Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48EJ Installation And Service Instructions Manual page 19

VOLTAGE
UNIT NOMINAL
RANGE
SIZE VOLTAGE
Min Max RLA LRA RLA LRA Qty Hp FLA
48E (3 Ph 60 Hz)
208/230 187 254
034 460 414 508
575 518 632
208/230 187 254
038 460 414 508
575 518 632
LEGEND
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
*Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combi-
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percent voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Table 4 — Electrical Data (cont)
COMPRESSOR
No. 1 No. 2
57.1 266 57.1 266 2
25.6 120 25.6 120 2
20.5 96 20.5 96 2
57.1 266 57.1 266 4
25.6 120 25.6 120 4
20.5 96 20.5 96 4
or
POWER
OFM IFM
EXHAUST
(ea) Hp FLA FLA LRA
—
10 30.8/
28.0
23.6 41.6
—
15 46.2/
1 5.3
42.0
23.6 41.6
—
20 59.4/
54.0
23.6 41.6
—
10 14.0
12.6 23.6
—
1 2.7 15 21.0
12.6 23.6
—
20 27.0
12.6 23.6
—
10 11.0
12.6 23.6
—
1 2.4 15 17.0
12.6 23.6
—
20 22.0
12.6 23.6
—
10 30.8/
28.0
23.6 41.6
—
46.2/
1 5.3 15
42.0
23.6 41.6
—
20 59.4/
54.0
23.6 41.6
—
10 14.0
12.6 23.6
—
1 2.7 15 21.0
12.6 23.6
—
20 27.0
12.6 23.6
—
10 11.0
12.6 23.6
—
1 2.4 15 17.0
12.6 23.6
—
20 22.0
12.6 23.6
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
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.
% Voltage Imbalance = 100 x
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.
19
COMBUSTION
POWER SUPPLY
FAN MOTOR
FLA MCA
— 0.96 169.9/167.1 225/200
0.96 193.5/190.7 250/225
— 0.96 185.3/181.1 225/225
0.96 208.9/204.7 250/250
— 0.96 198.5/193.1 250/250
0.96 222.1/216.7 275/250
— 0.50 77.0
0.50 89.6
— 0.50 84.0
0.50 96.6
— 0.50 90.0
0.50 102.6
— 0.50 61.9
0.50 74.5
— 0.50 67.9
0.50 80.5
— 0.50 72.9
0.50 85.5
— 0.96 180.5/177.7 225/225
0.96 204.1/201.3 250/250
— 0.96 195.9/191.7 250/225
0.96 219.5/215.3 275/250
— 0.96 209.1/203.7 250/250
0.96 232.7/227.3 275/275
— 0.50 82.4
0.50 95.0
— 0.50 89.4
0.50 102.0
— 0.50 95.4
0.50 108.0
— 0.50 66.7
0.50 79.3
— 0.50 72.7
0.50 85.3
— 0.50 77.7
0.50 90.3
452 + 464 + 455
3
1371
=
3
= 457
7
457
= 1.53%
MOCP*
100
110
100
110
110
125
80
90
80
100
90
100
100
110
110
125
110
125
80
90
90
100
90
110