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4
USE AND MAINTENANCE
4.1
SINGLE MODULE CALIBRATIONS
GAS CONVERSION
– Close the gas cock.
– Replace the injector (pos. 30)
and the relevant gasket (pos.
45).
– Cut the specified resistance on
the fan control board.
– Test for soundness all the gas
Single modules are calibrated in heating position.
" p air" ADJUSTMENT
To measure " p air" simply con-
nect the differential pressure
gauge, equipped with a decimal
scale in mm H
O or Pascal, to the
2
positive and negative sockets on
the air pressure switch (Drawing
1) .
Operating sequence:
1) Rotate the module heating
power adjustment trimmer
clockwise to the limit (B –
Drawing 2) ; fan on maximum.
2) Find the "max p air" values in
the table, using the fan board
"MAX" trimmer (Drawing 3) :
Max. p air (mm H
O)
2
Single module 60 kW 100 kW
G20
60.0 ±2 65.0 ±2
G31
63.0 ±2 70.0 ±2
3) Rotate the module heating
power adjustment trimmer
counter-clockwise to the limit (B
– Drawing 2) ; fan on minimum.
4) Find the "min p air" values in
the table, using the fan board
"MIN" trimmer (Drawing 3) :
Min. p air (mm H
O)
2
Single module 60 kW
100 kW
G20
5.8 ±0,2 6.5 ±0,2
G31
10.9 ±0,2 7.0 ±0,2
After calibrations, check the CO
must be made:
Methane (G20)
"MIN" Power
9.0 ±0,2
"MAX" Power
9.0 ±0,2
– To correct CO
to the "MIN" power, use the OFF-SET screw (2 – Drawing 6) .
2
– To correct CO
to the "MAX" power, use the shutter (1 – Drawing 6) .
2
74
connections using soapy water
or appropriate products.
DO NOT USE NAKED FLAMES.
– Stick onto the casing panel the
plate showing the relevant fee-
ding gas.
– Proceed with air and gas cali-
bration as described below.
Air pressure switch
Pressostato aria
Drawing 1
Drawing 2
B
" p air"
min/max
adjustment
Drawing 3
values with a combustion analyser. If they deviate more than 0.2 from the table values, the following corrections
2
CO
2
Propane (G31)
10.0 ±0,2
10.0 ±0,2
45
" p air-gas" ADJUSTMENT
To measure " p air-gas" simply
connect the positive socket on
the differential pressure gauge to
the downstream pressure fixture
and the negative socket to the air
pressure switch (Drawing 4) .
Gas pressure is always adjusted
with the fan on minimum.
Operating sequence:
1) Rotate the module heating
power adjustment trimmer
counter-clockwise to the
limit (B – Drawing 5) ; fan on
minimum.
2) Completely unscrew the valve
gas shutter (1 – Drawing 6) .
3) Use the gas valve OFF-SET adjustment screw (2 – Drawing 6) and
find the " p air-gas" value in the table.
Shutter open (mm H
O)
2
Single module
G20
4.2 ±0, 1
G31
9.2 ±0, 1
4) Use the shutter (1 – Drawing 6) and find the " p air-gas" value in
the table:
Adjusted shutter (mm H
O)
2
Single module
G20
G31
30
Air pressure switch
Pressostato aria
60 kW
100 kW
Drawing 4
B
Drawing 5
1
1
2
60 kW
100 kW
Drawing 6
60 kW
100 kW
5.2 ±0, 1
6.5 ±0, 1
60 kW
100 kW
3.8 ±0, 1
4.3 ±0, 1
8.7 ±0, 1
4.6 ±0, 1
GB - 04/08
Fig..18
2
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