Ideal Boilers i-mini 24 Installation And Servicing

Contents

11i-mini - Installation and Servicinggeneralgeneral1. The installation must comply with all relevant national and localregulations.2. The installation should be designed to work with flowtemperatures of up to 86 o C.3. All components of the system must be suitable for a workingpressure of 3 bar and temperature of 110 oC. Extra care shouldbe taken in making all connections so that the risk of leakageis minimised.The following components are incorporated within theappliance:a. Circulating pump.b. Safety valve, with a non-adjustable preset lift pressure of3 bar.c. Pressure gauge, covering a range of 0 to 4 bar.d. An 8-litre expansion vessel, with an initial charge pressureof 0.75 bar.4. ‘Make-up’ Water. Provision must be made for replacing waterloss from the system, either :a. From a manually filled ‘make-up’ vessel with a readilyvisible water level. The vessel should be mounted atleast 150mm above the highest point of the system andbe connected through a non-return valve to the system,fitted at least 150mm below the ‘make-up’ vessel on thereturn side of the radiators. orb. Where access to a ‘make-up’ vessel would be difficult, bypre-pressurisation of the system.The maximum cold water capacity of the system shouldnot exceed 143 litres, if not pressurized. However, ifthe system is to be pressurized, the efficiency of theexpansion vessel will be reduced and a larger vessel(or smaller system volume) may be necessary. If thecapacity of the vessel is not considered sufficient forthis, or for any other reason, an additional vessel MUSTbe installed on the return to the boiler.Guidance on vessel sizing is given in Frame 2.5. FillingThe system may be filled by the following method:Where the mains pressure is excessive a pressure reducingvalve must be used to facilitate filling.a. Thoroughly flush out the whole system with cold water.b. Fill and vent the system until the pressure gaugeregisters 1bar and examine for leaks.c. Check the operation of the safety valve by raising thewater pressure until the valve lifts. This should occurwithin 0.3bar of the preset lift pressure.d. Release water from the system until theminimum system design pressure is reached;1.0 bar if the system is to be pre-pressurised.Notesa. 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.b. Antifreeze fluid, corrosion and scale inhibitor fluids suitable foruse with boilers having aluminium heat exchangers may be usedin the central heating system.2 sysTEM REqUIREMENTs - Central heatingWater Flow Rate and pressure LossMax CH Output kW 24.2(Btu/h) (82,600)Water flow rate l/min 17.3(gal/min) (3.8)Temperature Differential o C 20( o F) (36)Head available for m.w.g. 3.4system (ft.w.g.) (11.1)safety valve setting bar 3.0Vessel charge pressure bar 0.5 to 0.75system pre-charge pressure bar None 1.0system volume Expansion vessel(litres) volume (litres)25 1.6 1.850 3.1 3.775 4.7 5.5100 6.3 7.4125 7.8 9.2150 9.4 11.0175 10.9 12.9190 11.9 14.0200 12.5 14.7250 15.6 18.4300 18.8 22.1For other system volumesmultiply by the factor across 0.063 0.074CH Return Hose unionsMainswater supplyTemporary hose(disconnect after filling)Additionalstop valveDouble check valveassembly(note direction of flow)