The DHW control macro supports the following overrides:
Table 14. Overrides
Override |
Priority |
Action |
States |
Comment |
Extended operation switch |
1 (highest) |
connect the input "DayExtension" |
0 = auto 1 = extended operation |
DHW control on during extended operation setpoint = DEX-01 |
Legionella |
2 |
connect "LegionellEnable" to a time schedule or override the input with your own program code. |
0 = Off 1 = legionella function |
DHW control on during legionella function setpoint = LEG-01 |
Holiday switch |
3 |
connect the input "HolidaySwitch" |
0 = auto, 1 = holiday |
DHW control off during holiday |
Time schedule |
4 (lowest) |
connect and configure a time schedule or a datapoint to the input "DHW_TempSp" |
higher value during occupied- and lower value for un-occupied periods |
configure the datapoint as a setpoint, to avoid manual alarm, when you change the values. |
Holiday Switch
When the holiday overrides are active, the DHW control will be switched off.
Extended Operation Button
When the extended operation button "DayExtension" is pushed during un-occupied periods or holidays, the extended operation is activated.
The extended operation resets the anti-legionella function. No legionella alarm will be generated in this case. The extended operation button is locked when the DHW temperature setpoint of the time schedule is greater than the parameter SYS-01.
In manual occupied operation, the DHW temperature setpoint is defined by the parameter DEX-01. This manual override time will last for the time period DEX-02.
This timer will be reset as soon as the DHW temperature setpoint of the time schedule switches to occupied. After this period has elapsed, the DHW will return to the automatic mode again.
If the parameter DEX-02 is set to the value of zero, the function will be active only as long as the extended operation button contact is closed.
A possible usage scenario with the setting equal to zero is to use an external flush-mounted timer.
Table 15. Parameter List
Description |
Value Range |
Default Value |
Unit |
DEX-01: DHW setpoint extended operation |
0...80 |
58 |
°C |
DEX-02: auto reset time from extended operation |
0...480 |
60 |
min |
SYS-01: heat demand transmission 0 = no transmission 1 = transmission during circulation pump operation only 2 = always during occupied periods, extended operation, and legionella function |
0...2 |
2 |
- |