Viessmann Vitodens 333 Service Instructions Manual page 97
Compact gas fired condensing boiler. 4.2 to 19 kw natural gas and lpg version
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Also See for Vitodens 333:
- Service instructions manual (132 pages) ,
- Instruction manual (16 pages) ,
- Technical manual (180 pages)
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Extensions for external connections
External extension H1 (accessories)
The external extension is connected
to the boiler control unit via the KM
BUS. The following functions can be
controlled or processed simulta-
neously via the extension:
A
Mains isolator (on site)
sÖ
Heating circuit pump for the
heating circuit without mixer
sK
DHW circulation pump
fÖ
Power supply
gÖ
Fault notification
Function description
(cont.)
aVD
External blocking
(terminals 2 3)
External demand
(terminals 1 2)
External heating program
changeover (terminal 1 2)
The allocation of function
"External heating program
changeover" is set via coding
address "91".
aVF External set value 0 10 V
aVG KM BUS
97
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