Control Unit For Weather-Responsive Operation; With Programming Unit; Functional Description - Viessmann VITODENS 200 Start-Up And Service Instructions

Additional Information

Control Unit for Weather-Responsive Operation

Functional description

Space heating mode
The control unit calculates a boiler
water setpoint temperature based on
the outdoor or room temperature
(where a room temperature dependent
remote control is connected) and on
the slope/shift of the heating curve.
The computed boiler water setpoint
temperature is transmitted to the
burner control unit.
From the boiler water setpoint and the
actual temperature the burner control
calculates the degree of modulation
required, and regulates the burner
accordingly.
The maximum operating boiler water
temperature is limited in the burner
control unit to 167ºF / 75ºC by the
electronic temperature control.
The maximum adjustable high limit of
the boiler is 180ºF / 82ºC.
The fixed high limits of the safety chain
interlock the burner control unit at
210 ºF/99 ºC boiler water temperature.
30 2
1
3
15 45
0 0
0 60
48
Domestic hot water supply
with gas-fired space heating boiler
Domestic hot water heating is
activated when the tank temperature is
4.5 ºF/2.5 ºC below the tank
temperature setpoint value.
The burner and the tank DHW pump
are switched on. In the factory default
setting, the desired boiler water
temperature is set at 36 ºF/20 ºC
above the tank temperature setpoint
value. When the actual tank
temperature rises 4.5 ºF/2.5 ºC above
the tank temperature setpoint value,
the burner is switched off and the time
delay function of the tank DHW pump
is activated.
Programming Unit (removable)
4
3
2
1
0
4 5 6
-
A + i 3
B
2
1
C D

with programming unit

5
6
7
8
9
10
7
8
9
10
Additional heating function (anti -
legionnaire-function) for domestic hot
water production
The additional heating function is
activated when an activation period of
10 minutes is selected (e.g. 22.10 to
22.20 hrs).
This period must lie outside the
switching times for normal domestic
hot water heating so that the signal is
recognized by the control unit.
The temperature setpoint value for
additional heating is set in coding
address "0A7".
Pressure gage
Display window
Heating program selector switch
Burner fault reset button
Emission test switch (override switch)
Selector knob for "normal room temperature"
Burner operating status indicator
Burner fault indicator
Boiler on/off switch
Party button
Energy savings button
Selector knob for "reduced room temperature"
Information button
"Factory default settings" button
Selector knob
Flip-down cover
Selector buttons
DHW comfort function switch (only available
on Combi heating boiler)