Viessmann Vitoligno 300-P Service Instructions For Contractors page 103

Display and control elements
G
F
A Display
B Back key
C Cursor keys of setting values
D Confirmation
Control functions
Heating circuit control
Brief description
■ The control unit comprises two heating
circuits 1 and 2 with mixer M1 and M2.
■ The set flow temperature of every
heating circuit is determined from the
following parameters:
– Outside temp.
– Set room temperature
– Operating mode
– Heating curve slope and level
■ A minimum boiler water temperature
that must be maintained to protect the
boiler is defaulted via the boiler coding
card.
A
Idle state
Boiler
Outside temperature
DHW temp. 50°C
B
55°C
8°C
E Menu setting
F Emissions test switch
G Standby
■ The flow temperature of the heating
circuits 1 and 2 is regulated by the
stepped opening or closing of the mix-
ers.
The mixer motor control changes the
actuating and pause times subject to
the control differential (control devia-
tion).
■ Coding addresses that influence the
heating circuit control:
9F, A0 to FB.
For a description, see codes overview.
Function description
C D
E
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