Atag BC100124, Appliance Technical Manual

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Water pressure sensor
The iC, iC Economiser & iS boilers are supplied with a pressure sensor.
This sensor control has following settings:
Prior to P1627xxxxx the reading are:
0.7 bar: below this pressure the burner is blocked for operation
0.7 to 1.0 bar: boiler output reduced to 80%
1.0 to 3.0 bar: boiler fully functional
3.0 bar: above this pressure the boiler is blocked for operation.
After P1628xxxxx the reading are:
0.5 bar: below this pressure the burner is blocked for operation
0.5 to 0.8 bar: boiler output reduced to 80%
0.8 to 3.0 bar: boiler fully functional
3.0 bar: above this pressure the boiler is blocked for operation.
Flow switch (regular boiler)
In the regular boiler there is no pump inside and because of the low pressure there is
no pressure sensor inside as well. To register if the system pump is working and there is
water in the system there is a flow switch and this flow switch sets the burner free.
If the water pressure drops below 0.8 bar code 118 will appear in the display; The boiler
will stay in operation with a limited output (80%) until the pressure drops below 0.5 bar
where the boiler will then shut down.
This will disappear again the moment the water pressure is higher than 1.1 bar and the
de-aeration program will start (code 105).
This will take approx. 7 minutes and will be followed by the default display (
OK
).
The boiler will switch on immediately to reach the desired pre-heat temperature (approx.
50°C) of the hot water supply (comfort setting).
%
bar
°C
°C
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