581a210-300 – Bryant 581A/B User Manual
Page 245
245
ELECTRICAL DATA — 581A (cont)
ELECTRICAL DATA — 581A210-300 WITHOUT CONVENIENCE OUTLET
LEGEND
*Fuse or HACR circuit breaker.
NOTES:
1.
In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit breaker.
2.
Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
Use the following formula to determine the percent of voltage imbalance.
% 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.
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.
UNIT
581A
NOMINAL
VOLTAGE
(3 Ph,
60 Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
POWER
EXHAUST
COMBUSTION
FAN MOTOR
POWER SUPPLY
DISCONNECT
SIZE
No. 1
No. 2
No. 3
Min
Max
RLA
LRA
RLA
LRA
RLA
LRA
Qty
Hp
FLA
(ea)
Hp
FLA
Qty
Hp
FLA
(ea)
FLA
MCA
MOCP*
FLA
210
208/230
187
253
16.7
130
16.7
130
22.4
184
4
0.25
1.5
3.7
10.6/ 9.6
—
—
—
0.5
78/ 77
100/ 90
83/ 82
2
1
5.9
90/ 89
100/100
97/ 96
5
16.7/15.2
—
—
—
84/ 83
100/100
90/ 89
2
1
5.9
96/ 94
100/100
104/102
7.5
24.2/22
—
—
—
92/ 89
100/100
99/ 96
2
1
5.9
104/101
125/110
112/110
460
414
506
9
70
9
70
10.7
90
4
0.25
0.7
3.7
4.8
—
—
—
0.3
39
45
42
2
1
3.1
45
50
49
5
7.6
—
—
—
42
50
45
2
1
3.1
48
50
52
7.5
11
—
—
—
45
50
49
2
1
3.1
51
60
56
575
518
633
7
55
7
55
9.3
73
4
0.25
0.7
3
3.9
—
—
—
0.24
32
40
35
2
1
2.4
37
45
40
5
6.1
—
—
—
35
40
37
2
1
2.4
39
45
43
7.5
9
—
—
—
37
45
40
2
1
2.4
42
50
46
240
208/230
187
253
22.4
184
22.4
184
22.4
184
4
0.25
1.5
3.7
10.6/ 9.6
—
—
—
0.5
89/ 88
100/100
96/ 95
2
1
5.9
101/100
110/110
110/109
5
16.7/15.2
—
—
—
96/ 94
100/100
103/102
2
1
5.9
107/106
125/125
117/115
7.5
24.2/22
—
—
—
103/101
125/110
112/109
2
1
5.9
115/113
125/125
126/123
10
30.8/28
—
—
—
112/108
125/125
120/116
2
1
5.9
124/120
150/125
133/130
460
414
506
10.7
90
10.7
90
10.7
90
4
0.25
0.7
3.7
4.8
—
—
—
0.3
42
50
46
2
1
3.1
49
50
53
5
7.6
—
—
—
45
50
49
2
1
3.1
51
60
56
7.5
11
—
—
—
49
50
53
2
1
3.1
55
60
60
10
14
—
—
—
52
60
56
2
1
3.1
59
60
63
575
518
633
9.3
73
9.3
73
9.3
73
4
0.25
0.7
5
6.1
—
—
—
0.24
39
45
42
2
1
2.4
44
50
48
7.5
9
—
—
—
42
50
46
2
1
2.4
47
50
51
10
11
—
—
—
44
50
48
2
1
2.4
49
60
53
300
208/230
187
253
47.1
245
47.1
245
—
—
6
0.25
1.5
5
16.7/15.2
—
—
—
0.5
132/130
175/175
138/136
2
1
5.9
143/142
175/175
151/150
7.5
24.2/22
—
—
—
139/137
175/175
147/144
2
1
5.9
151/149
175/175
160/158
10
30.8/28
—
—
—
146/143
175/175
154/151
2
1
5.9
158/155
200/200
168/164
460
414
506
19.6
125
19.6
125
—
—
6
0.25
0.7
5
7.6
—
—
—
0.3
56
60
59
2
1
3.1
62
80
66
7.5
11
—
—
—
59
60
63
2
1
3.1
66
80
70
10
14
—
—
—
62
80
66
2
1
3.1
69
80
73
575
518
633
15.8
100
15.8
100
—
—
6
0.25
0.7
5
6.1
—
—
—
0.24
46
60
48
2
1
2.4
51
60
54
7.5
9
—
—
—
49
60
52
2
1
2.4
54
60
57
10
11
—
—
—
51
60
54
2
1
2.4
56
60
59
FLA
—
Full Load Amps
MCA —
Minimum Circuit Amps
HACR —
Heating, Air Conditioning and
MOCP—
Maximum Overcurrent Protection
Refrigeration
NEC —
National Electrical Code
IFM
—
Indoor (Evaporator) Fan Motor
OFM —
Outdoor (Condenser) Fan Motor
LRA
—
Locked Rotor Amps
RLA
—
Rated Load Amps
MCA
—
Minimum Circuit Amps
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
=
457
% Voltage Imbalance = 100 x
7
457
= 1.53%
5
81A1
55-
30
0