Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 106

9 Settings
106
Full charging: The cylinder is fully charged at every DHW demand.
Full charging legio: The cylinder is fully charged if the legionella function
is enabled; otherwise it is only recharged.
Full charg 1st time day: During the first charging of the day, the cylinder
is fully charged, then recharged.
Full charg 1st time legio: The cylinder is fully charged during the first
charging of the day and if the legionella function is enabled; otherwise it
is recharged
Explanations:
Full charging: The stratification cylinder is fully charged. The heat de­
mand is triggered by the top cylinder sensor TWF (B3), and ended by
sensors TWF and TLF (B36) or TWF2 (B31). If only one B3 is installed,
recharging takes place automatically.
Recharging: The stratification cylinder is recharged i.e. only the area up
to the cylinder sensor TWF (B3) is heated. The heat demand is triggered
and ended by the top cylinder sensor TWF (B3).
Switching diff (5024)
If the DHW temperature is lower than the current setpoint minus the
switching difference set here, the DHW charging is started. The DHW
charging is ended if the temperature of the current setpoint is reached.
Note
At the first DHW release of the day, forced charging is performed.
The DHW charging is also started if the DHW temperature is with­
in the switching difference – as long as it is not less than 1 K un­
der the setpoint.
Charging time limitation (5030)
During the DHW charging, the room heater - depending on the selected
charging priority (prog.no. 1630) and the hydraulic switch – has too little or
no power. It is therefore often practical to restrict the time of DHW charg­
ing.
Discharging protection (5040)
This function ensures that the DHW circulation pump (Q3) only switches
on when the temperature in the heat source is high enough.
Application with sensor
The charging pump is only switched on when the heat source temper­
ature is above the DHW temperature plus half of the heating excess. If
the boiler temperature drops below the DHW temperature plus 1/8 of
the charging excess during the charging again, the charging pump is
switched off again. If two DHW sensors for the DHW charging are par­
ameterized, the lower temperature is considered for the discharge
safety function (normally the DHW sensor B31).
Application with thermostat
The primary pump is only switched on if the boiler temperature is
above the set DHW temperature. If the boiler temperature drops be­
low the DHW nominal setpoint minus the DHW switching difference,
charging pump is switched off again.
Off: The function is switched off.
Always: The function is always active.
Automatically: The function is only active if the heat generator cannot
deliver heat or is not available (malfunction, generator lock).
Charging temp max (5050)
With this setting, the maximum charging temperature for the connected
storage of the solar system is limited. If the DHW-charging value is excee­
ded, the collector pump switches off.
Note
The collector pump can be re-activated by the collector overheat­
ing protecting function (see programme number 3850) until the
storage safety temperature has been reached.
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