See page 47.
2. Check the operating status of the fuel cell module.
For this, call up the "Fuel cell" menu in
"Information".
Before interrupting the power supply, ensure the
fuel cell module is in the "No power and heat
generation" operating status.
Note
It takes approx. 1 to 2 hours for the shutdown
phase of the fuel cell module to reach the "No
power and heat generation" operating status.
3. Turn off both ON/OFF switches D and E on the
programming unit: See page 48 49.
4. Close the gas shut-off valve.
!Please note
If outside temperatures of below 3 °C are
expected, take appropriate measures to pro-
tect the system from frost.
If this is the case, please contact your heat-
ing contractor.
5. Switch OFF the external power supply.
Note
As they are not being supplied with power, the circu-
lation pumps and diverter valves may seize up.
If your system has been shut down for a prolonged
period, you may have to reset the "Time" and
"Date": See page 37.
Switching on and off
Switching off the system (cont.)
6194132
48


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