Control and display elements
A
Pressure gauge
B
Fault display (red)
C
ON indicator (green)
D
Reset button
E
User interface
F
ON/OFF switch
Keys at the user interface:
O
Set boiler water tempera-
ture
F
Set DHW temperature
O
+
F
Emissions test function
K
Standby mode
L
DHW only
G
Heating and DHW
/
No function
b
/
a
Setting values
d
Confirmation
c
Information
e
Standard settings (Reset)
Heating mode
The selected set boiler water tem-
perature will be maintained 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 protec-
tion temperature when there is no
demand.
The boiler water temperature will be
limited:
&
To 74 °C by the control thermostat
inside the burner control unit.
&
To 82 °C by the electronic tempera-
ture limiter inside the burner control
unit.
&
To 100 °C by the temperature limiter
in the safety chain (interlocks the
burner control unit).
Constant temperature control unit
91
Function description
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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