Vaillant sensoCOMFORT VRC 720f Operating And Installation Instructions page 84

4 -- Using the functional modules, basic system diagram, start-up
4.7.4 Heat pump as a single unit (hybrid)
With external back-up boiler
A back-up boiler (with eBUS) is connected via the VR 32 (address 2).
A back-up boiler (without eBUS) is connected to the output for the heat pump or the heat pump control module for the ex-
ternal back-up boiler.
System property
Domestic hot water generation only provided by the back-up boiler without the functional module
–
Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
Domestic hot water generation only provided by the back-up boiler with the functional module
–
Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
Domestic hot water generation through the heat pump and back-up boiler
–
Connecting the domestic hot water cylinder temperature sensor to the FM5 functional module
–
Without the FM5 functional module, connecting the domestic hot water cylinder temperature sensor
to the heat pump control module and/or heat pump
Domestic hot water generation provided by the heat pump and back-up boiler with a bivalent domestic
hot water cylinder
–
Connecting the upper domestic hot water cylinder temperature sensor to a back-up boiler (separate
charge control)
–
Connecting the lower domestic hot water cylinder temperature sensor to the heat pump control
module and/or heat pump
1) E.g. VWZ MWT
4.7.5 Cascade with heat pumps
Maximum seven heat pumps possible
With external back-up boiler
As of the second heat pump, the heat pumps and, if required, the heat pump control modules, are connected via the VR 32
(B) (address 2 to 7).
A back-up boiler (with eBUS) is connected via the VR 32 (next free address).
A back-up boiler (without eBUS) is connected to the output for the first heat pump or the heat pump control module for the
external back-up boiler.
System property
Domestic hot water generation provided by the back-up boiler only
–
Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
Domestic hot water generation through the heat pump and back-up boiler
–
Connecting the domestic hot water cylinder temperature sensor to the FM5 functional module
1) E.g. VWZ MWT
82
Operating and installation instructions sensoCOMFORT 0020288151_00
Basic system diagram
code:
Without With heat
1)
heat ex-
exchanger
1)
changer
8 10
9 10
16 16
12 13
Basic system diagram
code:
Without With heat
1)
heat ex-
exchanger
1)
changer
–
9
16 16