Functions - Viessmann VITODENS 050-W Technical Manual

Control unit
(cont.)
The control unit comprises electronics modules and a programming
unit:
■ HMI programming unit with 7-segment black/white display and
integral TCU communication module
■ HBMU heat management unit:
– For connecting actuators and sensors
■ HBMU with electric combustion control
■ Status indicator (Lightguide) for operating and fault display
The control unit can be set to the following operating modes:
■ Weather-compensated operation
An outside temperature sensor (accessories) must be connected.
■ Constant operation:
3 set flow temperatures possible, depending on level (reduced,
standard and comfort)
■ Operation with an OpenTherm controller is possible as an alterna-
tive to weather-compensated operation.
Note
The OpenTherm controller cannot be operated simultaneously with
PlusBus.
Programming unit
■ Connectivity via:
– Integral WiFi interface (Vitodens 050-W only)
– Access point mode
– Low power radio
■ With digital time switch
■ Touch buttons for:
– Navigation
– Settings
– Confirmation
– Menu
■ Adjustment of:
– Set room temperature
– Set flow temperature (in constant operation)
– Set DHW temperature
– Heating curves
– Parameter
– Test mode
Other settings, e.g. Actuator test, can be made using the soft-
ware tool
■ Display of:
– Outside temperature
– Heat generator flow temperature
– Flow temperature in heating circuits with mixer
– Set flow temperature
– DHW temperature
– Operating data
– Diagnostic data
– Fault messages

Functions

■ Control of the flow temperature (selectable):
– Weather-compensated
– Constant, optionally with room thermostat
– OpenTherm
■ Control of 1 heating circuit without mixer
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner shutdown
control
■ Setting a variable heating limit (only possible on 16, 19, 25 and
32 kW output sizes)
■ Heating system frost protection monitoring
■ Integral diagnostic system
■ Commissioning via commissioning assistant
VITODENS
■ Cylinder temperature controller with priority control
■ Hygiene function for DHW heating (short term heating to a higher
temperature)
■ External heating circuit hook-up (weather-compensated control of
flow temperature for up to 2 heating circuits in conjunction with
room thermostat)
To reduce the heat-up output, the reduced room temperature can be
raised when outside temperatures are low. To shorten the heat-up
time after a setback phase the flow temperature is raised for a limi-
ted time.
Under the German Buildings Energy Act, separate temperature con-
trol is required for each room e.g. by means of thermostatic valves.
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