Viessmann VITODENS 242-F Technical Manual page 82

Control units
(cont.)
Layout and functions
Modular structure
The control unit is integrated into the boiler.
The control unit comprises a standard unit, electronics modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ Optolink laptop interface
■ Operating and fault indicators
■ Reset button
■ Fuses
21°C
14°C
Boiler temperature
Programming unit:
■ Easy operation through:
– Plain text display with graphic ability
– Large font and black/white depiction for good contrast
– Context-sensitive help
– Removable programming unit; can be mounted as option on the
wall with separate accessory
■ With digital time switch
■ Control keys for:
– Navigation
– Confirmation
– Help and additional information
– Menu
■ Setting the:
– Room temperature
– Reduced room temperature
– DHW temperature
– Operating program
– Time programs for central heating, DHW heating and DHW circu-
lation
– Economy mode
– Party mode
– Holiday program
– Heating curves
– Codes
– Actuator tests
7
– Test mode
VIESMANN
82
HC1
48 °C
■ Displaying:
– Boiler water temperature
– DHW temperature
– Operating data
– Diagnostic details
– Fault messages
■ Available languages:
– Deutsch
– Bulgarian
– Czech
– Danish
– English
– Spanish
– Estonian
– French
– Croatian
– Italian
– Latvian
– Lithuanian
– Hungarian
– Dutch
– Polish
– Russian
– Romanian
– Slovenian
– Finnish
– Swedish
– Turkish
Functions
■ Weather-compensated control of the boiler water and/or flow tem-
perature
■ Control of one heating circuit without mixer and two heating circuits
with mixer
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner shutdown con-
trol
■ Adjustment of a variable heating limit
■ Pump anti-seizing protection
■ Frost protection monitoring for the heating system
■ Integral diagnostic system
■ Maintenance display
■ Cylinder temperature controller with priority control
■ In conjunction with solar control module, type SM1:
– Control of solar DHW heating and central heating backup
– Graphical representation of the solar energy yield
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Screed drying program
■ External starting and blocking (in conjunction with EA1 extension)
The requirements of DIN EN 12831 for calculating the heat load are
met. To reduce the heat-up output, the reduced room temperature will
be raised in case of low outside temperatures. The flow temperature
will be raised for a limited time to reduce the heat-up time after a set-
back phase.
According to the Energy Saving Ordinance [Germany], the tempera-
ture in each room must be individually controlled, e.g. through ther-
mostatic radiator valves.
Control characteristics
PI characteristics with modulating output
Time switch
Digital time switch (integrated into the programming unit)
■ Individual day and seven-day program
■ Automatic summer/wintertime changeover
■ Automatic function for DHW heating and DHW circulation pump
VITODENS