Manual Overrides

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

-