Manual Overrides

The DHW control macro supports the following overrides:

Table 11.   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 "LegionellaEnable" 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. In this case, no legionella alarm will be generated.

The extended operation button is locked when the DHW temperature setpoint of the time schedule is higher than the parameter SYS-01.

During extended operation, the DHW temperature setpoint is defined by the parameter DEX-01.

This manual override time will last for the time period defined by the parameter DEX-02 .

The 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 "0", the function will only be active as long as the extended operation button contact is closed.

A possible usage scenario for setting the parameter DEX-02 equal to "0" is the usage of an external flush-mounted timer.

Table 12.   Parameter List

Description

Range

Default

Units

DEX-01: DHW setpoint extended operation

0...80

60

°C

DEX-02: auto reset time from extended operation

0...480

60

min

SYS-01: occupied/ un-occupied changeover; 0 = disable

0...50

40

°C