Operation Manual

9
16/09/2015 - 300017846-02 GTU C 330
3. Technical description
3.4 Description of the B3 control panel
1. General ON (1) / OFF (0) switch
2. Alarm indicator
This indicator lights up when the burner is on safety (failure).
3. Switch TEST-STB/
.
/
%
Position
.
: DHW + Heating
Position
%
: DHW
Position TEST-STB: Temporary action to test the safety
thermostat
4. Safety thermostat with manual reset
Set to 110° C
5. Timed circuit breaker (10 A) with delayed action and manual
reset
6. Pump shutdown switch
7. Electronic thermostat
Set the boiler temperature between 30° C and 90° C using
manual setting.
8. Indicator lights up
Boiler temperature display
9. Location for flue gas thermometer (optional)
10. Switch for selecting the number of burner stages

When preparing domestic hot water
11. Electronic thermostat
Regulating the storage temperature of domestic hot water between
10° C and 80° C.
12. Indicator lights up
Domestic hot water display

After switching on, the system performs an automatic purge of
the accumulator interchanger for one minute by intermittently
operating the domestic load pump and the heating pump. This
purge sequence is deactivated if the temperature in the
accumulator is above 25º C.
13. Location for hour run meter (Option)