Carrier WEATHERMAKER 48AJ - Manual (Page 24)

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Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without 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 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 max-
imum allowable 2%.
UNIT
SIZE
48A
VOLTAGE
3 PH, 60 Hz
VOLTAGE
RANGE
COMPRESSOR CONDENSER
FAN MOTOR
EVAPORATOR
FAN MOTOR
POWER
EXHAUST
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) MCA MOCP*
051
208 187 229 34.3 265 34.3 265 34.3 265 34.3 265 6
6.5
(ea)
20 59.4
— 250.5 300
35.4 285.9 300
25 74.8
— 269.7 300
35.4 305.1 350
30 88
— 286.2 350
35.4 321.6 400
40 114
— 318.7 400
35.4 354.1 450
230 207 253 34.3 265 34.3 265 34.3 265 34.3 265 6
6.6
(ea)
20 54
— 244.3 250
35.4 279.7 300
25 68
— 261.8 300
35.4 297.2 350
30 80
— 276.8 350
35.4 312.2 350
40 104
— 306.8 400
35.4 342.2 400
460 414 508 16 120 16 120 16 120 16 120 6
3.3
(ea)
20 27
— 117.6 125
18.9 136.5 150
25 34
— 126.3 150
18.9 145.2 175
30 40
— 133.8 150
18.9 152.7 175
40 52
— 148.8 200
18.9 167.7 200
575 518 632 12.9 80 12.9 80 12.9 80 12.9 80 6
2.6
(ea)
20 22
— 94.7 110
14.4 109.1 125
25 27
— 101.0 125
14.4 115.4 125
30 32
— 107.2 125
14.4 121.6 150
40 41
— 118.5 150
14.4 132.9 150
060
208 187 229 40.8 265 47 380 40.8 265 47 380 6
6.5
(ea)
25 75.0
— 308.1 350
35.4 343.5 400
30 88.0
— 324.6 400
35.4 360.0 400
40 114.0
— 357.1 450
35.4 392.5 450
230 207 253 40.8 265 47 380 40.8 265 47 380 6
6.6
(ea)
25 68.0
— 300.2 350
35.4 335.6 350
30 80.0
— 315.2 350
35.4 350.6 400
40 104.0
— 345.2 400
35.4 380.6 450
460 414 508 20.2 135 22.4 175 20.2 135 22.4 175 6
3.3
(ea)
25 34.0
— 147.5 175
18.9 166.4 175
30 40.0
— 155.0 175
18.9 173.9 200
40 52.0
— 170.0 200
18.9 188.9 225
575 518 632 16.6 120 18.6 140 16.6 120 18.6 140 6
2.6
(ea)
25 27.0
— 119.8 125
18.9 138.7 150
30 32.0
— 126.0 150
18.9 144.9 175
40 41.0
— 137.3 175
18.9 156.2 175
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
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