Ideal Boilers Classic RS 300 Installation & Servicing Manual

Ideal Boilers Classic RS 300 Installation & Servicing Manual Manual pdf 10 page image

10Classic RS - Installation & ServicingINSTALLATIONNote.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 25mm per 3m run (1" per 10') is required toavoid air 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 excessof 8, (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 to the boileras possible. The cold feed entry should be inverted and MUST be positionedbetween the pump and the vent, and not more than 150mm (6") away from thevent connection.There should be a minimum height - 450mm (18") - of open vent above the cisternwater 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 (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 verticaldistance between the pump and feed/expansion cistern MUST comply with thepump manufacturer's minimum requirements to avoid cavitation. Should theseconditions not apply, either lower the pump position or raise the cistern above theminimum requirement specified by Caradon Ideal Limited.Note.A cold water feed must be available back to the boiler when all automaticvalves are in the closed position (refer to BS. 6798) and, when close coupled, thefeed must not be in a vertical leg.SystemreturnConnectionsto boiler Inverted coldfeed entrySystemflow topump150 (6")Max15mmColdfeed450 (18")Mimimum450 (18")Mimimum22mmOpen ventFeed / expansioncisternWaterlevel(cold)Minimum RequirementsSurgearrester75 (3)Min.450(18)Min. 200(8)Min.Highestpoint offlow orreturn150(6)MaxMax. practicallengthTo pumpColdwaterlevelFeed / expansioncistern75 (3) Min.FlowReturn22 (3/4)Open vent7 LOW HEAD INSTALLATIONSThe Classic range of boilers can be installed in low headsituations by fitting a 'surge arrester' in the expansion pipe,as shown.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 immediatelyoff the 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 cisternto a minimum.8 REQUIREMENTS FOR CORRECT GRAVITY HOT WATER PERFORMANCEINSTALLATION