23
Concord CXS -
Installation & Servicing
LEGEND
1.
Main gas inlet cock.
2.
Gas inlet union.
3.
Gas control valve.
4.
'O' ring seal.
5.
Spark generator.
29 GAS CONTROL VALVE
SERVICING
31 BURNER AND CONTROLS ASSEMBLY - Exploded View - CXS 40 - 90
30 MAIN BURNER
1.
Disconnect the electrical connections to the faulty gas
valve.
2.
Turn the gas inlet cock OFF and unscrew the 4 screws
on the outlet flange then unscrew the 4 screws on the
inlet flange.
CXS 90 -120 only -
loosen the other 4 screws on the inlet
flange securing the other gas valve.
3.
Fit the new valve and reassemble in the reverse order,
ensuring that the arrow on the back of the valve points in
the direction of the gas flow and that new 'O' ring seals
are correctly placed in each flange connection.
4.
Test for gas soundness.
5.
Recommission the appliance and set the manifold
pressures as described in Frames 22 and 23 or 24.
1.
Remove the NOx duct and burner front plate, as
previously described in Frame 26.
2.
On the
CXS 40, 50 & 60
remove the screws holding the
HT heat shield from the LH leg of the combustion
chamber. Raise slightly and withdraw the heat shield,
taking care not to damage the leads.
3.
Each burner can be removed by sliding back, to clear the
injector, then lifting out. Disconnect the ignition leads
from the LH burner and the detection lead from the RH
burner.
4.
Remove the 2 screws securing the electrode assembly
and heat shield to the LH burner bracket and the 2
screws securing the detection electrode bracket to the
RH burner.
5.
Reassemble in reverse order.
IMPORTANT.
Care must be taken to prevent damage to the
combustion chamber insulation when replacing burners.
6.
Burner manifold.
7.
Main injector, 3 off.
8.
Main burner (centre/RH), 2 off.
9.
Main burner (LH), 1 off.
10.
Ignition electrodes.
11.
Overheat thermostat generator mounting bracket.
12.
Overheat thermostat.
13.
Detection electrode assembly.
14.
HT leads heat shield.
15.
Gas pipe.
PTP
Pressure test point.
SER
VICING
