Recirculation Control - Options - SOLARFOCUS ecotopzero Manual

7 DHW heating
Time switching (Monday-Sunday, by block, etc.): In
this respect, time releases can also be set for recir-
culation control.
Switch-on duration / Hold-on time
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
Is the required temperature in the recirculation line
(only displayed when a recirculation sensor is con-
nected).
Flow pulse 4 (only in connection with a fresh
water module)
When the parameter is active, circulation is active
also when a flow impulse is detected.
When a hot water 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.
Example:
- Release type = Monday-Sunday
- No time release has been set. (00:00 to 00:00)
As soon as DHW is drawn, the recirculation pump is
triggered.
Exception: If a temperature sensor for the recir-
culation pump is connected and the recirculation tem-
perature is sufficient, the recirculation pump is not
triggered.
Boiler control with flow pulse is only possible in con-
nection with a fresh water module.
If Always off is selected with the time release, the
recirculation pump is not started and the flow pulse is
ignored.
System parameters 5
The release times for the recirculation pump can be
set on this screen.
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8.2 Recirculation control - options

i
2
Time-controlled recirculation
In the event of time-controlled recirculation, the recir-
culation pumps are triggered on a cyclical basis if a
time release (see parameter release type) is present.
3
Cycling (i.e. switching between control/no control) is
conducted in accordance with the switch-on duration
and waiting 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 recirculation pump is not triggered.
Temperature- and time-controlled recirculation
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. This value is permanently stored and cannot be
changed.
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
required recirculation temperature. Outside the time
release, the pump is not triggered.
To make use of the following controls, time
switching (Monday-Sunday, by block, etc.)
must be selected for the parameter release
type.
Operation manual ecotop-zero, ecotop-light