33
Meas. 3 and 4
Outdoor temp.
Hybrid heating
Device settings -> Hybrid heating
Factory
setting
Information about the setting:
Setting:
Not in use
In use
Not in use
Hybrid heating
The extent of temperature difference between the accu-
mulator and the charging circuit (e.g. solar collector) at
which valve is driven 100 % open.
Select whether to use a 0-10 or 2-10V voltage-controlled actuator in the charging circuit.
If hybrid heating is taken into use, the controller automatically reserves measurement chan-
nels 4 and 5 to hybrid heating temperature measurements (meas. 4 for accumulator tempe-
rature, meas. 5 for solar collector temperature). The function requires that either EXU-800
extension unit or EXP-800 expansion package has been connected to the controller.
Charging circuit
valve min position
Temp. difference
where pump starts
Temp. difference
where pump stops
Cooling
Cooling starts when
accumulator temp. is
Outdoor. temp
limit for cooling
Cooling stops when
accumulator temp. is
Temp. difference
where valve is 100%
Actuator selection
10 %
10 °C
2°C
Not in use
95 °C
12 °C
80 °C
20 °C
0-10 V
0...100 %
0...20 °C
0...20 °C
Not in use,
In use
0 ... 100 °C
0 ... 50 °C
0 ... 100 °C
0...100 °C
0-10V or 2-10V
The position of the valve is determined by the extent of the
temp. difference between the accumulator and the charging
circuit. If the temp. difference is small, the valve is driven to-
wards ‘Closed’ position, and thus the flow gets weaker and
the temp. difference gets bigger. This setting determines the
minimum valve position when the pump is running.
The charge pump is relay-controlled. The pump starts
when the temperature difference between the accumu-
lator and the charging circuit equals this setting.
The pump stops when the temperature difference between the accumulator and the char-
ging circuit equals this setting.
As a factory setting, cooling is not in use. It is recommendable to use the cooling function if
there is a risk of the accumulator overheating. Overheating may take place if, for example,
the accumulator is small and the solar collectors produce too much heat.
Charge pump starts and the valve is driven 100% open when the accumulator temperature
rises to equal this setting. In addition, the charging circuit temperature must be at least the
extent of “Temp. difference where pump starts” below the accumulator temperature. Mo-
reover, outdoor temperature mustn’t be below “Outdoor. temp limit for cooling”.
The outdoor temperature limit below which cooling function is blocked.
Cooling stops when the accumulator temp. drops enough to equal this setting. Or when the temp. dif-
ference between the accumulator and the charging circuit shrinks enough to equal the setting “Temp.
difference where pump stops”. This is when the charge pump stops and the valve is driven closed.
Min %
100 %
Valve %
Temp. difference °C
Charge
pump
stops
Charge
pump
starts
Max
charging
Cooling function
Charging control
33
Setting
range
