To Clean The Heat Exchanger - Worcester 29CDi Classic Installation, Commissioning And Servicing Instructions

SERVICING AND SPARES
▶ Press and HOLD the Performance test button (J) for 10 seconds and
set Central Heating temperature to maximum.
– The Performance test button will illuminate continually.
– The boiler will stay in this mode for 15 minutes unless the
Performance test button is pressed again.
▶ Pull the cover off and connect a manometer to the fan pressure test
point.
▶ After measurement replace test point cover.
FAN PRESSURE TEST
Clean the Heat Ex.
NG Boilers
42 CDi:
38 CDi:
34 CDi:
- 3.9
29 CDi:
0 -1 -2 -3
LPG Boilers
42 CDi:
38 CDi:
34 CDi:
29 CDi: - 3.9
0 -1 -2 -3
Fig. 64 Fan pressure readings
• Pressures readings in the black area will indicate that the heat
exchanger requires attention/cleaning.
• There is a special accessory kit available specifically designed for
cleaning the heat exchanger.
Part number 7 719 001 996.
Fig. 65 Fan pressure test point
40
Heat Ex. ok
- 4.8
- 4.4
- 5.3
-4 -5 -6 -7 -8
mbar
- 4.8
- 4.4
- 5.3
-4 -5 -6 -7 -8
mbar
3.
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NOTICE: Air/Gas ratio
▶ After servicing the CO/CO
the procedure in the section "Setting the air/gas
ratio" on page 42.
▶ The setting of the air/gas ratio must be carried out by
a competent person.
Setting the air/gas ratio must not be attempted
unless the person carrying out the operation is
equipped with a combustion analyser conforming to
BS 7927 and is competent in its use.
6.1.4

TO CLEAN THE HEAT EXCHANGER

▶ Remove outer case and base panel and isolate the appliance from
power.
1. Remove cleaning access cover (B), seal (C) and metal plate (D)
securing it, if present.
1.
B
Fig. 66 Cleaning heat exchanger
2. Loosen any deposits in the heat exchanger from top to bottom using
the cleaning blade.
2.
must be checked using
2
D
C
6720803599-11.1Wo
6720803599-03.1Wo
6 720 815 725 (2015/05)