Sime FORMAT SYSTEM 25 HE Installation And Servicing Instructions page 19

4.9 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. 22/a).
4. 1 0 CLEANING THE C.H. WATER FILTER
"AQUA GUARD" (fig. 22/b)
To clean the filter, close the flow and return
valvs, turn off the power to the control
panel, remove the casing and empty the boi-
ler using the drain provided until the hydro-
meter shows "zero".
Place a container for collection underneath
the filter, unscrew the cap and proceed to
clean the filter, removing impurities and
limestone deposits.
Check the seal o-ring before reassembling
the cap with the filter.
4. 1 1 CHIMNEY SWEEP FUNCTION
(fig. 23)
To carry out the verification of combustion
in the boiler turn the selector and stop on
the position ( ) until the green/orange led
starts to flash intermittently. From that
moment the boiler will start functioning 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
Fig. 22/a
eventual zone valves are open.
The test may be carried out also during hot-
water service functioning.To do so it is enou-
gh, after having activated the chimney
sweep function, to take some hot water
from one or more cocks. Even in this condi-
tion the boiler functions at the maximum
temperature always with the primary con-
trolled 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 posi-
tion; then return the selector to the desired
function.
ATTENTION: After about 15 minutes, or
once the hot water request has been ful-
filled, the chimney sweep function auto-
matically deactivates.
4. 1 2 BOILER SERVICING
4. 1 2. 1 Routine Servicing
To ensure continued efficient operation of
the appliance, it is recommended that it is
checked and serviced at regular intervals.
The frequency of service will depend on the
particular installation and conditions of
usage, but in general once a year should be
adequate.
It is the law that a competent person such
Fig. 22/b
as a Gas Safe Register registered engineer,
must carry out any service work.
4. 1 2.2 Combustion Check
Incorporated into the flue elbow or vertical
adaptor is a sampling point.
The grey plastic cap should be unscrewed
and the flue gas sampled using a flue gas
analyser.
During the test the boiler can be operated
in "chimney sweep mode" see 4. 1 1.
The correct CO
Led bicolore verde/arancio
Bi-colour green/orange
lampeggiante
flashing led
3
2
reading can be found in
2
4
5
section 4.5.
4. 1 2.3 Burner inspection
Remove the burner as described in section
6.3.
Inspect the burner and if necessary clean
using a soft brush, taking care not to dama-
ge the front insulation.
Check the Ignition/ionisation electrode,
check the gap (4 mm+/- 0.5 mm).
Before reassembly inspect all seals and
replace as required.
4. 1 2.4 Combustion Chamber
Remove any loose debris from the combu-
stion chamber using a soft brush and a
vacuum cleaner.
Take care not to damage the rear insulation
panel.
4. 1 2.5 Condensate Trap
The condensate trap would not normally
require removal during service, but can be
checked whilst the burner assembly is
removed.
Carefully pour water into the heat exchan-
ger and check that it flows freely to the
drain.
Should it require removal, firstly remove the
two wire clips securing the condensate
drain rubber pipe to the heat exchanger
and the condensate trap.
Remove the pipe.
Remove the 1/2" nut securing the conden-
sate trap to the combustion compartment.
Disconnect the drain pipe from the trap.
Clean the trap and refit in reverse order.
4. 1 2.6 Flow Switch
The operation of the flow switch should be
checked at each service.
Remove small cover retaining screw and
remove the cover.
When the pump is running and water is
flowing around the boiler, the actuator lifts
off the microswitch.
Check that the operation of the actuator.
Ensure that it is free and that it lifts and
returns.
If necessary lubricate the pivot point of the
Fig. 23
19