Ideal Boilers Classic LXRS 245 P Installation And Servicing

Classic LXRS, RS - Propane Installation 9INSTALLATIONNote. The pumpmanufacturers minimumrequirements must becomplied with.All dimensions in mm (in.)Note. Gravity horizontal pipes should be ABOVE ceiling level and as SHORT aspossible. A MINIMUM inclination of 25 mm per 3 m run (1" per 10') is required to avoidair locks. If these conditions cannot be met, pumped primaries MUST be used.NB: Imperial dimensions are approximateThe above graph assumes 8 elbows in the gravity circuit. For each elbow in excess of8, (R) must be reduced by 300 mm (12 in.) or (H) increased by 100 mm (4 in.)6 OPEN VENT SYSTEM REQUIREMENTS - Fully pumpedThe system should be vented directly off the boiler flow pipe, as close tothe boiler as possible. The cold feed entry should be inverted and MUSTbe positioned between the pump and the vent, and not more than 150mm(6") away from the vent connection.There should be a minimum height - 450mm (18") of open vent above thecistern water level. If this is impossible refer below.The vertical distance between the highest point of the system and thefeed/expansion cistern water level MUST not 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 of providing an 11°C(20°F) temperature differential (e.g. Grundfos UPS 15/50 or equivalent).The vertical distance between the pump and feed/expansion cisternMUST comply with the pump manufacturer's minimum requirements toavoid cavitation. Should these conditions not apply, either lower the pumpposition or raise the cistern above the minimum requirement specified byCaradon Plumbing Ltd.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.SystemreturnConnectionsto boiler Inverted coldfeed entrySystemflow topump150 (6")Max15mmColdfeed450 (18")Mimimum450 (18")Mimimum22mmOpen ventFeed / expansioncisternWaterlevel(cold)INSTALLATION7 LOW HEAD INSTALLATIONSThe Classic range of boilers can be installed in lowhead situations by fitting a 'surge arrester' in theexpansion pipe, as shown.The following conditions MUST be observed:1. The surge arrester must be at least 42mm indiameter x 150mm long, thus ensuring a MINIMUMair gap and a MINIMUM depth of water below thestatic water level (cold) of 75mm.2. The static water level (cold) must be at least200mm above the top of the horizontal flow pipe,fitted as shown. The vent connection MUST NOT bemade immediately off the top of the boiler, asventing is made less efficient.3. The maximum practical length of 15mm cold feedpipe should be used in order to reduce the effectivevolume of system water expanding into the feed/expansion cistern to a minimum.Minimum RequirementsSurgearrester75 (3)Min.450(18)Min. 200(8)Min.Highestpoint offlow orreturn150(6)MaxMax. practicallengthTo pumpColdwaterlevelFeed / expansioncistern75 (3) Min.FlowReturn22 (3/4)Open vent8 REQUIREMENTS FOR CORRECT GRAVITY HOT WATER PERFORMANCE