Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual
Page 47
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ELECTRICAL DATA (cont)
581B090-150 STANDARD MOTOR (Units Without Electrical Convenience Outlet)
581B090-150 STANDARD MOTOR (Units With Electrical Convenience Outlet)
LEGEND
*Used to determine minimum disconnect per NEC.
†Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion load equipment (refer to NEC Articles 430 and 440), the overcur-
rent protective device for the unit shall be fuse or HACR breaker. The
UL, Canadian approved 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
= 457
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 below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
UNIT
581B
NOMINAL
VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
COMBUSTION
FAN MOTOR
POWER
SUPPLY
WITH OUTLET
MINIMUM UNIT
DISCONNECT
SIZE*
Min
Max
RLA
LRA
FLA
FLA
FLA
MCA
MOCP
FLA
LRA
090
208/230-3-60
187
254
12.4
88.0
1.4
7.5
.57
38.2/38.2
45/45†
40/40
242/242
460-3-60
414
508
6.4
44.0
0.7
3.4
.30
19.2
25†
20
121
575-3-60
518
632
4.8
34.0
0.7
3.4
.30
14.6
20†
16
95
102
208/230-3-60
187
254
15.0
99.0
1.4
7.5
.57
44.1/44.1
50/50†
46/46
264/264
460-3-60
414
508
8.2
49.5
0.7
3.4
.30
23.3
30†
24
132
575-3-60
518
632
5.8
40.0
0.7
3.4
.30
16.9
20†
18
107
120
208/230-3-60
187
254
18.9
125.0
1.4
10.6
.57
55.9/55.9
60/60†
59/59
341/341
460-3-60
414
508
9.0
62.5
0.7
4.8
.30
26.5
30†
28
171
575-3-60
518
632
7.1
50.0
0.7
4.8
.30
20.9
25†
22
136
150
208/230-3-60
187
254
19.0
156.0
1.4
15.0
.57
60.6/60.6
70/70
64/64
426/426
460-3-60
414
508
9.0
70.0
0.7
7.4
.30
29.1
35†
31
197
575-3-60
518
632
7.4
54.0
0.7
7.4
.30
23.7
30†
25
154
UNIT
581B
NOMINAL
VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
COMBUSTION
FAN MOTOR
POWER
SUPPLY
WITH OUTLET
MINIMUM UNIT
DISCONNECT
SIZE*
Min
Max
RLA
LRA
FLA
FLA
FLA
MCA
MOCP
FLA
LRA
090
208/230-3-60
187
254
12.4
88.0
1.4
7.5
.57
44.2/44.2
50/50†
46/46
247/247
460-3-60
414
508
6.4
44.0
0.7
3.4
.30
21.9
25†
23
124
575-3-60
518
632
4.8
34.0
0.7
3.4
.30
16.8
20†
18
97
102
208/230-3-60
187
254
15.0
99.0
1.4
7.5
.57
50.1/50.1
60/60†
52/52
269/269
460-3-60
414
508
8.2
49.5
0.7
3.4
.30
26.0
30†
27
135
575-3-60
518
632
5.8
40.0
0.7
3.4
.30
19.1
25†
20
109
120
208/230-3-60
187
254
18.9
125.0
1.4
10.6
.57
61.9/61.9
70/70
64/64
345/345
460-3-60
414
508
9.0
62.5
0.7
4.8
.30
29.2
35†
30
173
575-3-60
518
632
7.1
50.0
0.7
4.8
.30
23.1
25†
24
139
150
208/230-3-60
187
254
19.0
156.0
1.4
15.0
.57
66.6/66.6
80/70
70/70
430/430
460-3-60
414
508
9.0
70.0
0.7
7.4
.30
31.8
35†
33
199
575-3-60
518
632
7.4
54.0
0.7
7.4
.30
25.9
30†
27
156
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM
— Indoor (Evaporator) Fan Motor
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP— Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA
— Rated Load Amps
UL
— Underwriters’ Laboratories
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
7
457