Circulation Temperature Control

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