Control For Weather-Responsive Operation; Constructional Design And Functions; Modular Structure - Viessmann Vitodens 200 WB2 Series Technical Data Manual

Control for Weather-Responsive Operation

Control for Weather-Responsive Operation
Built into the Vitodens 200 boiler is a menu-driven programming unit with...
H day and week feature and four
programmable activation periods per day
for reduced operation, activation of DHW
production or activation of the DHW
circulating pump

Constructional Design and Functions

Modular Structure

The control unit contains:
System on/off switch, override/emission
test switch, comfort switch (operational
only on Combi heating boiler), fixed high
limit, adjustable high limit, digital display,
micro-computer, adjustment options for
switching times, for temperatures during
normal and reduced operation, domestic hot
water temperature, adjustment options for
heating curves, temperature scanning
options, built-in diagnostic system and
fuses.
Boiler-Specific Functions
The control unit adjusts the boiler water
temperature (= supply temperature of a
direct-connected heating circuit and/or a
heating circuit with mixing valve in conjunction
with the accessory kit for a heating circuit
with mixing valve) automatically and on a
continuous basis to individual outdoor
temperatures. The control has a DHW
temperature controller with DHW priority
switching (heating circuit pump off).
Technical Data
Rated supply
voltage: 120 VAC
Rated frequency: 60 Hz
Rated current: 12 A
Max. ambient
temperature
H at operation: 32 to 104 ºF
0 to 40 ºC
For use in your living
area or boiler rooms
(with standard ambient
conditions)
H when storing or
transporting: –4 to +149 ºF
–20 to +65 ºC
30
H freeze-up protection of entire heating
system
H integrated diagnostic system
H integrated DHW tank temperature control
Max. operating tempearture
setting (space heating): 167 ºF/75 ºC
Adjustment range
adjustable high limit
(DHW production): 108 to 172 ºF
42 to 78 ºC
Setting fixed
high limit: 210 ºF/99 ºC
(not adjustable)
Adjustment range
of DHW tank setpoint
temperature: 50 to 140 ºF
10 to 60 ºC
Adjustment range
heating curves
H Heating curve
slope 0.2 to 3.5
H
H Heating curve
shift: 10 to
H
–12 to +33 ºC
Programming Unit
H Illuminated display with 8 text lines
H Menu-driven user guidance
H All settings, main codings and fault
messages shown in plain text
H Holiday program
H Party button for switching to "normal
operation" whenever required
H Energy savings button for lowering the
desired room temperature by approx.
3.6 °F/2 °C in normal operation
The programming unit can be used as a
remote control (wall-mount base must be
ordered separately).
Timer Schedule of Programming Unit
Digital timer with day and week feature,
calendar and automatic resetting to daylight
savings time.
Timer of Programming Unit
Time, day and standard switching times are
factory preset (individually programmable),
up to four switching times selectable per
day.
Shortest switching
interval:
Power reserve:
Heating Programs
The freeze-up protection function
in all operating modes.
The following heating programs can be
selected with the operating mode selector
switch:
H Continuous standby
91 ºF H DHW production only
H Normal operation/reduced operation or
normal operation/standby
*1
See "Freeze-up Protection Function"
below.
Freeze-up Protection Function
The freeze-up protection function is
H activated when the outdoor temperature
drops below approx. 34 °F/1 °C.
When the freeze-up protection function is
activated, the heating circuit pump is
activated and the boiler water is kept at a
minimum temperature of approx.
68 °F/20 °C.
H deactivated when the outdoor temperature
exceeds approx. 37 °F/3 °C.
Summer Operation
Heating program "
The burner is only activated upon a call for
domestic hot water from the DHW storage
tank (controlled by DHW tank temperature
sensor).
(continued)
10 minutes
15 years
*1
is active
"