Worcester GREENSTAR HIGHFLOW 440CDi Instruction Manual page 40

D
C
A
38
INSPECTION & SERVICE
J
F
INSPECTION & SERVICE
SERVICE INSPECTION:
1 Grip the outer sides of the front panel
(A) pull and lift away from retaining lugs
G
(B).
2 Remove retaining screw (C) to swing
control panel assembly (D) outwards to
its full extent.
H
3 Pull clip (E) outwards to release
expansion vessel (F).
4 Swing expansion vessel (F) outwards.
Note: for easier access to the inner case, the
expansion vessel can be unhooked (by
removing the retaining screw on the hinge)
lowered and moved to the side. Take care
not to overstretch the flexible pipe
connections.
5 Release four screws (G) to remove the
inner case cover (H).
B
Connect a manometer to the fan pressure
E
test point (see step 1 in figure on next
page).
After measurement replace test point
cover.
Pressure readings will be negative, refer
to chart below.
FAN PRESSURE TEST
NG Boilers
HF 550 CDi:
HF 440 CDi:
LPG Boilers
HF 550 CDi:
HF 440 CDi:
Pressure readings in the black area indicate
that the heat exchanger requires cleaning.
Check that the terminal and terminal guard,
if fitted, are clear and undamaged.
If the appliance is in a compartment or
cupboard check that the specified service
space around the appliance is clear.
See 'Boiler Location & Clearances' under the
Pre-Installation section for compartment
clearances.
Check all the joints and connections in the
system and remake any that show signs of
leakage. Refill and re-pressurise the system.
See 'Filling the System' and 'Water Treatment'
under the Commissioning section.
Operate the appliance and take note of
any irregularities. Call up the last fault
stored by the Bosch Heatronic, Service
Function '6A'.
Refer to 'Fault Finding' under the Fault Finding
& Diagrams section for display codes and
rectification procedures.
INSTALLATION & SERVICING INSTRUCTIONS
8 716 115 219c (03.2010)
Clean Heat Ex. Heat Ex. ok
- 5.2
- 4.1
-1 -2 -3 -4 -5
mbar
- 5.2
- 4.1
-1 -2 -3 -4 -5
mbar
-6
-6