© MHG Heating Ltd
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MHG Heating Ltd, Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey, KT20 5LR
0845 6448802 Telephone. 0845 6448803 Fax. Email
Website www.mhgheating.co.uk
010310 Draft
9.1 Expansion Vessel
In accordance with BS 6644: 2005, WRAS Regulations, and Local Authority Water Regulations, as
applicable, the installer shall install a suitably sized, and approved, Expansion Vessel to ensure that the
water capacity of the system has ample expansion capacity.
The location of the expansion vessel shall only be isolatable from the system via a Lockable Type
Service Valve, which shall be locked in the
OPEN
position, to prevent accidental isolation.
Furthermore, a drain facility should be provided adjacent to the expansion vessel to aide the routine
maintenance, overhaul, of the vessels Air Pressure setting.
For information on a comprehensive range of expansion vessels that comply with current British
Standards and WRAS Regulations, please contact MHG Heating Ltd Sales.
10.0 System Water Quality
Water Treatment, System Cleaning (BS 7592: 2006)
The entire primary system MUST be thoroughly cleaned and flushed to remove debris, flux residues,
etc. before opening the boiler isolation valves & flooding the boiler. Particular care must be taken
where the ECOSTAR 500 boiler is being retro-fitted into an old/existing system, as system silt or
magnetite can be very damaging to the new boiler.
Following cleaning and flushing the system MUST be dosed with a good quality water treatment to
prevent corrosion and the formation of scale. FAILURE TO OBSERVE THESE REQUIREMENTS WILL
RENDER THE WARRANTEE ON THE APPLIANCE VOID.
Cleaning, flushing and water treatment must be carried out in accordance with the requirements of BS
7593:1992, prior to commissioning the boiler.
Repeated draining and refilling of the system, without replenishment of water treatment, must be
avoided, as this is very damaging to the boiler. The boiler must not operate without the system water
being correctly and adequately treated, and maintained, with an appropriate level of corrosion
inhibitor.
For specific guidance on water treatment, direct contact is advisable with:-
Betz Dearborn Limited
(Sentiel)
Foundry Lane
Widnes
Cheshire
WA8 8UD
Tel: 0151 424 5351
Fax: 0151 420 5447
Alpha-Fry
Technologies
(Fernox)
Cookson Electronics
Forsyth Road
Sheerwater
Woking
Surrey
GU21 5RZ
Tel: 0208 665 6666
Fax: 0208 665 4695
