Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B - Manual (Page 46)

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