SERVICING AND SPARES
6 720 803 599 (2012/06)
36
6.1.2 FAN PRESSURE TEST
SET THE BOILER TO MAXIMUM
Fig. 47 Control panel
[A]
ON/OFF button
[B] Cover or optional plug-in controller
[C] Display
[D] System pressure gauge
[E]
Reset button
[F]
ECO button
[G] Holiday button
[H] DHW temperature control
[I]
Central heating control
[J]
Performance test button
[K]
Service button
[L]
Burner indicator (green)
[M] ON/OFF and fault indicator (blue)
B
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.
B
Pull the cover off and connect a manometer to the fan pressure test
point.
B
After measurement replace test point cover.
Fig. 48 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. 49 Fan pressure test point
This test is to determine if the heat cell requires cleaning/
attention
B
When running in the Performance test mode, the
boiler will operate only the Central Heating circuit.
B
The heating output can be limited to any level between
minimum and maximum rated heat output to suit a
specific requirement.
Even when the heat output is limited, full heat output
is still available for domestic hot water.
1
2
3
4
5
6
max
2
3
1
0
4
bar
1
reset
eco
1
2
3
4
e
6
max
min
A
J
B
K
C
L
D
M
E
F
G
H
I
6720647361-23.2Wo
6720803599-01.1W
o
FAN PRESSURE TEST
Clean the Heat Ex.
Heat Ex. ok
NG Boilers
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
38 CDi:
42 CDi:
29 CDi:
34 CDi:
- 4.4
- 4.8
- 3.9
- 5.3
LPG Boilers
0
-6
-5
-4
-3
-2
-1
-8
-7
mbar
38 CDi:
42 CDi:
29 CDi:
34 CDi:
- 4.4
- 4.8
- 3.9
- 5.3
3.
6720647361-28.1Wo
