Technical data

SERVICING AND SPARES
6 720 648 547 (2012/06) 35
6.1.1 FAN PRESSURE TEST
SET THE BOILER TO MAXIMUM
Fig. 52 Control panel
▶ Press and HOLD performance test button (L) 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.
Fig. 53 Fan pressure test point
• Pressure 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. 54 Fan pressure readings
6.1.2 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. 55 Cleaning the heat exchanger
This test is to determine if the heat cell requires cleaning/
attention
The boiler must operate at maximum output for the Fan
Pressure test and Flue Gas Analysis.
A On/off button
B On/off and fault indicator (BLUE)
C Central heating temperature control
D Burner indicator (GREEN)
E Reset button
F Service button
HNot used
KDisplay
L Performance test button
MNot used
1
2
3
4
5
6
max
reset
eco
6720648547-49.1Wo
A
E
H
M
D
L
F
K
B
C
2.
6720648547-21.1Wo
NG Boilers
FAN PRESSURE TEST
Clean the Heat Ex.
Heat Ex. ok
LPG Boilers
0
-6
-5
-4
-3
-2-1
-8
-7
mbar
0
-6
-5
-4
-3
-2-1
-8
-7
mbar
30 CDi:
40 CDi:
- 4.1
- 5.2
30 CDi:
40 CDi:
- 4.1
- 5.2
6720648547-26.1Wo
B
C
D
1.
6720803599-02.1Wo