Carrier 48AJ User Manual
Page 38
38
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*
050
208/230
187
253
69.2
345
69.2
345
4
5.3
(ea)
20
59.4/54.0
—
236.3/230.9
300/300
23.6/23.6
259.9/254.5
300/300
25
74.8/68.0
—
253.1/244.9
300/300
23.6/23.6
276.7/268.5
350/300
30
88/80.0
—
269.6/259.6
350/300
23.6/23.6
293.2/283.2
350/350
460
414
508
28.8
173
28.8
173
4
2.7
(ea)
20
27
—
102.6
125
12.6
115.2
125
25
34
—
110.9
125
12.6
123.5
150
30
40
—
118.4
150
12.6
131.0
150
575
518
632
26.7
120
26.7
120
4
2.4
(ea)
20
22
—
91.7
110
12.6
104.3
125
25
27
—
96.8
110
12.6
109.4
125
30
32
—
103.0
125
12.6
115.6
125
060
208/230
187
253
82.1
446
82.1
446
6
5.3
(ea)
25
74.8/68.0
—
291.3/284.5
350/350
35.4/35.4
326.7/319.9
400/400
30
88/80.0
—
306.0/296.5
350/350
35.4/35.4
341.4/331.9
400/400
40
114/104
—
338.5/326.0
450/400
35.4/35.4
373.9/361.4
450/450
460
414
508
43.6
223
43.6
223
6
2.7
(ea)
25
34
—
148.3
175
18.9
167.2
200
30
40
—
154.3
175
18.9
173.2
200
40
52
—
168.4
200
18.9
187.3
225
575
518
632
34.6
164
34.6
164
6
2.4
(ea)
25
27
—
119.3
150
18.9
138.2
150
30
32
—
124.3
150
18.9
143.2
175
40
41
—
134.9
175
18.9
153.8
175
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