Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING EY024-048 User Manual
Page 19
Table 4 — Electrical Data (cont)
UNIT
SIZE
48E
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
POWER
EXHAUST
COMBUSTION
FAN MOTOR
POWER SUPPLY
No. 1
No. 2
Min
Max
RLA LRA RLA
LRA
Qty Hp
FLA
(ea)
Hp
FLA
FLA LRA
FLA
MCA
MOCP*
034
208/230
187
254
57.1
266
57.1
266
2
1
5.3
10
30.8/
28.0
—
—
0.96
169.9/167.1 225/200
23.6
41.6
0.96
193.5/190.7 250/225
15
46.2/
42.0
—
—
0.96
185.3/181.1 225/225
23.6
41.6
0.96
208.9/204.7 250/250
20
59.4/
54.0
—
—
0.96
198.5/193.1 250/250
23.6
41.6
0.96
222.1/216.7 275/250
460
414
508
25.6
120
25.6
120
2
1
2.7
10
14.0
—
—
0.50
77.0
100
12.6
23.6
0.50
89.6
110
15
21.0
—
—
0.50
84.0
100
12.6
23.6
0.50
96.6
110
20
27.0
—
—
0.50
90.0
110
12.6
23.6
0.50
102.6
125
575
518
632
20.5
96
20.5
96
2
1
2.4
10
11.0
—
—
0.50
61.9
80
12.6
23.6
0.50
74.5
90
15
17.0
—
—
0.50
67.9
80
12.6
23.6
0.50
80.5
100
20
22.0
—
—
0.50
72.9
90
12.6
23.6
0.50
85.5
100
038
208/230
187
254
57.1
266
57.1
266
4
1
5.3
10
30.8/
28.0
—
—
0.96
180.5/177.7 225/225
23.6
41.6
0.96
204.1/201.3 250/250
15
46.2/
42.0
—
—
0.96
195.9/191.7 250/225
23.6
41.6
0.96
219.5/215.3 275/250
20
59.4/
54.0
—
—
0.96
209.1/203.7 250/250
23.6
41.6
0.96
232.7/227.3 275/275
460
414
508
25.6
120
25.6
120
4
1
2.7
10
14.0
—
—
0.50
82.4
100
12.6
23.6
0.50
95.0
110
15
21.0
—
—
0.50
89.4
110
12.6
23.6
0.50
102.0
125
20
27.0
—
—
0.50
95.4
110
12.6
23.6
0.50
108.0
125
575
518
632
20.5
96
20.5
96
4
1
2.4
10
11.0
—
—
0.50
66.7
80
12.6
23.6
0.50
79.3
90
15
17.0
—
—
0.50
72.7
90
12.6
23.6
0.50
85.3
100
20
22.0
—
—
0.50
77.7
90
12.6
23.6
0.50
90.3
110
LEGEND
or
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
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
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.
7
% Voltage Imbalance = 100 x
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.
19