Appendix
0020250181_00 geoTHERM Installation and maintenance instructions
49
J.6
Basic hydraulic diagram 0020180635
1
Heat generator
2
Heat pump
3e
Circulation pump
5
Monovalent domestic hot water cylinder
7i
2-zone module
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)
9b
Zone valve
9c
Flow regulator valve
9d
Bypass valve
9h
Filling/draining cock
9j
Tamper-proof capped valve
9k
3-port mixing valve
10c
Non-return valve
12
System control
12a
Remote control unit
12d
Expansion/wiring centre
12g
eBUS bus coupler
12k
Limit thermostat
12m
Outdoor temperature sensor
Using a 2-zone set and the appropriate information in the VRC 700 system control also makes the parallel heating mode
possible for parallel operation of different temperature levels in the heating system with the different heat generators.
For the parallel heating mode, the 2-zone kit (Vaillant accessory) must be installed. The heat pump, the gas-fired boiler and
the required heating circuits are connected to the 2-zone kit. When using a 2-zone kit (Vaillant accessory), the two non-return
flaps are not required.
–
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 the control in the living room.
