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7703301 - 01 - 16072018
Important
If the colder storage tank temperature rises to above the legionella
function setpoint -1 K, the legionella function setpoint is
considered as met and the timer starts running. If the storage tank
temperature drops by more than the switching difference +2K
below the required legionella function setpoint, the duration has to
be met again. If no duration has been set, the legionella function is
met immediately when the legionella function setpoint is reached.
Legionella funct circ pump (1647)
On: The circulation pump will be switched on in case of active legionella
function.
Warning
When legionella function is active, there is a risk of scalding at the
draw-off points.
Circulating pump release (1660)
Time program 3/HC3: The circulating pump is released subject to time
program 3 (see prog. no. 540 to 556).
DHW release: The circulating pump is released when DHW heating is
released.
Time program 4/DHW: The circulating pump is released subject to time
program 4.
Time program 5: The circulating pump is released subject to time
program 5.
Circulating pump cycling (1661)
To save energy, the circulation pump is switched on for 10 minutes and off
for 20 minutes within the release time.
Circulation setpoint (1663)
If sensor B39 is placed in the domestic water distribution line, circulation
pump Q4 is switched on as soon as the sensor value falls below the set
value. The pump then runs at a fixed rate for 10 minutes or longer until the
setpoint has been reached again. There is always a fixed difference of 8 K
between the setpoint for the domestic water storage tank and the setpoint
for sensor B39 (program no. 1663). This is intended to ensure that the
circulation setpoint can also be reached and the circulation pump does not
run indefinitely.
Example 1
DHW setpoint: 55 °C (nominal setpoint)
Circulation setpoint: 45 °C
→ The circulation pump switches on if the sensor value falls below 45 °C,
and runs for at least 10 minutes.
Example 2
DHW setpoint: 50 °C (nominal setpoint)
Circulation setpoint: 45 °C
→ The circulation pump switches on if the sensor value falls below 42 °C
(50 °C - 8 °C), and runs for at least 10 minutes.
Optg mode changeover (1680)
Using external switching above the entrance H1 it can be selected into
which operating mode is switched into.
None : The external changeover does not affect the DHW operating
mode.
Off: DHW is switched to the operating mode "Off".
On: DHW is switched to the operating mode "On".
9 Settings
95
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