The circulation temperature control starts if the input "CircPumpCmd" switches to "1" and stops if this input switches off.
The circulation temperature setpoint can be a:
The output "Calc_CirTempSp" displays the calculated circulation temperature setpoint. The calculated circulation temperature setpoint is the setpoint input increased by the value of the parameter LEG-01 in case that the input "LegionellaActive" has the value "1".
The PID control loop output controls the pump speed between 0...100% depending on the control deviation, the P-band circulation temperature control (CIR-01), the I-time system circulation temperature control (CIR-02) and the D-time system circulation temperature control (CIR-03).
Fig. 1. Circulation Temperature Control
The minimum and maximum pump speed and the pump speed ramp up will be set in the macro "FNB_ModFan".
Table 1. Parameter List
Description |
Value Range |
Default Value |
Unit |
CIR-01: P-band circulation temperature control |
1...500 |
20 |
K |
CIR-02: I-time system circulation temperature control |
0...3600 |
300 |
sec |
CIR-03: D-time system circulation temperature control |
0...1000 |
0 |
sec |
LEG-01: setpoint increase during legionella function |
0...20 |
5 |
K |