Carrier 48AJ User Manual
Page 36
36
Table 7 — Electrical Data — 48AJ,AK,AW,AY Units (cont)
LEGEND
*Fuse or HACR circuit breaker per NEC.
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. The 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 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%.
UNIT SIZE
48AJ,AK,
AW,AY
NOMINAL
VOLTAGE
(3 PH, 60 Hz)
VOLTAGE RANGE
COMPRESSOR
OFM
IFM
POWER
EXHAUST
POWER
SUPPLY
No. 1
No. 2
Min
Max
RLA LRA RLA LRA Qty FLA Hp
FLA
FLA
(total)
MCA
MOCP*
027
208/230
187
253
39.1
256
39.1
256
2
5.3
(ea)
10
30.8/28.0
—
129.4/126.6
150/150
23.6/23.6
153.0/150.2
175/175
15
46.2/42.0
—
146.6/141.3
175/175
23.6/23.6
170.2/164.9
200/200
20
59.4/54.0
—
163.1/156.3
200/200
23.6/23.6
186.7/179.9
225/225
460
414
508
19.9
114
19.9
114
2
2.7
(ea)
10
14
—
64.2
80
12.6
76.8
90
15
21
—
71.5
90
12.6
84.1
100
20
27
—
79.0
100
12.6
91.6
110
575
518
632
16
91
16
91
2
2.4
(ea)
10
11
—
51.8
60
12.6
64.4
80
15
17
—
58.1
70
12.6
70.7
80
20
22
—
64.3
80
12.6
76.9
90
030
208/230
187
253
57.1
266
39.1
228
2
5.3
(ea)
10
30.8/28.0
—
151.9/149.1
200/200
23.6/23.6
175.5/172.7
225/225
15
46.2/42.0
—
167.3/163.1
200/200
23.6/23.6
190.9/186.7
225/225
20
59.4/54.0
—
181.1/175.1
225/225
23.6/23.6
204.7/198.7
250/250
460
414
508
25.6
120
19.9
114
2
2.7
(ea)
10
14
—
71.3
90
12.6
83.9
100
15
21
—
78.3
100
12.6
90.9
110
20
27
—
84.7
110
12.6
97.3
110
575
518
632
20.5
96
16
91
2
2.4
(ea)
10
11
—
57.4
70
12.6
70.0
90
15
17
—
63.4
80
12.6
76.0
90
20
22
—
68.8
90
12.6
81.4
100
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
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
7
457