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Program Description
9 Program Description
9.1 Faults
The heat pump is blocked during faults. In the case of bivalent
systems, the 2nd heat generator undertakes heating and DHW
preparation. In the case of mono energy systems DHW
preparation is stopped. The immersion heater maintains the
minimum permissible return flow temperature.
The heat pump manager displays any faults in plain text and, in
addition, the (ESC) button flashes red. The heat pump is
9.2 Limit Temperature (Bivalence Point)
The external temperature at which the heat pump is just able to
cover the heat consumption is called the limit temperature or
bivalence point. This point marks the transition from heat-pump-
only operation to bivalent operation combined with an immersion
heater or boiler.
The theoretical bivalence point may deviate from the optimal
bivalence point. Particularly during transition periods (cold
nights, warm days), energy consumption can be lowered by
means of a lower bivalence point, in accordance with the wishes
and usage of the user. For this purpose, a limit temperature can
be set on the heat pump manager in the menu "Settings – 2nd
9.3 Utility Block / Heat Pump Operation Block
Temporary disconnection of the heat pump may be required by
utility companies (Energie-Versorgungs-Unternehmen (EVU)) as
a condition for a favourable electricity tariff. The voltage on
terminal X3/A1 is interrupted during a utility block.
In the case of systems without a utility block, the enclosed bridge
must be inserted at the relevant terminal connections.
Set the utility block in the menu "Settings – 2nd heat generator
– Utility block (EVU)".
In the case of bivalent systems, it is possible to react in different
ways to a utility block:
Utility (EVU) 1: Heat pump blocked, the 2nd heat generator is
only enabled in Power stage 3 (see Chap. 9.5 on p. 28).
9.4 Controlling the 2nd heat generator
9.4.1
Control of Immersion Heaters
Supplementary electric heating systems are used in mono
energy systems. These are switched on or off depending on the
heat consumption if the "Mono energy" operating mode is
9.4.2
Constantly Regulated Boiler (Mixer Regulation)
When implementing this type of boiler, the boiler water is always
heated to a set temperature (e.g. 70 °C) when the command is
issued accordingly by the heat pump manager. This temperature
must be set so high that domestic hot water preparation can also
be carried out by the boiler (according to need). Regulation of the
mixer is undertaken by the heat pump manager. If required, it
calls for the boiler and adds more hot water until the desired set
blocked. After rectifying the fault, the heat pump can be restarted
by pressing the button (ESC). (Switching off the control voltage
also acknowledges an existing fault.)
NOTE
In the case of mono energy systems, by switching to the 2nd heat
generator operating mode, the immersion heater can take over heating
and the flange heater can take over DHW preparation.
heat generator – Limit value" to enable the 2nd heat
generator.
The limit temperature is normally only used in mono energy
systems with air-to-water heat pumps or bivalent systems in
combination with boilers.
For mono energy operation, a limit temperature of –5 °C
should be aimed for. The limit temperature is calculated from the
heat consumption of the building in relation to the external
temperature and the heat output curve of the heat pump.
If "Operating mode Bivalent-alternative" was set in the
preconfiguration, the heat pump is blocked if the external
temperature is lower than the set limit temperature.
Utility (EVU) 2: Heat pump blocked, the 2nd heat generator is
enabled if a heating request is pending.
Utility (EVU) 3:Heat pump blocked, the 2nd heat generator is
enabled below the adjustable Limit temperature utility 3.
In mono energy and monovalent systems, the 2nd heat
generator is normally blocked during a utility block. The setting
for the utility block is hidden.
NOTE
For an external block of heat pump operation which does not
automatically reset after a maximum of 2 hours, the external disable
contactor (contact X3/A2) should be used. If the minimum permissible
return flow temperature is undershot, the heat pump is enabled even
when a blocking signal is applied.
selected in the preconfiguration menu and the set limit
temperature (see Chap. 9.2 on p. 27) is undershot.
return flow temperature or hot water temperature is reached. The
boiler is called via the 2nd heat generator output of the heat
pump manager, and the mode of operation of the 2nd heat
generator is coded as being "constant".
9.4
EN-27
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