Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 33
Air-to-water heat pumps 2.4.3
2.4.3 Hydraulic integration
Split heat pumps can be used either in mono energy mode or as
a bivalent system for heating a building. In contrast to air-to-
water pumps for outdoor installation, the buffer tank for split heat
pumps can also be integrated in the heating return, as these
pumps already have pre-installed pipe heating for defrosting in
the indoor unit. A minimum flow rate of 30 l/min is required to op-
erate the heat pump safely. The flow can be controlled via the
heat circulating pump integrated in the indoor unit. The flow rate
for the circulating pump can be found in the following diagram.
Fig. 2.39: Flow rate
Mono energy mode of operation
The split heat pump can be used for heating and domestic hot
water preparation. The heat pump is regulated according to the
outside temperature via an outside temperature sensor. If the
output of the heat pump is no longer sufficient, the controller ac-
tivates the pipe heater integrated in the indoor unit. The switch
between domestic hot water preparation and heating takes place
via a three-way reversing valve. A sample hydraulics for mono
energy split heat pump operation can be found in Chapt. 8.15.11
on page 129.
Bivalent operating mode
For split heat pumps combined with an existing boiler, the boiler
is still controlled by the existing boiler controller. The maximum
flow temperature of the split heat pump is also restricted to 60 °C
via an additional thermostat.
In bivalent-alternative operation, the heat pump is switched off by
the additional thermostat if a specific temperature is exceeded.
The bivalence point of the heat pump must be set to -15 °C to
prevent the installed pipe heater from switching on. The heating
curve of the heat pump must also be set so that there is a higher
set temperature above the bivalence point than with the boiler
controller. A sample hydraulics for bivalent split heat pump oper-
ation can be found in Chapt. 8.15 on page 113.
NOTE
Domestic hot water preparation via the heat pump is not possible with
this integration.
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