15
4000123923-2
General - All domestic hot water circuits, connections, fittings
must be in accordance with the relevant standards and water
supply regulations.
For GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulation Guide.
For IE: The current edition of I.S.813 "Domestic Gas Installations".
• Copper tubing or plastic Hep
2
0 may be used for the domestic
hot water system. Unnecessary pressure losses should be
avoided.
• Provision shall be made for a drain valve at the lowest points
of the system.
• The flow restrictor, supplied in the document envelope, must
be fitted as diagram 7.1, limiting the flow through the boiler to
a maximum of 12 litres/min for 30 ci and 14 litres/min for 35 ci.
• The boiler will operate with a minimum supply pressure of 0.5
bar, at a reduced flow rate.
Best operating performance will be obtained from a supply
pressure of 1 bar or greater.
4.1 Hard Water Areas
In areas where the water is 'hard', more than 200mg/litre, it is
recommended that a proprietary scale reducer is fitted in the
cold water supply to the boiler.
4 Domestic Hot Water System Design. 30ci Only
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