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INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
27
INSTALLATION
CAUTION: ISOLATE THE MAINS
ELECTRICITY SUPPLY BEFORE STARTING
ANY WORK AND OBSERVE ALL
RELEVANT SAFETY PRECAUTIONS
Mains supply to the boiler must be through a
fused double pole isolator situated adjacent
to the appliance. The isolator must have a
contact separation of 3mm minimum in all
poles. External fuse rating 3A.
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 Unclip cable clamp (C).
4 Cut off the tapered cable entry to fit cable
diameter required.
5 Turn cable retaining screw (D) anti-clockwise.
Run cable over the main crossbar and
through the cable clamp (C), ensuring there
is ample cable to reach the connectors.
Turn cable clamping screw (D) clockwise to
secure cable.
After wiring to connectors is complete, snap
cable clamp (C) into control box.
6 Mains power 230v connection (ST10):
Separate wires from cable end and
strip to 6mm
Connect LIVE wire to terminal (L)
Connect NEUTRAL wire to the terminal (N)
Connect EARTH wire to the bracket
NOTE: Earth cable to be longer so that it pulls
out last if mains cable is snagged.
7 230V room stat/clock (ST10):
The diagram shows the option of roomstat with
programmer or roomstat only.
Remove link.
Connect LIVE supply to terminal (L
S).
Connect SWITCHED LIVE to terminal (LR),
NOTE: This is sometimes refered to as ‘call for
heat’ or ‘heating load’.
Connect NEUTRAL to terminal (NS).
NOTE: Some devices do not require this.
8 Optional external frost stat connection (ST6):
Connect froststat cables to terminals (FS) and
(FR). These are not polarity sensitive.
9 Refit panels.
3
C
4
5
D
6
7
8
F1
F3
F2
ROOMSTAT
ONLY
PROGRAMMER
ROOMSTAT
AND
PROGRAMMER
ROOMSTAT
230V
MAINS
SUPPLY
ST6ST10
earth
switched live
live
neutral
blue
green/yellow
brown
FROSTSTAT