25
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