Reading The Input Data; Setting The Anti-Legionella Function; Selecting The Load Relief Stage; Setting The Minimum Temperature - Vaillant aroSTOR VWL BM 270/5 Installation And Maintenance Instructions Manual

Note
When photovoltaic mode has the higher prior-
ity, domestic hot water is also heated during
periods that have not been set (e.g. holiday
mode and outside of programmed time peri-
ods).
If you only want to heat the domestic hot wa-
ter during the permitted time period, set the
priority to no.
▶
Press the rotary knob to confirm the selection.
◁
The immersion heater is supplied with electricity in
order to use the energy from the photovoltaic install-
ation.
◁
When the fan mode is activated (FAN MODE), op-
tion 3 can no longer be selected.
◁
The SHED DING function is not available.
▶
Press the menu button to return to the original display.
8.4

Reading the input data

1. If you want to read the product's input data, you must
select this menu. DI SPLAY → INST.MENU.
2. Press the rotary knob in the DI SPLAY menu.
◁
WATE R = Domestic hot water temperature in the
central section of the domestic hot water cylinder
◁
AIR INLET = Air temperature at the air intake
◁
T_EV APOR = Temperature of the evaporator
◁
If PV MODE is deactivated:
–
SHED DING : Connection contact no. 1/low-tariff
contact input (0: Contact opened; 1: Contact
closed)
–
FAN CONTR. : Connection contact no. 2/hygro-
stat input (0: Contact opened; 1: Contact closed)
◁
If PV MODE is activated:
–
PV ECO : Connection contact no. 1 input (0:
Contact opened; 1: Contact closed)
–
PV MAX : Connection contact no. 2 input (0:
Contact opened; 1: Contact closed)
3. Press the menu button to return to the original display.
8.5

Setting the anti-legionella function

Danger!
Risk of death from legionella.
Legionella multiply at temperatures below
60 °C.
▶
Ensure that the end user is familiar with
all of the Anti-legionella measures in order
to comply with the applicable regulations
regarding legionella prevention.
The anti-legionella function heats the water in the product to
a temperature between 60 °C and 70 °C. The default fact-
ory setting for the target temperature is 60 °C and the anti-
legionella function is not carried out.
If the target temperature is below 60 °C, you can activate the
anti-legionella function by setting the target temperature to
a value between 60 °C and maximum 70 °C. The automatic
cycle for heating the water is activated at 22:00.
0020290840_00 aroSTOR Installation and maintenance instructions
Adapting the unit to the installation 8
If the target temperature for the cycle is not reached within
24 hours, the cycle stops and then starts again at the next
interval deadline. If an anti-legionella cycle is interrupted by
a time period in which the back-up heater is prevented from
operating (high tariff or time programming), the anti-legion-
ella function will be restarted in the next interval deadline.
▶
Observe the applicable regulations regarding legionella
prevention.
▶
Turn the rotary knob to set the time interval (in days) for
the anti-legionella function. SET TINGS → ANTI -BACT.
→ INST.MENU .
▶
Press the rotary knob.
▶
Select the time interval between two anti-legionella func-
tion charges.
Note
The time interval can be between 0 and 99
days.
▶
Press the rotary knob to confirm the selection.
▶
Press the menu button to return to the original display.
8.6

Selecting the load relief stage

Condition: Cable for low-tariff/high-tariff load relief connected
▶
Select the components that can be used during high-
tariff periods.
–
Heat pump only
–
Heat pump and immersion heater
▶
Turn the rotary knob to set the mode. INST.MENU →
SET TINGS → SHED DING.
◁
0 = No components may operate in the high-tariff
periods
◁
1 = Only the heat pump may operate in the high-tariff
periods
◁
2 = The heat pump and immersion heater may oper-
ate in the high-tariff periods
Note
When using a low-tariff connection,
you should not set any additional time-
programming.
▶
Press the menu button to return to the original display.
▶
If you are using a high-tariff connection, inform the end
user of the optimal energy use.
8.7

Setting the minimum temperature

You can use the minimum temperature function to prevent
the domestic hot water temperature falling below 38 °C. In
doing so, the back-up heater (immersion heater) supports
the heat pump until a domestic hot water temperature of
43 °C has been reached.
Depending on the parameter selection when setting the load
relief stage, the minimum temperature function may not be
available in high-tariff periods under certain circumstances.
INST.MENU → SET TINGS → T°C MINI
▶
Press the rotary knob.
▶
Turn the rotary knob and select a hot water temperature
of 43 °C.
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