Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual page 48

581B090-120 HIGH-STATIC 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
581B090-120 HIGH-STATIC 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
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
— Indoor (Evaporator) Fan Motor
IFM
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, Canada 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 (each)
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 17.3 125.0
508 9.0 62.0
632 7.1 50.0
COMPRESSOR
RANGE (each)
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 17.3 125.0
508 9.0 62.0
632 7.1 50.0
COMBUSTION
OFM IFM
FAN MOTOR
FLA FLA RLA
1.4 10.6 0.6
0.7 4.8 0.3
0.7 4.8 0.3
1.4 10.6 0.6
0.7 4.8 0.3
0.7 4.8 0.3
1.4 15.0 0.6
0.7 7.4 0.3
0.7 7.4 0.3
COMBUSTION
OFM IFM
FAN MOTOR
FLA FLA RLA
1.4 10.6 0.6
0.7 4.8 0.3
0.7 4.8 0.3
1.4 10.6 0.6
0.7 4.8 0.3
0.7 4.8 0.3
1.4 15.0 0.6
0.7 7.4 0.3
0.7 7.4 0.3
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
= 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.
48
MINIMUM UNIT
POWER
DISCONNECT
SUPPLY
SIZE*
MCA MOCP FLA
41.3 45† 44
20.6 25† 22
15.8 20† 17
47.2 60† 50
24.7 30† 26
18.0 20† 19
56.7 70 61
29.1 35† 29
23.0 25† 23
MINIMUM UNIT
POWER
DISCONNECT
SUPPLY
SIZE*
MCA MOCP FLA
47.3 50† 49
23.3 25† 24
18.5 20† 19
53.2 60† 55
27.4 30† 28
20.7 25† 21
62.7 70 66
31.8 35† 32
25.7 30† 25
452 + 464 + 455
3
1371
=
3
= 457
7
457
LRA
267
134
95
264
132
107
360
181
136
LRA
267
134
95
264
132
107
360
181
147