Vaillant VRC 630, Operating Manual

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3 Description of the device
3.1 Construction and function
The controller is used for weather-controlled heating
control with hot water generation.
The controller can control the following system circuits:
one DHW cylinder,
a maximum of two modulating boilers without eBUS
or
one modulating boiler with eBUS
or alternatively one 2-stage boiler,
two controlled circuits and
one uncontrolled circuit
To expand the central heating installation, up to six
additional mixer circuit modules (accessory), each with
two mixer circuits, can be connected. This means: the
controller can control a maximum of 15 circuits.
To operate them more conveniently, remote control
devices can be connected for the first eight heating cir-
cuits.
Each mixer circuit can, as required, be switched
between:
Heating circuit (radiator circuit, underfloor circuit,
etc.)
Fixed value control
Increase in return flow,
Hot water circuit (in addition to the integrated hot
water circuit).
Several modulating Vaillant boilers or one and two-
stage heating appliances can be connected using modu-
lating bus couplers (accessory).
The maximum number of boilers/heaters that can be
connected depends on the bus coupler installed.
Bus coupler Maximum number of boilers/heaters
that can be connected
VR 30, VR 32 8
VR 31 6
Table 3.1 Maximum number of boilers/heaters that can be
connected
With the remote telephone contact connection (poten-
tial-free contact input), the operating mode of the con-
troller can be changed from any location by telephone
via the teleSWITCH telephone remote control switch.
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3 Description of the device
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Operating manual VRC 630 0020095108_00