Harry Taylor HT2000 Installation & Servicing Manual
Also see for HT2000: ManualManualInstallation & servicing manualManualInstallation, service and user manual
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Contents
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122.5 Air distribution systemAll materials used within the construction ofthe delivery and return air ducts must notrepresent a fire hazard and should be madefrom thermally inert materials. The selectionof materials must take account of theenvironment into which the heater and its airdelivery system is expected to work, it mustalso take account of the stresses andloadings placed upon it during its normalworking life Where interjoist spaces areused to route ducting these must be linedwith fire resistant insulation material.In installations where forced recirculation isa feature, a full and unobstructed return airpath to the heater(s) must be provided, withreturn air grilles connected by ductingdirectly to the return air inlet on the heater.The limit for recirculation should not begreater than 85% recirculated air to 15%fresh air.Where the heater is installed within aenclosure or plant room the return air anddischarge air arrangement must be suchthat the air circulation fan does not interferewith the operation of the flue. The return airintake and warm air outlet should thereforebe fully ducted to and from the heater,respectively, within the compartment orplant room.If the inlet air is ducted to the outside, thenthe lowest edge of the inlet air duct must beat least 500 mm above the outside floor orground level, it must also be fitted with anaccess point (s) to allow for cleaning andservicing to occur. The openings in thestructure of the plant room, through whichthe ductwork passes must be of fireresistant material and constructed to preventthe likelihood of any fire from spreading.In ducted applications the ductwork must bedesigned so as to give a static pressurewithin the limits stated in section 8 of thismanual. It should be noted that if the staticpressure is too high, nuisance shut-downwill occur when the heater goes out on theoverheat limit thermostat, if the staticpressure is too low, then damage can becaused to the fan motor.Warm air outlets on ducted applicationsmust be such that they cannot be closed orbecome blocked, which again would lead toan increase in static pressure and nuisanceshutdown.The outlets must not be sited so that warmair can be discharged onto combustiblematerials, if necessary, guard rails shouldbe used to ensure that effected areas arekept clear. Return air intakes must not belocated so that potentially harmful orhazardous contaminated air can be drawninto the system.2.6 Flue system.It is essential that the products ofcombustion are flued to the outside of thebuilding. Each heater must have its ownseparate flue, with a flue diameter of notless than is detailed in section 8 within thismanual.The minimum vertical length of flue must notbe less than 3m. The flue should risevertically, and the number of bends shouldbe kept to a minimum.Flue pipe should be supported at intervalsnot exceeding 1.8mtrsFlue pipes below a height of 2 m shouldbe guarded against the possibility ofbeing accidentally touched when hot bypersonnelIt is strongly advised that BS 5854; 1980,and BS 5440; parts 1 and 2, are used asconsultative documents when consideringflue requirements.Care should be taken to ensure that the flueterminal is not situated in a high pressurearea, the proximity of buildings and otherobstacles which will influence this must betaken into account, preferably at the designstage. See figures 2-12.Provision must be made for thedisconnection of the flue for inspection andservice requirements, and it is stronglyadvised that where bends are fitted |
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