Hydraulics installation
26 Installation instructions geoTHERM 0020051574_04
5
5.2 Installing the mixed circuit with buffer tank
5.2.1 Description of functions for the heating
mode with mixed circuit and buffer tank
The heating circuits are connected as a separating tank to
the heat pump via a buffer tank and are operated using an
external heating circuit pump via a heating circuit mixer.
By default, this is controlled by a flow temperature setpoint
control (¬Ch.9.4.3) .
The VF2 flow temperature sensor sits behind the external
heating circuit pump (underfloor protective circuit).
The heat pump responds to a demand for heat from the
buffer tank.
5.2.2 Installation instructions
> Install the hydraulic components in accordance with the
local requirements and as shown in the sample hydraulic
scheme below.
> If you do not use the optional accessory heat pump brine
filling unit for heat pumps (56) (¬Fig.5.3) install the
individual hydraulic components accordingly (¬Fig.5.9).
> Connect a limit thermostat to ensure the underfloor
heating function on the heat pump.
> Connect the VF2 flow temperature sensor to ensure the
integral energy function.
> When starting up the unit, set Hydraulic Scheme No 2 in
the controller.
The following only applies when installing the optional
external passive cooling:
b
Caution!
Risk of malfunction in cooling mode.
The buffer tank must not be in operation
during the cooling mode of the heat pump.
> Install a motor-driven 3-way diverter
valve in both the flow and return so that
the buffer tank is avoided in cooling
mode.
Caution: Schematic only!
These examples of hydraulic schemes do not contain all of
the shut-off and safety instruments that are required for
correct installation.
> Observe the applicable standards and regulations.
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