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geoTHERM exclusive VWS 0020051614_00 installation instructions
6.9
Connecting an external boiler
If your external boiler has a Vaillant eBUS interface, you
can connect it to the heat pump eBUS via the VR 32 ac-
cessory (see also the VR 32 manual regarding this).
1x 2P
1 2
1 2
Te
l
BUS
- +
DCF
/A
F
DCF 0 AF
Fig. 6.18 Connecting to a boiler with an eBUS interface
Boilers without eBUS interfaces are connected to the in-
ternal auxiliary heating contact (ZH, see Fig. 6.7) via an
isolating relay (accessory, Vaillant No. 306249).
NN
Au
f
Zu
L
ZH
LP
/UV 1
1
Fig. 6.19 Connecting to a boiler without an eBUS interface
Key to Fig. 6.19
1 Cut-off relay (accessories Nr. 306249)
In both cases, the heat pump switches in the external
boiler depending on the heat demand and the controller
setting. In addition, set the hydraulic connection of one
of the auxiliary heating in the Menu A8.
Electrical installation 6
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