9 Buffer tank
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 temperature (=recirculation sensor) is
connected and the recirculation temperature is suf-
ficient (see
Temperature- and time-controlled recir-
culation
), 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.
9 Buffer tank
(optional additional function)
1 Buffer cylinder temperature top
2 Temperature of the energy source
3 Buffer cylinder temperature bottom
4 Info line: Heating request (Yes/No) to the
energy source.
5 Buffer tank settings
Button is only visible when
Time switch
is selected as the
buffer tank operating mode; may be adjusted by qualified
personnel only.
6 Buffer tank status line
Set buffer cylinder temperatures
Min. buffer cylinder temperature top
When
Buffer cylinder temperature top
falls below this
value, the energy source for the buffer tank starts
(e.g. heat pump) and the buffer tank is re-charged
(upon time release).
Max. buffer cylinder temperature bottom
The buffer tank is charged until the
Buffer cylinder
temperature bottom
has reached this value.
26
Operation manual
vampair
