– Remove the three screws securing the fan.
– Tilt the fan forwards and remove in a downwards direction.
– Inspect the fan assembly and clean if necessary.
5.3
HEAT EXCHANGER
Inspect the heat exchanger, and clean if necessary as
showed in fig. 16.
5.4
WATER FLOW SWITCH
– Revome the cover from the micro assembly to gain
access to the flow switch spindle.
– Ensure the spindle is free to move (see fig. 17).
– Re-assemble the cover.
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 restar-
ting 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 combu-
stion 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 4. Adjust if necessary as
15
8 SEALED CHAMBER SCREWS
BURNER MANIFOLD
UNION
3 FAN FIXING SCREWS
7 COMBUSTION CHAMBER
FRONT PANEL SCREWS
MAIN EXCHANGER
Fig. 16
Fig. 17
Summary of Contents for FORMAT 34E BF
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