IT
ES
PT
GB
115
4.5
DISASSEMBLY OF
EXPANSION VESSEL
To disassemble the expansion vessel, pro-
ceed as follows:
–Make sure that the water has been emp-
tied out of the boiler.
–Unscrew the connection and the locknut.
–Remove the expansion vessel.
Before refilling the system, using a pressu-
re gauge attached to the valve make sure
that the expansion vessel is preloaded at a
pressure of 0.8 to 1 bar.
4.6
CLEANING AND
MAINTENANCE
Preventive maintenance and checking of
efficient operation of equipment and safety
devices must be carried out exclusively by
authorized technical personnel.
During maintenance operations the
authorised technician must check that
the syphened drip is full of water
(this
check is of importance particularly when
the generator has been out of use for a long
period of time). Filling is done via the special
opening (fig. 24).
4.6.1
Disassembly the control panel
and skirt cover lid
(fig. 25)
To remove the cover, take out the screws
(1 – 2) that hold it in place on the instru-
ment panel. Position side
“A”
of the brack-
et on the skirt side so that the instrument
panel is hooked on the side in order to
facilitate this operation.
4.6.2
Chimney sweep function
To carry out the verification of combustion
in the boiler, turn the selector and stop on
the position ( ) until the orange led (
)
starts to flash intermittently (fig. 29).
From that moment the boiler will start func-
tioning in heating mode at the maximum
power, with switching off at 80°C and
restarting at 70°C.
Before activating the chimney sweep func-
tion make sure that the radiator valves or
eventual zone valves are open.
The test may be carried out also during hot
water functioning. To do so it is enough,
after having activated the chimney sweep
function, to take some hot water from one
or more taps; after a few minutes the
request of the hot-water service feeler is
activated and it automatically switches on
the led (
). Even in this condition the boil-
er functions at the maximum temperature
always with the primary controlled between
80°C and 70°C. During the entire duration
of the testing the hot water taps must
remain open. After verifying the combustion
the boiler should be switched off by placing
the selector on the (
OFF
) position; then
return the selector to the desired function.
ATTENTION: After about 15 minutes the
chimney sweep function automatically
deactivates.
4.6.3
Cleaning the “Aqua Guard
Filter System”
(fig. 27)
Model
“30/80”
, to clean the filter, close
the delivery/return on/off taps, turn off
the power to the control panel, remove the
casing and empty the boiler using the drain
provided. Place a container for collection
underneath the filter and proceed to clean
the filter, removing impurities and limesto-
ne deposits. Check the seal o-ring before
reassembling the cap with the filter.
Lato A
Lato A
Fig. 25
1
2
Side A
Side A
SPIA GIALLA INTERMITTENTE
Fig. 26
Fig. 24
Fig. 27
FLASHING YELLOW LED
Summary of Contents for DEWY 30/130
Page 33: ......
