Checking The Ionization And Ignition Electrode; Checking The Ntc Position On The Flow And Return Pipes; Setting The Air/Gas Ratio - Worcester Greenstar 1000 GR1000W 24 C NG Installation And Maintenance Instructions Manual

▶ Remove the condensate hose [1] from the condensate trap [2].
Take care of water spillage during removal of condensate hose.
▶ Remove the condensate trap [2] by tilting right and left. Then move
upwards.
▶ Check for dirt particles inside the condensate trap, if necessary clean
with water.
▶ Put the condensate trap back into the fixation bracket.
▶ Reconnect the condensate hose.
9.10

Checking the ionization and ignition electrode

NOTICE
Risk of damage to the appliance
Damaging the burner tube will lead to improper operation.
▶ Do not lay burner door on its cylindrical burner tube.
▶ Check the distance between the ignition electrode and the burner.
The distance [d1] should be 5 ± 1 mm and [d2] should be 10 ±
3 mm, if outside replace it (Chapter 10.4, page Disassembly of
the ignition electrode on the burner door)
▶ Replace electrodes subject to the measurement results.
▶ Check the ionization and ignition electrode for contamination or wear
and replace it if necessary.
Fig. 86 Checking the ionization and ignition electrode
Greenstar 1000 – 6721835943 (2023/08)
d2
d2
d1
0010043106-001
9.11 Checking the NTC position on the flow and return
pipes
Don't place the NTCs on the bends of the flow and return pipes.
Fig. 87 NTC positions
▶ Both NTCs must be at the positions shown and on the straight section
of the pipes.
9.12

Setting the air/gas ratio

NOTICE
Setting the air/gas ratio
▶ The air/gas ratio is factory set and should not need to be adjusted. If
found to be out of tolerance and when all other possible causes have
been checked, please contact the Worcester Bosch Group helpline
0330 123 3366.
NOTICE
Combustion testing
▶ The checking of the air/gas ratio must be carried out by a competent
registered gas engineer, such as a Gas Safe registered engineer or
British Gas engineer.
▶ Checking of the air/gas ratio must not be attempted unless the
person carrying out the test is equipped with a flue gas analyser
conforming to BS7927 and is competent in its use.
All CO/CO readings must be taken with the combustion chamber cover
2
ON.
Adjustments can only be made with the cover off.
CO should be measured 10 minutes after firing the appliance.
2
Inspection and maintenance
0010046028-001
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