Electrics - Worcester GREENSTAR 24i junior Instruction Manual

1
A
ROOMSTAT
PROGRAMMER
ST10
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 115 166b (03/2009)
ROOMSTAT
ONLY
4
ROOMSTAT
AND
PROGRAMMER
230V
MAINS
SUPPLY
F1
F3
F2

ELECTRICS

2
CAUTION: ISOLATE THE MAINS
B
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:
•
or
•
Use a 3A fuse in both situations.
When stripping wires always ensure copper
strands do not fall into the control box.
3
Access to electrical connections:
Remove boiler casing to access control panel.
1 Unscrew screw (A) and lower the control
2 Unscrew the three screws (B) in the control
5
3 Pass the 230 V mains power cable, from the
FROSTSTAT
4 230V room stat/clock (ST10):
ST6
5 Optional external frost stat connection (ST6):
6 Refit panels.
from a fused double pole isolator situat-
ed next to the appliance. The isolator
must have a minimum of 3mm contact
separation in both poles.
from a plug and non-switched socket
box into the horizontal position.
panel and pull off the connections cover.
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.
The diagram shows the option of roomstat
with programmer or roomstat only.
Remove link.
Connect room stat LIVE supply to terminal (L
Connect room stat LIVE return to terminal (L
NOTE:This is sometimes referred to as 'call for
heat' or 'heating load'.
Connect room stat NEUTRAL to terminal (N
NOTE: Some devices do not require this.
Connect froststat cables to terminals (FS) and
(FR). These are not polarity sensitive.
ELECTRICS
)
S
)
R
)
S
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