External Extensions Am1 - Viessmann VITODENS 222-F Service Instructions Manual

Vitodens 222-F B2TB 19 and 35 Service

External Extensions AM1

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 Pump
A2 Pump
fÖ Power supply
Power supply for additional
40A
accessories
aVG KM BUS
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 90.
Troubleshooting
Code ("General" group)
Output A1 Output A2
33:0 34:0(delivered
condition)
33:1(delivered 34"1
condition)
33:2 34:2
85