27
ENG
cleaning the heat exchanger or the bur-
ners, chemical products or steel brushes
MUST NOT BE USED.
Make sure that the tops of the burners
with the holes are free from encrusta-
tions.
4. Reassemble the items removed from the
boiler, making sure to follow the correct
sequence.
5. Check operation of the main burner.
6. After assembly of all the gas connections,
these must be tested for soundness, using
soapy water or appropriate products. DO
NOT USE NAKED FLAMES.
7. Do not use calcium chloride to treat the
plastic component during general mainte-
nance.
4.6.1 Chimney sweep function (fig. 24)
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 fun-
ctioning in heating mode at the maximum
power, with switching off at 80°C (176° F)
and restarting at 70°C (158° F).
Before activating the chimney sweep fun-
ction make sure that the radiator valves
or eventual zone valves are open. The test
may be carried out also during hot-water
service functioning. To do so it is enough,
after having activated the chimney sweep
function, to take some hot water from one
or more taps.
Even in this condition the boiler functions at
the maximum temperature always with the
primary controlled between 80°C ( 176° F)
and 70°C (158° F).
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 fulfil-
led, the chimney sweep function automati-
cally deactivates.
4.6.2 Cleaning the filter “Aqua Guard
Filter System” (fig. 24/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 boi-
ler using the drain provided.
Place a container for collection underneath
the filter, unscrew the cap and proceed to
clean the filter, removing impurities and lime-
stone deposits.
Check the seal o-ring before reassembling
the cap with the filter.
4.6.3 Venting maintenance
The venting system shall be visually inspected
for deterioration or deposits every 6 months it
is recommended to periodically inspected the
intake and the exhaust terminal for debris or
snow removed from blocking the termination.
Any dirt within the vent shall be removed with
a soft brush.
4.6.5 Fan and pump
The pump and fan don’t need any lubrification.
4.7 FAULT FINDING
The burner does not ignite and the circula-
tor is working.
1. Check that the water pressure reads 1 -
1.2 bar (14.5-17.4 psi).
2. The flowmeter is faulty, replace it.
3. The flow switch has been tripped because
the heating circuit filter “Aqua Guard Filter
System” is obstructed with impurities; it
needs cleaning.
Main burner does not start either to draw
off D.H.W. or for heating.
1. Check flowmeter; if necessary, replace it.
2. Check whether electric power is reaching
the gas valve actuator; check its operation
and, if necessary, replace it.
3. Check operation of the smoke pressure
switch.
4. The fan is operating but at low rpm, so fai-
ling to activate the smoke pressure switch;
replace the fan.
5. Replace the electronic card.
Boiler turns on, but after 10 seconds “locks
out”.
1. Check that during electric wiring the posi-
tion of line and neutral have not been inver-
ted.
2. The ignition/sensing electrode is faulty; re-
place it.
3. The control box is faulty; replace it.
Gas valve fails to modulate in D.H.W. and
C.H. modes.
1. The sensor is interrupted; replace it.
2. The modulator has a break in winding; replace
it.
3. Check that the current to the modulator
complies with the specifications.
4. The control box is faulty; replace it.
Boiler is noisy or heat exchanger makes a
sizzling sound.
1. Check whether circulation pump P is ob-
structed; if necessary clear it out.
2. Unclog impeller of circulation pump, clea-
ring away any impurities or sediments.
3. Circulation pump is burnt out or has a lower
rpm than required; replace it.
4. Check boiler output is adequate for actual
needs of heating system.
Boiler safety valve keeps tripping.
1. Flush the safety relief valve to remove any
sediment or debrit and ensure a proper val-
ve seal. If it doesn’t close properly, replace it.
2.
Check system cold charge pressure is not too
high;
keep to recommended values.
3. Check whether safety valve is out of calibra-
tion; if necessary, replace it.
4. Check whether the vessel is sufficiently capa-
cious to contain the water for the system.
5. Check preloading pressure of expansion
vessel.
6. Replace expansion vessel if faulty.
Figure 24/a
Spia lampeggiante
verde/arancio
2
4
5
3
Figure 24
FLASHING
GREEN/ORANGE LED
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