Nortek NRV24M Installation And Operating Manual

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Nortek NRV24M Installation And Operating Manual Manual pdf 5 page image

Doc No. 700070 Page 5 of 56The Nor-Ray-Vac ‘M’ series conforms to the followingharmonised standards:BS EN 292 -1Safety of Machinery - Basic Concepts, General Principles forDesign Basic terminology, methodology BS EN 292-2.Safety of Machinery - Basic Concepts, General Principles forDesign Technical Principles and Specifications.BS EN 60204-1Safety of Machinery - Electrical Equipment for MachinesSpecification for General Requirements.BS EN 60335-1Safety of Household and Similar Electrical AppliancesGeneral RequirementsBS EN 55014Limits and methods of measurement of radio disturbancecharacteristics of electrical motor-operated and thermalappliances for household and similar purposes, electricaltools and similar electric apparatus.BS EN 50165Electrical Equipment of non-electric heating appliances forhousehold and similar purposes, safety requirements.1.2 Certificates of conformityCertificates are available from the manufacturer, addressdetails are shown on the back page.Notified body Pin reference is : 86CP521.3 General product informationThe Nor-Ray-Vac ‘M’ series radiant heating systemcomprises of a modulating continuous system with anumber of burners located in series in a radiant branch, anda number of radiant branches manifolded together, linkedby a tail pipe to a vacuum fan discharging the spentproducts of combustion to atmosphere. A system maycomprise of just one burner and one vacuum fan, tomultiple burners in multiple radiant branches with one ormore vacuum fans.To enable exact matching of operational needs within anarea, distances between burners and ratings of the burnerscan vary. The unique feature of Nor-Ray-Vac ‘M’ series is amodulating radiant system which provides uniform heatcoverage of the floor area, eliminating hot/cold spots.The tube into which the burners are mounted and overwhich the reflectors are fitted and emits the maximum heatis called the radiant tube. The radiant heat emitted from thehot tube is directed downwards by reflectors. Theremaining interconnecting tube is called the tail pipe andradiates with less intensity.The operating temperatures of the tubes generally rangefrom 200°C – 480°C max.The action of the vacuum fan is three fold; to create a highnegative pressure within the radiant tube and tail pipe soas to discharge the spent products of combustion from thesystem to a point outside the building being heated; tocontrol the flow of gas and air through each burner instoichiometric proportions; to draw carrier air into thetube system at the start of each radiant branch, in order todistribute the heat from the flame along the tube.Ducted air inlet kits are also available for contaminated ordusty environments.Each heater is fitted with a burner which has been test firedand pre-set prior to despatch. The safety functions of theburner are by way of a fully sequential control box fitted tothe burner.NoteNeither asbestos nor soft soldered joints are used in theconstruction or manufacture of the Nor-Ray-Vac ‘M’ series.The materials selected for use can withstand themechanical, chemical, and thermal stresses which they willbe subject to during foreseen normal use when installed inaccordance with the manufacturers recommendations.1.4 Model DefinitionsNRVxxM-EV = Nor-Ray-Vac modulating continuous radianttube heater only for use with branch endconfigurations.NRVxxM-IL = Nor-Ray-Vac modulating continuous radianttube heater only for use with in-line configurations.xx denotes kW rating. Models available; 24, 32, 38 and 461.5 General requirementsCautionBefore installation, check that the local distributionconditions, nature of gas and pressure, and adjustment ofthe appliance are compatible.