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• After adjusting the air for the operation at the "minimum" output,
increase the power and proceed to define the operating curve as
described in the equipment manual.
• Check the combustion using the specific instrument at all
intermediate points on the modulation curve.
• Having finished the air and gas flow adjustment, check the actual
gas flow rate by reading the meter. Avoid keeping the burner
running if the heating capacity is greater than the maximum amount
allowed for the boiler, to avoid damaging it.
• Upon defining the modulation curve, it is possible to have an
approximate estimate of the thermal flow rate delivered at
the intermediate points be measuring the gas pressure in the
combustion head.
• Connect a pressure gauge with scale appropriate to the port -16
and measure the gas pressure.
• From the diagram obtain the thermal flow rate delivered, depending
on the value of the pressure measured without the back pressure
in the furnace.
IMPORTANT
This method permits only an approximate estimate of the
combusted thermal flow rate delivered, for a precise measuring,
refer to gas meter.
Example
•
Burner TBML 350
•
Pressure measured on port G: Ptc = 25 mbar
•
Back pressure measured in the furnace: Pcc = 4 mbar
•
Head pressure value without the back pressure in the furnace: P
= 25-4 = 21 mbar
From the diagram, in correspondence of pressure P= 31 mbar, a
combusted thermal flow rate of about 3000 kW can be inferred.
50
40
30
(Y)
20
10
0
0
0,5
1
1,5
(X)
(X) Thermal flow rate (kW x 1000)
(Y) Head gas net pressure (mbar)
2
2,5
3
3,5
4
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0006160077_201802
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AIR PRESSURE SWITCH FUNCTIONAL DESCRIPTION
The air pressure switch stops the equipment operation if air pressure
is not at the expected value.
The pressure switch must therefore be adjusted so that it is triggered
to close the NO contact (normally open) when the air pressure in the
burner reaches a particular value.
If the air pressure switch does not detect a pressure greater than that
calibrated, the equipment runs through its cycle but does not switch
on the ignition transformer and does not open the gas valves and so
the burner "locks-out".
To ensure the air pressure switch correct operation, with burner at
the minimum output, increase the adjustment value until reaching
the triggering value which must be followed by the immediate burner
lock-out.
To ensure correct operation of the air pressure switch you must, with
burner on and in 1st stage, increase its regulation value until the
burner triggers and then it immediately "locks-out".
Release the burner by pressing the appropriate button and readjust
the pressure switch until preventilation air pressure can be detected.
Air pressure sampling point is upstream the air shutters.
Adjust the setting of the pressure switch to a level slightly below the
actual air pressure detected in first stage operation. Reset the burner
and check that it starts up correctly.
ENGLISH
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