Operation Mode

The operation mode provides useful information for easy testing and debugging of the domestic hot water.

This information is available via parameter DISP-02 or the macro output "OperationMode".

The output operation mode should be connected to a multi-stage datapoint with the states as shown in the next table.

Since BACnet multi-stage points do not support the value "0", the operation mode value range starts with "1".

Table 10.   Operation Modes

DISP-02 OperationMode

Operation Mode

Comments

1

unoccupied period

“DHW_TempSp” < SYS-01

2

occupied period - normal operation

“DHW_TempSp” >= SYS-01

3



4



5



6

cooling down protection active

“SysSupplyTemp” < “UpperTemp” + SST-01

7

DHWS priority request active

DHW temperature control active and

“SysSupplyTemp” < “UpperTemp”  + SST-01 and

“UpperTemp” < “CalcDHWTempSp” - SYS-04

8

heat override function

Input “OverheatProt” = 1 and SYS-02 <>0

9

system supply temperature setpoint failed

“SysSupplyTemp” < “CalcDHWTempSp” in the time SST-02 since control start

10

legionella protection function active

This function is activated if all the conditions are true:

- DHW is in un-occupied mode

- there is no extended operation

- input "LegionellaEnable" switches to "1".

11

legionella protection function failed

One of the DHW sensors (upper or lower) < LEG-01– UWT-01 after LEG-03 since legionella start

12

maximum temperature limitation by max. thermostat

alarm at the input “MaxThermostat”