30
Concord Super Series 4 -
Installation & Servicing
Re-assembly of the module after water tube cleaning
TAKE CARE:
1.
The triangular lugs on the cover plates are in register with
the corresponding lugs on the header castings - refer
Frame 28.
2.
NEW gaskets should be used between mating flanges.
3.
Tighten the securing bolts EVENLY to a torque of 20 N/m
(15 f/lbf).
Re-assembly can then be continued
as detailed in the foregoing section.
REPLACEMENT OF COMPONENTS
WARNING -
Before working on the appliance:
1.
Isolate the boiler electrical supply.
2.
Turn OFF the gas supply at the inlet gas cock.
Note.
To replace the following components it will be
necessary to remove the module cover as previously
described in the Servicing Instructions.
It may also be necessary to open the control panel front and/
or rear doors to gain access - refer to Frame 19.
Sight Glass
1.
Undo the two screws securing the sight glass assembly
to the front header casting.
2.
Fit the replacement sight glass, ensuring the parts are in
the correct order, i.e., gasket, glass, gasket and frame.
3.
Re-tighten the two screws to ensure an airtight seal.
DO NOT OVERTIGHTEN.
Boiler adjustable Control Thermostat Sensing Probe
1.
Remove the retaining clip from the thermostat pocket in
the boiler return header and withdraw the sensing probe.
2.
Unplug the thermostat lead from printed circuit board No.
28 behind the front control panel door and withdraw the
lead.
3.
Fit the replacement probe in reverse order.
Boiler Adjustable Control Thermostat Potentiometer
1.
Unplug the potentiometer lead from the printed circuit
board No. 28, behind the front control panel door.
2.
Loosen the retaining screw of the thermostat control knob
on the right-hand side of the fascia and pull off the knob.
3.
Undo the hexagon nut securing the potentiometer to the
fascia and withdraw the potentiometer.
4.
Fit the replacement potentiometer in reverse order.
Printed Circuit Board No. 28
1.
Release the front panel control door.
2.
Unplug all the push-on terminals from the board.
3.
Release the board from the PCB stand-offs by
depressing the tabs and withdrawing the board.
4.
Fit the replacement board in reverse order.
Printed Circuit Board No. 29 (complete with black box)
1.
Release the front and rear control panel doors together.
2.
Unplug the push-on terminal strip at the right-hand side
and the spark electrode lead.
3.
Undo the four screws securing the black box complete.
4.
Fit the replacement box in reverse order.
Safety Temperature Limiter
1.
Pull out the split pin & remove the phial & its metal
retainer from its pocket in the flow elbow - refer to Frame
15.
2.
Release the capillary from the edge clip.
3.
Unscrew the two screws securing the control cover plate
and remove the plate - refer to Frame 23.
4.
Pull off the two electrical connections from the safety
temperature limiter.
5.
Fit the replacement device in reverse order, ensuring the
capillary is routed above and behind the fan and secured
in the edge clip.
SERVICING AND FAULT FINDING
Summary of Contents for Concord Super Series 4 100 V
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