55
Table 7A — Electrical Data Reduced Ambient 115 F Data (cont)
LEGEND
*Wye-delta start is standard. Across-the-line start is not available.
NOTES:
1. Main power must be supplied from a field-supplied fused electrical service with a
(factory or field-installed) disconnect located in sight from the unit.
2. Cooler heater, oil heater, and control circuit power must be supplied from a separate
source through a field-supplied disconnect. The control circuit power transformer acces-
sory may be applied to power from the main unit power supply.
3. Maximum incoming wire size for each terminal block is 500 kcmil.
4. Maximum allowable supply voltage phase imbalance is voltage 2%.
5. 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.
Percent Voltage Imbalance
Example: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
Determine maximum deviation from average voltage:
(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v
Maximum deviation is 4 v. Determine percent voltage imbalance:
This amount of phase imbalance is satisfactory as it is below the maximum allow-
able 2%.
UNIT
30GXN,R
UNIT VOLTAGE
POWER
SUPPLY
QTY. REQD
STANDARD CONDENSER FAN CONTROL CIRCUIT
V-H z
(3 Ph)
Supplied
# Power Supply
Conductors
MCA MOCP
ICF Rec Fuse Size
V-Hz
(Single Ph)
MCA and
MOCP
Min Max XL WD XL WD
128
208/230-60 187 253 1 6 527.7 700 * 808.5 * 600 115-60 30
230-60 207 253 1 6 483.3 700 * 792.6 * 600 115-60 30
460-60 414 506 1 3 238.8 300 1022.9 393.9 300 300 115-60 30
575-60 518 633 1 3 191.0 250 818.3 315.3 225 225 115-60 30
380-60 342 418 1 3 288.9 400 1141.5 445.5 350 350 230-60 15
138,
283B, 303B,
373B
208/230-60 187 253 1 6 567.3 800 * 848.0 * 700 115-60 30
230-60 207 253 1 6 519.1 700 * 828.4 * 600 115-60 30
460-60 414 506 1 3 256.7 350 1040.8 411.8 300 300 115-60 30
575-60 518 633 1 3 205.3 250 832.6 329.6 250 250 115-60 30
380-60 342 418 1 3 310.6 400 1163.2 467.2 350 350 230-60 15
153,
283A, 328B,
393B, 418B
208/230-60 187 253 2 9 453.7/259 700/450 * 818.2/518.0 * 600/350 115-60 30
230-60 207 253 1 6 604.9 800 * 1005.4 * 700 115-60 30
460-60 414 506 1 3 298.9 400 1302.6 498.6 350 350 115-60 30
575-60 518 633 1 3 239.1 300 1042.1 399.1 300 300 115-60 30
380-60 342 418 1 3 361.6 500 1453.4 564.4 450 450 230-60 15
163,
303A
208/230-60 187 253 2 9 468.7/300 700/500 * 833.2/581.0 * 600/400 115-60 30
230-60 207 253 2 9 432.7/272 700/450 * 833.2/581.0 * 600/350 115-60 30
460-60 414 506 1 3 320.8 450 1324.5 520.5 400 400 115-60 30
575-60 518 633 1 3 256.6 350 1059.6 416.6 300 300 115-60 30
380-60 342 418 1 6 388.1 500 1479.9 590.9 450 450 230-60 15
178,
328A, 353A/B,
208/230-60 187 253 2 9 468.7/378 700/600 * 833.2/743.0 * 600/500 115-60 30
230-60 207 253 2 9 432.7/343 700/600 * 833.2/743.0 * 600/450 115-60 30
460-60 414 506 1 3 349.1 450 1352.8 548.8 400 400 115-60 30
575-60 518 633 1 3 279.2 350 1082.2 439.2 350 350 115-60 30
380-60 342 418 1 6 422.4 500 1514.2 625.2 500 500 230-60 15
208
208/230-60 187 253 2 9 541/350 700/500 * 821.2/609.0 * 700/450 115-60 30 (50)
230-60 207 253 2 9 489/325 700/500 * 798.4/609.0 * 600/400 115-60 30 (50)
460-60 414 506 1 6 383 450 1167.1 538.1 450 450 115-60 30 (50)
575-60 518 633 1 3 306 350 932.8 429.8 350 350 115-60 30 (50)
380-60 342 418 1 6 467 500 1319.4 623.4 500 500 230-60 15 (25)
228,
453A/B, 478B
208/230-60 187 253 2 9 619/350 800/500 * 983.2/609.0 * 700/450 115-60 30 (50)
230-60 207 253 2 9 560/325 800/500 * 960.4/609.0 * 700/400 115-60 30 (50)
460-60 414 506 1 6 418 500 1422.1 618.1 500 500 115-60 30 (50)
575-60 518 633 1 3 334 400 1136.8 493.8 400 400 115-60 30 (50)
380-60 342 418 1 6 510 600 1601.4 712.4 600 600 230-60 15 (25)
253,
373A, 393A,
478A, 503A/B
208/230-60 187 253 2 12 681/404 800/600 * 1045.8/685.0 * 800/500 115-60 30 (50)
230-60 207 253 2 9 617/350 800/500 * 1017.0/659.0 * 700/450 115-60 30 (50)
460-60 414 506 1 6 468 600 1471.9 667.9 600 600 115-60 30 (50)
575-60 518 633 1 3 374 450 1176.6 533.6 450 450 115-60 30 (50)
380-60 342 418 1 6 570 700 1662.1 773.1 700 700 230-60 15 (25)
268,
418A, 528A/B
208/230-60 187 253 2 12 681/482 800/700 * 1045.8/847.0 * 800/600 115-60 30 (50)
230-60 207 253 2 12 617/447 800/700 * 1017.0/847.0 * 700/600 115-60 30 (50)
460-60 414 506 1 6 496 600 1500.2 696.2 600 600 115-60 30 (50)
575-60 518 633 1 6 396 500 1199.2 556.2 450 450 115-60 30 (50)
380-60 342 418 1 6 605 700 1696.4 807.4 700 700 230-60 15 (25)
ICF —
Maximum Instantaneous Current Flow
MCA —
Minimum Circuit Ampacity (for wire sizing)
MOCP —
Maximum Overcurrent Protection
Rec Fuse Size —
Recommended Dual-Element Fuse Amps (150% of largest
compressor rated load amps [RLA] plus 100% of remaining
compressor RLAs and sum of condenser fan full load amps
[FLAs]. Choose next largest standard fuse size.)
WD —
Wye-Delta Start
XL —
Across-the-Line Start
= 100 x
max voltage deviation from average voltage
average voltage
Average voltage =
243 + 236 + 238
3
= 239 v
% Voltage Imbalance = 100 x
4
239
= 1.7%
IMPORTANT: Contact your local electric utility company immediately if the supply
voltage phase imbalance is more than 2%.
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