Worcester GREENSTAR 12i Instruction Manual page 46

F
E
D
46
REPLACEMENT OF PARTS
10
A
B
C
C
F
G
10.1
10.2
E
10.3
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System
REPLACEMENT OF PARTS
10. Replacing control
IMPORTANT:
Do not replace the control unit if a
CO/CO analyser is NOT available.
2
The control is supplied within its plastic
housing. The complete unit must be replaced.
Remove ALL electrical connections from
the control PCB including where cables run
through restraints. These can be unclipped
from the plastic moulding noting their
position.
C
Remove the code plug (B). The code plug
should be left attached to the frame of the
boiler by its plastic safety thread.
10.1 Remove the 3 screws (C) retaining the
front facia making sure to support the facia
when removing the last screw.
10.2 Using a suitable tool (D), press the button
(E) upwards and slide the control support
bracket (F) to the left.
10.3 Support the control and unclip control
support strap (G) from the boiler frame.
Remove the support strap and fit to the
new control.
Remove appropriate strap restraints from
the new control box.
Fit control to the boiler.
Re-connect support strap to the boiler and
all electrical connections to the new control.
NOTE:
After re-assembly, check the CO/CO
levels as described in the setting of the
air/gas ratio section.
IMPORTANT: ENSURE CODE PLUG
IS RE-FITTED TO THE NEW
CONTROL. IF THIS IS NOT DONE
THE BOILER WILL INDICATE
ERROR AND WILL NOT FUNCTION.
8 716 115 167b (03/2009)
2