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Hersteller: Liebert Dateigröße: 2.77 mb Dateiname: Unterrichtssprache:

Factory-wired to 24V control circuit. Control interlock (70, 71) Field-supplied Class 1 wiring to interlock condenser 24V controls to Liebert room unit; 7/8 in. (22.2mm) diameter hole provided in bottom of electric box. Factory-wired to components on electric panel. Earth ground connection (60Hz). Connection terminal for field-supplied earth grounding wire when factory disconnect is supplied. Earth ground bar (optional on 50Hz only). Connection terminals with factory ground from each high voltage component for field-supplied earth grounding wire. Factory-installed fuse block on 60Hz units. Circuit breaker supplied in lieu of fuse block on 50Hz units. Electric service connection terminals with factory- supplied disconnect. Electric service entrance. A 7/8" (22.2mm) diameter hole in a 1-1/8 in (28.6mm) knockout provided in bottom of electric box. Electric service, not by Liebert Factory-installed disconnect switch. DPN001051 Rev. 0 NOTE: Refer to specification sheet for full load amp. and wire size amp. ratings. 24 Inspection and Installation Figure 21 Electrical field connections for Liebert Lee-Temp control condensers 7071Earth ground connection (60Hz). Connection terminal for field-supplied Earth ground bar (optional on 50Hz only). Connection terminals with factory ground from each high-voltage component for field-supplied earth grounding wire. Factory-wired to components on electric panel. Electric service connection and fuse block. Factory wired to 24V Class 2 control circuit. Control interlock (70, 71) Field-supplied Class 2 wiring to interlock condenser 24V controls to Liebert room unit; 7/8 in. (22.2mm) diameter hole provided in bottom Lee-Temp receiver tank (1 per circuit). NOTE: Standard heater pads are 150 watts each. (Optional 300 watt heater pads are available.) Standard heater pad voltage is 230V. (120V heater pad voltage is optional.) Electrical connection box with cover. Electrical service connection. Pigtails in electric handy box are factory wired to Lee- Temp heater pads for field connection of separate continuous electric source, wiring not by Liebert. Electric service connection terminals when factory disconnect is NOT supplied. Electric service connection terminals when factory disconnect is supplied. of electric box. Factory-installed disconnect switch (optional). Electric service entrance. A 7/8 in (22.2mm) diameter hole in a 1 1/8 in (28.6mm) knockout provided in bottom of electric box. Electric service. Three-phase for earth grounding wire when factory disconnect is NOT supplied. Earth ground connection (60Hz). Connection terminal for field-supplied all models. Wiring not by Liebert. DPN000683 earth grounding wire when factory disconnect Rev. 0 is supplied. NOTE: Refer to specification sheet for full load amp. and wire size amp. ratings. 25 Inspection and Installation 3.9 Refrigeration Piping Connections ! ! WARNING Risk of explosive discharge from high-pressure refrigerant. Can cause equipment damage, injury or death. Relieve pressure before working with piping. WARNING Risk of refrigerant system rupture or explosion from overpressurization. Can cause equipment damage, injury or death. If a pressure relief device is not provided with the condenser unit, the system installer must provide and install a discharge pressure relief valve rated for a maximum of 500 psig (34bar) in the high side refrigerant circuit. Do not install a shutoff valve between the compressor and the field installed relief valve. One or more additional pressure relief valves are required downstream of any and all field installed isolation valves as shown in Figures 2 and 24. Do not isolate any refrigerant circuits from overpressurization protection. NOTE POE (polyol ester) oil, required with R407C and used with some R22 systems, is much more hygroscopic than mineral oils. This means that POE oil absorbs water at a much faster rate when exposed to air than previously used mineral oils. Because water is the enemy of a reliable refrigeration system, extreme care must be used when opening systems during installation or service. If water is absorbed into the POE oil, it will not be easily removed and will not be removed through the normal evacuation process. If the oil is too wet, it may require an oil change. POE oils also have a property that makes them act as a solvent in a refrigeration system. Maintaining system cleanliness is extremely important because the oil will tend to bring any foreign matter back to the compressor. 3.9.1 Piping Guidelines Indoor units and condensers both ship with nitrogen holding charges. Do not vent the condenser until all refrigerant piping is in place, ready for connection to indoor unit and condenser. • Use copper piping with a brazing alloy with a minimum temperature of 1350°F (732°C), such as Sil-Fos. Use a flow of dry nitrogen through the piping to prevent the formation of copper oxide scale inside the piping. Avoid soft solders such as 50/50 or 95/5. • Isolate piping from building...

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