Viessmann VITODENS 300-W Technical Manual page 82

Control units
(cont.)
■ With radio interface for communication with the following:
– Wireless outside temperature sensor
– Vitotrol 200 RF
– Vitotrol 300 RF
– Vitocomfort 200
– Wireless repeater
■ Operating keys for:
– Navigation
– Confirmation
– Help and additional information
– Menu
■ Adjustment of:
– Room temperature
– Reduced room temperature
– DHW temperature
– Heating program
– Time programs for central heating, DHW heating and DHW circu-
lation
– Economy mode
– Party mode
– Holiday program
– Heating curves
– Codes
– Actuator tests
– Test mode
■ Display of:
– Boiler water temperature
– DHW temperature
– Operating data
– Diagnostic details
– Fault messages
■ Available languages:
– English
– Bulgarian
– Czech
– Danish
– English
– Spanish
– Estonian
– French
– Croatian
– Italian
– Latvian
– Lithuanian
– Hungarian
– Dutch
– Polish
– Russian
– Romanian
– Slovenian
– Finnish
– Swedish
– Turkish
Functions
7
■ 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
■ Setting a variable heating limit
■ Pump anti-seizing protection
■ Frost protection monitoring for the heating system
■ Integral diagnostic system
■ Flow rate monitoring
■ Hydraulic balancing of a heating circuit without mixer and without low
loss header using Vitosoft 300 SID1. In conjunction with service case
for automatic hydraulic balancing (accessories) and the flow rate
sensor installed in the Vitodens.
VIESMANN
82
■ Communication via radio interface
■ 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
– Graphic illustration of the solar energy yield
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Screed drying program
■ Option to connect DHW circulation pump to the control unit
■ External starting and blocking (in conjunction with extension EA1)
■ Capable of communicating via integral LON communication module
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
■ Time, day and standard switching times for central heating, DHW
heating and the DHW circulation pump are factory-set
■ Switching times are individually programmable, i.e. up to four switch-
ing periods per day
Shortest switching interval: 10 minutes
Power reserve: 14 days
Setting the operating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
The following heating programs can be selected:
■ Heating and DHW
■ Only DHW
■ Standby mode
External heating program changeover in conjunction with EA1 exten-
sion.
Frost protection function
■ The frost protection function will be started when the outside tem-
perature drops below approx. +1 °C.
With frost protection, the heating circuit pump is switched ON and
the boiler water is maintained at a lower temperature of approx.
20 °C.
The DHW cylinder will be heated to approx. 20°C.
■ The frost protection function will be stopped when the outside tem-
perature rises above approx. +3 °C.
Summer mode
Operating program "w"
The burner only starts when the cylinder needs reheating or when
DHW is drawn from a combi boiler.
Adjusting the heating curves (slope and level)
The Vitotronic 200 controls the boiler water temperature (= flow tem-
perature of the heating circuit without mixer) and the flow temperature
of the heating circuits with mixer (in conjunction with the extension kit
for one heating circuit with mixer) in weather-compensated mode. The
boiler water temperature is automatically boosted by between 0 and
40 K higher than the currently required set flow temperature (delivered
condition 8 K).
VITODENS