20
Concord CXA/H
- Installation and Servicing
SERVICING
4mm
Pilot burner
Pilot draught
shield
3 - 4mm
Spark gap
Flame detector
electrode
Spark
electrode
Main burner flame ports
Pilot and electrode positions
29 REPLACEMENT OF COMPONENTS - Refer to Frame 5
GENERAL
WARNING.
Always
turn
OFF
the gas supply at the gas
inlet cock and switch
OFF
and
DISCONNECT
the
electricity supply
BEFORE WORKING
on the appliance.
To facilitate the replacement of components, remove and
replace the lower front panel, NOx duct and the burner front
plate as necessary -described under ‘Servicing’.
28 SERVICING - continued
.
Refit the LH burner, ensuring that the flame detector lead is
properly connected. Reconnect both electrode leads at the
S4561B1054 PCB in the control box. Ensure the sleeving passes
through the strain relief clamp before refastening it.
Refit the centre and RH burners. Ensure that care is taken not to
damage the combustion chamber insulation and that the burner
front plate fits beyond the burner retaining returns when it is
refitted.
(CXA 120/H boiler only)
Refit collector hood baffles within collector hood using M5 securing
screws.
Refit the flue clean out cover, NO
X
ducts, control box door, casing
top and front panels.
TESTING AFTER SERVICING
After re-assembly, restore the electricity and gas supplies. Light the
boiler (refer to the Lighting and Operating Instruction Label on the
inside of the casing front panel) and check the gas connections for
tightness, as detailed under ‘Testing for Gas Soundness’ - Frame
20.
Check gas pressures and the gas rate; test as instructed in Frame
22 ‘Manifold Gas Pressure’ and 'Testing’. Adjust any time and
temperature controls to User’s requirements and remember to
reset any time control, which may have been switched off, to the
correct time of day. Refit the lower front panel.
1.
Remove the LH burner as previously described in
Frame 27
2.
Remove the 2 screws securing the control box front
panel, lift it and carefully lower it down.
3.
Remove the flame detector lead and the spark lead
connections from the S4561B1054 PCB in the control
box. Undo the strain relief clamp and pass the
sleeved wires through the grommetted hole in the
back panel.
4.
Remove the spark electrode by undoing the back nut.
Pull off the flame detector lead connection and
unscrew the electrode.
5.
Undo the pilot pipe connection and undo the 2
screws retaining the pilot burner and remove it.
6.
Fit the new pilot burner, ensuring that it faces towards
the front of the burner and that the pilot injector is in
position before connecting the pilot pipe.
7.
Reassemble in reverse order, ensuring that the
spark electrode lead passes through the sleeving
and that the sleeving passes through the strain relief
clamp in the control box before retightening.
30 PILOT BURNER ASSEMBLY
Pilot burner
Pilot draught shield
(Not fitted to CXA 120/H)
Fixing screw (2)
LH burner
Flame detector
electrode
Spark electrode
Backnut
Flame detector
lead
SER
VICING
Содержание Concord CXA 40/H
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