Ideal Boilers BOXER C 24 Installation And Servicing Manual

Also see for BOXER C 24: Installation and servicing guide

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Ideal Boilers BOXER C 24 Installation And Servicing Manual Manual pdf 9 page image

9BOXER combination boiler - Installation and ServicingGENERAL4 SYSTEM REQUIREMENTS - CH (continued) and HOT WATERGeneral1. The installation must comply with all relevant national andlocal regulations.2. The installation should be designed to work with flowtemperatures of up to 82 oC.3. All components of the system must be suitable for a workingpressure of 3 bar and temperature of 110 oC. Extra careshould be taken in making all connections so that the risk ofleakage is 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. A 5-litre expansion vessel for BOXER C 24 and a 8-litreexpansion vessel for BOXER C 28, with an initial chargepressure of 1 bar.4. 'Make-up' Water. Provision must be made for replacingwater loss from the system, either :a. From a manually filled 'make-up' vessel with a readilyvisible water level. The vessel should be mounted atleast 150 mm above the highest point of the system andbe connected through a non-return valve to the system,fitted at least 150 mm 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 systemshould not exceed 67 litres for BOXER C 24 and 108litres for BOXER C 28, if not pressurized. However,with the system 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 vesselMUST be installed on the return to the boiler.Guidance on vessel sizing is given in frame 3.5. Filling. The system may be filled as follows:Through a temporary hose connection from a 'draw-off'tap, supplied from a service pipe under mainspressure. Where the mains pressure is excessive, apressure reducing valve must be used to facilitatefilling.i. Thoroughly flush out the whole system withcold water.ii. Fill and vent the system until the pressure gaugeregisters 1.5 bar, and examine for leaks.iii. Check the operation of the safety valve by raising thewater pressure until the valve lifts.This should occur within 0.3 bar of the preset liftpressure.iv. Release water from the system until the minimumsystem design pressure is reached;1.0 bar if the system is to be pre-pressurised.When installing the filling connection provided with theboiler, an additional WRAS approved value MUST befitted to the mains water supply, up stream of thedouble check valve to fully comply with the waterregulationsWater Flow Rate and Pressure LossBOXER C 24 C 28Max CH Output kW 24.3 28.0(Btu/h) (82,900) (95,500)Water flow rate l/sec 0.38 0.44(gal/min) 4.9 5.7Temperature Differential oC 15 15(oF) (27) (27)Head available for m w.g. 2.3 2.3system pump. (ft w.g.) 7.5 7.5DOMESTIC HOT WATERDomestic Hot Water Requirements1. 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.5. Hard Water AreasWhere the water hardness exceeds 200 mg/litre, it isrecommended that a proprietary scale reducing deviceis fitted into the boiler cold supply within therequirements of the 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.&+5HWXUQ+RVHXQLRQV0DLQVZDWHUVXSSO\6WRSYDOYH7HPSRUDU\KRVH'RXEOHFKHFNYDOYHDVVHPEO\$GGLWLRQDOLVRODWLRQYDOYH