Ideal Boilers Optia HE 9 Installation And Servicing Instructions

Optia HE - Installation & Servicing 11GENERALNon-returnvalveAutomaticair ventHose unionsAdditionalstop valveHose connectorHosepipe(disconnectafter filling)Double check valveassembly(note direction of flow)Temporary hose(disconnectafter filling)ecl60605 SEALED SYSTEM REQUIREMENTSNote.The method of filling, refilling, topping up or flushing sealedprimary hot water circuits from the mains via a temporary hoseconnection is only allowed if acceptable to the local waterauthority.1. Generala. The installation must comply with the requirements ofBS.6798 and BS.5449.b. The installation should be designed to work with flowtemperatures of up to 82 oC.c. All components of the system, including the heatexchanger of the indirect cylinder, must be suitable for aworking pressure of 3 bar (45 lb/in 2) and temperature of110 oC. Care should be taken in making all connectionsso that the risk of leakage is minimised.2. Safety ValveA spring loaded safety valve complying with the relevantrequirements of BS.6759 must be fitted in the flow pipe, asclose to the boiler as possible and with no intervening valveor restriction. The valve should have the following features:a. A non-adjustable pre-set lift pressure not exceeding 3bar (45 lb./in 2)b. A manual testing device.c. Provision for connection of a discharge pipe. The valveor discharge pipe should be positioned so that thedischarge of water or steam cannot create a hazard tothe occupants of the premises or cause damage toelectrical components and wiring.3. Pressure GaugeA pressure gauge covering at least the range 0-4 bar (0-60lb./in2 ) must be fitted to the system. The gauge should beeasily seen from the filling point and should preferably beconnected at the same point as the expansion vessel.4. Expansion Vessela. A diaphragm type expansion vessel must beconnected at a point close to the inlet side of the pump,the connecting pipe being not less than 15mm (1/2 "nominal) size and not incorporating valves of any sort.b. The vessel capacity must be adequate to accept theexpansion of the system water when heated to 110 oC(230 oF)c. The charge pressure must not be less than the staticwater head above the vessel The pressure attained inthe system when heated to 110oC (230 oF) should be atleast 0.35 bar (5lb/in 2) less than the lift pressure of thesafety valve.For guidance on vessel sizing refer to the table in Frame6. For further details refer to BS.5449. For IE refer to thecurrent edition of I.S. 813.5. CylinderThe cylinder must be either of the indirect coil type or adirect cylinder fitted with an immersion calorifier which issuitable for operating on a gauge pressure of 0.35 bar(5lb./in 2) in excess of the safety valve setting. Single feedindirect cylinders are not suitable for sealed systems.6. Make-up WaterProvision must be made for replacing water loss from thesystem, either:a. From a manually fitted make-up vessel with a readilyvisible water level. The vessel should be mounted atleast 150mm (6") above the highest point of thesystem and be connected through a non-return valve tothe system, fitted at least 300mm (12") below themake-up vessel on the return side of the domestic hotwater cylinder or radiators.b. Where access to a make-up vessel would be difficult bypre-pressurisation of the system. Refer to 'Filling.'