23
Enable HS 2 (HTG)
Heating operation with HS2 enabled
You can only select this setting with HP type 1
and 3, if the sensor HS 2 has been connected.
The parameter HS 2 is not available for HP
type 2.
The HS 2 in heating operation will only be
controlled via the return sensor. This means
that the HS 2 (DHC stage) is started, subject
to load, below the dual mode temperature
(parameter 25 DUAL MODE HTG).
Setting HS 2 BGC:
The HS 2 is directly connected into the he-
ating circuit. This can take the form of direct
interconnection into the buffer cylinder with
an electric immersion heater or an intercon-
nection in the heating flow with a modulating
boiler. The HS 2 sensor must be connected to
the heating flow of HS 2. HS 2 starts, subject
to load, below the dual mode temperature
(parameter 25 DUAL MODE HTG) as final
state in the cascade. HS 2 controls the tempe-
rature to the calculated the return tempera-
ture + heating curve gap (parameter 27 HTG
CURVE GAP). HS 2 will only shut down if this
temperature has been reached. This means
that, even if this heat pump is already switched
OFF, and the set temperature for HS 2 has
not been reached, it may be operating on its
own.
Start-up conditions for HS 2 are:
– The actual temperature is below the
dual mode temperature
– The heat pump operates with all stages
– The actual SH 2 temperature is < set
return temperature
Setting HS 2 boiler:
You cannot control heating circuit 2 (mixer
circuit) with this setting. The mixer is used for
HS 2. Connect the HS 2 sensor to the boiler
and the mixer sensor to the heating flow. HS
2 starts, subject to load, below the dual mode
temperature (parameter 25 DUAL MODE
HTG) as final state in the cascade.
The mixer is closed in heat pump operation.
After HS 2 has started, the mixer regulates to
the set mixer temperature, provided:
the temperature of HS 2 > the calculated set
mixer temperature, and the actual mixer tem-
perature < 1 K of the set mixer temperature.
HS 2 shuts down when it reaches the max. set
boiler temperature (parameter 28 SET BOI-
LER TEMP.). It can operate on its own, if the
heat pump is already OFF and the set tempe-
rature for HS 2 has not yet been reached
Start-up conditions for HS 2 are:
– The actual temperature is below the
dual mode temperature
– The heat pump operates with all stages
– The actual temperature must be – 5 K
below the set boiler temperature
24
HEAT LIMIT
Operational heat pump limit
The heat pump is switched OFF if the outside
temperature falls below the selected lower
limit for heating (parameter 24 HEAT LIMIT).
Heat source 2 provides central heating on its
own.
25
DUAL MODE HEAT
The dual mode temperature of the heat
pump for heating operation
Below this outside temperature, HS 2 will be
started to provide heating subject to load (see
also parameter 23 ON TIME HS 2).
26
OFF TIME HS 2
You can only adjust this parameter, if parame-
ter 23 (ON TIME HS 2) has been set to ON.
Since the heat pump cannot meet a heating
demand during times, when the electricity
supplier shuts down his supply, it is advisable
to define the characteristics of HS 2 for this
time. If set to OFF, HS 2 will always take over
the heating function during ESC off periods
(even above the dual mode temperature).
Enter the corresponding time in hours if HS 2
should be disabled for heating during the ESC
off period.
27
HTG CURVE GAP
Heating curve gap
You can only adjust this parameter, if parame-
ter 23 (ON TIME HS 2) has been set to ON.
See parameter 23 ON TIME HS 2;
setting HS 2 BGC and setting HS 2 boiler.
28
SET BOILER T
You can only adjust this parameter, if parame-
ter 23 (ON TIME HS 2) has been set to ON.
See parameter 23 ON TIME HS 2; setting HS
2 boiler
29
ON T HS2 DHW
DHW operation with ON TIME HS 2
You can only select this setting with HP type
1 and 3.
The parameter HS 2 DHW is not available for
HP type 2. The HS 2 in DHW operation will
only be controlled via the DHW sensor. This
means that the HS 2 (DHC stage) is started
below the dual mode temperature (parame-
ter 31 DUAL MODE DHW).
To control the second heat source in case of
DHW demand, the setting „supported“ of the
DHW circulation pump output is switched.
For this, HS 2 supports the heat pump during
DHW loading below the dual mode point
(parameter 31 DUAL MODE DHW).
With setting „independent“, only HS 2 will
provide DHW, i.e. independent of the dual
mode point. In case of DHW demand, the
DHW circulation pump outputs and DHW
pump are switched to control HS 2.
Set parameter 35 DHW STAGES
to „0“, as soon as this setting has
been selected, as the heat pump no longer
provides DHW loading.
With setting „alone“, only HS 2 will provide
DHW below the dual mode point.
In case of DHW demand, this setting switches
the DHW circulation pump output to control
HS 2.
30
DHW LIMIT
Operational heat pump limit
The heat pump is switched OFF if the outside
temperature falls below the selected lower
limit for DHW (parameter DHW LIMIT).
Heat source 2 provides DHW on its own.
31
DUAL MODE DHW
The dual mode temperature of the heat
pump for DHW operation
See ON T HS2DHW
Below this outside temperature, HS 2 will be
started to provide DHW subject to load (see
also parameter 29 ON T HS 2DHW).
32
DHW OPERATION
DHW operation
This setting is hidden for HP type 2 with con-
nected source sensor (WPF).
Parameter 32 DHW OPERATION enables
three different setting options. These are prio-
rity, parallel and part priority operation.
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