Viessmann VITOCAL 300, Installation And Service Instructions Manual

Page: 78 / 160

The system can be checked using this
menu. For example, in case of a fault,
you can check whether the cause has
been removed. This check can only
be carried out with the relay switched
OFF.
In standard mode, all monitoring
inputs are "
OFF ". In case of a fault,
they change into the " ON " condition.
Any changes into the " ON " condition
are saved and will be displayed in the
menu "
Information " > " Statistics "
> " Error history ".
Menu item
& " System settings "
& " Tech. service level "
& " Signal inputs "
& " BACK "
Controlling the relays and mixers manually
The "manual control" facility can be
used to switch the relays and mixers
(generic term: "actuators") for starting
or testing individual components.
All control functions are disabled
as long as the " Manual control "
menu or one of its sub-menus is
called up.
All actuators can only be controlled
manually for as long as the program-
ming unit flap remains open.
Upon leaving the " Manual control "
menu (e.g. by closing the program-
ming unit flap), the relays that are cur-
rently not required for standard
control mode, are switched off by the
control unit, and the control
sequences are restarted.
Menu item
&
" System settings "
&
" Tech. service level "
&
" Manual control "
The following sub-menus are avail-
able from the "
Manual control " menu:
Menu item
&
" Switch relay "
&
" Sensor temperatures "
&
" System overview "
The " Sensor temperatures " sub-
menu can also be called up via " Infor-
mation " from the main menu. For
further information regarding the sub-
menus, see the operating instruc-
tions.
Checking signal inputs
78
Control unit settings
55
92
901
GB