Ideal Boilers Classic FF 340 LF Installation And Servicing Manual

Also see for Classic FF 340 LF: User guide

Classic FF 340 - 360 LF - Installation & Servicing 9GENERALNote.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 water authority.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 heat exchangerof the indirect cylinder, must be suitable for a workingpressure of 3 bar (45 lb/in 2 ) and temperature of 110 o C.Care should be taken in making all connections so thatthe 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 preset lift pressure not exceeding 3 bar(45 lb./in 2)b. A manual testing device.c. Provision for connection of a discharge pipe.The valve ordischarge pipe should be positioned so that the dischargeof water or steam cannot create a hazard to the occupantsof the premises or cause damage to electrical componentsand wiring.3. Pressure GaugeA pressure gauge covering at least the range 0-4 bar(0-60lb./in 2) must be fitted to the system. The gauge shouldbe easily 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 be connectedat a point close to the inlet side of the pump, the connectingpipe being not less than 15mm (1/2 " nominal) size andnot incorporating valves of any sort.b. The vessel capacity must be adequate to accept theexpansion of the system water when heated to 110 o C(230 o F)c. The charge pressure must not be less than the staticwater head above the vessel The pressure attained in thesystem when heated to 110 oC (230 oF) should be at least0.35 bar (5lb/in 2) less than the lift pressure of the safetyvalve.For guidance on vessel sizing refer to Table 6, Frame 6. Forfurther details refer to BS.5449. For IE refer to the currentedition of I.S. 813.5. CylinderThe cylinder must be either of the indirect coil type or a directcylinder fitted with an immersion calorifier which is suitablefor operating on a gauge pressure of 0.35 bar (5lb./in2) inexcess of the safety valve setting.Single feed indirectcylinders 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 readily visiblewater level. The vessel should be mounted at least 150mm(6") above the highest point of the system and be connectedthrough a non-return valve to the system, fitted at least300mm (12") below the make-up vessel on the returnside of the domestic hot water cylinder or radiators.b. Where access to a make-up vessel would be difficult bypre-pressurisation of the system. Refer to 'Filling.'Non-returnvalveAutomaticair ventHose unionsAdditionalstop valveHose connectorHosepipe(disconnectafter filling)Double check valveassembly(note direction of flow)Temporary hose(disconnectafter filling)ecl60605 SEALED SYSTEM REQUIREMENTS