—12—
Table 5 — Electrical Data
LEGEND
*Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion load equipment (refer to NEC Articles 430 and 440), the overcur-
rent 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
of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
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.
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 the local electric utility company immediately.
UNIT
579F
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*
180
(15 Tons)
208/230 187 253 25.6 190 25.6 190 3 0.5 1.7 3.7 10.5/11.0
— — 0.57 74/74 90/ 90
4.6 18.8 0.57 78/79 100/100
460 414 508 13.5 95 13.5 95 3 0.5 0.8 3.7 4.8
— — 0.30 38 50
2.3 6.0 0.30 40 50
216
(18 Tons)
208/230 187 253 33 237 23 184 3 0.5 1.7 5.0 15.8/15.8
— — 0.57 85/85 110/110
4.6 18.8 0.57 90/90 110/110
460 414 508 16.2 130 10.2 90 3 0.5 0.8 5.0 7.9
— — 0.30 41 50
2.3 6.0 0.30 43 50
240
(20 Tons)
208/230 187 253 33 237 29.5 237 2 1 6.6 7.5 25.0/25.0
— — 0.57 109/109 125/125
4.6 18.8 0.57 114/114 125/125
460 414 508 16.2 130 14.1 130 2 1 3.3 7.5 13.0
— — 0.30 54 70
2.3 6.0 0.30 56 70
300
(25 Tons)
208/230 187 253 47.5 265 33.0 237 2 1 6.6 10.0 28.0/28.0
— — 0.57 134/134 175/175
4.6 18.8 0.57 135/135 175/175
460 414 508 22.9 145 16.2 130 2 1 3.3 10.0 14.6
— — 0.30 66 80
2.3 6.0 0.30 68 90
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, U.S.A.
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
=
457
% Voltage Imbalance = 100 x
7
457
= 1.53%
To Next Page
Loading...
