MCDonald MULTIflow, Техническое руководство

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Issue 3 13/01/21
6
Water Treatment
In accordance with the Building Regulations L1A: New Dwellings / L1B: Existing
Dwellings , the requirements set out in the Domestic Building Services Compliance
Guide specify that “where the mains water hardness exceeds 200ppm provision should
be made to treat the feed water to water heaters and the hot water circuit of
combination boilers to reduce the rat
e of accumulation of lime scale”. In most instances
of this water condition, an inline Water Conditioner/Scale Inhibitor would be fitted to
the incoming mains.
The water quality shall be in accordance with European Council Directive 98/83/EC , or
revised version at the date of installation, and is not fed with water from a private
supply. Particular:
•
Chloride content: Max. 200 mg/l
•
Sulphate content: Max. 200 mg/l
•
Combination chloride/sulphate: Max. 300 mg/l (in total)
The MULTI flow is part of the primary system the Boiler models (where applicable) and
other parts of the primary circuit will require the application of a protective scale and
corrosion inhibitor such as Fernox to ensure adequate protection. This should avoid
having corrosive material in the primary system and remove any build-up of sludge
which can reduce the performance of the High Efficiency Heat Exchanger Coil.
The volumes and concentration of inhibitor required should be calculated in accordance
with the manufacturer’s instructions . Please ensure that the thermal store volume is
also included as well as the radiator and pipework volume.
While we strongly recommend it, inhibitor is optional where the units are utilised with
electricity only. However if there are doubts regarding the quality of water being used
to fill the MULTI
flow , an inhibitor should be added to the appliance when filling in line
with the manufacturer’s instructions for these products.
Please note that in all MULTI flow models, the primary water within the thermal store
water is used as primary storage and the domestic hot water is heated instantaneously
by means of the High Efficiency Heat Exchanger Coil. Therefore, treating the primary
water will not have an effect on the domestic hot water supply.