Inputs and Outputs

Fig. 9.   Macro Icon with Inputs and Outputs


Table 19.   Inputs

Inputs

Description

Connection Signal Name

SecSupTemp

secondary flow temperature


DHW_TempSp

domestic hot water setpoint


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


LegionellaEnable

enables the legionella function

XXX

CircPumpDemand

start DHW control and circulation pump


MaxThermostat

maximum temperature


DayExtension

extended operation


HolidaySwitch

holiday switch

0 = auto

1 = holiday


SecMinPressSw

secondary minimum pressure switch


Reset

reset alarms

XXX

Table 20.   Outputs

Outputs

Description

Connection Signal Name

PriPumpCmd

primary pump command


ValveControl

DHW valve control output


CircPumpCmd

circulation pump command


CalcDHWTempSp

calculated domestic hot water setpoint


CalcRWTempSp

calculated return temperature setpoint


CalcDemandOut

calculated heat demand


RefillValveCmd

refill valve command


LegionellaActive

legionella function is active


DHW_Failure

DHW temperature failed alarm


DHWS_Leg_Alm

legionella protection failed alarm


OperationMode

contains diagnostic information



Table 21.   Operation modes

DISP-02 OperationMode

Operation mode

Comment

1

unoccupied period

DHW_TempSp < SYS-01

2

occupied period - normal operation

DHW_TempSp >= SYS-01

3

primary supply temp limitation active (has the minimum signal)

primary supply temperature limitation control has the minimum signal

4

primary return temp limitation active (has the minimum signal)

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



8



9

system supply temperature setpoint failed

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

10

legionella protection function active

input “LegionellaActive” is active increases the return temperature setpoint

11

legionella protection function failed

secondary supply or circulation temperature sensors didn't reach the anti-legionella setpoint, within the time to reach legionella setpoint LEG-02

12

maximum temperature limitation by max. thermostat

alarm at the input “MaxThermostat”

13



14

maximum refill time exceeded

refill failed after a minimum pressure alarm (6)