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2.3.4 Connection of the boiler
2.3.4.1 Light oil/gas boilers equipped with one or two stage burners.
From menu
„OTHER” -> „Kotel Type”
is to be selected
„gas/liquid fuel”
(the option
is default). The burner is to be connected to terminal X17 and X11 (figure 6). By means of
terminal X17(L) a phase is provided to the burner, protected by fuse F3 – 5A. By means of
terminals Х17(N) and Х17(PE) are to be provided respectively a neutral and a protection
earth. Between terminals X11(1S) is placed a switching contact starting 1
st
burner stage, as
between terminals X11(2S) is placed a switching contact starting the 2
nd
burner stage.
2.3.4.2 Solid fuel boilers
The electrical managed solid fuel boilers are designed for a connection of a room
thermostat or a timer, as there are terminals for a contact thermostat (placed in the boiler
terminal box), connected in a short circuit by means of an outer electrical bridge. That bridge
is to be removed as the boiler controller is to be connected by means of a cable with the
Controller terminals.
Solid fuel boiler without their own controller
When the boiler is without its own controller, then the boiler operation is managed by
means of fan speed control in relation to the boiler water temperature within the range of 60 -
85 C.
The control of boiler fan is provided by means of relay switching contact for 1
st
stage
of the controller, placed on terminals X11(1S). From menu
„Kotel Type”
is to be selected
„solid fuel 1
”.
The boiler operation in this case has the following characteristics. If the boiler
temperature is lower than 60 С the boiler fan operates constantly and it is managed by means
of the room or outdoor thermostat. During smooth increasing of the boiler temperature above
60 С (for example when the valve is too much open) even the room thermostat sends a start
command in the fan operation occurs forced pauses of 15 seconds which are being increased
together with the boiler temperature increasing, as the operation periods are being decreased.
In case the boiler temperature is being increased up to 85 С the pauses are being widen too
much, as the operation periods do not exceed 5 seconds. If the boiler temperature exceeds
85 С, the fan operation is permanently prohibited, despite of the room thermostat could send
a start command.
In case the boiler temperature is being increased too fast, the fan operation
can be prohibited constantly after exceeding 60 С. It means the point for constant boiler
stopping depends as well on the speed of boiler temperature increasing as if the speed is faster
the boiler can stop completely within boiler temperature of 60 - 85 С. In this way the
Controller prevents the boiler overheating above the emergency boiler temperature and
emergency opening of the mixed valve, caused by the temperature inertial increasing after the
fan stopping.
Solid fuel boiler with their own controller
If the boiler is equipped with its own operation thermostat, the outlet boiler
temperature is being managed by the boiler thermostat, as the controller only starts or stops
the boiler fan in relation to the commands from the room thermostat, outdoor sensor, return
and outlet boiler temperature, as the last one now fulfils only protection stopping function in
case of boiler overheating above the emergency temperature. The boiler control is provided
by relay switching contact for 1
st
Controller stage, placed on terminals X11(1S). From menu
