Document arN4R5Mq52yaymGzVxXXo6LY

American Society of Heating and Ventilating Engineers Guide, 1937 m parts. The vertical unit shown in Fig. 15 consists of a fan section, housing one or more fans, mounted on a coil section in which are located a heating coil and a cooling coil, which may be built for either direct expansion refrigerant, chilled water, or brine. These two sections are supported on a third or drip-pan section. The distributing duct system is attached to the fan outlets and returned fresh air connections are made to the drip, pan. A filter box is illustrated attached to the drip-pan section. By eliminating the vertical type drip-pan and substituting a horizontal drip, pan, this unit is converted into a horizontal suspended type conditioning unit for connection to duct work, both with and without filters, as shown in Fig. 17. A spray type conditioning unit is illustrated in Fig. 16. This spray type unit, which is similar to the arrangement given in Fig. 15, provides OUCT CONNECTIONS,^^ i | OtsS&RCE m HEATING ELEMENT IB- __Unit Heaters, Ventilators, Air Conditioning, Cooling Units Chapter Fig. 17 Horizontal Remote Type All-Year-Round Conditioning Unit adaptation of mechanical warm air systems to conditioning, which are covered in Chapter 24. However, the following illustrations will cover details not included in that Chapter. In Fig. 18 is shown a conditioning unit which may be operated in conjunction with a hot water or steam boiler. Heat generated in the boiler is supplied to an exchanger which raises the air temperature as it is circulated through the unit. The connection of a cooling coil to a OOLING ELEMENT UCTION ,1 j Fig. 15. Vertical Remote Type All Year-Round Conditioning Unit Fig. 16. Spray Type Air Conditioning Unit for the complete washing of the air and the cooling coil. For winter operation the spray provides means for humidification. The units may also be obtained with by-pass dampers as shown in Fig. 16, to provide control of cooling in summer and humidification in winter. The spray type unit without the cooling coil may be used for humidification and heat control. This type of air conditioning unit is used in industrial process air conditioning as well as for comfort air conditioning. Residential Central System Units The previous figures have largely confined themselves to the illustration of all-year-round or summer conditioning units for office or commercial application. The smaller units have, of course, been applicable to residences. There remains a field of air conditioning units primarily adaptable to residence work. They are in general the outgrowth of 266 267