Settings, Safety Checks; Firing - Cuenod C 285 Operating Instructions Manual

Start up
Working cycle test

Firing

Safety unit settings and checks
Cycle functioning test
• Open and then shut the quarter-turn
manual fuel valve.
• Charge the burner.
• In the TC of the electric control box
select the manual operation mode
S1 - S2 .
• Close the thermostatic circuit.
The leak tightness test device VPS 504
S02 is charged. After 30s if the test is
validated ; the yellow light will shine. The
control and safety unit is supplied with a
voltage; the red light of the unit will
shine.
• Reset the control and safety unit and
check that it is working correctly.
The program should function in the
following way :
- air flap totally open,
- initial blower time 30s,
- return to ignition position,
- ignition of electrodes for 6s,
- opening of the valves,
- closing of the valves after a maximum
of 3s after they were opened,
- the burner will stop functioning due to
a lack of gas pressure or due to
resetting of the control and safety unit
due to the disappearance of the flame.
In case of doubt, perform the test
previously described.
It is only after this very important
program test phase that the burner can
be fired.
Firing
Warning :
Firing should only take place when all
the conditions set out in the previous
chapters have been adhered to.
• Connect a microammeter scale (0-
100µA DC), instead of the measuring
bridge located on the TC.
• Open the quarter-turn manual valve of
the fuel.
• Close the thermostatic circuit.
The leak tester is charged. At the end of
the test (30s), the unit is charged.
• Reset the control and safety unit.
The burner will be working.
- Check :
- the combustion process once the
flame has appeared,
- the overall leak tightness of the gas
train.
There should not be any leakage.
• Read the current of ionization (a value
between 20 and 80µA).
• Measure the gas flow shown on the
counter.
• Raise the power to its nominal output
by activating the switch intermittently
S3+.
• Test the combustion.
Observe the waste gas temperature
recommended by the boiler
manufacturer to obtain the required
useful output.
According to the combustion tests,
adjust the burner while in operation to
the nominal output on the screw V of the
MB VEF valve (R for the Skp regulator).
• To increase the CO rate, increase the
2
ratio (decreasing the ratio will have the
opposite effect).
• Read the current of ionization (a value
between 20 and 80µA).
• Measure the gas output on the
counter.
• Increase or reduce the power by
increasing or reducing the value read
from the graduated vessel of the
cam I.
• Stop and then start the burner up
again.
• Check the combustion process once
the flame has appeared.
According to the measured values,
adjust the burner while in operation on
the screw N of the MB VEF valve (D for
the SKP regulator).
• If necessary, adjust the cam value III
for ignition and the cam VI for
minimum control.
The adjusting procedure is identical to
that of the cam adjustment I.
• Increase the power back up to the
nominal output and check the
combustion.
If the value has been changed by the
action performed on the screw N (D
for the SKP regulator); adjust the ratio
V (R for the SKP regulator) as
required.
• Optimize combustion results by
adjusting :
- the setting of the secondary air (Y
dimension) following the procedure
described in the chapter : "Setting
combustion components and
secondary air ";
• Increase the Y dimension, the CO
rate rises and this process can occur
inversely.
A modification made to the Y dimension
can necessitate a correction of the air
flow rate.
• Test the combustion.
Assess burner operation : on ignition,
and when power is increased and
decreased.
• Check, while the burner is functioning,
and by using a foaming liquid product
that is specially designed for this
purpose, the leak tightness of the gas
train connections.
There should not be any leakage.
• Test the safety devices.
Setting safety test devices
Gas pressure
• Set at the minimum distribution
pressure.
05/2008 - Art. Nr. 13 013 503D
Burner is working with ignition flow.
• Close the quarter-turn manual valve of
the fuel slowly.
The burner should stop functioning
owing to a lack of gas pressure.
• Re-open the quarter-turn manual
valve.
The burner will start up again
automatically.
The pressure switch is set.
• Fix and screw on the housing.
Air pressure switch.
Burner is working with ignition flow.
• Locate the switch's cut-off point (lock).
• Multiply the value by 0.8 to obtain the
setting point.
• Restart the burner.
• Progressively obstruct the aspirating
port on the motor-driven blower unit.
• Check that the CO rate is still inferior
to 10, 000ppm before resetting the
control unit.
If not, increase the air pressure switch
setting and repeat the test.
Leak testing device tester VPS :
• Open pa on the device.
• Restart the burner.
After 30s the device is safe (red light
illuminated).
• Close pa.
• Reset the leak tightness tester's safety
device by pressing the red indicator.
The test cycle is relaunched.
The burner is operational.
• Check for leaks.
• Disconnect the two cables of the
microammeter simultaneously.
The unit should reset itself immediately.
• Replace the measuring bridge, the
housings.
• Disconnect the measurement devices.
• Re-close the pressure connectors.
• Reset the unit.
The burner will be working.
• Check :
- the absence of leaks between the
2
flange and the boiler front,
- opening of regulator (limiter and
safety) circuit,
- intensity of thermal relays of the
motor-driven blower unit according
to the manufacturer's instructions.
• Check combustion under actual
operating conditions (doors closed,
etc) and absence of leaks in the
different systems.
• Note the results on the appropriate
documents and communicate them to
the dealer.
• Start-up automatic operation.
• Distribute the information required to
operate the boiler.
• Place the boiler-room plate where it
can be easily seen.
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