Operating instructions
28
1
A
B
8. GAS ADJUSTMENTS
The boiler can be converted to use either
methane (natural) gas (G20) or L.P.G. (G30
- G31) by an Authorised Service Centre.
The operations that must be performed are
the follo
wing:
1. Replace the jets on the main b urner (see
table
in section 8);
2. Adjust the maxim um and minim um ther-
mal capacity values
for the boiler
(see table in section 8 and 8.2
Adjusting the Gas Pressures);
3. Adjust the maxim um
thermal power set-
ting;
4. Adjust the soft-light f eature (see table
below for recommended pressure);
5. Adjust the ignition dela y feature for the
heating system by adjusting the
jumper 2 as shown in Section. 6.13 (can
be set from 0 to 2 mins .).
8.1 Changing the Type of Gas
CATEGORY
II2H3+
Model
Microcombi
Methane Gas
G20
Liquid
Butane Gas
G30
Liquid
Propane Gas
G31
Recommended
Soft-light
Pressure
(mbar)
TP 23 5 12 12
TP 30 4.5 12 12
Model CATEGORY II2H3+ Methane Gas
G20
Liquid Butane Gas
G30
Liquid Propane Gas
G31
TP 23
TP 30
Lower Wobbe Index (15°C;1013mbar)
MJ/m
3
h
Nominal Delivery Pressure mbar
Minimum Delivery Pressure mbar
45.67
20
20
80.58
29
28
80.58
37
36
TP 23 Main Burner: n. 14 jets (ø) mm
Consumption (15°C; 1013mbar) m
3
/h
Consumption (15°C; 1013mbar) Kg/h
Gas Burner Pressure
max - min mbar
1.25
2.80
----
11.3 - 2.0
0.72
----
2.09
28.1 - 5.0
0.72
----
2.06
35.6 - 6.8
TP 30 Main Burner: n. 14 jets (ø) mm
Consumption (15°C; 1013mbar) m
3
/h
Consumption (15°C; 1013mbar) Kg/h
Gas Burner Pressure
max - min mbar
1.35
3.49
---
11.5 - 2.2
0.80
---
2.60
26.8 - 5.3
0.80
---
2.56
34 - 6.5
8.2 Adjusting the Gas Pressures
Setting the minimum and the maximum power of the boiler
1. Check that the supply pressure and dynamic pressure to the
gas valv
e is a minimum of 20 mbar for natural gas.
2. To do this, loosen the screw “A”.
Fit the pipe of the pressure gauge to the inlet pressure con-
nection of the gas v alve “B” and check for the correct stand-
ing pressure,
then oper ate the appliance and chec k for the
correct working pressure.
When you have completed this oper ation, replace the scre w
“A” securely into its housing to seal off the gas (chec k for
tightness).
3. To check the pressure supplied by the gas valve to the burner,
loosen the scre
w “C”
. Fit the pipe of the pressure gauge to the
pressure outlet test point of the gas v alve “D”.
Disconnect the compensation pipe “D1” either from the gas
valv
e or from the sealed chamber.
4. Push the On/Off b utton to “ON” position -green light- and
ensure that the hot w ater temperature control knob is set to
maximum.
Tur
n on the boiler by running a hot water tap.
Adjust the 10mm nut “E” on the modureg to set the maximum
gas pressure,
turn the nut clockwise to increase and anti clock-
wise to decrease the pressure until the required pressure is
achieved (see TABLE A page 28).