Cuenod C 24 GX 507 T1 [14/48] Start up

Cuenod C 24 GX 507 T1 [14/48] Start up
02/2008 - Art. Nr. 13 019 866A14
Start-up
Working cycle test
Firing
Setting and checking of safety devices
Working cycle test
• Open, then immediately reclose fuel
quarter-turn hand-operated valve.
• Switch burner on.
• Close thermostatic circuit.
• Open the control unit and check if it is
working correctly.
Program sequence should be as follows:
- complete opening of the air flap,
- preventilation for 20s,
- return to ignition position,
- electrodes ignition for 3s,
- valves open,
- valves close no more than 3s after
opening,
- burner stops due lack of gas pressure
or control unit locks because flame
goes out.
If unsure, redo above test.
Unit can only be fired once this very
important working cycle test has been
performed.
Firing
Warning:
Burner may be only fired when all
the requirements listed in previous
sections have been met.
• Connect a microammeter (scale 0 to
100µA DC) in place of the measuring
bridge (check the polarity).
• Open fuel valves.
• Close thermostatic circuit.
• Release control unit.
Burner is in operation.
• Check the following:
- combustion as soon as flame
appears,
- any possible gas manifold leaks.
No leaks should be detected.
• Read ionisation current (value set from
10 to 25µA).
• Increase power to nominal flow rate.
• Check combustion.
Comply with recommended boiler
manufacturer smoke temperature value,
in order to obtain the required effective
output.
According to combustion value, with
burner working at nominal rate, turn
screw V on valve MB VEF:
• To increase CO
2
rate, increase the
ratio and vice versa.
• Read ionisation current (value set from
10 to 25µA).
• Measure gas flow at meter.
• Increase or reduce power by
increasing or reducing value read on
cam I graduated cylinder.
• Stop, then restart burner.
• Check combustion as soon as flame
appears.
According to measured values, with
burner in operation, turn screw N on
valve MB VEF:
• If required, adjust cam III value.
• Increase power to min. regulation flow.
• Check combustion.
• Adjust air/gas flow via cam IV for min.
regulation. Setting is performed in the
same way as for cam I.
• Return power to nominal flow rate and
check combustion parameters. If
value has changed after turning screw
N, adjust ratio V as appropriate.
• Optimize combustion results by
adjusting dimension Y (secondary
air), according to procedure described
in the “Setting combustion and
secondary air head” section.
• Reduce dimension Y, CO
2
index
increases and vice versa.
Any dimension Y modification may
require adjusting secondary air.
• Check combustion.
Check operation during the following:
firing, increasing and decreasing power.
• While burner is in operation and using
foam designed for that purpose, check
for any possible leaks in gas manifold
connections.
No leaks should be detected.
• Check safety units.
Setting and checking of safety
devices
Gas pressure switch
• Set it to the minimum distribution
pressure.
The burner is in service at firing flow
stage.
• Slowly close the fuel hand-operated
1/4 turn valve.
The burner must cease to function due
to a lack of gas pressure.
• Open the hand-operated 1/4 turn valve
again.
The burner restarts automatically.
The pressure switch is set.
• Fix, screw the cover.
Air pressure switch
The burner is in service at firing flow
stage.
• Detect the air pressure switch
switching off point (locking).
• Multiply the value read by 0.8 to obtain
the setting point.
• Stop, then restart the burner.
• Disconnect the gas measuring
instruments.
• Close the pressure taps.
• Unlock the unit.
The burner is in service.
• Check the tightness.
• Disconnect the two wires on the
microammeter simultaneously.
The unit must be locked immediately.
• Replace the ionisation bridge.
• Replace the covers.
• Unlock the unit.
The burner is in service.
• Check the tightness between the
flange and the boiler front wall.
• Check the combustion under
operating conditions (doors closed,
etc.) and the circuit tightness.
• Record the results on the relevant
documents and give them to the
agent.
• Switch the burner to AUTO.
• Provide all the data required for proper
operation.
• Affix the boiler house plate so that it be
apparent.

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