The macro calculates the pre-control heating setpoint in two steps.
The heating setpoint is calculated by the use of a heating curve as result of the measured outdoor temperature and a virtual room temperature setpoint.
In the first step, a room temperature setpoint is calculated depending on the maximum valve position input “MaxHtgVlvPos” of the connected room controllers or the thermal load input “TherminalLoad”.
If the heating output signal is between 20% and 80%, then the pre-control room setpoint will be the room temperature setpoint for mid demand RMSP-02 (20 °C).
Between 80 - 100 %, the room setpoint will be increased to the maximum room temperature setpoint RMSP-03 (23 °C). Below 20%, the room setpoint will be decreased to the minimum room temperature setpoint RMSP-01 (17°C), see next figure.
Fig. 3. Room temperature setpoint as function of the maximum valve position or thermal load
Conditions:
If the maximum heating valve position input “MaxHtgVlvPos” or the thermal load input “TherminalLoad” (1 in next picture) is greater than 80% and increasing to 100%, the room setpoint will increase up to the maximum room setpoint (RMSP-03).
If the maximum heating valve position input “MaxHtgVlvPos” or the thermal load input “TherminalLoad”is less than 20% and decreasing to 0%, the room setpoint will decrease to the minimum room setpoint (RMSP-01).
To allow
the calculated room temperature setpoint is the maximum value between the
Set this room setpoint to different values or assign it to a time program.
The output of the heating curve is the pre-control flow temperature setpoint (3 in next picture), limited by a maximum value as defined by the parameter FLT-01.
Refer to the next picture where the heating setpoint calculation is shown.
Fig. 4. Heating pre-control schematic
The two temperature setpoints are available as display values:
The room temperature setpoint values for low, mid and high demands can be changed with the following parameters.
Table 3. Room Temperature Setpoint Values for Low, Mid and High Demands Parameter List
Description |
Value Range |
Default Value |
Unit |
RMSP-01: room temperature setpoint for low demand |
0 ... 50 |
17 |
°C |
RMSP-02: room temperature setpoint for mid demand |
0 ... 50 |
20 |
°C |
RMSP-03: room temperature setpoint for high demand |
0 ... 50 |
23 |
°C |
Table 4. Heating Curve and Setpoint Limitation Parameter List
Description |
Value Range |
Default Value |
Unit |
FLT-01: maximum flow temperature limit pre-heating |
0 ... 150 |
82 |
°C |
HCA-01: heating curve curvature |
1,0...2,0 |
1,33 |
- |
HCA-02: heating curve slope |
0...4,5 |
1,6 |
- |