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Table 4B — Electrical Data — 50SX Units
UNIT SIZE
50SX
V-PH-Hz
VOLTAGE RANGE COMPRESSOR
OUTDOOR-
FAN
MOTOR
INDOOR-
FAN
MOTOR
POWER SUPPLY
AWG 60C
MIN WIRE
SIZE
MAX WIRE
LENGTH (ft)
Min Max RLA LRA FLA FLA MCA MOCP*
024 208/230-1-60 187 253 12.9 62.5 1.4 2.0 19.5 30 12 75
030 208/230-1-60 187 253 15.0 76.0 1.4 2.6 22.8 30 10 100
036
208/230-1-60 187 253 16.7 95.0 1.4 2.8 25.1 30 10 95
208/230-3-60 187 253 10.9 75.0 1.4 2.8 17.8 25 12 70
460-3-60 414 506 5.4 40.0 0.8 1.4 9.0 10 14 100
042
208/230-1-60 187 253 20.0 104.0 1.4 3.1 29.5 45 10 80
208/230-3-60 187 253 13.9 88.0 1.4 3.1 21.9 30 10 60
460-3-60 414 506 6.8 44.0 0.8 1.6 10.9 15 14 100
048
208/230-1-60 187 253 26.4 129.0 1.4 7.2 41.6 60 6 100
208/230-3-60 187 253 15.0 99.0 1.4 7.2 27.4 40 10 70
460-3-60 414 506 8.2 49.5 0.8 2.3 13.4 20 14 100
060
208/230-1-60 187 253 32.1 169.0 2.1 7.2 49.4 60 6 100
208/230-3-60 187 253 19.3 123.0 2.1 7.2 33.4 50 8 90
LEGEND
AWG — American Wire Gage
BRKR — Breaker
CUL — Canadian Underwriters’ Laboratories
FLA — Full Load Amps
HACR — Heating, Air Conditioning and
Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
RLA — Rated Load Amps
*Fuse or HACR Breaker.
†Carrier Scroll Compressor.
**Copeland Scroll Compressor.
NOTES:
1. In compliance with NEC requirements for multimotor and combi-
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The CUL units may be fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table, de-
termine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%.
Use the following formula to determine
the percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452=5v
(BC) 464 – 457=7v
(AC) 457 – 455=2v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
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