Baxi MK SYSTEM Installation, User And Service Manual page 57

1 Current Flow temperature setpoint of zone CM070
2 Maximum Flow Temperature setpoint zone
CP000 = 55 °C
3 Heating curve temperature gradient of the zone
CP230
Tab.43
Parameters
Maximum Flow
Temperature setpoint zone
CP000
Heating curve temperature
gradient of the zone
CP230
Curve base temperature
CP210 / CP220
Wished room temperature
setpoint of the zone
CM190
Outdoor temperature
CM210
Current Flow temperature
setpoint of zone
CM070
Fig.49 Heating curve without curve base
CM070
°C
55
34
20
0
0
20
7856310 - v02 - 21122023
Description of the parameters
The flow setpoint temperature for the circuit CM070 is limited by the maximum flow temperature
setpoint for the circuit CP000.
When using a room thermostat, the setpoint retained is the lowest temperature between the flow
setpoint temperature for the circuit CM070 and the maximum flow temperature setpoint for the
circuit CP000.
The steeper the gradient of the heating temperature curve for the circuit CP230, the quicker the
flow setpoint temperature for the circuit CM070 will increase.
Decrease the gradient of the heating temperature curve for the circuit CP230 in case of over­
heating in mid-winter.
Example: for an outdoor temperature CM210 of 0 °C:
if CP230 = 0.7 then CM070 = 34 °C
if CP230 = 1.5 then CM070 = 50 °C
Increase the curve base temperature CP210 / CP220 when the heating is insufficient for mild
outdoor temperatures.
CP210 corresponds to the curve base temperature in comfort mode.
CP220 corresponds to the curve base temperature in reduced mode.
If the curve base temperature CP210 / CP220 is set to 15 °C, then it becomes equal to the Re­
quired room setpoint temperature for the circuit CM190.
Example: if CP210 = 15 °C then CM190 = the room setpoint temperature for the activity/timer
programme.
Calculated setpoint temperature, taken from the timer programming, manual mode or the over­
ride
The outdoor temperature CM210 is affected by the position of the outdoor temperature sensor:
check the sensor is positioned correctly.
The flow setpoint temperature for the circuit CM070 is calculated according to the heating curve
parameters:
Without setting of the curve base temperature (CP210 / CP220 set to 15 °C): CM070 =
(CM190 - CM210) x CP230 + CM190
With setting of the curve base temperature (CP210 / CP220 > 15 °C): CM070 = (CM190 -
CM210) x CP230 + (CP210 or CP220)
Without setting of the curve base temperature (CP210 / CP220 set to
15 °C): an outdoor temperature CM210 of 0 °C will give a flow setpoint
MW-6070163-1
temperature for the circuit CM070 of 34 °C.
If CP210 = 15 °C, then CP210 becomes the required room setpoint
temperature CM190 (in our example CM190 = 20 °C).
CM210
°C
-20
4 Outdoor temperature CM210
5 Curve base temperature CP210 / CP220 = 20 °C
9 Parameters
57