Ideal Boilers Classic FF 230 Installation And Servicing Manual

Also see for Classic Combi FF 280: Installation and servicing User guide

Ideal Boilers Classic FF 230 Installation And Servicing Manual Manual pdf 9 page image

Classic LXFF, FF - Installation 9GENERALMinimum RequirementsNote. The pump manufacturers minimumrequirements must be complied withSystemreturnConnectionsto boiler Inverted coldfeed entrySystemflow topump150 (6")Max15mmColdfeed450 (18")Mimimum450 (18")Mimimum22mmOpen ventFeed / expansioncisternWaterlevel(cold)Surgearrester75 (3)Min.450(18)Min. 200(8)Min.Highestpoint offlow orreturn150(6)MaxMax. practicallengthTo pumpColdwaterlevelFeed / expansioncistern75 (3) Min.FlowReturn22 (3/4)Open ventAll dimensions in mm (in.). N.B. Imperial dimensions are approximate4 LOW HEAD INSTALLATIONSThe system should be vented directly off the boiler flowpipe, as close to the boiler as possible. The cold feed entryshould be inverted and MUST be positioned between thepump and the vent, and not more than 150mm (6") awayfrom the vent connection.There should be a minimum height - 450mm (18") - of openvent above cistern water level. If this is impossible referbelow.The vertical distance between the highest point of thesystem and the feed/expansion cistern water level MUSTnot be less than 450mm (18").The pump MUST be fitted on the flow side of the boiler.A suitable pump is a domestic circulator capable ofproviding an 11°C (20°F) temperature differential (e.g.Grunfos UPS 15/50 or equivalent). The vertical distancebetween the pump and feed/expansion cistern MUSTcomply with the pump manufacturers minimumrequirements to avoid cavitation. Should these conditionsnot apply, either lower the pump position or raise thecistern above the minimum requirement specified byCaradon Plumbing Limited.Note. A cold water feed must be available back to theboiler, when all automatic valves are in the closed position(refer to BS. 6798) and when close coupled the feed mustnot be in a vertical leg.The Classic range of boilers can beinstalled in low head situations by fitting a'surge arrester' in the expansion pipe asshown.The following conditions MUST beobserved:1. The surge arrester must be at least42mm in diameter x 150mm long,thus ensuring a MINIMUM air gap anda MINIMUM depth of water below thestatic water level (cold) of 75mm.2. The static water level (cold) must beat least 200mm above the top of thehorizontal flow pipe, fitted as shown.The vent connection MUST NOT bemade immediately off the top of theboiler, as venting is made lessefficient.3. The maximum practical length of15mm cold feed pipe should be usedin order to reduce the effectivevolume of system water expandinginto the feed/expansion cistern to aminimum.3 OPEN VENT SYSTEM REQUIREMENTS - FULLY PUMPED.