6 Heating circuit
Release mode
1
Always off
: The recirculation control is switched off
permanently.
Always on
: The recirculation control is switched on per-
manently. The recirculation pump is only triggered in
consideration of the parameters
Switch-on duration
and
Hold-on time
.
Time switching (
Monday-Sunday, in blocks,
...): In this
respect, time releases can be set for recirculation con-
trol.
Switch-on duration / Hold-on time
2
Depending on the recirculation control selected, the
pump is cycled in consideration of these two para-
meters, i.e. alternation between
Switch-on duration
and
Hold-on time
.
Recirculation required temperature
4
Is the required temperature in the recirculation line
(only displayed when a recirculation sensor is connec-
ted).
8.2 Recirculation control - Options
i
In order to be able to make use of the following
controls, time switching (
Monday-Sunday, in
blocks,
etc.) must be selected for the para-
meter
release type
.
Time-controlled recirculation
In the event of time-controlled recirculation, the recir-
culation pumps are triggered on a cycled basis if a time
release (see parameter
release type
1) is present.
Cycling (i.e. switching between control/no control) is
conducted in accordance with the
Switch-on duration
and
Hold-on time
parameters.
Example:
- Release type =
Monday-Sunday,
- The recirculation control currently has, for example, a
time release of 06:00 to 08:00
- Switch-on duration = 30 seconds
- Hold-on time = 4 minutes
The recirculation pump runs for 30 seconds. After this,
the pump pauses for 4 minutes in order to then run for
30 seconds again. This repeats in a time release from
06:00 to 08:00. Outside the time release, the pump is
not triggered.
Temperature- and time-controlled recir-
culation
Temperature-controlled recirculation is only available if
a temperature sensor is connected for the recirculation
temperature. The control takes the recirculation
temperature (
required recirculation temperature
) into
account within the time release. This means that the
pump is only cycled if the recirculation temperature is
below the
required recirculation temperature
of minus
5°C.
Example:
- Release type =
Monday-Sunday
- The recirculation control currently has, for example, a
time release of 06:00 to 08:00
- Switch-on duration = 30 seconds
- Hold-on time = 4 minutes
- Required recirculation temperature = 50°C
- Recirculation temperature = 48°C
The recirculation pump is not triggered as the recir-
culation temperature (48°C) is above the
required recir-
culation temperature
of minus 5°C (50°C minus 5°C =
45°C). If the recirculation temperature goes below
45°C, the recirculation pump is triggered for 30
seconds. After this, the pump pauses for 4 minutes in
order to then run for 30 seconds again. This repeats
until the recirculation temperature reaches the
required
recirculation temperature
. Outside the time release,
the pump is not triggered.
Extension of recirculation by means of a
flow impulse
Recirculation being controlled by a flow impulse
3
is
only possible in fresh water modules
, and is used
as an extension of the control options previously
named.
In order to activate this function, the
Flow Impulse
3
parameter must be set to
on
. When a hot water extrac-
tion point is opened briefly, an electronic sensor
detects the pressure drop in the line. The recirculation
pump is triggered even if there is no time release.
Exception: If a temperature sensor for the recirculation
pump (=recirculation sensor) is connected and the
recirculation temperature us sufficient (see
Tem-
perature- and time-controlled recirculation
), then the
recirculation pump is not triggered.
Exception: If a temperature sensor for the recirculation
pump (=recirculation sensor) is connected and the
recirculation temperature us sufficient (see
Tem-
perature- and time-controlled recirculation
), then the
recirculation pump is not triggered.
24
Operation manual
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