Fuel Oil Firing; Setting Of The Fuel Oil Pressure - Cuenod C 75 Instrucciones De Montaje

Start up
Description and settings of the fuel oil pump

Fuel oil firing

Key
1 Suction
2 Return
and access to the bypass screw
(4mm hex. Screw) remove for one
pipe operation. In this case, seal
return 2
3 Pressure exit
3.1 To nozzle 1
3.2 To nozzle 2
4 Two pressure connectors
5 G1/8 negative pressure take-off or
boost pressure
6.1 Setting regulator 1
6.2 Setting regulator 2
Y1 Safety and ignition solenoid valve
Y2 Intermediate stage solenoid valve
Y5 Nominal stage solenoid valve
Setting fuel oil pressure
On delivery, the pressure values are
set as shown in the attached table.
· Turn screw 6.1 (regulator 1) then
6.2 (regulator 2) clockwise to
increase pressure and vice versa.
Maximum negative pressure is 0.4bar
in case of direct suction from tank.
Maximum pressure is 2 bars for
boosting.
Check subsequently for leaks.
Principle of functioning
hydraulic
Valve
functions
Y1 Y2 Y5 Y1
At rest F F O Ø
Ignition O F O 1
Intermed. O O O 1
Nominal O O F 1
O = open - F = closed (hydraulically)
Ø = power off - 1 = power on
Firing
m
Warning:
Unit may be fired when all the
requirements listed in previous
sections have been met. Notably,
choice of priority fuel (fuel oil).
· Install on the pump :
–
if boost pressure 2bar, two
manometers graduated from :
0 to 6bar for boost pressure
–
(in 5)
0 to 30bar for atomization
–
pressure (in 4)
–
if direct suction from tank :
one vacuum gauge graduated
–
from 0 to 1bar for suction
pressure (in 5)
one manometer graduated from
–
0 to 30bar for atomization
M16 x 1.5
pressure (in 4)
M16x 1.5
· Connect a microammeter (0-500µA
DC scale) instead of measuring
bridge located near the motor
contactor.
m
Respect the direction of
M8x1
connection.
· Open fuel valves.
· Turn S1/H10.1 - S29J - S2K - S4
G1/8
Fuel oil - S7.1 switches on.
· Close thermostatic circuit.
· Release control and safety unit.
Burner is working.
Perform the following during
preventilation phase:
· Drain pump via a pressure take-off
point.
The burner starts up at minimal flow.
Check ignition quality.
· Check the following: (see table)
–
spray pressure,
–
cam VII position.
· Turn S7.2.
Burner is working in nominal flow rate.
· Check combustion.
· Read and adjust pump pressure, in
order to obtain required nominal
power.
· Adjust air flow via servomotor cam I.
Comply with smoke temperature
recommended by the boiler
manufacturer, in order to obtain
Upon ignition, only Y1 is powered
–
up. Outlet 3.1 is supplied at low
pressure.
electric
At the intermediate stage, Y1 and
–
Y2 are powered up, and outlets 3.1
Y2 Y5
and 3.2 are supplied at low
pressure.
Ø Ø
At the nominal stage, Y1, Y2 and Y5
–
are powered up, and outlets 3.1 and
Ø Ø
3.2 are supplied at high pressure.
1 Ø
1 1
06/2006 - Art. Nr. 13 013 497B
effective output required.
· Reduce the flow power at the min
air flow regulation.
· Check combustion.
According to the measured values,
adjust the burner while in operation by
altering the settings of servomotor cam
VI (minimal flaw regulation) and IV
(ignition flow regulation).
· Return power to nominal flow and
check combustion.
· Optimize combustion results by
adjusting dimension Y secondary air,
according to procedure described in
the "Checking / Setting
Combustion components and
secondary air" section.
· Reduce dimension Y, CO
2
increases and vice versa. If you
change dimension Y, you may be
required to change air flows and
spray pressure.
· If so, check combustion values.
Important:
· No longer change dimension Y.
Check operation during ignition and
when increasing or reducing power.
· Remove combustion components,
according to procedure described in
the "Checking / Setting Combustion
components and secondary air"
section.
· Check general state of the following
components: turbulator, nozzles,
end-piece, electrodes.
· Adjust settings, if required.
· Reassemble unit.
· Check fuel oil circuit for any leaks.
Maximum negative pressure is 0.4bar
in case of direct suction from tank.
· Remove manometers and vacuum
gauges from fuel oil circuit.
· Set and check safety units.
EN
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