Installation & Servicing Instructions ATAG E-Series
21
9
Boiler controls
The boiler is provided with a fully automatic microprocessor control, called CMS
Control Management System. This system simplifies operation by undertaking all major
control functions. Initially when power to the boiler is switched on it will remain on
standby. There is no indication Led on, untill one of the programme keys is pressed. The
control panel display will show the relevant state. When the installation is empty the
display will show FILL.
The various parameters can be called up in two ways:
The Good-state or standard read out
The first way shows a simple display read out.
The boiler in operation will always show 'Good'. When a message is necessary this will
be shown instead of Good.
Technical read out
The second way is a technical read out. In normal situations the following will be shown:
•
on the left the status in which the boiler is active;
•
on the right the flow temperature;
•
the water pressure in the installation.
When a message (error or blocking code) is necessary this will be shown instead of
the technical read out..
To switch over from the Good-state to the Technical read out (and vice versa):
- Press the STEP-key for 5 sec.
When the system has been filled the automatic venting program starts, when a program has
been selected, by pressing the key for Central Heating, DHW or pump program (
,
of
). The program takes 17 minutes and stops automatically. After this the boiler will
function normally. (See also 'Filling and venting the boiler and installation).
During this 17 minute program, the boiler will not operate for Central Heating or DHW. The
display will show A and the boilers current flow temperature.
On a call for heating or hot water the control system will select the required water control
temperature. This water temperature is called the T-set value. On a call for central heating
the boiler ignites first at low output. The output is then changed slowly to match the load
required. The boiler operates in this way to avoid excessive installation noises and
temperature overshoot. On a call for hot water supply the T-set value of central heating return
water temperature is monitored. Depending on the amount of sanitary water which is
withdrawn from the plate heat exchanger, the central heating return water temperature,
from which the input is adjusted, will vary.
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