Heating Curve Adjustment (Slope And Shift); Boiler Temperature Sensor; Outdoor Temperature Sensor; Sensor Location - Viessmann Vitodens 200 WB2 Series Technical Data Manual

Heating Curve Adjustment (slope and shift)

The control unit regulates the boiler water
temperature (= supply temperature of
heating circuit without mixing valve) and the
supply temperature of the heating circuit
with mixing valve (in conjunction with the
accessory kit for a heating circuit with
mixing valve) according to the outdoor
temperature.
The supply temperature that is required to
achieve a given room temperature depends
on the heating system and the thermal
insulation of the building that is being
heated.
The adjustment of the two heating curves is
used to match the boiler water temperature
and the supply temperature to these
conditions.
Heating curves:
Low temperature heating system, e.g.
radiant floor heating
Medium temperature heating system,
e.g. cast iron radiation, staple-up
radiant floor heating
High temperature heating system,
e.g. fintube radiation, fan coils
The boiler water temperature is limited
upwards by the fixed high limit and the
temperature set for the electronic high limit.
The supply temperature cannot rise above
the boiler water temperature.
Control for Weather-Responsive Operation

Boiler Temperature Sensor

The boiler temperature sensor is connected
at the control unit for weather-responsive
operation and is built into the boiler.
Max. ambient temperature
H at operation: 32 to 266 ºF
0 to 130 ºC
H when storing or
transporting: –4 to +158 ºF
–20 to +70 ºC

Outdoor Temperature Sensor

Sensor location:

H North or northwest wall of building
H 6.6 to 8.2 ft./2 to 2.5 m above ground or
in case of a multi-storey building approx.
halfway up the second floor
Electrical connection:
H 2-wire cable, max. cable length 115 ft./
35 m with a wire size of min. AWG 16
copper
H Cable to the outdoor sensor must not be
laid near line voltage wiring
(120/240 V)
Max. ambient temperature at
operation, when storing
or transporting: –40 to +158 ºF
–40 to +70 ºC
DHW Tank Temperature Sensor
Part No.
7134 239
Supplied with:
H installation fittings for horizontal DHW
storage tanks (42 to 120 USG/160 to 450
ltr) (DHW tank must be ordered separately
at time of order)
H installation fittings for vertical DHW
storage tanks (42 to 120 USG/160 to 450
ltr)(DHW tank must be ordered separately
at time of order)
H DHW production kit for Vitodens 200
Cable length approx. 13 ft./3.75 m, ready
to plug in
Max. ambient temperature
H at operation: 32 to 194 ºF
0 to 90 ºC
H when storing or transporting:
–4 to +158 ºF
–20 to +70 ºC
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