Combustion And Rate Checks - Baxi Ecogen 24/1.0 Installation & Servicing Instructions Manual

Gaskets
Igniter
Electrode
Fig. 53
Igniter Plug
Ignition
Electrode
Lead
Electrode Leads
Burner Door
Nuts
Flame Sense
Lead
60
© Baxi Heating UK Ltd 2012
Sensing
Electrode
Fig. 54
Fig. 55
13.4
1. Perform combustion and rate checks by using the chimney
sweep mode to force each burner into maximum rate (see
section 15.0 Combustion Checks). Combustion reading of
CO
both burners. Measure the CO/CO
less than 0.004.
2. Set each burner separately to a minimum and check that the
burner stays lit with clean combustion.
3. If there is a problem with the rate or combustion see Section
15.2.
4. If there is a problem with the ignition, the following servicing
should be carried out.
See SAFETY NOTE Section 13.3
Engine Ignition and Flame Sensing Electrodes (Fig. 53)
1. Detach the ignition and flame sense leads from the wiring
harness noting their positions.
2. Undo the long nuts (7mm spanner) retaining the engine
ignition and flame sense electrodes.
3. Carefully withdraw the electrodes from the engine.
4. Examine and clean or replace the electrodes as necessary. The
spark gap should be 3.5 - 4.0 mm, adjust the earth pin if required
(Fig. 54).
3.5 - 4.0mm
5. Always use the new gaskets provide when replacing the
electrodes.
6. Replace in the reverse order.
Supplementary Burner and Heat Exchanger, Igniter and Flame
Sensing Electrodes (Fig. 55)
1. Detach the supplementary Igniter plug.
2. Detach the flame sense lead from the wiring harness.
3. Remove the four M5 screws at the right of the supplementary
air gas manifold.
4. Undo the six nuts around the burner door perimeter noting
the position of the earth lead.
5. Carefully with draw the burner door and manifold.
6. Clean any debris form the heat exchanger and check that the
gaps between the tubes are clear.
7. Inspect the burner, insulation and the electrodes, clean or
replace if necessary. Reset the electrode spark gap to between
3.5 – 4.0 mm by adjusting the earth pin if required (Fig. 54).
8. If it is necessary to replace electrodes always use the gaskets
provided.
9. Reassemble in the reverse order remembering to attach the
M4 Screw
earth wire.
Complete the relevant Service Interval Record section of the
Benchmark Commissioning Checklist at the rear of this
publication and then hand it back to the user.
13.0 Servicing
Servicing – Combustion and Rate Checks
~ 8.7 – 9.3 and CO less than 100 ppm are acceptable for
2
2
ratio. This valve must be