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9Operating manual for the auroMATIC 620 0020094404_00 Controller
3.4 Operating modes
By setting the operating mode, you determine the con-
ditions under which the assigned heating circuit or hot
water circuit will be controlled.
Heating circuit
Operating
mode
Effect
Auto The operation of the heating circuits alternates
between the Heating and Energy saving modes in
accordance with a predetermined timer pro-
gramme.
Eco The operation of the heating circuit alternates
between the "Heating" and "Off" modes in
accordance with a preset timer programme.
The heating circuit is switched off during the set-
back period if the frost protection function
(depending on the outside temperature) is not
activated.
The frost protection is effective outside the set
time window (¬ Chap. 5.3).
Heating The heating is regulated at the daytime set room
temperature.
Energy
saving
The heating circuit is regulated at the nighttime
set room temperature.
Off The heating circuit is off if the frost protection
function (depending on the external temperature)
is not activated.
Symbol Meaning
If the symbol is displayed after the Eco or Auto
mode, a time window is active. The heating instal-
lation is producing heat.
If the symbol is displayed after the
mode, no time window is active.
The heating installation is in set-back mode.
Table 3.2 Operating modes for heating circuits
Circulation circuit and hot water circuit
Operating
mode
Effect
Auto The commands for charging the DHW cylinder or
for enabling the circulation pump are given accor-
ding to a preset
timer programme.
On The charging of the DHW cylinder is constantly
enabled. When required, the cylinder is recharged
immediately. The circulation pump is constantly in
operation.
Off No charging of the DHW cylinder takes place. The
circulation pump is not operating.
Exception: If the temperature in the DHW cylin-
der falls below 12 °C, the cylinder is reheated to
17 °C (frost protection).
Table 3.3 Operating modes for the circulation circuit and the
hot water circuit
i
If Holiday is displayed instead of the opera-
ting mode, the holiday programme is active.
When the holiday programme is active, the
operating mode cannot be set.
Description of the appliance 3
11


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