Atag IS 12 User Manual

Installation & Servicing instructions ATAG iS-Range
37
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 display.
The boiler is equipped with self-managing control system. This control system takes over a large part of the
manual settings, which simplies 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 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 (See chapter 11 ‘Filling and bleeding boiler and installation’).
CH controls
With a demand from the heating controls, 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 iS 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
Flue sensor T5
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
63
8
3 89
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

Atag IS 12 Specifications

General

Brand	Atag
Model	IS 12
Category	Boiler
Language	English