21
The safety devices
Water temperature probe:
if the water
temperature is close to the lock temperature
(100°C) the probe forces pellet feeding to stop.
Flue gas temperature probe:
this thermocouple
detects flue gas temperature and lets operation
continue or stops the boiler when flue gas
temperature goes below the pre-set figure.
Flue gas pressure switch:
it controls the
pressure in the flue duct. It blocks the pellet
feeding screw in the event the duct is obstructed or
there is significant counter-pressure for instance
in case of wind. The words “ALAR-DEP-FAIL” are
displayed when the pressure switch is triggered.
Manually reset water temperature safety
thermostat:
if the water temperature exceeds the
safety value set at 100° C heat stove operation
stops immediately and the display reads “
ALAR-
SIC-FAIL”. The thermostat must be manually reset
to restart it.
RESET
WATER
Electrical safety:
the heat stove is protected
against sudden current surges (e.g. lightning) by
a general 4 A fuse which is in the panel board
on the rear of the heat stove next to the power
supply cable. Other fuses to protect the electronic
boards are located on them.
Gearmotor:
if the gearmotor stops, the stove
continues operating until the flame goes out
due to fuel running out and until it reaches the
minimum cooling level.
.it
AQ 20/24
.it
AQ 28/33