Emerson Figure i manual Electrical Connections, Low-Voltage Control Wire Connections

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Installation

2.6Electrical Connections

Each unit is shipped from the factory with all internal wiring completed. All power, control wiring and ground connections must be made in accordance with the National Electrical Code and local codes. Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to Figures 5, 7 and 8 and electrical schematic (reference Figures 9 through 11) when making connec- tions. A manual electrical disconnect switch should be installed within 5 feet (1.6 m) of the unit in accordance with codes.

! WARNING

Use voltmeter to be sure power is turned off before making any electrical connections.

! CAUTION

Three-phase power must be connected to the unit line voltage terminals in proper sequence so that scroll compressor rotates in the correct direction.

The three-phase scroll compressor requires proper phasing to ensure correct motor rotation. The com- ponent connections have been phase synchronized at the factory. Power phasing should be changed only at the line voltage supply to the unit. To change phasing, switch any two power leads to the unit. Observe system pressures to determine whether the unit is operating properly.

! CAUTION

Apply power to condenser 8 hours before operating system. This time is required to allow liquid refrigerant to be driven out of the compressor. This is especially important at low ambient temperatures. The compressor crankcase heater is energized as long as power is supplied to the unit.

Table 13 Design refrigerant pressures

Suction

53 - 95 PSIG

(365 to 655 kPa)

 

 

 

Discharge

280 psig (1930 kPa)

(At Design Ambient)

 

High Pressure Cutout

400 psig (2760 kPa)

Table 14 Application limits

Input voltage

Dry Bulb Air Temperature at Condenser

 

 

 

 

Minimum

Maximum

Minimum

Maximum

 

 

 

 

-10%

 

 

115°F (46°C) Std

 

 

Ambient & Quiet-Line

 

+10%

-30°F (-34°C)

-5% 208/230V

125°F (52°C)

 

 

single-phase

 

 

High Ambient Models

 

 

 

 

2.6.1Low-Voltage Control Wire Connections

Field-supplied four-wire control connection (10-wire on 8-ton units) is required between the outdoor condensing unit and the evaporator. Refer to Figures 5, 7 and 8 and to unit electrical schematic and Figures 9 through 11.

2.6.2Low-Voltage Control Wire Sizing

Low-voltage wiring should be sized to allow a 1 volt maximum drop due to line resistance between the evaporator and condensing unit. Use NEC Class 1 or 2 wiring according to wire routing conditions chosen, local codes and application limits in Tables 14 and 15.

Table 15 Recommended minimum wire size

Max. Distance*

Min. Wire Gauge

ft. (m)

AWG (mm2)

 

 

50 (15)

20 (0.75)

 

 

100 (30)

18 (1.0)

 

 

150 (45)

16 (1.5)

 

 

*One-way control wire run between outdoor condensing unit and evaporator.

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Contents Liebert Prop Fan Condensing Unit = 380/415-3ph-50Hz Example PFH037A-PL7Table of Contents Figures Optional Equipment Prop Fan Condensing UnitsLocation Considerations Equipment InspectionNet Weight Dimensional DataModel Numbers Dimensional Data, in. mm Lb. kg 60Hz 50Hz Cabinet and floor planning data, horizontal air dischargeFootprint Dimensions Wall Mounting Electrical and piping connections, horizontal air discharge Piping and Electrical ConnectionsPFH096A- L 152General piping arrangement Top Air Discharge Models Electrical field connections, 1- to 5-ton unitsElectrical field connections, 8-ton units Single-phase, 1-3 ton model schematic, typical Three-phase, 3-5 ton model schematic, typical Three-phase, 8 ton model schematic, typical Piping for Elevation Differences between PFH and Evaporator Piping ConsiderationsCondensing Unit EvaporatorEquivalent lengths for various pipe fittings, ft m Field-Fabricated Line Sets Pre-Charged Line SetsRefrigerant charge in Liebert pre-charged R-407C line sets Line Size Length Charge R-407C Ft. m Lb-oz kgRecommended line sizes, OD Cu Liebert PFH unit charge levels and coupling sizePiping connection sizes and torque Installation of Piping to UnitsLine charges refrigerant per 100 ft m of Type L copper tube Line Size OD Cu Coupling Size Torque, lb-ft. N-mInstall the New Condensing Unit Filter Drier Selection and InstallationRemove Existing Condensing Unit Evaporator Charge Levels General System Charge RequirementsEvaporator Charge R-407C Indoor Unit Models Oz kg Low-Voltage Control Wire Sizing Low-Voltage Control Wire ConnectionsElectrical Connections Nominal Input Voltage-Phase Capacity Electrical Nominal Input Voltage- Phase Capacity ElectricalElectrical Data Electrical data-High ambient models 105F/41C 60HzElectrical data-High ambient models 105F/41C 50Hz Electrical data-Quiet-Line models 95F/35C 60HzElectrical data Quiet-Line models 95F/35C 50Hz Checklist for Completed InstallationHigh Head Pressure CompressorLiebert Lee-Temp Flood Back Head Pressure Control Hot Gas Bypass AdjustmentOperation Hot gas bypass diagram Compressor Failure GeneralElectrical Failure-Burnout Mechanical FailureCompressor Replacement Field verification charge Field Charge VerificationModel Numbers 407C 60 Hz 50 Hz Oz kg Problem Cause Remedy TroubleshootingWeb Site Monitoring Single-Phase&Three-Phase UPS Environmental SystemsUni Etwo