Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual page 46

581B036-072 HIGH-STATIC MOTOR (Units Without Electrical Convenience Outlet)
VOLTAGE
NOMINAL
UNIT
RANGE
VOLTAGE
581B
(V-Ph-Hz)
Min
208/230-3-60 187
036 460-3-60 414
575-3-60 518
208/230-3-60 187
048 460-3-60 414
575-3-60 518
208/230-3-60 187
060 460-3-60 414
575-3-60 518
208/230-3-60 187
072 460-3-60 414
575-3-60 518
581B036-072 HIGH-STATIC MOTOR (Units With Electrical Convenience Outlet)
VOLTAGE
NOMINAL
UNIT
RANGE
VOLTAGE
581B
(V-Ph-Hz)
Min
208/230-3-60 187
036 460-3-60 414
575-3-60 518
208/230-3-60 187
048 460-3-60 414
575-3-60 518
208/230-3-60 187
060 460-3-60 414
575-3-60 518
208/230-3-60 187
072 460-3-60 414
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.
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. UL,
Canada 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.
max voltage deviation from average voltage
= 100 x
average voltage
ELECTRICAL DATA (cont)
COMPRESSOR
OFM
(each)
Max RLA LRA FLA
254 10.3 77.0
508 5.1 39.0
632 4.2 31.0
254 13.5 99.0
508 7.4 49.5
632 5.8 40.0
254 17.3 123.0
508 9.0 62.0
632 7.1 50.0
254 20.5 156.0
508 9.6 70.0
632 7.7 56.0
COMPRESSOR
OFM
(each)
Max RLA LRA FLA
254 10.3 77.0 0.7
508 5.1 39.0 0.4
632 4.2 31.0 0.4
254 13.5 99.0 0.7
508 7.4 49.5 0.4
632 5.8 40.0 0.4
254 17.3 123.0 1.5
508 9.0 62.0 0.8
632 7.1 50.0 0.8
254 20.5 156.0 1.4
508 9.6 70.0 0.6
632 7.7 56.0 0.6
COMBUSTION
IFM
FAN MOTOR
FLA RLA
0.7 5.8 0.6
0.4 2.6 0.3
0.4 2.6 0.3
0.7 5.8 0.6
0.4 2.6 0.3
0.4 2.6 0.3
1.5 7.5 0.6
0.8 3.4 0.3
0.8 3.4 0.3
1.4 7.5 0.6
0.6 3.4 0.3
0.6 3.4 0.3
COMBUSTION
IFM
FAN MOTOR
FLA RLA
5.8 0.6
2.6 0.3
2.6 0.3
5.8 0.6
2.6 0.3
2.6 0.3
7.5 0.6
3.4 0.3
3.4 0.3
7.5 0.6
3.4 0.3
3.4 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
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.
46
MINIMUM UNIT
POWER
DISCONNECT
SUPPLY
MCA MOCP† FLA
19.4/19.4 25/25 19/19
9.4 15
7.7 15
23.4/23.4 30/30 23/23
12.3 15 12
9.7 15
30.6/30.6 35/35 30/30
15.5 20 15
12.2 15 12
30.6/30.6 35/35 30/30
15.5 20 15
12.2 15 12
MINIMUM UNIT
POWER
DISCONNECT
SUPPLY
MCA MOCP† FLA
25.4/25.4 30/30 25
12.1 15 12
9.8 15 10
29.4/29.4 35/35 29
15.0 20 14
11.8 15 11
36.6/36.6 40/40 36
18.2 20 18
14.4 20 14
40.5/40.5 45/45 39
18.7 25 18
15.0 20 15
452 + 464 + 455
3
1371
=
3
= 457
7
457
= 1.53%
SIZE*
LRA
120/120
9 60
8 48
142/142
71
9 57
187/187
94
76
187/187
94
76
SIZE*
LRA
124/124
63
50
146/146
73
59
192/192
96
77
224/224
104
89