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18
5.5
CHIMNEY SWEEP FUNCTION
(combustion analysis)
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 function make sure
that the radiator valves or eventual zone valves are open.
The test may be carried out also during D.H.W. mode.
To do so it is enough, after having activated the chimney
sweep function, to take some hot water from one or more
outlets.
Even in this condition the boiler 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, or once the hot
water request has been fulfilled, the chimney sweep func-
tion automatically deactivates.
5.6
RE-ASSEMBLY
– Re-assemble all the components in reverse order and
replace all the gaskets fitted in the gas line.
Ensure that all seals are correctly fitted and that the pres-
sure sensing line is correctly fitted.
Check that the fan earth connection is correctly re-fitted.
Note that the fan polarity (Line and Neutral) is immaterial.
– Check for gas soundness before fitting the casing.
5.7
RE-COMMISSIONING
– Turn on the gas supply, and check for gas soundness
whilst the appliance is running.
– Check the operation of the appliance in both C.H. and
D.H.W. mode and ensure in both cases that the burner
pressure after at least 5 minutes running is as stated on
the data plate or in
Table 3
.
Adjust if necessary as described in section 8.
When any service or replacement of electrical components
which has required the breaking and re-making of electrical
connections has taken place, the following tests must be
repeated:
– earth continuity;
– short circuit;
– polarity;
– resistance to earth.
5.8
CLEANING THE C.H. WATER FILTER (fig. 25/a)
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 (13 fig. 2) until the hydrometer 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.
Fig. 25/a