Bryant 548F User Manual
Page 92
92
ELECTRICAL DATA (cont)
UNITS WITHOUT ELECTRICAL CONVENIENCE OUTLET (cont)
LEGEND AND NOTES FOR ELECTRICAL DATA TABLES
LEGEND
*Used to determine minimum disconnect per NEC.
†Heater capacity (kW) is based on heater voltage of 208 v and 480 v. If
power distribution voltage to unit varies from rated heater voltage,
heater kW will vary accordingly.
**Fuse or HACR circuit breaker.
††Optional disconnect switch cannot be used.
***Units have 2 outdoor fan motors.
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion load and equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
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.
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
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
UNIT
549B
NOMINAL
VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR OFM
IFM
ELECTRIC
HEAT*
POWER
SUPPLY
MINIMUM UNIT
DISCONNECT
SIZE
Min Max
RLA
LRA
FLA
FLA
kW†
FLA
MCA
MOCP
FLA
LRA
090***
(7
1
/
2
Tons)
208/230-3-60 187
254
12.4
88.0
1.4
7.5
—
/—
—
/—
38.2/ 38.2
40/ 40**
40/ 40
242/242
7.8/10.4
21.7/ 25.0
65.3/ 69.5
70/ 70
65/ 69
264/267
12.0/16.0
33.3/ 38.5
79.8/ 86.3
80/ 90
79/ 85
275/281††
18.6/24.8
51.6/ 59.7
102.7/112.8
110/125
100/109
294/302††
24.0/32.0
66.6/ 77.0
121.5/134.5
125/150
117/129
309/319††
31.8/42.4
88.3/102.0
148.6/165.7
150/175
142/158
330/344††
460-3-60
414
508
6.4
44.0
0.7
3.4
—
—
19.2
20**
20
121
13.9
16.7
40.1
45**
39
138
16.5
19.8
44.0
45**
43
141
27.8
33.4
61.0
70
59
155
33.0
39.7
68.8
70
66
161
41.7
50.2
82.0
90
78
171
120***
(10 Tons)
208/230-3-60 187
254
19.3
123.0
1.4
10.6
—
/—
—
/—
56.8/ 56.8
60/ 60**
60/ 60
337/337
7.8/10.4
21.7/ 25.0
84.0/ 88.1
90/ 90
85/ 89
358/362††
12.0/16.0
33.3/ 38.5
98.5/105.0
100/110
98/104
370/375††
24.0/32.0
66.6/ 77.0 140.1/153.1
150/175
136/148
403/414††
31.8/42.4
88.3/102.0 167.2/184.3
175/200
161/177
425/439††
37.6/50.0 104.4/120.3 187.3/177.1
200/200
180/198
441/457††
460-3-60
414
508
10.0
62.0
0.7
4.8
—
—
28.7
30
30
170
16.5
19.8
53.3
60
53
189
27.8
33.4
70.5
80
69
203
33.0
39.7
78.3
80
76
209
41.7
50.2
91.5
100
88
220††
50.0
60.1
88.8
100
99
230††
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM
— Indoor Fan Motor
LRA
— Locked Rotor Amps
MCA
— Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC
— National Electrical Code
OFM
— Outdoor Fan Motor
RLA
— Rated Load Amps
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
7
457
50
T
F
Q
0
04
-0
12
5
49B
036
-120