© MHG Heating Ltd
22
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web www.mhgheating.co.uk
010517
9.1 Expansion Vessel
In accordance with BS 6644: 2011, 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 aid 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.
9.1System 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
Wallcon 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:-
9.2 Care With The Use of Solder Flux
The Wallcon range has heat exchangers fabricated from Stainless Steel. It is most important that the
compatibility of any flux is checked with the supplier before use, and that any flux manufactures
recommendations are strictly followed with regards to use in conjunction with Stainless Steel.
If you are applying any of the Wallcon Range to a system where the water quality cannot be cleansed or
treated please consider installing a system separation plate heat exchanger to ensure absolute separation of
the system water and the boiler water.
Please refer to our website for further details on our matched brazed and gasketed plate heat exchanger
range.
Fernox
2 Genesis Business Park
Albert Drive
Sheerwater
Woking Surrey
GU21 5RW
P:0330 100 7750
F: 0330 100 7751
E:
W:
www.fernox.com
