Instruction manual

ELECTRICAL
CAUTION: ISOLATE THE MAINS
ELECTRICITY SUPPLY BEFORE STARTING
ANY WORK AND OBSERVE ALL
RELEVANT SAFETY PRECAUTIONS
The boiler is pre-wired with a two metre
mains supply cable.
A spare strain relief block is supplied in case
the pre-wired cable is not used.
The mains supply to the boiler must be either:
• from a fused double pole isolator situated
next to the appliance. The isolator must
have a minimum of 3mm contact separa-
tion in both poles.
or
• from a plug and non-switched socket
Use a 3A fuse in both situations.
When stripping wires always ensure copper
strands do not fall into the control box.
Access to electrical connections:
Remove boiler casing to access control panel.
1 Unscrew screw (A) and lower the control
box into the horizontal position.
2 Unscrew the three screws (B) in the control
panel and pull off the connections cover.
3 Pass the 230 V mains power cable, from the
control box, through the grommet at the
right hand side of the pre-plumbing manifold
and route to the mains isolator next to the
boiler.
4 System wiring centre connection (ST10):
 Remove link.
 Connect the LIVE feed wire from terminal (L
S)
to the LIVE on the system wiring centre.
 Connect NEUTRAL wire from terminal (NS) to
the neutral on the system wiring centre.
 Connect SWITCHED LIVE wire from terminal
(LR) to the boiler demand on the system wiring
centre.
Note: A pump is fitted in the boiler.
There should be no other pump fitted.
5 Refit panels.
NOTES:
• External diverter valve(s) and all other 230V
parts are not supplied with the boiler.
• A fascia mounted programmer/timer cannot be
fitted unless optional integral diverter
valve is used (see instructions at the rear of
this manual).
• Refer to manufacturers instructions when
connecting external parts to the wiring centre.
Worcester, Bosch Group cannot be held
responsible for wiring errors.
• There is an option to fit an internal diverter
valve. This also requires fitting an extra
harness and a code plug change. See
“Optional Diverter Valve” Section in these
instructions or the instructions supplied with
the integral diverter valve kit.
This option is also covered in the Fault
Finding Guide on page 55 of these instructions.
4
F1
F3
F2
SYSTEM
WIRING
CENTRE
230V
MAINS
SUPPLY
ST10
earth
switched live
live
neutral
blue
green/yellow
brown
TIMER ROOMSTAT TANKSTAT WATER VALVE(S) FROSTSTAT
boiler
demand
2
A
1
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System
8 716 115 167b (03/2009)
29
ELECTRICAL
INSTALLATION
3
B