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Pressing SET button is to fix the hour and minutes for start and
stop. The values starts blinking as the change could be done by means of
SEL and SCL buttons, as the confirmation of the selected value can be done
by means of SET button. The next step is to select the days during which
the time period is to be active (whole week, working days, weekend). In
case no one day is selected means the time period is not active.
Button SCL is to be pressed in order to move to the second time
period. The setting about it is to be done in the same way. The settings will
be saved in the energy independent memory of the Controller, after pressing
SCL button again. To escape that menu SEL button is to be pressed.
If there is an active time period and the economic mode has been
modified the assignation of the heating water, then in the upper right corner
on the display a down arrow will appear.
The Controller is able to get back from any menu to regular operation status if no one
button is being pressed in 30 seconds time after the last used one.
1.5 Description of the sensors
The sensors are Pt-1000, interchangeable.
1.5.1 Temperature sensor ”K” of the outlet boiler water
The temperature sensor “K” is to be mounted on the outlet boiler pipe as much as
close to the boiler (Figure 1). It is designed to avoid emergency exceeding of the boundary
outlet boiler temperature. If the boiler outlet temperature exceeds the assigned one, the
Controller indicator 7 (Figure 3a) will light, the boiler will stop by force, the mixed valve will
be open and the circulation pumps P1 and P2 will start operation. That will be done despite of
the present working mode and the rest of the regulation parameters meaning. If the outlet
boiler temperature drops bellow the assigned boundary level the Controller automatically will
go into the previous working mode.
The assigned boundary outlet temperature of the boiler is to be fixed in the range of
(+85
0
C) – (+105
0
C). That temperature must be fixed in relation with the boiler type and in
compliance with the settings of the boiler emergency thermostat. For example if the
emergency thermostat is fixed at 100
0
C, the necessary boundary outlet boiler temperature of
the Controller is to be decreased bellow that level and afterwards to test its functions. The
Controller must provide the limitation of the outlet boiler temperature level before the
emergency thermostat stops the boiler.
That protection is very important for wood gasification boilers, in case the mixed
valve is closed (for instance during a night drop) and the boiler is not able to decrease its
capacity.
1.5.2 Temperature sensor of the return boiler water “V”
The temperature sensor “V” is to be mounted on the return boiler pipe as much as
close to the boiler (Figure 1). It is designed to prevent the boiler corrosion in relation to the
low temperature boiler condense. In fact that can be happen during starting of the boiler when
the system is still cold and during the usual boiler operation if it is not provided a minimal
level of the return boiler water temperature.
