Bryant 575A User Manual
Page 7
Table 4 — Electrical Data
UNIT
575A
NOMINAL VOLTAGE
(V-Ph-Hz)
VOLTAGE RANGE
COMPRESSOR
OFM
POWER SUPPLY
MINIMUM DISCONNECT
Min
Max
RLA
LRA
FLA
MCA
MAX FUSE OR
HACR BRKR AMPS
FLA
LRA
090
208/230-3-60
187
254
31.5
160
3.1
42.5
50
45
177
460-3-60
414
508
15.7
80
1.4
21.0
25
25
89
LEGEND
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA
— Locked Rotor Amps
MCA
— Minimum Circuit Amps
NEC
— National Electrical Code
OFM
— Outdoor Fan Motor
RLA
— Rated Load Amps
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion load equipment (refer to NEC Articles 430 and 440), the over-
current 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
voltage imbalance.
max voltage deviation from average voltage
= 100 x
average voltage
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
=
457
(AB) 457
Ϫ
452 = 5 v
(BC) 464
Ϫ
457 = 7 v
(AC) 457
Ϫ
455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance
7
% Voltage Imbalance = 100
457
= 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.
Table 5 — Accessory Electric Heater Data
UNIT
524A-H
NOMINAL kW
V-PH-HZ
HEATER
PART NO.
HEATER
AMPS
MCA*
MOCP*
090
5
240-3-60
CAELHEAT001A00
12.0
25.6
30
480-3-60
CAELHEAT002A00
6.0
12.3
15
10
240-3-60
CAELHEAT004A00
24.1
40.7
50
480-3-60
CAELHEAT005A00
12.0
19.8
25
15
240-3-60
CAELHEAT007A00
36.0
55.7
80
480-3-60
CAELHEAT008A00
18.0
27.4
40
25
240-3-60
CAELHEAT010A00
60.1
85.8
125
480-3-60
CAELHEAT011A00
30.1
42.4
60
35
240-3-60
CAELHEAT013A00
84.0
115.8
175
480-3-60
CAELHEAT014A00
42.1
57.4
80
LEGEND
MCA
— Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection (Amps)
*Sizes shown are for single-point connection of electric heat accessory
and air handler.
NOTES:
1. MCA and MOCP values apply to both standard and alternate factory-
supplied motors.
2. Electrical resistance heaters are rated at 240 v or 480 v. To deter-
mine heater capacity (kW) at unit nameplate voltage, multiply 240-v
or 480-v capacity by multipliers found in table below.
HEATER RATING
VOLTAGE
ACTUAL SITE VOLTAGE
200
208
230
240
400
440
460
480
240
.694
.751
.918
1
—
—
—
—
480
—
—
—
—
.694
.840
.918
1
NOTE: The following equation converts kW of heat energy to Btuh:
kW x 3,412 = Btuh.
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