Ideal Boilers HE24 Installation And Servicing Instructions

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Ideal Boilers HE24 Installation And Servicing Instructions Manual pdf 11 page image

11isar + programmer - Installation and ServicingGENERAL4 SYSTEM REQUIREMENTS - CH (continued) and Hot Wateran additional vessel MUST be installed on the returnto the boiler.Guidance on vessel sizing is given in Frame 3.5. Filling. The system may be filled by the following method:a. Through a temporary hose connection from a 'draw-off'tap, supplied from a service pipe under mains pressure.Where the mains pressure is excessive a pressurereducing valve must be used to facilitate filling.When installing the filling device it must be connected asshown below, to fully comply with the water regulations.This may involve the fitting of an additional WRASapproved isolator valve to the mains supply.i. Thoroughly flush out the whole system withcold water.ii. Fill and vent the system until the pressuregauge registers 1.5 bar and examine for leaks.iii. Check the operation of the safety valve byraising the water pressure until the valve lifts.This should occur within 0.3 bar of the preset liftpressure.iv. Release water from the system until theminimum system design pressure is reached;1.0 bar if the system is to be pre-pressurised.Water Flow Rate and Pressure LossMax CH Output kW 23.4(Btu/h) (80 000)Water flow rate l/sec 0.37(gal/min) 4.8Temperature Differential o C 15( oF) (27)Head available for m.w.g. 2.3system pump. (ft.w.g.) 7.5DOMESTIC HOT WATER1. The domestic hot water service must be in accordancewith BS 5546 and BS 6700.2. Refer to Table 1 for minimum and maximum workingpressures.3. The boilers are suitable for connection to most types ofwashing machine and dishwasher appliances.4. When connecting to suitable showers, ensure that:a. The cold inlet to the boiler is fitted with an approvedanti-vacuum or syphon non-return valve.b. Hot and cold water supplies to the shower are of equalpressure.CH ReturnEcl 6053Hose unionsMainswater supplyTemporary hose(disconnect after filling)Additionalstop valveDouble check valveassembly(note direction of flow)The boiler does not normally need a bypass but at least someradiators on the heating circuit, of load of at least 10% of theminimum boiler output, must be provided with twin lockshieldvalves so that this minimum heating load is always available.See note regarding thermostatic radiator valves on page 10.Note. Systems incorporating zone valves which couldcompletely cut off the flow through the system must alsoinclude a bypass.BALANCING1. Set the programmer to ON.Close the manual or thermostatic valves on all radiators,leaving the twin lockshield valves (on the radiators referredto above) in the OPEN position.5 SYSTEM BALANCINGTurn up the room thermostat and adjust these lockshieldvalves to give boiler flow and return temperatures notmore than 20 o C apart.These valves should now be left as set.2. Open all manual or thermostatic radiator valves andadjust the lockshield valves on the remaining radiators,to give around 15 o C temperature drop at each radiator.3. Adjust the room thermostat and programmer toNORMAL settings.5. Hard Water AreasWhere the water hardness exceeds 200mg/litre, it isrecommended that a proprietary scale reducing device isfitted into the boiler cold supply within the requirements ofthe local water company.IMPORTANTProvision MUST be made to accommodate the expansion ofDHW contained within the appliance, if a non-return valve isfitted to the DHW inlet.