Heating circuit controller
60
The following entries are found in this submenu “Heat curve”:
HTG CIRC.1
MODE:
CONTROL : Outs.temp.
Control based on outdoor temperature and heating curve
or
Fixed val.
The flow is set in setback mode to the indicated temperature at
+10°C and in standard mode to the one at -20°C.
HEAT CURVE: Temp.
Heating curve via temperature 10°C and -20°C
or
Slope
Heating curve via input of the slope (0.05-2.50)
Room inf.: 0 %
The room temperature is taken into consideration for the calcula-
tion of the flow at xx%, setting range 0 – 90%
The room influence is also active in fixed value mode.
Start
excess: 0 %
The previous switch-off time of the heating circuit pump leads to
a (decreasing over time) excessive increase in flow temperature.
(maximum up to T.flow MAX).
Setting range 0 – 20%
*) for detailed explanation see below
T.flow+10°C: 35 °C
Desired flow temp. at +10°C outdoor temp. (heating curve)
T.flow-20°C: 60 °C
Desired flow temp. at -20°C outdoor temp. (heating curve)
or:
Slope 0.60
Specification of the slope (for selection Heat Curve: Slope)
T.flow MAX: 65 °C
The flow must not exceed this value
T.flow MIN: 20 °C
The flow must not drop below this value
*) Start excess (“Increasing on Start”)
The precise formula for the start excess is:
T.flow SET Start excess = T.flow SET + T.flow SET* (Start excess / 100) * (Meter/ 30)
The meter is increased by 1 every 20 minutes with a
switched-off
heating circuit pump, with a
switched-on
heating circuit pump, it is lowered by 1 every minute down to 0.
The maximum meter value is 255. It is therefore reached after 85 hours switch-off time (= 255/3 hours
or approx. 3.5 days). The maximum run-down time is 4.25 hours (= 255 minutes). The set excessive
increase in % is effective after a switch-off time of 10 hours (= 30 x 20 minutes).
Example
: T.flow SET=40°C, Start excess = 10%, Switch-off time 8 hours
The excess temperature starts at +3.2 K (above the set value) and falls uniformly to zero within 24
minutes.
Protection of heat-sensitive systems parts:
Heat-sensitive systems parts (e.g. plastic ducts) must be equipped with additional protecting devices
(e.g. thermal temperature limit for floor heating) which prevent overheating in the event of failure of
the controller or of another system component.
