Bryant 581C - Manual (Page 197)

197
ELECTRICAL DATA
LEGEND
*Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent 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
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%, con-
tact 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%
579
F18
0
-300