Diesel Ignition And Regulation - baltur COMIST 122 DSPGM Manual De Instrucciones

DIESEL IGNITION AND REGULATION

1) Check that the characteristics of the nozzle (delivery and spray
angle) are suitable for the furnace (see 9353/1). If not, replace
it with a suitable one.
2) Make sure there is fuel inside the tank and that it corresponds
to the type indicated in the product identification plate on the
burner.
3) Check that there is water in the boiler and that the gate valves
on the system are open.
4) Make sure that the products of combustion can be released
freely (boiler gate valves and stack open).
5) Check that the voltage of the electric line the equipment must
be connected to complies with the manufacturer prescriptions,
and that the motor electric connections are properly set for the
available voltage. Also check that all electric connections made
on-site are performed correctly as shown in our wiring diagram.
6) Make sure that the combustion head is long enough to
penetrate the furnace as specified by the boiler manufacturer.
Check that the air regulation device on the combustion head is
in the appropriate position for supplying the required amount
of fuel (the passage of air between disc and head must be
significantly closed off if a small amount of fuel is supplied; if
the nozzle provides a rather high output, said passage must
be significantly opened); see chapter "Air regulation on the
combustion head".
7) Remove the protection cover of the rotating disc on the fuel/air
output adjustment servomotor, to reach the adjustment screws
of fuel and combustion air.
8) Turn the two modulation switches to "MIN" (minimum) and
"MAN" (manual).
9) Start the fuel supply auxiliary circuit and check for its correct
operation, then set pressure to nearly 1 bar if such circuit
features a pressure regulator.
10) Remove the vacuum gauge connection point plug from the
pump, then slightly open the gate valve on the fuel pipe. Wait
for the fuel to flow out of the hole without air bubbles and close
the gate valve.
11) Fit a pressure gauge (full scale ca. 3 bar) to the pump
vacuum gauge connection point to check the pressure
value at which the fuel reaches burner pump.
Fit a pressure gauge (full scale ca. 30 bar) in the relevant
connection point on the pump to check its operating pressure.
Fit a pressure gauge (full scale ca. 30 bar) in the nozzle return
pressure regulator connection point (8714/2) to check the
return pressure.
12) Now open all gate valves and any other shut-off element on
the diesel pipes.
13)Turn the switch on the control panel to "0" (open), and power
on the electric line the burner is connected to. Manually press
the specific remote control switches to check that the fan
and pump motors turn in the correct sense, and if necessary
change the position of two cables of the main line to invert the
rotation sense.
14) Start the burner pump by manually pressing the relevant remote
control switch until the pump pressure gauge detects a slight
pressure. A slight pressure in the circuit indicates that it has
been filled up.
15) Turn on the switch on the control panel to power the equipment.
If the safety and boiler thermostats are closed, the equipment
programmer is activated and, according to the preset
programme, it enables the burner devices. The equipment turns
on as described in the chapter "Operation description".
16) When the burner is working at its "minimum" output, adjust
the air to ensure a good combustion, loosen or tighten the
adjustment screws with the lever that moves the combustion
air adjustment gate. We recommend to keep the air quantity
at a low level when working at the "minimum" output to ensure
a perfect ignition even in the most difficult conditions.
17) After adjusting the air for the operation at the "minimum" output,
turn the modulating switches to "MAN" (manual) and "MAX"
(maximum).
18) The fuel/air adjustment servomotor starts. Wait for the disc
with the adjustment screws to perform an angle of nearly 12°
(corresponding to the space of three screws) and turn the
switch to "0" to stop the modulation. Visually check the flame
and, if necessary, adjust the air and gas output by acting on the
adjustment disc screws to obtain an efficient combustion. The
operation above must be progressively repeated making the
disc turning by ca. 12° each time, and adjusting, if necessary,
the gas and air output along the modulation stroke. Make
sure that the gas output is progressive and gradual, and to
have the maximum output at the end of the modulation stroke.
This condition is necessary to ensure a good flame modulation.
The maximum output is obtained with a return pressure approx.
2 ÷ 3 bar lower than the delivery one (usually 20 ÷ 22 bar).
For a correct air/fuel ratio the detected value of carbon dioxide
(CO ) must increase as the output increases (indicatively at
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least 10% at the minimum output up to the best value of nearly
13% at the maximum output).
Do not exceed 13% of CO
i
quantity of air leading to an increase in the smoke
opacity for atmospheric pressure variations, dust
deposits in the fan air ducts, etc.. The smoke opacity
is strictly linked with the type of used fuel.
We recommend keeping the smoke opacity at a value
lower than no. 2 of the Bacharach scale, even if the
CO value could be slightly lower. Less opaque smoke
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dirties the boiler less, and leads to a better performance
even if CO
good adjustment requires the system temperature to
be at the standard operating degree, and the burner
being working since at least 15 minutes. If suitable
instruments are not available, look at the flame colour.
We recommend to adjust the system until obtaining a
light orange colour instead of a red flame with smoke, or
a white flame with too much air. After making sure that
the air/fuel mixture is correct, tighten the adjustment
screws retainers.
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to avoid working with a low
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level is slightly lower. Remember that a
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