28
Concord CXSD/H -
Installation & Servicing
SERVICING
43 CONTROL BOX - Basic Boiler, Exploded View
5.
Back panel.
6.
Controls box.
7.
Printed circuit board 'No. 35'.
8.
Ribbon cable.
LEGEND
1.
Wiring clamp.
2.
Connection box plug.
3.
Connection box.
4.
Printed circuit board 'No. 34'.
9.
Printed circuit board No. RTC/34.
10.
EMC Filter
11.Controls
box fascia (not shown).
45 PC BOARD ‘NO. 34’
44 CONTROL SENSOR
1.
Remove the casing top panel.
2.
Remove the sensor from the thermostat pocket in the
rear heat exchanger section by removing the Heyco
bush.
3.
Trace the lead back to the connector box behind the
control box. Release the connector box plug (Frame
43).
4.
Replace the sensor and reassemble in reverse order.
Ensure that the lead is rerouted along the casing in the
clips provided, and check that the sensor is correctly
fitted and secured in the thermostat pocket.
1.
Remove the lower front panel.
2.
Undo the 2 screws securing the control box front panel.
Carefully lift it up and lower it.
3
. Release the ribbon cable from PCB No. 34 by pushing the
retaining tabs sideways.
4.
Release all plug connections from the board.
5.
Remove the real time clock board (PCB No. RTC/34) from
PCB No. 34 by squeezing the 4 mounting pins and pulling
forwards.
6.
Release PCB No. 34 from the 9 plastic mounting pins and
replace the board.
7.
Re-assemble in reverse order.
SER
VICING
Con
1476
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Summary of Contents for Concord CXSD 40/H
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