Legionella Function - andrews COMBIflo 100/300 Manual

Menu: DHW

Legionella function

Off
The function is deactivated.
Periodically
The legionella function is repeated ac-
cording to the interval set (operating
line 1641). The legionella setpoint is
attained via a solar plant, independent
of the period of time set, the period of
time will be newly started. This means
that the heat source is switched on only
if the solar plant could not deliver the
required "Legionella function setpoint"
within the adjusted period of time.
Fixed weekday
The legionella function can be activated
on a fixed weekday (operating line
1642). When using this setting, heating
up to the legionella setpoint takes place
on the selected weekday, independent
of previous storage tank temperatures.
This setting is intended primarily for
plant with no solar integration.
Legionella funct periodically
Setting "Legionella funct periodically" is
used to select after how many week-
days the function shall be activated
again. (This setting is active only if pa-
rameter "Legionella function" is set to
"Periodically").
Legionella funct weekday
Parameter "Legionella funct weekday"
is used to select on which weekday the
function shall be performed. The functi-
on is carried out on the selected week-
day, independent of the availability of
alternative energy.
Legionella function time
The legionella function is started at the
time set. The DHW setpoint is raised to
the adjusted legionella setpoint and
DHW charging is started.
If no time is parameterized, the legio-
nella function is started on the respecti-
ve day together with the first normal
release of DHW heating. If no release
of DHW heating is scheduled for that
day (continuously reduced), the legio-
nella function will be performed
at 24:00.
Andrews COMBIfl o
Line no. Operating line
1640 Legionella function
Off
Periodically
Fixed weekday
1641 Legionella funct periodically
1642 Legionella funct weekday
Mo - Su
1644 Legionella function time
1645 Legionella funct setpoint
1646 Legionella funct duration
1647 Legionella funct. circ. pump
Off
On
If DHW heating is switched off (DHW
operating mode button = off or holi-
days), the legionella function will be
made up for as soon as DHW heating
is switched on again (DHW operating
mode button = on or end of holiday
period).
Legionella funct setpoint
The higher the temperature level of the
storage tank, the shorter the required
dwelling time at that level.
Legionella funct duration
The demanded "Legionella function
setpoint" must be continuously maintai-
ned during the dwelling time set. If the
storage tank temperature (in the case
of 2 sensors, the temperature acquired
by the "colder" sensor) exceeds the
"Legionella function setpoint" minus 1
K, the "Legionella function setpoint" is
considered fulfilled and the "Dwelling
time" timer elapses. If the storage tank
temperature drops below the deman-
ded "Legionella function setpoint" by
more than the switching differential plus
2 K before the dwelling time has
elapsed, the dwelling time must be ful-
filled again. If no dwelling time is set,
the "Legionella" function is performed
the moment the "Legionella function
setpoint" is reached.
If the "Legionella" function cannot be
performed within a 48-hour period, an
error message will be delivered.
20
Factory setting
Off
All 3 days
Monday
- - : - -
65°C
30 min
On
Legionella funct circ pump
When the function is activated, the cir-
culating pump is switched on while the
"Legionella" function is performed as
soon as the storage tank temperature
(in the case of 2 sensors the tempera-
ture acquired by the "colder" sensor)
lies above the "Legionella function set-
point" minus 1 K. The pump runs during
the dwelling time set. If the storage
tank temperature falls below the de-
manded "Legionella function setpoint"
by more than the DHW switching diffe-
rential plus 2 K, the circulating pump
will prematurely be deactivated.
During the time the legionella function
is performed, the DHW circulating
pump can be activated.
Controls programming guide