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44
Fig. 45
A
Pressure gauge
B Green led
C 2-digit LED display
D Red led
E Temperature selector space heating
F Mode selector switch
G Temperature selector Domestic Hot Water*
* The parts of the manual refering to the DHW circuit should be only considered if a indirect water tank with sensor is installed, case B (Fig. 61)
A
BC
D
E
F
G
Domestic hot water (with connection to an external water tank
with probe)
The function starts if the temperature measured by the water tank
probe falls below 40°F (4°C). In this mode, a heat demand is
generated and the burner ignites at minimum power. This is
maintained until the temperature of the delivery water reaches
95°F (35°C).
NOTICE:
During the freeze protection mode, AF flashes on
the display (Fig. 56)
- circulator anti-block: if the boiler remains inactive, the
circulator performs a 30-second operating cycle every 24
hours. If the boiler is planned not to be used for a long
period, proceed as follows:
- move the function selector to OFF-RESET
- turn the main system switch to “off”
8. INDICATOR LEDS AND FAULTS
Green indicator LED (Fig. 52)
Off = boiler on stand-by, no flame
On = burner on, the boiler works regularly.
Red indicator LED (Fig. 53)
Stop: just the fault code flashes on the digital display.
Block: the red indicator LED lights up and the fault code flashes
on the digital display.
The fault code is not displayed in the OFF/RESET (
) mode. To
display it, move the function selector to
, or
F
. During
combustion analysis and the freeze protection mode, instead, it is
displayed. To reset the boiler, turn the function selector to
(OFF/
RESET) and then move it to be required position (Fig. 47). If the
boiler still doesn’t work, call in the local Service Technician.