43
P 21
Slope of heating curve
The value in this parameter shows the preset curve for heating of the heating circuit.
The value depends on many factors. The correct value must be found out.
P 22
Ventilator output when making fire
[%]
Setting of desired ventilator output when making fire depending on the type of used fuel.
Recommended values:
-
lignite and hard coal 40 - 50 %
-
wood pellets 20 %
P 23
Minimum boiler temperature
[
o
C]
Setting of minimum boiler temperature. The manufacturer insists on min. 50
o
C boiler temperature. This
minimum boiler temperature is maintained in all regimes.
P 24
Type of requirement (auto/fixed)
Setting of the type of requirement for heating:
By default there is used the auto – value 0 type of requirement. The boiler will heat automatically to
the calculated desired water temperature.
It is possible to use the fixed – value 1 type of requirement. The boiler will heat to the fixedly set
outlet water temperature. The temperature set by the manufacturer is 70
o
C. By keys (+ up, - down) of
QAA 88 device we can increase or reduce the temperature set by the manufacturer by 15
o
C. But
QAA 88 device display shows the current space temperature if the QAA 88 device is as the space unit.
Note: In case of boiler operation to fixed temperature the automatic summer/winter switching –over is
always active. The fixed operation is only suitable in case the boiler is used as the source of heat.
Boiler fixed operation is automatically activated in case of outside sensor fault or its disconnection.
The use of auto type of requirement is recommended by the manufacturer.
Type of requirement RVS - value 2. The boiler will continue in heating to the outlet temperature of
water 70 ° C (i.e. the fixed set temperature) in case of requirement that will come from the superior
control - see. Chap. 5.7.
P 25
Boiler hysteresis
[
o
C]
The boiler outlet temperature (modulation zone) can be exceeded by the value set in this parameter..
P 26
Maximum feeder temperature
[
o
C]
Setting of feeder maximum temperature:
Once this temperature has been reached on the fuel feeder sensor the feeder starts to move fuel at the
accelerated pace (shift 20 s, delay 10 s) until the temperature has dropped below the set value. In
case the feeder temperature has not dropped within 7 minutes (fixedly set software value) the feeder
will shut down.
Manufacturer recommends the value set by him to be retained.
P 27
Boiler heating deficiency
[min.]
If 40 °C boiler temperature hasn’t been reached within the time set in this parameter the fault message
„4“ - boiler extinction followed by boiler shut down will occur.
Note: The boiler display is flickering and the fault number is displayed by parameter P 15.
P 28
QAA position
Setting whether we use AQQ 88 device as the space unit (value 2) or the boiler unit (value 1)
1. boiler unit – it is assumed that the device is positioned directly at the boiler. The current boiler
temperature is displayed on the display and the control is purely equithermal without space
effect. By the keys (arrow + up, - down) we correct the desired current boiler temperature.
2. space unit - the device is positioned in the space (reference room). The current space
temperature is displayed on the display and the control is equithermal with the space effect. By
the keys (arrow + up, - down) we change the desired space temperature in the range ± 3 °C
from the temperature set on line no. 103, 106 and 109. This change applies till the next time
change. The same applies to the attenuation temperature.
Note: If the device is positioned in the space, but we select the Boiler unit setting then instead of space
temperature the boiler temperature will be displayed on the display and the space effect will not be
taken into account. Heating is purely equithermal without space effect.
P 40
Heating circuit off/on
By this parameter we can switch off heating of the heating circuit including the pump of heating circuit
and three-way mixing valve if it is used in the application.
Value 0 – Switched off
Value 1 – Switched on
