Bryant 548F User Manual
Page 94
94
ELECTRICAL DATA (cont)
UNITS WITH 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
—
/—
—
/—
43.0/ 43.0
45/ 45**
46/ 46
247/247
7.8/10.4
21.7/ 25.0
70.1/ 74.3
80/ 80
71/ 75
269/272
12.0/16.0
33.3/ 38.5
84.6/ 91.1
90/100
84/ 90
280/285††
18.6/24.8
51.6/ 59.7
107.5/117.6
110/125
105/115
298/307††
24.0/32.0
66.6/ 77.0
126.3/139.3
150/150
122/134
313/324††
31.8/42.4
88.3/102.0
153.4/170.5
175/175
147/163
335/349††
460-3-60
414
508
6.4
44.0
0.7
3.4
—
—
21.4
25**
23
123
13.9
16.7
42.3
45**
42
140
16.5
19.8
46.1
50**
46
143
27.8
33.4
63.1
70
61
157
33.0
39.7
71.0
80
68
163
41.7
50.2
84.1
90
80
174††
120***
(10 Tons)
208/230-3-60 187
254
19.3
123.0
1.4
10.6
—
/—
—
/—
61.6/ 61.6
70/ 70
65/ 65
341/341
7.8/10.4
21.7/ 25.0
88.8/ 92.9
90/100
90/ 94
363/366††
12.0/16.0
33.3/ 38.5 103.3/109.6
110/110
104/110
375/380††
24.0/32.0
66.6/ 77.0 144.9/157.9
150/175
142/154
408/418††
31.8/42.4
88.3/102.0 172.0/189.1
175/200
167/183
430/443††
37.6/50.0 104.4/120.3 192.1/181.9
200/200
185/204
446/462††
460-3-60
414
508
10.0
62.0
0.7
4.8
—
—
30.9
35**
33
172
16.5
19.8
55.6
60**
55
191
27.8
33.4
72.6
80
71
205
33.0
39.7
80.5
90
78
211
41.7
50.2
93.6
100
90
222††
50.0
60.1
91.0
100
102
232††
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