18
Graphs of curves
(inclination - change)
The inclinations
The changes
It follows that in this mode the knob on the control panel which is used for setting the temperature of
the heating in fact shows the demanded temperature of the room. We recommend the initial service
setting to be
„K“ = 1.6.
The
user’s setting of the heating temperature knob to point upwards (which
means 0 °C change). After 24 hours of test heating the setting can be changed according to the demands
for heat comfort. The weather compensated regulation will still work and the set temperature will be
maintained constant automatically.
Using this kind of boiler regulation you lower the operational costs and you improve the heat
comfort (the heating elements are heated continuously). It can also be used as a pre-regulation of a
primary heating circuit for zone regulation, mixing valves etc.
It is certain a room thermostat can be used to lower the temperature of the heated room. In this case
we recommend the version without PI regulation (closing then operates on the basis of temperature
differences). The knob for heating temperature setting is to be set to a value a little higher than it is when
a room thermostat is not used.
If the outside temperature sensor is not working the failure is signalled and the boiler works in the
previous mode (without weather compensated regulation).
Mode: Heating DHW tank
Setting: Service button DS1 – OFF, DS2 as above, DS3 – OFF.
The electronic regulation circuits are adapted for DHW tank heating. The boiler starts working when
the tank thermostat closes. The relay of the 3-way valve is activated and the valve changes into the
position for heating DHW. After 8 seconds the pump relay and the ignition automatics relay close as well.
The boiler ignites at the starting output (2 seconds after ignition) and then the output rises to the
maximum so that the outlet temperature is raised to 80
o
C as soon as possible. This temperature is then
maintained by PID regulation. When the tank is heated up, the thermostat opens and the boiler stops
burning. After 10 seconds the pump stops and switches off the 3-way valve relay. The valve changes into
the position for heating. While the valve is changing (about 8 seconds), any ignition demands are ignored.
Only then can the boiler continue heating up the system (if required).
DHW tank heating is prior to the heating of the system if they are required at the same time.
