Operating manual for the auroMATIC 620 Controller 0020094404_006
3 Description of the appliance
3.1 Construction and function
The controller is used for weather-controlled heating
control with hot water generation with additional solar
heating support and solar hot water generation.
The controller can control the following system circuits:
– two solar collector arrays or one solar collector array
and one solid fuel boiler,
– a direct heating circuit,
– a mixing circuit, e.g. for underfloor heating,
– a buffer cylinder and an indirectly-heated domestic
hot water cylinder or a solar combi cylinder,
– one circulation pump,
– one charging pump for heating a swimming pool
(swimming pool controller not integrated in the Vail-
lant system).
To expand the central heating installation, up to six
additional mixing circuit modules (accessory), each with
two mixing circuits, can be connected. That is to say, the
controller can control a maximum of 14 circuits.
To operate them more conveniently, remote control
devices can be connected for the first eight heating cir-
cuits.
Each mixing circuit can, as required, be switched
between:
– Heating circuit (radiator circuit, underfloor circuit,
etc.),
- Fixed value controlling,
- Increase in return flow,
– Hot water circuit (in addition to integrated hot water
circuit).
With the aid of modulating bus couplers (accessory), up
to 8 Vaillant modulating heaters can be connected.
With the aid of a switching bus coupler, a 1 or 2 stage
heater can be connected. The eBus system can be used
to combine up to six heaters to form a cascade. One bus
coupler is required for each heating appliance.
With the remote telephone contact connection (floating
contact input), the operating mode of the controller can
be changed from any location by telephone via the tele-
SWITCH telephone remote control switch.
3 Description of the appliance
