Inputs and Outputs

Fig. 13.   Macro Icon with Inputs and Outputs

Table 16.   Inputs

Inputs

Description

Connection Signal Name

SecSupTemp

secondary supply temperature temp.


HeatDemand

heat demand input

XXX

PriSupTemp

primary supply temperature


PriSupTempSp

primary supply temperature setpoint set to 58 °C to avoid calcification


PriRetTemp

primary return temperature


PriRetTempSp

primary return temperature setpoint


DistrHtgSupTemp

district heating supply temperature


FilteredOATemp

filtered outside air temperature

XXX

LegionellaActive

legionella function is active


MaxThermostat

maximum temperature


SafetyTherm

safety thermostat


SecPmpStatAlm

pump status or common alarm input


SecMinPressSw

secondary minimum pressure switch


Reset

reset

XXX

Table 17.   Outputs

Outputs

Description

Connection Signal Name

PriPumpCmd

primary pump command


ValveControl

DHW valve control output


SecPumpCmd

secondary pump command


CalcSSTempSp

calculated secondary supply setpoint


CalcRWTempSp

calculated return temperature setpoint


RefillValveCmd

refill valve command


HE-Failure

heat exchanger temperature failed alarm


OperationMode

contains diagnostic information



Table 18.   Operation modes

DISP-02 OperationMode

Operation mode

Comment

1

heat exchanger has no demand

there is no external heat demand

2

secondary supply temperature control active

normal operation

3

primary supply temp limitation active

primary supply temperature limitation control has the minimum signal

4

primary return temp limitation active

primary return temperature limitation control has the minimum signal

5

periodic valve opening during limitation control

Open the valve to avoid measuring standing water during limitation control, if the valve control signal = 0%.

6

minimum pressure switch alarm

alarm at the input “SecMinPressSw”

7

outside air temp frost protection

If the secondary supply temperature becomes less than the value of parameter SST-02 (switching differential 2 K) and the outside air temperature is less than the frost protection limit OAT-01 (switching differential 1 K), then the SST control will be released. In this case, the setpoint will be the value of the parameter SST-02.

8

pump alarm

secondary pump alarm at the input ”SecPmpStatAlm”

9

system supply temperature setpoint failed

“SecSupTemp” < “CalcSSTempSp” –SST-06 for more than 600 sec after control start.

10

legionella protection function active

input “LegionellaActive” is active and increases the return temperature setpoint

11



12

maximum temperature limitation by max. thermostat

alarm at the input “MaxThermostat”

13

maximum temperature limitation by safety thermostat

alarm at the input “SafetyTherm”

14

maximum refill time exceeded

refill failed after a minimum pressure alarm (6)