Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 94

9 Settings
94
Legionella function (1640)
Function to kill legionella germs by heating up to the set legionella function
setpoint (see programme number 1645).
Off: Legionella function is switched off.
Periodically: Legionella function is repeated periodically, depending on
the set value (prog. no. 1641).
Fixed weekday: Legionella function will be activated on a certain week­
day (prog. no. 1642).
Legionella funct periodically (1641)
Setting the interval for the legionella function periodically (recommended
setting in case of additional drinking water heating by solar plant in con­
nection with a storage tank mixing pump).
Legionella funct weekday (1642)
Selection of the weekday for the legionella function.
Legionella funct time (1644)
Setting the start time for the legionella function. With setting --- the legion­
ella function will be carried out the first time DHW heating is enabled.
Legionella funct setpoint (1645)
Selecting the set temperature required for killing the bacteria.
Legionella funct duration (1646)
With this function, the time is set during which the legionella function set­
point is activated to kill germs.
Note
If the colder storage tank temperature rises to above the legionella
function setpoint -1 K, the legionella function setpoint is consid­
ered as met and the timer starts running. If the storage tank tem­
perature drops by more than the switching difference +2K below
the required legionella function setpoint, the duration has to be
met again. If no duration has been set, the legionella function is
met immediately when the legionella function setpoint is reached.
Legionella funct circ pump (1647)
On: The circulation pump will be switched on in case of active legionella
function.
Warning
When legionella function is active, there is a risk of scalding at the
draw-off points.
Circulating pump release (1660)
Time central heating CH3: The circulating pump is released subject to
time program 3 (see prog. no. 540 to 556).
Hot water release: The circulating pump is released when DHW heating
is released.
Time hot water: The circulating pump is released subject to time pro­
gram 4.
Circulating pump cycling (1661)
To save energy, the circulation pump is switched on for 10 minutes and off
for 20 minutes within the release time.
Circulation setpoint (1663)
If a sensor is placed in the drinking water distribution pipe, it monitors reg­
ulation and actual value during the legionella function. The setpoint set
must be observed on the sensor during the dwell time set (prog.no. 1646).
The maximum setting of the circulation value is limited by the nominal set­
point.
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