Cetetherm AquaEfficiency
Installation, service and operating instruction
38
11.8 S5 Menu Outdoor Temperature
This sub-menu allows to adjust the heating curve parameters: slope + ambient indoor temperature set point on
a clock program.
NOTE:
To activate this function set parameter
S5 Active Heating
to 1 in the Configuration menu.
When this parameter is activated, it get its influence on S1 setpoint that is modified and variable. It is not
necessary to activate S5 heating in configuration menu in the case of AlfaPilot mode: it should not be activated
if a constant temperature set point is required on S1, like in tap water production.
For more information on AlfaPilot working mode, see
18.12 Add AlfaPilot functionality.
1. Use the wheel and mark the clock logo. Press the wheel.
2. SP_T_Amb_S5 temperature will apply a set point correction of the
heating curve. 20°C in ambient is the reference temperature,
where no correction occurs (see diagram below).
3. The default value for SP_T_Amb_S5 is:
•
20°C between 6h00 (6am) and 22h00 (10pm) and
•
15°C between 22h00 (10pm) and 6h00 (6am) the next day
To change this time program settings see
4. Heat Curve curvature
Do not change the heat curve curvature, it is a factory setting.
5. Heat Curve slope
(see diagram below)
Default value is 1.6 meaning :
With an outdoor temperature at -20°C, the calculated set point will be
≈85°C and with an outdoor temperature at +20°C the calculated set point
will be 20°C.
For example if you want a 90°C calculated set point at -20°C outdoor
temperature, set the parameter
HeatCurve slope
to ≈1.8.
Now if setting an ambient temperature to 15°C, the set point will be
decreased to ≈87°C.
If no outdoor temperature sensor (S5) is in use, Cetetherm strongly
recommend to manually entering a value of 20°C for the S5 sensor.
The S5 value needs to be set for not disturbing the constant temperature
set point on Pt2 sensor (see
The hand logo indicates that the value has been entered manually.
The weather-compensated controller requires a heating curve to determine the correct flow temperature set
point according to outside air temperature. The heating curve graph indicates the relationship between outside
air temperature and associated flow temperature.
