Bryant 581A/B - Manual (Page 166)

166
ELECTRICAL DATA
LEGEND
*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 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 per-
cent voltage imbalance.
% Voltage Imbalance
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.
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.
UNIT
579F
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM IFM
POWER
EXHAUST
COMBUSTION
FAN MOTOR
POWER
SUPPLY No. 1 No. 2
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP*
180
(15 Tons)
208/230 187 253 28.8 195 28.8 195 3 0.5 1.7 3.7 10.5/11.0
— — 0.57 81/81 100/100
4.6 18.8 0.57 85/86 110/110
460 414 508 14.7 95 14.7 95 3 0.5 0.8 3.7 4.8
— — 0.30 40 50
2.3 6.0 0.30 43 50
575 518 633 10.8 80 10.8 80 3 0.5 0.8 3.0 3.9
— — 0.57 30 40
2.1 4.8 0.57 32 40
216
(18 Tons)
208/230 187 253 30.1 225 28.8 195 3 0.5 1.7 5.0 15.8/15.8
— — 0.57 87/87 110/110
4.6 18.8 0.57 92/92 110/110
460 414 508 15.5 114 14.7 95 3 0.5 0.8 5.0 7.9
— — 0.30 44 50
2.3 6.0 0.30 47 60
575 518 633 12.1 80 10.8 80 3 0.5 0.8 5.0 6.0
— — 0.57 34 40
2.1 4.8 0.57 36 40
240
(20 Tons)
208/230 187 253 37.8 239 30.1 225 2 1 6.6 7.5 25.0/25.0
— — 0.57 116/116 150/150
4.6 18.8 0.57 120/120 150/150
460 414 508 17.2 125 15.5 114 2 1 3.3 7.5 13.0
— — 0.30 57 70
2.3 6.0 0.30 59 70
575 518 633 12.4 80 12.1 80 2 1 3.4 7.5 10.0
— — 0.57 44 50
2.1 4.8 0.57 46 50
300
(25 Tons)
208/230 187 253 41.0 350 37.8 239 2 1 6.6 10.0 28.0/28.0
— — 0.57 130/130 150/150
4.6 18.8 0.57 135/135 175/175
460 414 508 21.8 158 17.2 125 2 1 3.3 10.0 14.6
— — 0.30 66 80
2.3 6.0 0.30 68 80
575 518 633 17.3 125 12.4 80 2 1 3.4 10.0 13.0
— — 0.57 54 70
2.1 4.8 0.57 56 70
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
= 100 x
max voltage deviation from average voltage
average voltage
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage = 452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457
= 1.53%
0TF
Q004
-0
12
5
7
9
F
18
0-
300