4.4.8 Set the heating curve of a heating circuit
A flow temperature is calculated using the heating curve of the heating circuit
depending on the outside air temperature and the two adjustable parameters
“flow
temperature at -10°C outside air temperature”
and
“flow
temperature at +10 °C outside air temperature
“.
Example:
The heating curve is defined with 60°C (at -10°C outside air temperature) and 40°C (at
+10°C outside air temperature). If the current outside air temperature is -2°C, the flow
temperature is calculated as 52 °C.
Heating circuits without measuring the room temperature are operated using the
calculated values. The heating curve must be adapted to influence the room
temperature,
⇨ See "Change room temperature (heating circuit without room
temperature sensor)" [page 45]
When using a room temperature sensor (analogue remote control FRA, room console
RBG 3200, room console RBG 3200 Touch, room temperature sensor) it is not
necessary to interfere with the heating curve. Any deviation of the actual room
temperature to the room temperature setpoint is automatically compensated by
increasing/reducing the flow temperature.
When starting up the system it is defined whether the heating circuit is operating as a
“high temperature circuit” or a “low temperature circuit”. The following values are set:
High temperature circuit
▪ Desired flow temperature at -10°C outside air temperature: 60 °C
▪ Desired flow temperature at +10 °C outside air temperature: 40 °C
Low temperature circuit
▪ Desired flow temperature at -10°C outside air temperature: 40 °C
▪ Desired flow temperature at +10 °C outside air temperature: 30 °C
Reduction of flow temperature
Outside of the set heating times (
⇨ See "Change time window" [page 36]
), the setback
mode is active and the calculated flow temperature is reduced by the adjustable value
“Reduction of flow temperature in setback mode”
.
Heating limits
The outside air temperature heat limits are set in the “Temperatures” tab and they
activate/deactivate the heating circuit depending on the outside air temperature or
time period.
Parameter
Effect
Outside air temperature, at which heating
circuit pump switches off in heating mode
(default: 18°C)
If the outside air temperature difference rises
above the set value, the heating circuit is
deactivated. (Pump off, mixing valve closes)
Outside air temperature, at which heating
circuit pump switches off in setback mode
(default: 7°C)
If the outside air temperature in setback mode
(default: 22:00 – 06:00) falls below the set
value, the heating circuit is activated (pump
on, mixing valve regulated as per heating
curve)
90
80
70
60
50
40
30
20
Flowtemperature
-10
External temperature
-15
-5
0
5
10
15 20
Example of
floor heating
Example of
radiators
4
Operating the system
Operate the boiler using the touch display
44
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
