Installation & Servicing instructions ATAG A-Series
29
10 Boiler controls
Before the plug is inserted into the wall socket, 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 display.
The boiler is equipped with self-managing control system, the so-called Control
Management System. This control system takes over a large part of the manual settings,
which simplies the start-up on the installation considerably.
After lling the installation the automatic de-aeration program is activated. The automatic
de-aeration program lasts for approx. 7 minutes and stops automatically. Then the boiler
will switch on for the enabled program (CH or HW)(See ‘Filling and bleeding boiler and
installation’).
Hot water controls (combination boilers)
If hot water is tapped the ow sensor measures (F1) the amount tapped. Depending on
the desired tap water temperature and tap volume the controls will calculate a supply
temperature. This realises the desired water temperature in an efcient way. The hot
water sensor (T3) will adjust any minor deviations caused by uctuations in the supply
tap water temperature so that even under these circumstances the desired temperature
is reached.
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 supply
temperature. A Delta-T control (25K) ensures a stable control according
to heat request.
If the supply 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 off, 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.
In case of weather-dependent controls (1kOhm outside sensor ARZ0055U
connected) a daily temperature is set instead of a supply temperature.
Control will take place according to the heating line.
The ATAG A is equipped with boiler sensors of 10kOhm. The resistance
value and corresponding temperature are shown in the accompanying
table.
Resistance table table 10.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
-3 3.279 20 12.488
-2 3.131 22 11.417
-1 2.990 24 10.449
0 2.857 26 9.573
1 2.730 28 8.779
2 2.610 30 8.059
3 2.496 32 7.406
4 2.387 34 6.811
5 2.284 36 6.271
6 2.186 38 5.779
7 2.093 40 5.330
8 2.004 42 4.921
9 1.920 44 4.547
10 1.840 46 4.205
11 1.763 48 3.892
12 1.690 50 3.605
13 1.621 52 3.343
14 1.555 54 3.102
15 1.492 56 2.880
16 1.433 58 2.677
17 1.375 60 2.490
18 1.320 62 2.318
19 1.268 64 2.159
20 1.218 66 2.013
21 1.170 68 1.878
22 1.125 70 1.753
23 1.081 72 1.638
24 1.040 74 1.531
25 1.000 76 1.433
26 962 78 1.341
27 926 80 1.256
28 892 82 1.178
29 858 84 1.105
30 827 86 1.037
35 687 88 974
40 575 90 915
Outside sensor T4 Flow sensor T1
Return sensor T2
DHW sensor T3
Flue sensor T5
Resistance table sensors ATAG A
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General
Weight and Dimensions
