Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING EY024-048 User Manual
Page 20
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*
044
208/230
187
254
69.2
345
69.2
345
4
1
5.3
15
46.2/
42.0
—
—
0.96
223.1/218.9 275/275
23.6
41.6
0.96
246.7/242.5 300/300
20
59.4/
54.0
—
—
0.96
236.3/230.9 300/300
23.6
41.6
0.96
259.9/254.5 300/300
25
74.8/
68.0
—
—
0.96
251.7/244.9 300/300
23.6
41.6
0.96
275.3/268.5 300/300
460
414
508
28.8
173
28.8
173
4
1
2.7
15
21.0
—
—
0.50
96.6
125
12.6
23.6
0.50
109.2
125
20
27.0
—
—
0.50
102.6
125
12.6
23.6
0.50
115.2
125
25
34.0
—
—
0.50
109.6
125
12.6
23.6
0.50
122.2
150
575
518
632
26.7
120
26.7
120
4
1
2.4
15
17.0
—
—
0.50
86.7
110
12.6
23.6
0.50
99.3
125
20
22.0
—
—
0.50
91.7
110
12.6
23.6
0.50
104.3
125
25
27.0
—
—
0.50
96.7
110
12.6
23.6
0.50
109.3
125
048
208/230
187
254
82.1
446
69.2
345
4
1
5.3
20
59.4/
54.0
—
—
0.96
252.4/247.0 300/300
23.6
41.6
0.96
276.0/270.6 300/300
25
74.8/
68.0
—
—
0.96
267.8/261.0 300/300
23.6
41.6
0.96
291.4/284.6 300/300
30
88.0/
80.0
—
—
0.96
281.0/273.0 300/300
23.6
41.6
0.96
304.6/296.6 350/300
460
414
508
42.3
223
28.8
173
4
1
2.7
20
27.0
—
—
0.50
119.5
150
12.6
23.6
0.50
132.1
150
25
34.0
—
—
0.50
126.5
150
12.6
23.6
0.50
139.1
175
30
40.0
—
—
0.50
132.5
150
12.6
23.6
0.50
145.1
175
575
518
632
34.6
164
26.7
120
4
1
2.4
20
22.0
—
—
0.50
101.6
125
12.6
23.6
0.50
114.2
125
25
27.0
—
—
0.50
106.6
125
12.6
23.6
0.50
119.2
150
30
32.0
—
—
0.50
111.6
125
12.6
23.6
0.50
124.2
150
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.
20