148 electrical data (cont) – Bryant DURAPAC 551B User Manual
Page 148
148
ELECTRICAL DATA (cont)
ELECTRICAL DATA — 558F180-300 (cont)
LEGEND AND NOTES FOR ELECTRICAL DATA TABLES
LEGEND
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and
600 v. Heaters are rated at 240 v, 480 v, or 600 v. If power distribution voltage to
unit varies from rated heater voltage, heater kW will vary accordingly. To deter-
mine heater capacity at actual unit voltage, multiply 240 v, 480 v, or 600 v capac-
ity by multipliers found in table on page 130. Electric heaters are field installed.
†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. The 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 of 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.
= 1.53%
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.
3. MCA calculation for 558F180-300 units with electric heaters over 50 kW =
(1.25 x IFM amps) + (1.00 x heater FLA).
UNIT
558F
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
POWER
EXHAUST
ELECTRIC
HEAT*
POWER SUPPLY
NO. 1
NO.2
Min
Max
RLA
LRA
RLA
LRA
Qty
Hp
FLA
(ea)
Hp
FLA
FLA
LRA
kW
FLA
MCA
MOCP†
240
208/230
187
253
42
239
33.6
225
2
1
6.6
7.5
25.0/25.0
—
—
—
—
124/124
150/150
4.6
18.8
—
—
129/129
150/150
—
—
26/34
71/ 82
124/134
150/150
4.6
18.8
26/34
71/ 82
129/140
150/150
—
—
42/56
117/135
178/166
200/175
4.6
18.8
42/56
117/135
183/172
200/175
—
—
56/75
156/180
187/211
200/225
4.6
18.8
56/75
156/180
193/217
200/225
460
414
508
19.2
125
17.3
114
2
1
3.3
7.5
13.0
—
—
—
—
61
80
2.3
6
—
—
63
80
—
—
32
39
65
80
2.3
6
32
39
68
80
—
—
55
66
82
90
2.3
6
55
66
85
90
—
—
80
96
112
125
2.3
6
80
96
115
125
300
208/230
187
253
41.4
312
47.1
245
6
0.5
1.7
10.0
28.0/28.0
—
—
—
—
138/138
175/175
4.6
18.8
—
—
143/143
175/175
—
—
26/34
71/ 82
138/138
175/175
4.6
18.8
26/34
71/ 82
143/143
175/175
—
—
42/56
117/135
181/170
200/175
4.6
18.8
42/56
117/135
187/176
200/200
—
—
56/75
156/180
191/215
200/225
4.6
18.8
56/75
156/180
197/221
200/225
460
414
508
20
150
19.6
125
6
0.5
0.8
10.0
14.6
—
—
—
—
64
80
2.3
6
—
—
66
80
—
—
32
39
67
80
2.3
6
32
39
70
80
—
—
55
66
84
90
2.3
6
55
66
87
100
—
—
80
96
114
125
2.3
6
80
96
117
125
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
0
T
F
Q
0
04
-0
12
55
8F1
80-
30
0