Expansion Vessel; Cleaning And Maintenance - Sime Planet Dewy 25 BF Manual Del Usuario

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 REMOVAL OF OUTER CASING
It is possible to completely disassemble
the shell for an easy maintenance of the
boiler following these simple instructions
(fig. 27):
– Remove the two screws locking the front
panel to the sides.
– Pull the front panel (5) forwards so as to
release it from the slot-in pins located on
the sides.
– Unscrew the two screws fixing the instru-
ment panel to the sides.
– Unscrew the four screws fixing the sides
to the instrument panel support.
– Push the sides (3) and (4) upwards, sli-
ding them out of their slots.
KEY
1 Self-tapping screw
2 Rear panel
3 L.H. side panel
4 R.H. side panel
5 Front panel
4.8 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
114
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. 28).
4.8. 1 Cleaning the
"Aqua Guard" filter
"BF" vers. (fig. 28/a)
To clean the filter, close the delivery/return
on/off taps, turn off the power to the con-
trol 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 limestone depo-
sits. Check the seal o-ring before reassem-
bling the cap with the filter.
Fig. 27
Fig. 28/a
FLASHING YELLOW LED
SPIA GIALLA INTERMITTENTE
4.8.2 Chimney sweep function
The chimney sweep function works only on
model "BFT".
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
function 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.
Fig. 28
)
Fig. 29