Technical data

Vitodens 200-W B2HA 19, 28, 35 Service

5683 702 - 07

External Extensions AM1 (accessory)

Legend

A1 Circulation pump

A2 Circulation pump

fÖ Power supply

40A A Power supply for additional

accessories

aVG KM BUS

Functions

One of the following circulation pumps can be connected

to each of the connections A1 and A2:

- Heating circuit pump for the heating circuit without

mixing valve

- Circulation pump for DHW tank heating

- DHW recirculation pump

Function assignment

Function Code (“General” group)

Output A1 Output A2

DHW recirculation pump

Heating circuit pump 20

Circulation pump for DHW

tank heating 21

33:0

33:1(delivered

condition)

33:2

34:0(delivered

condition)

34:1

34:2

Select the output functions by means of the codes on

the boiler control unit.

Refer to main wiring diagram on page 88.

Troubleshooting