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For an unbalanced 3-phase supply voltage, use the follow-
ing formula to determine the percent of voltage imbalance:
Percent Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 V
BC = 464 V
AC = 455 V
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 V
(BC) 464 – 457 = 7 V
(AC) 457 – 455 = 2 V
Maximum deviation is 7 V.
Determine percent of voltage imbalance:
% Voltage Imbalance = 100 x
= 1.53%
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
POWER WIRING — Properly sized fuses or HACR (Heat-
ing, Air Conditioning and Refrigeration) circuit breakers must
be installed for branch circuit protection, according to the
national and applicable local codes. See unit nameplate and
Tables 9A and 9B for maximum overcurrent protection size.
These units are provided with single point, main power
supply terminal blocks. Refer to Fig. 2-14 for conduit connec-
tion locations. Connect the power leads as indicated on the unit
wiring diagrams (found in the Troubleshooting section) and be
certain to connect the ground lead to the ground lug in the unit
high voltage electrical box. Refer to Tables 9A and 9B for unit
electrical data.
Table 9A — Electrical Data — 50BVC,E,J,K,Q
LEGEND
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
7
457
IMPORTANT: If supply voltage phase imbalance is
more than 2%, contact the local electric utility com-
pany immediately.
UNIT SIZE
50BVC,E,J,K,Q
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
VOLTAGE
RANGE
COMPRESSOR
INDOOR FAN MOTOR
POWER
SUPPLY
DISCONNECT
SIZE
No. 1 No. 2
Min Max RLA LRA RLA LRA Qty
HP
(ea)
FLA
(ea)
MCA MOCP FLA
020
208/230 187 253 32.9 195 32.9 195 2
1.5 5.0 84.0 110 75.8
2 6.4 86.8 110 78.6
3 9.0 92.0 110 83.8
5 12.2 98.4 110 90.2
460 414 506 16.5 95 16.5 95 2
1.5 2.5 42.1 50 38.0
2 3.2 43.5 50 39.4
3 4.5 46.1 50 42.0
5 6.1 49.3 50 45.2
575 518 633 13.6 80 13.6 80 2
1.5 2.0 34.6 45 31.2
2 2.0 34.6 45 31.2
3 3.6 37.8 45 34.4
5 5.4 41.4 45 38.0
024
208/230 187 253 33.6 225 33.6 225 2
2 6.4 88.4 120 80.0
3 9.0 93.6 120 85.2
5 12.2 100.0 120 91.6
460 414 506 18.6 114 18.6 114 2
2 3.2 48.3 60 43.6
3 4.5 50.85 60 46.2
5 6.1 54.05 60 49.4
575 518 633 13.6 80 13.6 80 2
2 2.0 34.6 45 31.2
3 3.6 37.8 45 34.4
5 5.4 41.4 45 38.0
028
208/230 187 253 53.6 245 53.6 245 2
3 9.0 138.6 190 125.2
5 12.2 145.0 190 131.6
460 414 506 20.7 125 20.7 125 2
3 4.5 55.6 70 50.4
5 6.1 58.8 70 53.6
575 518 633 16.4 100 16.4 100 2
3 3.6 44.1 60 40.0
5 5.4 47.7 60 43.6
034
208/230 187 253 59.1 425 59.1 425 2 5 12.2 157.4 200 142.6
460 414 506 26.4 187 26.4 187 2 5 6.1 71.6 90 65.0
575 518 633 20.5 148 20.5 148 2 5 5.4 56.9 70 51.8
FLA — Full Load Amps
HP — Horsepower
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
RLA — Rated Load Amps