120
4 8
°C
s
A
Fig. 78
Heating mode
The selected set boiler water temperature will be main-
tained when a demand is being raised by the room
thermostat and the heating program is set to DHW and
central heating "
G
".
The boiler water temperature will be maintained at the
default frost protection temperature when there is no
demand.
The electronic temperature limiter inside the burner
control unit limits the boiler water temperature.
Flow temperature setting range: 20 to 74 °C.
DHW heating
The burner, the circulation pump and the 3-way valve
are started or changed over if the cylinder temperature
lies 2.5 K below the set cylinder temperature.
In the delivered condition, the set boiler water temper-
ature is 20 K above the set cylinder temperature
(adjustable via coding address 60 in group
"DHW"
).
The burner will be switched off and the circulation
pump run-on time will begin if the actual cylinder tem-
perature exceeds the set cylinder temperature by 2.5
K.
Weather-compensated control unit
48 °C
Boiler temperature
HC1
14°C
21°C
Fig. 79
Function description
Constant temperature control unit
5773 216 GB
Functions
Summary of Contents for B2TA
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Page 107: ...107 Parts lists Hydraulics 5773 216 GB Components ...
Page 118: ...118 0004 0002 0005 0006 0001 0003 Fig 77 Parts lists Miscellaneous 5773 216 GB Components ...
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