Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 171

Control unit settings by the contractor
The following pages only describe those
parameters that can only be adjusted by
specialists operating in the service menu
at "Coding level 1".
Customer level parameters that are
described in the operating instructions
are not explained here.
!
Please note
Incorrect operation at "Coding
level 1" can result in damage to
the appliance and heating sys-
tem.
Always observe the installation
instructions; failure to observe
these will void your warranty
rights.
Activating service menu
The service menu can be activated from
any menu.
Disabling the service menu
The service menu remains active until it
is deactivated with "Terminate serv-
ice?", or if no operation takes place for
30 minutes.
Setting parameters, using the example "System scheme"
To set a parameter, first select the
parameter group and then the parame-
ters.
All parameters are displayed as plain
text. A parameter code is also assigned
to each parameter.
Control unit settings by the contractor
Note
The available parameters depend on the
individual system configuration (e.g.
parameters for heating circuit M2: dis-
play only if heating circuit M2 is config-
ured).
Press OK + å simultaneously for
approx. 4 s.
Service menu:
1. Press OK + å simultaneously for
approx. 4 s.
2. Select "Coding level 1".
3. Select parameter group: "System
definition"
4. Select parameter: "System scheme
7000"
5. Adjust system scheme: "2"
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