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MAINS SUPPLY
ELECTRIC SUPPLY:
• Supply: 230V - 50Hz, 140 watts
• Cable: PVC insulated 0.75mm
2
(24 x 0.2mm)
temperature rated to 90°C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• IPX4D. NOTE: this is reduced to IP20 if the
following mechanical timers are fitted:
7 716 192 036 or 7 716 192 037.
• All pipes to the boiler must be cross-bonded.
• Wiring must comply with IEE wiring regulations.
GAS SUPPLY:
• Boilers using NG must be connected to a
governed meter.
• LPG boilers must be connected to a
regulator.
• Installation and connection of the gas supply
to the boiler must be in accordance with
BS6891.
• Under no circumstances should the size of
the gas supply pipe be less than that of the
appliance inlet connection.
• The meter or regulator and pipework to the
meter must be checked, preferably by the gas
supplier, to ensure it is in good working order
and can meet the gas flow and pressure
requirements in addition to the demand from
any other appliance being served.
WATER SUPPLY:
Water mains pressure:
• Minimum mains water pressure 1.3 bar for
maximum performance.
• Maximum mains fed water pressure 10 bar.
If necessary, fit a pressure reducing valve.
• Where the mains water supply has a non-
return, back flow prevention valve fitted, a
mini expansion vessel (A) should be connect-
ed to the mains water inlet pipe (B) between
the non-return valve (C) and the boiler (D) as
shown opposite.
Use in hard water areas:
Normally there is no need for water treatment to
prevent scale formation as the maximum tem-
perature of the DHW heat exchanger is limited
in the electronic circuit.
In areas where temporary water hardness
exceeds 200ppm, consideration may need to
be given to the fitting of a scale prevention
device. In such circumstances, the advice of
the local water authority should be sought.
IMPORTANT: Non-return, back flow pre-
vention devices (including those associ-
ated with water meters) fitted to the
mains water supply can cause a pres-
sure build up which could damage the
boiler and other household appliances.
MAINS SUPPLY
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
9
PRE -
INSTALLATION
MAINS WATER EXPANSION VESSEL:
A - Mini expansion vessel, part No. 7 716 102 105
B - Mains water inlet
C - Non-return valve
D - Boiler
A
B
C
D