Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual page 47

581B090-150 STANDARD MOTOR (Units Without Electrical Convenience Outlet)
VOLTAGE
NOMINAL
UNIT
VOLTAGE
581B
(V-Ph-Hz)
Min
208/230-3-60 187
090 460-3-60 414
575-3-60 518
208/230-3-60 187
102 460-3-60 414
575-3-60 518
208/230-3-60 187
120 460-3-60 414
575-3-60 518
208/230-3-60 187
150 460-3-60 414
575-3-60 518
581B090-150 STANDARD MOTOR (Units With Electrical Convenience Outlet)
VOLTAGE
NOMINAL
UNIT
VOLTAGE
581B
(V-Ph-Hz)
Min
208/230-3-60 187
090 460-3-60 414
575-3-60 518
208/230-3-60 187
102 460-3-60 414
575-3-60 518
208/230-3-60 187
120 460-3-60 414
575-3-60 518
208/230-3-60 187
150 460-3-60 414
575-3-60 518
LEGEND
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
*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
max voltage deviation from average voltage
= 100 x
average voltage
ELECTRICAL DATA (cont)
COMPRESSOR
RANGE
Max RLA LRA
254 12.4 88.0
508 6.4 44.0
632 4.8 34.0
254 15.0 99.0
508 8.2 49.5
632 5.8 40.0
254 18.9 125.0
508 9.0 62.5
632 7.1 50.0
254 19.0 156.0
508 9.0 70.0
632 7.4 54.0
COMPRESSOR
RANGE
Max RLA LRA
254 12.4 88.0
508 6.4 44.0
632 4.8 34.0
254 15.0 99.0
508 8.2 49.5
632 5.8 40.0
254 18.9 125.0
508 9.0 62.5
632 7.1 50.0
254 19.0 156.0
508 9.0 70.0
632 7.4 54.0
COMBUSTION
OFM IFM
FAN MOTOR
FLA FLA FLA
1.4 7.5 .57
0.7 3.4 .30
0.7 3.4 .30
1.4 7.5 .57
0.7 3.4 .30
0.7 3.4 .30
1.4 10.6 .57
0.7 4.8 .30
0.7 4.8 .30
1.4 15.0 .57
0.7 7.4 .30
0.7 7.4 .30
COMBUSTION
OFM IFM
FAN MOTOR
FLA FLA FLA
1.4 7.5 .57
0.7 3.4 .30
0.7 3.4 .30
1.4 7.5 .57
0.7 3.4 .30
0.7 3.4 .30
1.4 10.6 .57
0.7 4.8 .30
0.7 4.8 .30
1.4 15.0 .57
0.7 7.4 .30
0.7 7.4 .30
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
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
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.
47
POWER
SUPPLY
WITH OUTLET
MCA MOCP FLA
38.2/38.2 45/45† 40/40
19.2 25†
14.6 20†
44.1/44.1 50/50† 46/46
23.3 30†
16.9 20†
55.9/55.9 60/60† 59/59
26.5 30†
20.9 25†
60.6/60.6 70/70 64/64
29.1 35†
23.7 30†
POWER
SUPPLY
WITH OUTLET
MCA MOCP FLA
44.2/44.2 50/50† 46/46
21.9 25†
16.8 20†
50.1/50.1 60/60† 52/52
26.0 30†
19.1 25†
61.9/61.9 70/70 64/64
29.2 35†
23.1 25†
66.6/66.6 80/70 70/70
31.8 35†
25.9 30†
452 + 464 + 455
3
1371
=
3
= 457
7
457
= 1.53%
MINIMUM UNIT
DISCONNECT
SIZE*
LRA
242/242
20 121
16 95
264/264
24 132
18 107
341/341
28 171
22 136
426/426
31 197
25 154
MINIMUM UNIT
DISCONNECT
SIZE*
LRA
247/247
23 124
18 97
269/269
27 135
20 109
345/345
30 173
24 139
430/430
33 199
27 156