External Extensions Am1 (Accessory) - Viessmann VITODENS 200-W Service Instructions Manual

Troubleshooting

External Extensions AM1 (accessory)

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
Legend
A1 Circulation pump
A2 Circulation pump
fÖ Power supply
A Power supply for additional
40A
accessories
aVG KM BUS
82
Vitodens 200-W B2HA 19, 28, 35 Service
Select the output functions by means of the codes on
the boiler control unit.
Function assignment
Function
DHW recirculation pump
28
Heating circuit pump 20
Circulation pump for DHW
tank heating 21
Refer to main wiring diagram on page 88.
Code ("General" group)
Output A1 Output A2
33:0 34:0(delivered
condition)
33:1(delivered 34:1
condition)
33:2 34:2