Emerson Liebert MC Microchannel Outdoor Condenser 28 - 220kW 用户手册
Electrical Connections
Liebert
®
MC
™
20
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
• 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
• 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
Protection Device, Amps
15
15
15
15
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.
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
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
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
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
A
Winding
B
Winding
C
Wye Power Supply Connection
Winding
A-B
Winding
C-A
Winding B-C
Phase A
Phase B
Phase C
Delta Power Supply Connection