Document 0gRYEM4G3JkRaM36b3em0RYvV

Healing and Ventilating Units The Herman Nelson Corporation Moline, Illinois Manufacturers of the Her-Nel-Co System of Ventilation; the Herman Nelson Invisible Radiator; the Herman Nelson hiJet Heater; the Herman Nelson Univent System of Ventilation; Herman Nelson Wedge Core Radiator Sections The Her-Nel-Co System of Ventilation The Her-Nel-Co System of Venti lation reduces to practice the newer science of ventilation as applied to school class rooms and similar spaces. The es sential difference between the older and newer idea in ventilation is this: Under the older science a fixed amount of outdoor air was supplied at all times, whereas, with the Her-Nel-Co System of Ventilation out door air is admitted only when and as required to maintain proper temperatures. Her-Nel-Co Ventilator The system will not only provide a more positive ventilating result, but will effect large economies in fuel consumption, building construction and operating costs. The principal equipment used in the Her-Nel-Co System of Ventilation is the Her-Nel-Co Ventilator, illustrated. One or more of these machines, together with a sufficient amount of auxiliary direct radia tion is placed in each room to be heated and ventilated. No vent flues or exhaust air outlets are ordinarily employed. The Her-Nel-Co Ventilator is beauti fully finished in genuine Morocco enamel with bronzed fittings. It is arranged to be fastened against the wall with a gasket which prevents any air leakage around, the cabinet. The entire front is removable, giving free access to all parts. The cabinet contains. a radiator for heating the re-, circulated air (only), a fan and motor unit for forcing circulation, a filter.for removing dust and dirt, a steam jet humidifier and the dampers and mechanism which regu lates the admission and intermixture of in door and outdoor air. The radiator is the well known Herman Nelson 'Wedge Core Section, which has been used exclusively in Herman Nelson ventilating equipment since 1925. It is constructed entirely of aluminum, and is light, compact, sturdy and non-Ieakable. The front open view of the Her-Nel-Co Ventilator shows the position of the radiator, fan and motor unit, filter, damper control, etc. The Her-Nel-Co System may be manually or automatically controlled. In principle, the Her-Nel-Co System provides for the reheating and recirculat ing of indoor air after a delayed firing period, such as in the beginning of a school class day. After the recommended room temperature has been reached, over-heat ing is prevented by restricting the heat supply of the direct radiator. The next step in the cycle, is the com plete closing off of both the direct radiation and the radiator in the Her-Nel-Co Ventilator. There will naturally be a further rise in room temperature due to the heat given off by the occupants of the class room, to gether with the sun's rays, and this brings us into the next step of the cycle. All radiation is closed off and the indoor air is recirculated and intermixed with the right proportion of outdoor air in order to ^maintain a constant room temperature. The next step is the admission of out door air entirely, without recirculation, and with all radiation closed off. This system fulfills the requirements that science has prescribed viz., Air Motion; Humidity Regulation and Maintainance of a proper. Temperature. The fan motor unit is quiet, efficient, sturdy, powerful, sanitaryrsimple and reli able. It is located in the forward upper compartment of the Her-Nel-Co. Venti lator along with the filter, and draws air from either indoors or outdoors or both, 672 The Herman Nelson Corporation Heating and Ventilating Units according to the position of the dampers, and delivers it through the filter and dis charge nozzle into the room. It is portable and easily inspected, cleaned, oiled or taken out when the cabinet front is removed. The cone type fan is constructed entirely of aluminum. Her-Nd-Co Ventilator Front Open View The air filter is of a special horseshoe design, arranged to give extra large filtra tion area. No air can be delivered into the room without passing through the filter. Filter can be easily inspected or removed for cleaning when the front of the cabinet is removed. Filter is located on the dis charge side of the fan where it is not sub ject to low temperatures or weather effects and therefore the oil remains viscous and highly effective. At the same time, since it is not exposed to radiant heat effects, the oil is not evaporated and wasted. The dampers used in the Her-Nel-Co Ventilator are of the balanced type, care fully designed and mounted on weather*; proof bearings. A single blade damper, located near the bottom of the rear com partment of the Ventilator on the discharge side of the radiator, is used for controlling the admission of recirculated indoor air. The damper which controls the admission of outdoor air is of the multiblade louver type and is located directly in the outdoor inlet opening. These dampers are mechani cally interconnected so that the outdoor air supply is reduced as the indoor air sup ply is increased and vice versa. When required, a steam jet humidifier is furnished and located in the lower radia tor compartment and connected to the radiator in such a manner that it operates whenever the radiator operates, thereby providing humidity whenever the air is heated and expanded but not at other times. The Her-Nel-Co Ventilator is made in but one size designated as the 4500 series. It can be had in two models, however. The Model " J " is arranged to take out door air through an opening in the wall behind the machine and is the type gener ally preferred; When the intake opening is through an outer wall, as is usually the case, it should be protected with an air intake. The Model "K" is designed with the idea of taking outdoor air through the lower portion of a window opening and is pro vided with a long narrow intake located at the top of the cabinet and arranged to be built into the window construction. The intake sleeve is so constructed that it may be cut to fit on the job and a heavy wire screen in a steel frame is provided for use in the intake opening. The Her-Nel-Co Ventilator may be arranged for either hand or automatic tem perature control and is adaptable to either vapor, vacuum, gravity steam, or hot water systems. Filters and humidifiers are always recommended but may be omitted at the option of the purchaser. All motors are of the adjustable speed type to obtain varying air deliveries and may be furnished for all of the more usual current characteristics. As shown in the capacity table, both models are rated at three air deliveries and can be equipped with two different radia tors, giving two heating capacities for each air delivery. All air, deliveries are deter mined by the A.S.H.V.E. standard aner mometer method with th,e aneiriometer held 2 in. above the face of the grille. The air delivery in c.f.m. is determine, by multi plying this velocity-in;feet ppr minute by the gross area of the discharge grille in sq. ft. (1:58 sq. ft.).. .. All heating capacities aregiven in equiv alent sq. ft. of standard direct radiation (240 Btu) based on.218 F steam tempera ture and 70 F. room temperature.' For all practical purposes the heating capacity of the Her-Nel-Co Ventilator, when the motor is not running and the outdoor dampers are closed, is equal to about 20 sq. ft. of direct radiation. HER-NEL-CO VENTILATOR Capacity Table--Models "J" and "KM Serial No. 4514 4515 4524 4525 4534 4535 Cu. Ft. of Air per 700 700 800 m 900 900 Minute Heating Capacity Sq. Ft. 70 105 75 115 80 120 The Architects' and Engineers' catalog of any Herman Nelson product containing Complete-Engineering information will be gladly sent Architects and Engineers upon request. 673