6 Heating circuit
Release mode
1
Always off
: The recirculation control is switched off
permanently.
Always on
: The recirculation control is switched on
permanently. The recirculation pump is only triggered
in consideration of the parameters
Switch-on duration
and
Hold-on time
.
Time switching (
Monday-Sunday, in blocks, etc.
): In
this respect, time releases can be set for recirculation
control.
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
.
Required recirculation 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 fol-
lowing controls, time switching (
Monday-Sun-
day, in blocks,
etc.) must be selected for the
parameter
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
) 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 the 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 recircu-
lation 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
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
recirculation temperature
minus 5°C (50°C minus
5°C = 45°C). If the recirculation temperature falls
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
requi-
red 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 DHW extraction
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 recir-
culation pump (=recirculation sensor) is connected
and the recirculation temperature is sufficient (see
Temperature- and time-controlled recirculation
), then
the recirculation pump is not triggered.
Example:
- Release type =
Monday-Sunday
- No time release has been set.
As soon as DHW is drawn, the recirculation pump is
triggered.
26
Operation manual
pelletelegance
