Carrier WEATHERMAKER 48AJ User Manual
Page 28
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Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)
LEGEND
*Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combination 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 voltage is
greater than 2%. Use the following formula to determine the percent of volt-
age 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
48A
VOLTAGE
3 PH, 60 Hz
VOLTAGE
RANGE
COMPRESSOR
CONDENSER
FAN MOTOR
EVAPORATOR
FAN MOTOR
POWER
EXHAUST
CONVENIENCE
OUTLET
POWER SUPPLY
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
Min Max RLA LRA RLA LRA RLA LRA RLA LRA
Qty
FLA
Hp
FLA
FLA (total)
FLA
MCA
Fuse or
HACR Brkr*
051
208
187 229
34.3
265
34.3
265
34.3
265
34.3
265
6
6.5
(ea)
20
59.4
—
7.0
257.5
300
35.4
7.0
292.9
350
25
74.8
—
7.0
276.7
350
35.4
7.0
312.1
350
30
88
—
7.0
293.2
350
35.4
7.0
328.6
400
40
114
—
7.0
325.7
400
35.4
7.0
361.1
450
230
207 253
34.3
265
34.3
265
34.3
265
34.3
265
6
6.6
(ea)
20
54
—
7.0
251.3
300
35.4
7.0
286.7
300
25
68
—
7.0
268.8
300
35.4
7.0
304.2
350
30
80
—
7.0
283.8
350
35.4
7.0
319.2
350
40
104
—
7.0
313.8
400
35.4
7.0
349.2
450
460
414 508
16
120
16
120
16
120
16
120
6
3.3
(ea)
20
27
—
3.5
121.1
125
18.9
3.5
140.0
150
25
34
—
3.5
129.8
150
18.9
3.5
148.7
175
30
40
—
3.5
137.3
175
18.9
3.5
156.2
175
40
52
—
3.5
152.3
200
18.9
3.5
171.2
200
575
518 632
12.9
80
12.9
80
12.9
80
12.9
80
6
2.6
(ea)
20
22
—
2.5
97.2
110
14.4
2.5
111.6
125
25
27
—
2.5
103.5
125
14.4
2.5
117.9
125
30
32
—
2.5
109.7
125
14.4
2.5
124.1
150
40
41
—
2.5
121.0
150
14.4
2.5
135.4
175
060
208
187 229
40.8
265
47
380
40.8
265
47
380
6
6.5
(ea)
25
75.0
—
7.0
315.1
350
35.4
7.0
350.5
400
30
88.0
—
7.0
331.6
400
35.4
7.0
367.0
450
40
114.0
—
7.0
364.1
450
35.4
7.0
399.5
500
230
207 253
40.8
265
47
380
40.8
265
47
380
6
6.6
(ea)
25
68.0
—
7.0
307.2
350
35.4
7.0
342.6
400
30
80.0
—
7.0
322.2
400
35.4
7.0
357.6
400
40
104.0
—
7.0
352.2
450
35.4
7.0
387.6
450
460
414 508
20.2
135
22.4
175
20.2
135
22.4
175
6
3.3
(ea)
25
34.0
—
3.5
151.0
175
18.9
3.5
169.9
200
30
40.0
—
3.5
158.5
175
18.9
3.5
177.4
200
40
52.0
—
3.5
173.5
225
18.9
3.5
192.4
225
575
518 632
16.6
120
18.6
140
16.6
120
18.6
140
6
2.6
(ea)
25
27.0
—
2.5
122.3
125
14.4
2.5
136.7
150
30
32.0
—
2.5
128.5
150
14.4
2.5
142.9
150
40
41.0
—
2.5
139.8
175
14.4
2.5
154.2
175
FLA
— Full Load Amps
HACR
— Heating, Air Conditioning and Refrigeration
LRA
— Locked Rotor Amps
MCA
— Minimum Circuit Amps
NEC
— National Electrical Code
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