24
Concord CX
- Installation
SERVICING
LEGEND
1.
Overheat thermostat
2.
Piezo spark generator
3.
Gas inlet union
4.
Main gas inlet cock
5.
Gas control valve
6.
Main (end) burner, 2 off
7.
Main (centre) burner, 1 off
8.
Main injector, 3 off
9.
Gas inlet manifold
10.
Pilot gas pipe
11.
Overeat thermostat/piezo
generator mounting bracket
12.
'O' ring seal
13.
Thermocouple
14.
Spark electrode
15.
Pilot draught shield
16.
Pilot burner
PTP
pressure test point
SER
VICING
34 GAS CONTROL VALVE
1.
Undo the thermocouple and pilot gas pipe
connections at the gas control valve. Disconnect
the interrupter leads to the overheat thermostat.
2.
Undo the screw securing the plastic electrical cover
on the gas valve and lift it off.
3.
Undo the earth connection and pull off the 2
connectors to the gas valve, taking care not to lose
the small earth screw and washer.
4.
Check that the gas inlet cock is OFF, unscrew the 4
screws on the gas valve inlet flange, the 4 screws
on the outlet flange and remove the valve.
5.
Replace the gas control valve and re-assemble in
reverse order, ensuring that the arrow indicating the
direction of flow is in the correct position and that
the overheat thermostat connections are in place
on the gas valve before reconnecting the
thermocouple.
6.
Ensure that a new ‘O’ ring seal is correctly placed in
each flange connection.
7.
Test for gas soundness.
35 MAIN BURNER
1.
Remove the NOx duct and burner front plate, as previously
described in Frame 27.
2.
Both left and right hand burners can be removed by sliding
each one back to clear the injector, and then lifting out.
3.
To exchange the centre burner disconnect the pilot pipe and
thermocouple connections at the gas valve and pull off the
igniter lead at the igniter. Withdraw the burner by sliding it
back to clear the injector then lift it out.
4.
Remove the pilot shield. Undo the backnut retaining the
electrode and remove the electrode.
5.
Remove the 2 screws securing the pilot burner assembly to
the pilot burner bracket. Undo the thermocouple and pilot
gas pipe connections at the pilot burner assembly and
CAREFULLY remove the pilot burner.
6.
To replace the centre burner; refit the pilot burner, pilot
draught shield, pilot pipe, thermocouple and electrode in
reverse order, taking care not to damage the electrode.
Note.
Ensure that the pilot burner is correctly fitted, i.e. the
thermocouple is toward the front, and that the pilot injector
has not been omitted.
7.
Refit the burner to the appliance. Reconnect the pilot gas
pipe igniter lead and thermocouple to the gas valve,
ensuring that the overheat thermostat connections are in
place before tightening the thermocouple connection.
DO NOT OVERTIGHTEN.
IMPORTANT.
Care must be taken to prevent damage to the
combustion chamber insulation when replacing burners.
36 BURNER AND CONTROLS ASSEMBLY - Exploded View CX 40 - 60
Summary of Contents for Concord CX40
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