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Thermal cut-out wiring for indirectly heated systems
2.10NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Where the system is indirectly heated the non self-resetting thermal cut-out should be wired to a motorised valve or some other device which is – (a) approved by a member of EOTA; or (b) approved by a
unvented-hot-waterindirect-heatingthermal-safetyPressure control devices
2.11NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should have the following devices to control the pressure within the system – (a) a pressure reducing valve complying with BS EN 1567; and (b) an expansion valve c
unvented-hot-waterpressure-controlCheck valve and expansion vessel
2.12NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should also have – (a) a check valve complying with BS EN 13959 to prevent the expansion of water to the cold supply; and (b) an expansion vessel complying with BS
unvented-hot-waterbackflow-preventionexpansionTundish installation and discharge requirements
2.13NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Each temperature relief valve and expansion valve should discharge through a metal pipe either individually, or via a manifold, to a tundish incorporating an air break. Where the discharge is individu
unvented-hot-watersafety-dischargescalding-riskaccessibility