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MINIMUM VENTILATOR SPEED (P. LP)
- Select parameter LP
- Press the ENTER button, then modify the value of the parameter by turning
the sanitary water temperature selector. The minimum speed of the fan is
linked with the type of gas and the power of the boiler, table 2
- Turn the sanitary water temperature selector in order to adjust the set value
- Confirm the new value you have set by pressing ENTER.
The value indicated on the display is expressed in revs min/100 (example
3600 = 36).
The value set during this operation automatically modifies the maximum
value of parameter 24.
VENTILATOR IGNITION SPEED (P. SP)
- Select parameter SP
- Press the ENTER button, then modify the value of the parameter by turning
the sanitary water temperature selector. The standard slow start value is
3700 revs/min (25HE) - 3300 revs/min (35HE)
- Confirm the new value you have set by pressing ENTER.
MAXIMUM POWER ADJUSTMENT (P. HH) (Fig. 1.17)
- Turn the boiler OFF
- Select the parameter HH and wait for the boiler to come on
- Check that the maximum CO
"Checking combustion parameters") corresponds with the values indicated
in table 3.
If the CO
proves to comply with the values in the table, proceed to adjust the
2
next parameter (LL - adjusting the minimum), if different modify the value by
turning the maximum power adjustment screw with a screwdriver (clockwise
to decrease) until you obtain a value contained in table 3.
MINIMUM POWER ADJUSTMENT (P. LL) (Fig. 1.17)
- Select the parameter LL (with the boiler still OFF) and wait for the boiler
to come on.
- Check that the minimum CO
"Checking combustion parameters") corresponds with the values indicated
in table 4.
If the CO
proves to be different from the values in the table, proceed to
2
adjust the parameter by turning the maximum power adjustment screw after
having unscrewed the protective cap (clockwise to increase) until you obtain
a value contained in table 4.
IGNITION SPEED (P. MM)
- Select parameter MM.
The boiler starts at the slow ignition speed.
- Turn the heating water selector to increase or decrease the fan speed.
MINIMUM HEATING ADJUSTMENT POSSIBILITY (P. 24)
- Select parameter 24
- Press the ENTER button to access the parameter value modification
function
- Turn the sanitary water selector to modify the minimum fan speed
- Confirm the value you have set by pressing ENTER.
Exit the CALIBRATION & SERVICE function by pressing ESCAPE.
The boiler returns to the "- -" (OFF) status.
To reset, press the
button.
- Disconnect the pressure gauge and tighten the pressure tap screw.
RANGE RATED MAXIMUM OUTPUT CH (FAN SPEED) - 23
Select the parameter 23 by turning the encoder. Push ENTER button and
modify the maximum fan speed as indicated in the range rated table by
turning the encoder. Push ENTER button to store the alue. The values just
setted must be recorded on the last page of this manual.
After adjusting the gas valve, seal it with sealing wax.
After making adjustments:
- return the temperature set with the ambient thermostat to the required
position
- close the panel
- put back the shell.
19 - GAS CONVERSION
It is easy to transform gas from one family to gas belonging to another family
even with the boiler installed.
This job must be done by professionally qualified personnel only.
The boiler is supplied to run on natural gas (G20) – see the product rating
plate for details.
The boiler can be transformed to use propane gas using a special kit.
Follow the instructions given here below for disassembly:
- Switch off the power to the boiler and turn off the gas cock
- Remove the panel and casing
- Lift up and rotate the instrument panel
- Open the air box cover
reading on the analyser (see paragraph
2
reading on the analyser (see paragraph
2
Table 1
MAXIMUM NUMBER OF FAN REVOLUTIONS
25 C.S.I.-R.S.I.
35 C.S.I.-R.S.I.
Table 2
MINIMUM NUMBER OF FAN REVOLUTIONS
25 C.S.I.-R.S.I.
35 C.S.I.-R.S.I.
Table 3
25 C.S.I.-R.S.I. - CO
max
2
35 C.S.I.-R.S.I. - CO
max
2
Table 4
25 C.S.I.-R.S.I. - CO
min
2
35 C.S.I.-R.S.I. - CO
min
2
For 25 HE only: unscrew the screws fastening the silencer (A) and remove
it (Fig. 1.18)
- Disconnect the mixer gas ramp. Unscrew the clamp screws and relative
mixer springs to fan and then remove it.
- For HE 35 only: unscrew the screws fixing the plastic Venturi to the alu-
minium shell
- Loosen the plastic Venturi (B) - Fig. 1.18 - by levering from under the teeth
(BE CAREFUL NOT TO FORCE THEM) and press from the opposite side
until it is completely extracted from the aluminium shell.
- Using wrench CH6 remove and DISGARD AND DO NOT RE-USE the 2
nozzles (C), clean plastic debris from relative housing (Fig. 1.20)
- Press in the 2 new nozzles from the kit as far as the threaded part, then
screw in tightly
- Reassemble the mixer with the flap in a horizontal position and the spacer
springs placed at 120° as shown in the (Fig. 1.20)
- Reassemble gas ramp and silencer, working vice versa.
- Check the number of times the fan turns
- Switch on the power to the boiler and turn on gas cock again
- Fill in and stick on the accompanying transformation data label
- Close the air box cover
- Close up the instrument panel again
- Reassemble the casing and panel
Programme the "Gas type" parameter and regulate the boiler following the
instructions in the "Adjustments" section.
Transformation must be done by qualified personnel only.
After completing transformation, regulate the boiler again following
instructions given in the specific paragraph and apply the new identi-
fication label from the kit.
General maintenance
Be particularly careful when handling the mixer: the Clapet juts out from the
body so that the mixer must be laid on the air inlet side (flap area) or make
sure the Clapet is inside the body if it has to be laid on the Clapet side.
The Clapet must never have to bear the weight of the mixer.
Clean the Venturi from any dust with an aspirator during the annual system
cleaning. Check that flap and Clapet are working correctly (all open at rated
flow, all closed at minimum flow)
20– CHECKING COMBUSTION PARAMETER
Do as follows to analyze combustion:
- go to GAUGING & SERVICE and set the combustion analysis password
as given in paragraph "Adjustments"
- insert the analyzer probe into the specific openings on the air box, after
removing screw B and cap C.
The fumes analysis probe must be introduced as far as possible
- screw the analyzer setscrews into the fumes analysis opening
- the first display gives the reading of the number of turns corresponding to
maximum heating power set on the boiler (see paragraph "Adjustments"
item P23)
After turning the domestic hot water temperature selector again the boiler
will ignite to check combustion
- check combustion
- refer to the "Adjustments" paragraph if the boiler has to be gauged
- remove the analyzer gauge and close the combustion analysis openings
by their screws.
IMPORTANT
The function switching off the boiler when the water temperature reaches
maximum limit of about 90°C will also stay on during combustion analysis
ENGLISH
G20
G31
60
60
60
59
G20
G31
12
19
12
19
G20
G31
9,0
10,0
9,0
10,0
G20
G31
9,5
10,0
9,5
10,0
rpm
rpm
rpm
rpm
%
%
%
%
25
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