Worcester GREENSTAR HIGHFLOW 440CDi Instruction Manual page 47

C
A
L
B
INSTALLATION & SERVICING INSTRUCTIONS
8 716 115 219c (03.2010)
D
E
F
G
H
J
K
REPLACEMENT PARTS
Electrode assembly:
Switch off the master switch.
Isolate appliance from the power supply.
Move control panel into service position.
Release 4 screws to remove inner case
door.
Remove the leads from the electrodes.
Unscrew the two fixing screws (B) and
carefully remove the electrode assembly (A).
Replace and re-connect the assembly
taking care not to mislay the inspection
window.
After re-assembly check CO/CO
as described in the section "Setting the
air/gas ratio".
Burner:
NOTE: On re-assembly, replace the seal
Check that the gas cock is turned off and
the master switch is in the OFF position.
Isolate appliance from the power supply.
Remove the clips (C) and unscrew the
two bolts (L).
Remove springs.
Unscrew and remove the 2 hexagon
screws (D) securing the fan.
Slacken fully the rear securing nut (E).
Remove the burner coverplate (F).
Remove the burner skin (G).
Re-assemble the new burner in reverse
order, inspect the new seal (H) for damage
and replace if necessary.
After re-assembly check CO/CO
as described in the section "Setting the
air/gas ratio".
Primary heat exchanger:
Isolate appliance from the power supply.
Turn off all isolation valves.
Drain down appliance.
Move control and pressure vessel into
service position. To improve access, remove
the pressure vessel.
Remove inner case door.
Remove fan assembly, burner, gas mixing
tube.
Disconnect and remove sensors
connected to heat exchanger.
Remove condensate trap.
Remove internal flue elbow and tube
from boiler sump.
Disconnect return pipe union (J) at the
base of the boiler heat exchanger.
Disconnect flow pipe connection.
Remove plastic nut (K) from the base of
the inner casing.
Remove heat exchanger from inner casing.
Ensure heat conductive paste is used on
sensors when refitting.
After re-assembly check CO/CO
as described in the section "Setting the
air/gas ratio".
REPLACEMENT PARTS
levels
2
levels
2
levels
2
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