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'1 f-'" ~."\ (.J ;) , be so designed and counterbalanced as to drop to full open posi tio. upon the failure or breakage of connecting linkage. The uptake or outlet damper must have an indicator or pointer visible to the opera- ~or to show the position of the damper in relation to open and closed position. Remote indicators are permitted where necessar.y. 6-238 When uptake damper is set in a fixed position such as will be used with "on" and "off" control or the modulating type that operates only the air louyres on the lmrner, a draft regulator must be used: This regulator shall be of the type that will reverse and open to the boiler room in the event of down or 'lack drafts. Where control that operat6ls the damper is used, or induced or forced draft faa or both is used, it shall be optional as to the use of a draft regulator. Draft hood or diverter is not permissible. 6-239 All gas burner installations in steam boilers with an input exceeding 2,500 ft. of gas per hour shall be equipped with indicating gauges for furnace, windbox and uptake draft to shwo combustion conditions and 'i{ith flue gas analysis equipment of port~ble or fexed type. On installations exceeding 20,000 ft! gas input per hour, equipment shall be installed for continuous indication or recording of carbon dioxide, oxygen or air flow-steam flow. 6-240 All piping Gonnections for gas burners under this sedtion of the code , shall be properly sized for the design maxtmum load with a total pressure drop permissible under the particular conditions of the application. 6-241 On all installations with an input capacity in excess of 1,000,000 BTU per hour, the eontractor shall submit to the Heating Inspector with his request for a permit a detail drawing made by the burner manufacturer showing methof of installing burner, recommended furnace construction including floor insulation, control assembly along with piping details, pipe sizes, valve Sizes, type and make of control of of tie uptake damper operating type. If this is to be furnished by someone other than the burner manufacturer, he must show this as it will be applied to his burner. This drawing must be one that is made up for the speci- fic job and connot be what is known as a typical installation or a marked up drawing of some similar installation with changes to suit the job in question. This drawing must have a drawing number as rill as a title listing the name of the job to which it applies. It is desirable that this drawing may be made by the home office of the burner manufacturer but, in lieu of this, drawing maY' be made by the local representative in which case it must be certifiea by an officer of the manufacturer that it is approved by them. 6-242 At completion of installation the installer shall adjust all equipment and controls and, in the presence of :the inspector, demonstrate the proper functioning of all equipment and controls throughout the normal range of .operation from minimwn to maximum input. A combustion analysis shall be made to demonstrate proper combustion results throughout the operating range. Burners shall be able to demonstrate main burner flame retention without pilot stabilization but pilot shall be used in all cases. -52-