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Greenstar combi installation requirements
Installation of the Greenstar combi boiler range must be
in accordance with the relevant requirements of the Gas
Safety (Installation Use) Regulations (as amended), current
IEE Wiring Regulations, local Building Regulations, Building
Standards (Scotland) regulations and bylaws of the local
water company and Health and Safety Document No. 635
(Electricity at Work Regulations 1989). It should also be
in accordance with the relevant recommendations of the
following British Standards:
BS 6798; EN 12828; BS 5546:1; BS 5440:1; BS 5440:2;
BS 6891; BS 7074; BS 7593.
Gas Safety (Installation and Use) Regulations state that all
gas appliances must be installed by a Gas Safe registered
person in accordance with the above regulations. Failure
to install appliances correctly could lead to prosecution.
The manufacturer's notes must not be taken in any way as
overriding statutory regulations.
Sealed primary systems
The Worcester Greenstar combi boilers are supplied
complete with all the necessary components to form a
sealed primary system. Included are an expansion vessel,
a pressure relief valve (set at 3bar), an automatic air vent
and a pressure gauge.
With an initial system pressure of 0.5bar, a system capacity
of approximately 83 litres can be accommodated. Refer to
BS 7074:Part 1 for more information.
It is important with an aluminium heat exchanger that the
pH level of the water does not exceed 8. Levels in excess of
this could be detrimental to the heat exchanger.
The use of a suitable inhibitor will provide a resistance to
this. Contact Sentinel (Tel: 0800 3894670 or visit
www.sentinel-solutions.net) or Fernox (Tel: 0870 601 5000
or visit www.fernox.com) for further details.
System fi lling and re-pressurising
Worcester Greenstar combi boilers are fi tted to a sealed
heating system which is pressurised. To maintain optimum
system pressure, two options may be used: an optional
Worcester integral fi lling link or external fi lling loop.
32
Optional Worcester integral fi lling link
The Worcester integral fi lling
link simply connects between
the cold main connection
and the heating return circuit
on the wall-mounting jig.
This feature is supplied as
standard with the Greenstar
CDi Classic and CDi Compact
and is available as an
accessory for the Greenstar Si Compact and i Junior
(part no. 7 716 192 281).
Worcester Keyless Filling Link
The optional Worcester
Keyless Filling Link is an
innovative accessory which
has been specially designed
to be directly connected to
a wall mounted Worcester
Greenstar combi boiler. Its
simple lever operation makes
system re-pressurisation easy for both the installer and
end user alike, and eliminates the problems caused
when a separate fi lling link or loop has been mislaid or
lost. For further details see pages 36 and 37
(part no. 7 716 192 610).
Valves and joints
It is very important that all valves and joints are able to
sustain a working pressure of up to 3bar (45psi). Particular
care should be exercised when fi tting radiator valves and
only those of high quality to BS 2767:10 should be used.
All other valves and fi ttings should comply with BS 1010.
Loss of water pressure from a sealed system will require
continuous recharging with fresh water and consequential
introduction of air. Air is highly corrosive and will
considerably reduce life expectancy of radiators, pumps etc.
Plastic pipework
The use of plastic pipework is acceptable. However, some
plastics are permeable to oxygen and must be avoided. Only
pipework with a polymeric barrier should be used. Please
note that the fi rst 600mm of pipework connected to the
boiler must be of copper or steel.
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