Emerson Liebert MC Microchannel Outdoor Condenser 28 - 220kW Manuel D’Utilisation

Electrical Connections

Liebert

™

4.1.1 Wye vs. Delta Connection Power Supply

Figure 15 Wye vs. Delta power supply connection diagram

Acceptable Power Supplies—208V to 480V Nominal Units

• 208V wye with solidly grounded neutral and 120V line-to-ground
• 380V wye with solidly grounded neutral and 220V line-to-ground
• 480V wye with solidly grounded neutral and 277V line-to-ground

Unacceptable Power Supplies—208V to 480V Nominal Units

• Wye with high-resistance (or impedance) ground
• Delta without ground or with floating ground
• Delta with corner ground
• Delta with grounded center tap

Table 5

Electrical data, Liebert Lee-Temp

™

receiver, 60Hz

Rated Voltage - Single-Phase

120 208/230

Watts/Receiver

150

300

150

300

Amps

1.4

2.8

0.7

1.4

Wire Size Amps

1.8

3.5

0.9

1.8

Maximum Overcurrent
Protection Device, Amps

The Liebert Lee-Temp receiver requires a separate power feed for heaters. The condenser
is not designed to supply power to the receiver heater pads.

NOTE
The Liebert MC Condenser is designed to operate with Wye-connected power with a solidly

grounded neutral.
The Liebert MC condenser Premium EC Fan Models will not operate properly with

Delta-connected power. A field-supplied isolation transformer or other power solutions will be

needed to for proper condenser function.

NOTE
The electronically commutated motors included in the Liebert MC are suitable for connection to

power supplies with a solidly grounded neutral.

Phase A

Phase B

Phase C

Neutral

Winding

Wye Power Supply Connection

Winding

A-B

Winding

C-A

Winding B-C

Phase A

Phase B

Phase C

Delta Power Supply Connection