Viessmann VITOTRONIC 200-H Operating Instructions Manual page 35

Vitotronic 200-H, HK1B Operating
Terminology
(continued)
Room
set-point
temperature
Example:
For outside temperature 6.8° F (−14° C):
Legend
A Underfloor heating system, slope 0.2 to 0.8
B Low temperature heating system, slope 0.8 to 1.6
C Heating system with a boiler water temperature
in excess of 167° F (75° C), slope 1.6 to 2.0
Factory settings: Slope = 1.4 and shift = 0
Outside temperature
Legend
A Changing the slope:
The steepness of the heating curve changes
B Changing the shift:
The heating curves are shifted in parallel in a vertical
direction
Outdoor temperature
Heating curve
Heating curves illustrate the relationship between the
outside temperature, room temperature (set value) and
boiler water or (heating circuit) supply temperature.
The lower the outside temperature, the higher the boiler
water temperature or heating circuit supply temperature.
In order to guarantee sufficient heat and minimum fuel
consumption at any outside temperature, the conditions
of your building and your heating system must be taken
into consideration. The heating curve is set by your
heating contractor for this purpose.
Note: If your heating system includes heating circuits
with mixing valves, then the supply temperature for
the heating circuit without mixing valve is higher by
a selected differential than the supply temperature
for the heating circuits with mixing valve.
The illustrated heating curves apply with the following
settings:
H Heating curve shift = 0
H Standard room temperature (set value) = 68° F (20° C)
Heating circuit
A heating circuit is a sealed circuit between the boiler
and radiators, in which the heating water circulates.
A heating system may comprise several heating circuits.
For example, one heating circuit for the rooms occupied
by you and one heating circuit for the rooms of a separate
apartment.
Heating circuit pump
Circulation pump for the circulation of the heating water
in the heating circuit.
Actual temperature
Current temperature at the time of the scan; e.g. actual
DHW temperature.
Mixing valve
A mixing valve mixes the water heated in the boiler
with the cooled water returning from the heating circuit.
The water, heated to the right temperature in line with
demand, is pumped to the heating circuit by the heating
circuit pump. The control unit adjusts the heating circuit
supply temperature via the mixing valve to the various
conditions, e.g. different outside temperature.
Night setback
See "Reduced heating mode".
Standard heating mode
When you are in the house during the day, you can heat
the rooms in standard heating mode. Set the periods
using the time program for central heating. During these
periods, the rooms are heated to the standard room
temperature.
Standard room temperature
Set the standard room temperature when you are
at home during the day (see chapter "Setting the room
temperature").
Additional Information
35