Vitodens 200-W B2HA/B2HB, 222-F B2TA/B2TB Operating
5461 885 - 04
40
Additional Information
Terminology
Setback mode (reduced heating mode)
See “Reduced heating mode”.
Heating program
With the heating program you determine whether you
heat your rooms and DHW, or only heat DHW or whether
you shut down your heating system with frost protection
monitoring.
You can select the following heating programs:
H
“Heating and DHW”
The rooms are heated and DHW is provided (winter
mode).
H
“Only DHW”
DHW is provided but there is no central heating
(summer mode).
H
“Standby mode”
Frost protection for the boiler and the DHW tank is
enabled, no central heating, no DHW heating.
Note:
No heating program is available for central heating
without DHW heating. When you want central
heating, hot water is generally also required (winter
mode). If you do want just central heating, select
the heating program “Heating and DHW” and set
the DHW temperature to 50°F (10°C) (see page
19). This means that you will not heat DHW
unnecessarily but the DHW tank is protected
against
frost.
Heating curve
Heating curves illustrate the relationship between the
outside temperature, room temperature (set value) and
boiler water or (heating circuit) flow temperature.
The lower the outside temperature, the higher the
boiler water or (heating circuit) flow 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 flow temperature for the
heating circuit without mixing valves is higher by a
selected differential than the flow temperature for the
heating circuits with mixing valves.
The illustrated heating curves apply with the following
settings:
H
Heating curve level = 0
H
Standard room temperature (set value) = 68°F (20ºC)
Operating status
In the heating program “Heating and DHW”, the operating
status changes from “Standard heating mode” (see page
41) to the operating status “Reduced heating mode”
(see page 41) and vice versa. The times for the operating
status change are defined when the time program is set.
Extension kit for heating circuit with mixing valve
Assembly (accessory) for controlling a heating circuit
with mixing valves. See “Mixing valves”.
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 delivered to the heating circuit by the heating
circuit pump. The control unit adjusts the heating circuit
flow temperature via the mixing valve to the various
conditions, e.g. different outside temperature.
Heating circuit pump
Circulation pump for the circulation of the heating water
in the heating circuit.
Boiler water or supply temperature
Room
set-point
temperature
Outdoor temperature
Example:
For outside temperature 7°F (-14°C):
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
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.
