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12 Boiler controls
Before the electrical power is switched on, it helps to know the operation of the boiler in advance. On this
page the controls are described in short. The next page describes the button functions and the symbols on
the screen.
The boiler is equipped with self-managing control system. This control system takes over a large part of the
manual settings, which simplies the start-up of the installation considerably.
After lling the installation and switching on the electrical power supply a short start-up program is activated.
This shows all digits, boiler type and software version and the automatic air purge program is activated. The
automatic air purge program lasts for approx. 7 minutes and stops automatically. The boiler res up for DHW
to bring the primary heat exchanger to the set comfort temperature. Then the boiler will switch on for the
enabled program (CH or DHW) (See chapter 11 ‘Filling and bleeding boiler and installation’).
DHW controls (combination boilers)
If a hot water tap is opened the ow sensor measures (F1) the amount drawn o. Depending on the
desired DHW temperature and volume the controls will calculate an output. This realises the desired water
temperature in an ecient way. The hot water sensor (T3) will adjust any minor deviations caused by
temperature uctuations so that even under these circumstances the desired temperature is constant.
CH controls
With a demand from the heating controls after DHW demand, the boiler
activates its 1 minute delay period. This is to prevent the heat exchanger
from losing its heat too quickly in the event of a hot water demand. Then
the pump starts and after 30 seconds the gradient control becomes
active. The starting point of the gradient control is the currently existing
ow temperature. A Delta-T control (25K) ensures a stable control
according to heat request.
If the ow temperature is below the T-set value of 20°C the boiler will
immediately start.
If during a demand from the heating the burner switches o, because the
desired ow temperature is exceeded, there will be an anti-cycle time in
operation for 5 minutes. This means that the burner switches on again
after 5 minutes if there is still a demand from the heating.
The ATAG iC is equipped with boiler sensors of 10kOhm. The resistance
value and corresponding temperature are shown in the accompanying
table.
Resistance table table 12.a
NTC1k (25°C) NTC10k (25°C)
Temperature Resistance Temperature Resistance
[°C] [Ohm] [°C] [Ohm]
-10 4.574 -10 55.047
-9 4.358 0 32.555
-8 4.152 10 19.873
-7 3.958 12 18.069
-6 3.774 14 16.447
-5 3.600 16 14.988
-4 3.435 18 13.674
Resistance table sensors ATAG iC-, iS- and iR-series
Outside sensor T4 Flow sensor T1
Return sensor T2
DHW sensor T3
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