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4.3
VALVE GAS CALIBRATION
After calibrations, check the CO2 values
with a combustion analyser. If they deviate
more than 0.2 from the table values, the fol-
lowing corrections must be made :
- To correct CO2 to the "MIN" power, use
the OFF-SET screw (2 fig. 18).
- To correct CO2 to the "MAX" power, use
the shutter (1 fig. 18).
4.3. 1
Verification in pressure
Single modules are calibrated in heating
position.
∆
"
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 (fig. 18).
Air pressure switch
Pressostato aria
Gas pressure is always adjusted with the
fan on minimum.
Sequence of operations:
1) Press and hold the button down for a
few seconds
2) Press the button for a few seconds
3) Completely unscrew to the valve gas
shutter (1 fig. 18)
4) Use the gas valve OFF-SET adjustment
screw (2 fig. 18) and find the "
gas" alue in the table:
GAS
Natural gas
Propane
GAS
Natural gas
Propane
2
5) Use the shutter (1 fig. 18) and find the
.
.
∆
p aria-
4.4
mm H
O
2
4.2 ±0. 1
To simplify maintenance operations on the
6.3 ±0. 1
boiler, it is also possible to completely remo-
ve the shell, as shown in Figure 19.
"W.C.
Turn the control panel to move it forward
0. 1 65 ±0.004
and be able to access the internal compo-
0.248 ±0.004
nents of the boiler.
1
Fig. 18
∆
"
p air-gas" value in the table:
GAZ
mm H
O
2
Gaz natural
3.0 ±0. 1
Gaz propane
4.7 ±0. 1
GAZ
"W.C.
Gaz natural
0. 1 18 ±0.004
Gaz propane
0. 1 85 ±0.004
DISASSEMBLING
THE SHELL
ENG
FR
37
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