Bryant 580G Installation, Start-Up And Service Instructions Manual page 12

VOLTAGE
UNIT NOMINAL
RANGE
SIZE VOLTAGE
580G,H (3 Ph 60 Hz)
Min Max RLA LRA RLA LRA
208/230 187
240 460 414
575 518
208/230 187
300 460 414
575 518
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
*Fuse or HACR circuit breaker.
or
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion load equipment (refer to NEC Articles 430 and 440), the over-
current 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
voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Table 3— Electrical Data — 580G,H240-360
COMPRESSOR
No. 1 No. 2
254 39.1 228 25.6 160
508 19.9 114 11.5 80
632 16.0 91 9.6 64
254 39.1 228 39.1 228
508 19.9 114 19.9 114
632 16.0 91 16.0 91
POWER
OFM IFM
EXHAUST
Qty Hp FLA
(ea) Hp FLA FLA LRA
5 16.7/ —
15.2 23.6 41.6
10 30.8/ —
2 1 5.3
28.0 23.6 41.6
15 46.2/ —
42.0 23.6 41.6
—
5 7.6
12.6 23.6
—
2 1 2.7 10 14.0
12.6 23.6
—
15 21.0
12.6 23.6
—
5 6.1
12.6 23.6
—
2 1 2.4 10 11.0
12.6 23.6
—
15 17.0
12.6 23.6
7.5 24.2/ —
22.0 23.6 41.6
10 30.8/ —
2 1 5.3
28.0 23.6 41.6
15 46.2/ —
42.0 23.6 41.6
—
7.5 11.0
12.6 23.6
—
2 1 2.7 10 14.0
12.6 23.6
—
15 21.0
12.6 23.6
—
7.5 9.0
12.6 23.6
—
2 1 2.4 10 11.0
12.6 23.6
—
15 17.0
12.6 23.6
EXAMPLE: Supply voltage is 460-3-60.
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 voltage imbalance.
% Voltage Imbalance = 100 x
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.
—12—
COMBUSTION
POWER SUPPLY
FAN MOTOR
FLA
— 0.96 101.8/100.3 125/125
0.96 125.4/123.9 150/150
— 0.96 115.9/113.1 150/150
0.96 139.5/136.7 175/175
— 0.96 131.3/127.1 150/150
0.96 154.9/150.7 175/175
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.96 122.8/120.6 150/150
0.96 146.4/144.2 175/175
— 0.96 129.4/126.6 150/150
0.96 153.0/150.2 175/175
— 0.96 144.8/140.6 175/175
0.96 168.4/164.0 200/200
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
— 0.50
0.50
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
7
457
= 1.53%
MCA MOCP*
49.4 60
62.0 80
55.8 70
68.4 80
62.8 80
75.4 90
40.5 50
53.1 60
45.4 60
58.0 70
51.4 60
64.0 80
61.2 80
73.8 90
64.2 80
76.8 90
71.2 90
83.8 100
49.8 60
62.4 70
51.8 60
64.4 80
57.8 70
70.4 80