Ideal Boilers Optia HE 9 Installation And Servicing Instructions

10 Optia HE - Installation & ServicingGENERALMinimum RequirementsNote. The pump manufacturers minimumrequirements must be complied with.SystemreturnConnectionsto boiler Inverted coldfeed entrySystemflow topump150 (6")Max15mmColdfeed450 (173 /4 ")Mimimum450 (17 3 /4 ")Mimimum22mmOpen ventFeed / expansioncisternWaterlevel(cold)cla7840Surgearrester75 (3)Min.450(173 /4")Min. 200(8)Min.Highestpoint offlow orreturn150(6)MaxMax. practicallengthTo pumpColdwaterlevelFeed / expansioncistern75 (3) Min.FlowReturn22 (3/4)Open ventcla7839All dimensions in mm (in.). N.B. Imperial dimensions are approximate4 LOW HEAD INSTALLATIONSThe system should be vented directly off the boiler flow pipe, as close to theboiler as possible. The cold feed entry should be inverted and MUST bepositioned between the pump and the vent, and not more than 150mm (6")away from the vent connection.There should be a minimum height - 450mm (17 3/ 4") - of open vent abovecistern water level. If this is impossible refer below.The vertical distance between the highest point of the system and the feed/expansion cistern water level MUST not be less than 450mm (173/ 4").The pump MUST be fitted on the flow side of the boiler.A suitable pump is a domestic circulator capable of providing an 11 oC (20 oF)temperature differential (e.g. Grundfos UPS 15/50 or equivalent). The verticaldistance between the pump and feed/expansion cistern MUST comply withthe pump manufacturers minimum requirements to avoid cavitation. Shouldthese conditions not apply, either lower the pump position or raise the cisternabove the minimum requirement specified by Wolseley UK.Note. A cold water feed must be available back to the boiler, when allautomatic valves are in the closed position (refer to BS. 6798) and whenclose coupled the feed must not be in a vertical leg.The Optia HE range of boilers can be installed in low headsituations by fitting a 'surge arrester' in the expansion pipe asshown.The following conditions MUST be observed:1. The surge arrester must be at least 42mm in diameter x150mm long, thus ensuring a MINIMUM air gap and aMINIMUM depth of water below the static water level (cold)of 75mm.2. The static water level (cold) must be at least 200mmabove the top of the horizontal flow pipe, fitted as shown.The vent connection MUST NOT be made immediately offthe top of the boiler, as venting is made less efficient.3. The maximum practical length of 15mm cold feed pipeshould be used in order to reduce the effective volume ofsystem water expanding into the feed/expansion cistern toa minimum.3 OPEN VENT SYSTEM REQUIREMENTS - FULLY PUMPEDWhen thermostatic radiator valves are used, the space heatingtemperature control over a living / dining area or hallway havinga heating requirement of at least 10% of the boiler heat outputshould be achieved using a room thermostat, whilst otherrooms are individually controlled by thermostatic radiator valves.However, if the system employs thermostatic radiator valves onall radiators, or two port valves without end switches, then abypass circuit must be fitted with an automatic bypass valve toensure a flow of water should all valves be in the closedposition.ELECTRICAL SUPPLYWARNING. The appliance MUST be efficiently earthed.Wiring external to the appliance MUST be in accordance with thecurrent I.E.E. (BS.7671) Wiring Regulations and any localregulations which apply. For Ireland reference should be madeto the current ETCI rules for electrical installations.The point of connection to the mains should be readily accessibleand adjacent to the boiler, except that for bathroom installations;the point of connection to the mains MUST be situated outside ofthe bathroom.Note.Where a room sealed appliance is installed in a room containinga bath or shower then the appliance and any electrical switch orappliance control utilising mains electricity should be so situatedthat it cannot be touched by a person using the bath or shower.See Frame 41 for details.CONDENSATE DRAIN Refer to Frames 38, 39 and 40A condensate drain siphon is provided on the boiler. This drainmust be connected to a drainage point on site. All pipework andfittings in the condensate drainage system MUST be made ofplastic- no other materials may be used.IMPORTANT.Any external runs must be insulated.The drain outlet on the boiler is standard 21.5mm (3/4") overflowpipe.