Viessmann VITODENS 200-W B2HE 85 Operating Instructions Manual page 45

Vitodens 200-W B2HE Operating
Terminology
(continued)
Heating curve slope
Outside temperature
For outside temperature 7°F (−14°C):
A Infloor heating system: Slope 0.2 to 0.8
B Low temperature heating system: Slope 0.8 to 1.6
C System with a supply temperature in excess of 167°F
(75°C), slope 1.6 to 2.0
A If you change the slope:
The steepness of the heating curves changes.
B If you change the shift:
The heating curves are shifted in parallel in a vertical
direction.
B If you change the standard room temperature (target
room temperature):
The heating curves are offset along the "Target room
temperature" axis.
Slope
Outside temperature
Heating curve
Heating curves illustrate the relationship between the
outside temperature, the target room temperature and
the supply temperature. The lower the outside
temperature, the higher the supply temperature.
In order to guarantee sufficient heat with minimum fuel
consumption at any outside temperature, the conditions
of your building and system must be taken into
consideration. The heating curve is set by your contractor
for this purpose.
Setting the slope and shift, taking the heating curve as an
example
Factory settings:
Slope = 1.4
Shift = 0
The illustrated heating curves apply with the following
settings:
Heating curve level = 0
Standard room temperature (target room temperature)
= 68°F (20°C)
Note: Setting the slope or shift too high or too low will
not cause any damage to your heating system.
Both settings affect the level of the supply
temperature, which may then be too low or
unnecessarily high.
Appendix
45