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3.4.1 Hydraulic resistance
3.4.2 Water treatment
The product incorporates a stainless steel heat exchanger.
Particularly where a new boiler is to be fitted to an existing system, it is good practice that the
system is thoroughly cleansed. This cleansing should take place prior to the fitting of the new
boiler and be in accordance with BS 7593.
In accordance with BS 7593 : 1992 a corrosion inhibitor such as Sentinel X100 should be used.
It is very important that the correct concentration of any additive is maintained at the level
recommended by the manufacturer. In hard water areas lime scale treatment may be necessary.
Artificially softened water not be be used.
3.5 Gas supply
a) Consult the gas supplier before attempting to install the appliance
b) The gas installation must be in accordance with the current issue of BS 6891
c) A minimum of 22mm diameter pipework is required to within 1 metre of the product and a
pressure drop of no more than 1 millibar is permissible
c) Before any gas work commences, the gas pipework shall be tested for soundness.
Navien stirling engine m-CHP installation manual
Diagram 3.3 Pressure Loss
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