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9
Boiler controls
The Good-state or standard read out
Technical read out
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, until 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 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.
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 or pump program (
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. The display
will show A and the boilers current flow temperature.
On a call for heating 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.
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).
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