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Table 2 — Electrical Data
LEGEND
*Fuse or HACR circuit breaker.
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. 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 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 voltage imbalance.
= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
IMPORTANT:
If the supply voltage phase imbalance is more than 2%, contact your local electric
utility company immediately.
UNIT
581A
NOMINAL
VOLTAGE
(3 Ph, 60
Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM IFM
POWER
EXHAUST
COMBUSTION
FAN MOTOR
POWER
SUPPLY
No. 1 No. 2
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP*
015
(Standard
IFM)
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 2.9
8.8/
8.4
—
4.6
—
18.8
0.57
0.57
59/59
64/63
70/70
80/80
460 414 508 10 70 10 62 3 0.5 0.8 2.9 4.2
—
2.3
—
6.0
0.30
0.30
29
31
35
40
015
(Optional
IFM)
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 3.7
11.0/
10.5
—
4.6
—
18.8
0.57
0.57
61/61
66/65
80/80
80/80
460 414 508 10 70 10 62 3 0.5 0.8 3.7 4.8
—
2.3
—
6.0
0.30
0.30
30
32
35
40
017
208/230 187 253 32.1 195 20.7 156 3 0.5 1.7 5.0
15.8/
15.8
—
4.6
—
18.8
0.57
0.57
82/82
86/86
110/110
110/110
460 414 508 16.4 95 10 70 3 0.5 0.8 5.0 7.9
—
2.3
—
6.0
0.30
0.30
41
43
50
50
025
208/230 187 253 42 239 33.6 225 2 1 6.6 7.5
25.0/
25.0
—
4.6
—
18.8
0.57
0.57
124/124
129/129
150/150
150/150
460 414 508 19.2 125 17.3 114 2 1 3.3 7.5 13.0
—
2.3
—
6.0
0.30
0.30
61
63
80
80
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
% Voltage Imbalance = 100 x
7
457