ACV 50 - Disassembling the Burner

EN • 21
ENGLISHFRANCAISNEDERLANDSESPAÑOLITALIANODEUTSCH
664Y3000.A
COMMISSIONING AND MAINTENANCE
DISASSEMBLING THE BURNER
- Close the inlet gas valve.
- Disconnect the electrical power supply.
- Remove the front panel of the boiler.
- Unplug the fan plugs (PWM & 230V), the ignition cable, the
gas valve control and the ignition electrode earth.
- The upper jacket panel is removable for an easier access.
- Loosen the burner nuts using a ratchet wrench.
- Unscrew the three-way coupling on the gas pipe.
- In one unit, lift up the burner with the fan and the gas valve to
remove them from the exchanger. Be careful not to damage
the burner insulation in the exchanger.
- Check the condition of the insulation and the seals and replace
them if necessary before re-assembling the burner following
the same procedure but in the reverse order.
DISASSEMBLING THE EXCHANGER
- Drain the water from the central heating system using the
connection under the appliance.
- Allow the appliance to drain completely.
- Dismantle the electrical connections downstream from the
burner, as well as the NTCs.
- Dismantle the exchanger central heating flow pipes and
return pipes. Exercise caution when dismantling the parts as
residual water may escape from the exchanger.
- Dismantle the connection at the siphon and remove the nut
between the siphon and the exchanger.
- Lift up the exchanger in one piece standing upright. The
exchanger detaches from its hook and is fully released.
- Check the condition of the seals and replace them if necessary
before re-assembling the heat exchanger following the same
procedure but in the reverse order.
CLEANING THE HEAT EXCHANGER
- Remove the burner assembly as described above.
- Remove the burner gasket.
- Clean the combustion chamber using a vacuum cleaner.
- Disconnect the flue pipe from the exchanger.
- Check if the condensates collector is clean, if necessary,
clean it.
- Check the burner insulation and the burner gasket; replace
the parts if necessary.
- Check the igniter, replace if necessary
- Reassemble the burner and check for leakages.
- Power up the appliance, set the boiler in full power mode and
recheck for leaks.
- Check the gas pressure and the CO2 level as explained in
previous paragraf.
TEMPERATURE SENSOR RESISTANCE TABLES
T° [°C] R Ω T° [°C] R Ω T° [°C] R Ω
- 20 98200 25 12000 70 2340
- 15 75900 30 9800 75 1940
- 10 58800 35 8050 80 1710
- 5 45900 40 6650 85 1470
0 36100 45 5520 90 1260
5 28600 50 4610 95 1100
10 22800 55 3860 100 950
15 18300 60 3250
20 14700 65 2750
DISASSEMBLING AND CHECKING THE ELECTRODE
- Remove the ignition cable.
- Remove the two fixing screws.
- Remove the electrode earth but make sure the serrated
washer is fixed between the earth cable and the electrode
when re-assembling.
- Check the condition of the seals and replace them if necessary
before re-assembling the electrode following the same procedure
but in the reverse order.
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