valutazioni - 4, GPA: 4
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) except for the following items . AIR-COOLED CONDENSER LOCATION The air-cooled condenser should not be located more than 60 feet above, or 15 feet below the base unit. Cneck the installation booklet with the condenser for installation details. In order to prevent condensed liquid refrigerant or oil from causing damage to the compressor, install a trap in the vertical discharge line near the compressor. The trap may be installed within or adjacent to the base unit chassis. The height of the trap (or loop) should be 6 inches for every 10 feet of vertical discharge line. If the height of the vertical discharge line is such as to make a single trap impractical, the loop can be replaced by a check valve or several traps. When installing refrigerant piping make certain it is well supported. Install piping with sufficient flexibility to make sure line vibrations are not transmitted to the building. The openings in the chassis normally used for the water-cooled condenser water piping may be used to bring the lines into the unit. Install the discharge line assembly, filter-drier and the moisture and liquid indicator in each circuit within the chassis of the base unit. Locate the filter-drier and the moisture and liquid indicator in the liquid line just before the liquid line enters the expansion valve. The moisture and liquid indicator goes between the filter-drier and the expansion valve. CRANKCASE HEATERS PRESSURE RELIEF PROTECTION One crankcase heater (230 volt, 1 phase, 60 cycle) will be factory installed on the outside of the bottom plate of each compressor. The crankcase heater elements replace the need for the liquid lines solenoid valves. Each crankcase heater has 36 inch leads for wiring in the field. Refrigerant pressure relief protection must be provided for each system at the time of installation of the unit. A suitable fusible union, a liquid line soft solder joint within the base unit, or a rupture disc (Chicago Code) may be used depending on local codes, etc. REFRIGERANT PIPING Install the hot gas and liquid line between the base unit and the external condenser for each system being careful to connect the correct components in each system. Fig. 1 through 4 shows the location of the connections at the base unit. Fig. 5 through 7 shows the schematic piping layout for the various units when connected with the 9AB Air-Cooled Condenser. Table 2 shows the connection sizes at the base unit and recommends line sizes for various refrigerant line lengths . Consult the Installation Instructions of the condenser used and Part 3 of the System Design Manual for piping details and line sizes when greater lengths are used. The 9AB6 receiver is provided with a 3/8" FPT fitting for the installation of a fusible union or rupture disc. The Cerro De Pasco Co. fusible union No. 5160-1 or No. 5250-1 (melting point 197 F or 203 F), Carrier Part No. EK41JN200 is suitable; check local codes. HEAD PRESSURE CONTROL A condensing pressure (head pressure) control accessory package is available for use with the 9AB condensers . Consult the 9AB Instruction Sheets for details. © Carrier Corporation 1960 Litho in U.S.A. 12-60 50K8-1415 50K INSTALLATION Carrier TABLE 1 Unit Circuit No Compressor Evaporator Coil Liquid Line Connection R-22 Pounds Model Location 50K8 (1 Circuit) 6D48 - - 10 50K12 Single Compressor (1 Circuit) 6D68 - - 10 50K16 Single Compressor (1 Circuit) 6D75 - - 15 50K16 No. 1 6D48 Left Side Right End 10 2 Compressor No. 2 6D48 Right Side Left End 10 * TABLE 2 Recommended Line Sizes Linear Feet Piping 20 40 60 Unit Discharge Line Connection Liquid Line Connection Liquid Line Hot Gas Liquid Line Hot Gas Liquid Line Hot Gas 50K8 7/8 1/2 1/2 7/8 1/2 7/8 1/2 7/8 50K12 Single Compressor 7/8 5/8 5/8 7/8 5/8 1-1/8 3/4 1-1/8 50K16 (Ea. Circuit) 2 Compressor 7/8 1/2 1/2 7/8 1/2 7/8 1/2 7/8 50K16 Single Compressor 1-1/8 5/8 5/8 1-1/8 3/4 1-1/8 3/4 1-3/8 REFRIGERANT CHARGE The unit will be shipped with a 2 lb. holding charge of Refrigerant 22. In the standard installation, Refrigerant 22 will be used. However, on special applications, Refrigerant 500 may be used. Consult your Application Engineering Data for information concerning the use of Refrigerant 500. When Refrigerant 500 is used, change the expansion valve to the one shown in Table 3. REFRIGERANT CHARGE QUANTITY During operation on Refrigerant 22 the base unit alone requires the number of pounds shown in Table 1. To this, add the needs for the refrigerant lines, condensers, and receivers (if used). Stamp the number of pounds used in the blank space provided on the nameplate. TABLE 3 - VALVES FOR R-500 SERVICE Unit Sporlan Valve 50K8 PDE6G 50K12 Single Compressor PDE9G 50K16 PDE13G Single Compressor 50K16 PDE6G 2 Compressor (2) required DUAL PRESSURESTATS Adjust the pressurestats according to pressure shown in Table 4. 2 (Carrier) INSTALLATION 50K TABLE 4 High Press. Switc...