Figure 6: Main connections
Note: This is an indirect unit and shows the general position of components but these will change depending on the model.
5. Before installation
5.1 Installation regulations
WARNING
Installation of the appliance must be carried out by a qualified engineer in accordance with prevailing and national regulations as listed below.
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Building Regulations
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The Building Standards (Scotland)
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The Building Regulations (Northern Ireland)
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I.E.E Electrical Regs
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UK Water Regulations
page 10
5.2 Installation requirements
Water supply
In an unvented system the pressure and flowrate is directly related to the incoming water supply. For this reason it is recommended that the
maximum water demand is assessed and the water supply checked to ensure this demand can be satisfactorily met.
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The minimum supply requirements should be 0.15MPa (1.5 bar) pressure and 100 litres per minute flow rate.
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A 28mm cold water supply is recommended as a minimum. However, if a smaller supply exists, which provides sufficient flow, this may
be used (although more flow noise may be experienced).
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The higher the available pressure and flow rate the better the system performance.
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See table 2 for cylinder operating pressures. This is controlled by the cold water combination valve assembly.
Outlet/terminal fittings (taps, etc.)
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The cylinder can be used with most types of terminal fittings.
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Outlets situated higher than the cylinder will give outlet pressures lower than that at the heater, a 10m height difference will result in a 1
bar pressure reduction at the outlet.
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All fittings, pipework and connections must have a rated pressure of at least 8 bar at 80°C.
Limitations
The cylinder should not be used in association with any of the following:
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