Emerson Figure i Manuel D’Utilisation

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.

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.

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.

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.

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

Three-phase power must be connected to the unit line voltage terminals in proper sequence so 

that scroll compressor rotates in the correct direction.

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.

53 - 95 PSIG

(365 to 655 kPa)

280 psig (1930 kPa)

400 psig (2760 kPa)

-10%

+10%

-30°F (-34°C)

115°F (46°C) Std

Ambient & Quiet-Line

-5% 208/230V

single-phase

125°F (52°C)

High Ambient Models 

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.