Appendix
0020250180_00 geoTHERM Installation and maintenance instructions 47
J.5 Basic hydraulic diagram 0020185684
1 Heat generator
2 Heat pump
3e Circulation pump
5 Monovalent domestic hot water cylinder
8a Expansion relief valve
8b Potable water expansion relief valve
8c Safety group – drinking water connection
8e Heating diaphragm expansion vessel
8f Diaphragm expansion vessel – potable water
9a Single-room temperature control valve (thermo-
static/motorised)
9c Flow regulator valve
9h Filling/draining cock
9j Tamper-proof capped valve
10c Non-return valve
10e Line strainer with magnetite separator
12 System control
12g eBUS bus coupler
12k Limit thermostat
12m Outdoor temperature sensor
DHW Cylinder temperature sensor
Either the heat pump or the gas-fired boiler are active in heating mode. It is not possible to operate the units in parallel.
The domestic hot water is only generated by the gas-fired boiler.
– Connect the underfloor heating circuits directly to the heat pump.
– Connect two limit thermostats to guarantee the underfloor heating protection function for the heat pump and the gas-fired
boiler.
– Ensure that a minimum circulation water volume (40% of the nominal volume flow) is guaranteed.
– Install one of the supplied non-return flaps in the flow of both the heat pump and the gas-fired boiler. The flow direction is
from the product towards the heating installation; the backflow to the product is blocked
– If you have installed a low loss header between the heat pump and the heating installation, the VF2 system sensor in the
flow of the low loss header must be attached to the heating installation.
– Install the control in the living room.
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