57
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
HIGH-STATIC CONDENSER FAN CONTROL CIRCUIT
V-Hz
(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 6 584.4 800 * 865.1 * 700 115-60 30
230-60 207 253 1 6 540.0 700 * 849.2 * 600 115-60 30
460-60 414 506 1 3 262.0 350 1046.1 417.1 300 300 115-60 30
575-60 518 633 1 3 210.9 250 838.2 335.2 250 250 115-60 30
380-60 342 418 1 3 315.2 400 1167.8 471.8 350 350 230-60 15
138,
283B, 303B,
373B
208/230-60 187 253 1 6 623.9 800 * 904.7 * 700 115-60 30
230-60 207 253 1 6 575.8 700 * 885.0 * 700 115-60 30
460-60 414 506 1 3 279.9 350 1064.0 435.0 350 350 115-60 30
575-60 518 633 1 3 225.2 300 852.5 349.5 250 250 115-60 30
380-60 342 418 1 3 336.9 450 1189.5 493.5 400 400 230-60 15
153,
283A, 328B,
393B, 418B
208/230-60 187 253 2 9 524.5/259 800/450 * 889.0/518.0 * 700/350 115-60 30
230-60 207 253 1 6 675.7 800 * 1076.2 * 800 115-60 30
460-60 414 506 1 3 327.9 450 1331.6 527.6 400 400 115-60 30
575-60 518 633 1 3 263.9 350 1066.9 423.9 300 300 115-60 30
380-60 342 418 1 6 394.5 500 1486.3 597.3 450 450 230-60 15
163,
303A
208/230-60 187 253 2 9 553.7/300 800/500 * 918.2/581.0 * 700/400 115-60 30
230-60 207 253 2 9 517.7/272 700/450 * 918.2/581.0 * 600/350 115-60 30
460-60 414 506 1 3 355.6 450 1359.3 555.3 400 400 115-60 30
575-60 518 633 1 3 286.4 350 1089.4 446.4 350 350 115-60 30
380-60 342 418 1 6 427.5 500 1519.3 630.3 500 500 230-60 15
178,
328A, 353A/B
208/230-60 187 253 2 9 553.7/378 800/600 * 918.2/743.0 * 700/500 115-60 30
230-60 207 253 2 9 517.7/343 700/600 * 918.2/743.0 * 600/450 115-60 30
460-60 414 506 1 6 383.9 500 1387.6 583.6 450 450 115-60 30
575-60 518 633 1 3 309.0 400 1112.0 469.0 350 350 115-60 30
380-60 342 418 1 6 461.8 600 1553.6 664.6 600 600 230-60 15
208
208/230-60 187 253 2 12 541/463 700/600 * 821.2/722.4 * 700/600 115-60 30 (50)
230-60 207 253 2 12 489/443 700/600 * 798.4/705.2 * 600/500 115-60 30 (50)
460-60 414 506 1 6 426 500 1210.5 581.5 500 500 115-60 30 (50)
575-60 518 633 1 3 343 400 970.6 467.6 400 400 115-60 30 (50)
380-60 342 418 1 6 513 600 1365.4 669.4 600 600 230-60 15 (25)
228,
453A/B, 478B
208/230-60 187 253 2 12 619/463 800/600 * 983.2/722.4 * 700/600 115-60 30 (50)
230-60 207 253 2 12 560/443 800/600 * 960.4/705.2 * 700/500 115-60 30 (50)
460-60 414 506 1 6 462 500 1465.5 661.5 500 500 115-60 30 (50)
575-60 518 633 1 3 372 450 1174.6 531.6 400 400 115-60 30 (50)
380-60 342 418 1 6 556 700 1647.4 758.4 600 600 230-60 15 (25)
253,
373A, 393A,
478A, 503A/B
208/230-60 187 253 2 12 681/534 800/700 * 1045.8/814.6 * 800/600 115-60 30 (50)
230-60 207 253 2 12 617/509 800/700 * 1017.0/798.4 * 700/600 115-60 30 (50)
460-60 414 506 1 6 518 600 1521.5 717.5 600 600 115-60 30 (50)
575-60 518 633 1 6 417 500 1219.8 576.8 450 450 115-60 30 (50)
380-60 342 418 1 6 623 700 1714.7 825.7 700 700 230-60 15 (25)
268,
418A, 528A/B
208/230-60 187 253 2 12 681/612 800/800 * 1045.8/976.6 * 800/700 115-60 30 (50)
230-60 207 253 2 12 617/576 800/800 * 1017.0/976.6 * 700/700 115-60 30 (50)
460-60 414 506 1 6 546 600 1549.8 745.8 600 600 115-60 30 (50)
575-60 518 633 1 6 439 500 1242.4 599.4 500 500 115-60 30 (50)
380-60 342 418 1 6 657 800 1748.9 859.9 700 700 230-60 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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