External Extension (Accessories); Am1 Extension - Viessmann VITOCROSSAL Service Instructions Manual

Function description

External extension (accessories)

AM1 extension

Fig. 47
A1 Circulation pump
A2 Circulation pump
Power supply
fÖ
Functions
One of the following circulation pumps can be connec-
ted to each of connections A1 and A2:
Heating circuit pump for heating circuit without mixer
■
Circulation pump for cylinder heating
■
■ DHW circulation pump (only for weather-compensa-
ted control units)
Connect DHW circulation pumps with standalone
functions directly to the 230 V
Function assignment
Function
DHW circulation pump sK
Heating circuit pump
sÖ
Circulation pump for cylinder heating
84
∼
supply.
Output A1
33:0
33:1 (delivered condition)
33:2
sA
A Power supply for additional accessories
fÖ
KM-BUS
aVG
Select the output functions via parameter changes/
codes at the boiler control unit.
Parameter/code ("General" group)
Output A2
34:0 (delivered condition)
34:1
34:2