Firing; Setting And Checking Of Safety; Devices - elco ES08.5200 G/F-VT Betriebsanleitung

Commissioning
Checking the operating sequence

Firing

Setting: safety checks
Checking the operating sequence
• Open the quarter-turn hand-operated
fuel valve, then immediately close it
again.
• Switch the burner on.
• On the control cabinet TC select the
manual operation mode
S1 - S2
• Close the thermostatic circuit.
The leak tightness test device VPS 504
S02 is switched on. After 30 seconds, if
the test is validated; the amber light
comes on. The control and safety unit is
powered on; the red light on the control
unit comes on
• Open the control unit and check that it
is working correctly.
The program should function in the
following way:
- complete opening of the air flap,
- preventilation for 30s,
- return to ignition position,
- 6-second electrode ignition,
- valves open,
- valves closed max 3 seconds after
opening,
- burner stops due lack of gas pressure
or control unit locks because flame
goes out.
If unsure, conduct the above test
again.
The unit can only be fired once this very
important operating sequence check
has been performed.
Firing
Warning:
The burner may be only fired when all
the requirements listed in previous
sections have been met.
• Connect a microammeter (scale 0 -
100 µA DC) in place of the measuring
bridge on the TC (check the polarity).
• Open the quarter-turn hand-operated
fuel valve.
• Close the thermostatic circuit.
The leak tightness test is switched on. At
the end of the test (30s), the unit is
switched on.
• Unlock the control and safety unit.
The burner is in service.
• Check the following:
- combustion as soon as flame
appears,
- any possible gas train leaks.
No leakage should be detected.
• Read the ionisation current (value
between 20 and 80µA inclusive).
• Measure the gas flow shown on the
counter.
• Raise the power to its nominal output
by activating the switch intermittently
S3+.
• Check combustion.
Comply with the smoke temperature
value recommended by the boiler
manufacturer in order to obtain the
required effective output.
According to the combustion tests, with
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the burner operating at the nominal flow
rate turn screw V on the MB VEF valve,
or screw R on the SKP regulator.
• To increase the CO
ratio and vice versa.
• Read the ionisation current (value
between 20 and 80µA inclusive).
• Measure the gas flow at the meter.
• Increase or reduce power by
increasing or reducing the value read
on the cam I graduated cylinder.
• Stop, then restart the burner.
• Check combustion as soon as the
flame appears.
According to the values measured, with
the burner operating, turn screw N on
the MB VEF valve, or screw D on the
SKP regulator.
• If necessary, adjust the cam III value
for ignition and the cam VI value for
minimum control.
Setting is performed in the same way
as for cam I.
• Return power to the nominal flow rate
and check the combustion
parameters.
If the value changes when screw N is
turned (screw D for the SKP), correct
the ratio V (R for the SKP) in the
desired direction.
• Obtain the best possible combustion
results by adjusting:
- the secondary air setting dimension
Y according to the procedure
described in the "Combustion
components and secondary air
head settings" section.
• Increase dimension Y: the CO
increases and vice versa.
A modification made to the Y
dimension can necessitate a
correction of the air flow.
• Check combustion.
• Check operation during the following:
firing, increasing and decreasing
power.
• With the burner in operation check the
leak tightness of the gas train
connections using foam designed for
this purpose.
No leakage should be detected.
• Check the safety devices.
Setting and checking the safety

devices

Gas pressure switch.
• Set it to the minimum distribution
pressure.
The burner is in service at the firing flow
stage.
• Slowly close the quarter-turn hand-
operated fuel valve.
The burner must stop due to a lack of
gas pressure.
05/2009 - Art. Nr. 4200 1017 4400A
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• Re-open the quarter-turn manual
valve.
The burner restarts automatically.
rate, increase the The pressure switch is set.
2
• Affix the cover and screw it on.
Air pressure switch.
The burner is operating at the firing flow
stage.
• Find the point where the air pressure
switch switches off (locking).
• Multiply the value read by 0.8 to obtain
the setting point.
• Restart the burner.
• Gradually block the air inlet.
• Check that the CO index is still below
10,000 ppm before resetting the
control unit.
If not, increase the air pressure switch
setting and repeat the test.
Leak testing device VPS :
• Open pa on the device.
• Restart the burner.
After 30s the device should enter safety
mode (red light on).
• Reclose pa.
• Unlock the tester safety catch by
pressing the red indicator.
The test cycle is relaunched.
The burner is in service.
• Check it is airtight.
• Disconnect the two wires on the
microammeter simultaneously.
The unit should reset itself immediately.
• Replace the measuring bridge and the
housings.
• Disconnect the measurement devices.
rate • Close the pressure taps.
2
• Unlock the unit.
The burner is in service.
• Check the following:
- the seal between the flange and the
boiler front,
- the opening of the control circuit
(limiter and safety),
- the current on the motor thermal
relays.
• Check the combustion under actual
operating conditions (doors closed,
etc.) and the circuit tightness.
• Record the results on the relevant
documents and give them to the
agent.
• Start-up automatic operation.
• Provide all the data required for proper
operation.
• Place the boiler room plate where it
can be easily seen.