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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