SERVICING AND SPARES
6 720 812 175 (2014/07)
38
Fig. 60 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. 61 Fan pressure test point
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.
Fig. 62 Cleaning the heat exchanger
2. Loosen any deposits in the heat exchanger from top to bottom using
the cleaning blade.
Fig. 63
3. Clean the heat exchanger from top to bottom using the brush.
6 720 812 175-39.1O
FAN PRESSURE TEST
Clean the Heat Ex.
Heat Ex. ok
NG Boilers
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
30 CDi:
35 CDi:
- 3.9
- 5.3
LPG Boilers
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
30 CDi:
35 CDi:
- 3.9
- 5.3
6 720 812 175-35.1O
NOTICE:
Air/Gas ratio
▶ After servicing the CO/CO
2
must be checked using
the procedure in the section “Setting the air/gas ratio”
on page 40.
▶ 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 conversion is equipped
with a combustion analyser conforming to BS 7927
and is competent in its use.
B
C
D
1.
6 720 812 175-30.1O
2.
6720803599-03.1Wo