Atag BC100124, Appliance Technical Manual

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Hot water supply
The DHW program is always active after start-up.
This is indicated by a solid . The boiler will fire up for DHW
because of the comfort setting.
If there is hot water request, this is indicated by a flashing and
the hot water supply will be activated. The circulation pump will
start circulating and the burner will switch on .
(combi boiler or system boilers with ATAG 3-port diverter kit)
Comfort and eco
By default the hot water supply is set to comfort
(keep hot facility 50°C).
A change to eco is possible by means of pressing the
eco
button.
On the display appears ‘
eco
’.
The eco-position will result in a possible longer DHW waiting time,
because the boiler will not being fired up for pre-heating the hot
water supply.
CH system
The CH program is always active after start-up.
This is indicated by a solid .
If there is heat request, it is indicated by a flashing and the
heating will be put into operation .
The circulation pump will switch on and the boiler will switch on
after 1 to 2 minutes.
When there is no more heat requested the radiator symbol
may be solid or flashing, but the flame symbol will disappear.
The pump will continue to run for 60 seconds due to the pump
over run feature.
Frost protection
Danger of frost
If there is danger of frost damage to the CH installation and there is
no outside sensor connected, it is advisable to let the pump run
continuously.
By pressing both
-
buttons at the same time for 6 seconds the pump
can be switched on continuously.
If the pump is set to continuously this is displayed by a solid .
Installation frost protection
If an outside sensor is connected, then the controls will regulate the
pump:
- In case of outside temperatures b1.5 and -5°C the
pump will run for 10 minutes every 6 hours.
- In case of outside temperatures below -5°C the pump will run in
frost protection mode.
Boiler frost protection
If there is no outside sensor connected, and if the (T1) flow sensor
registers a temperature of 5°C or below in the boiler, the boiler will
fire up. The boiler keeps on firing until the temperature reaches 10°C
(measured on the flow sensor) and the boiler switches off again.
In this mode the symbol will flash.
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