Carrier R080-528 Installation Instructions Manual page 64

Table 7E — Electrical Data High Ambient 125 F Data, Duplex Units (High-Static Condenser Fan) (cont)
UNIT VOLTAGE
UNIT
Supplied
V-Hz
30GXN,R
(3 Ph)
Min
208/230-60 187
230-60 207
418A,
460-60 414
528A,B
575-60 518
380-60 342
208/230-60 187
230-60 207
453A/B,
460-60 414
478B
575-60 518
380-60 342
208/230-60 187
230-60 207
475A,
460-60 414
500A/B
575-60 518
380-60 342
LEGEND
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
— Across-the-Line Start
XL
*Amperages in ( ) are for units with cooler heaters installed.
†Wye-delta start is standard. Across-the-line start is not available.
**Circuit A/Circuit B.
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
max voltage deviation from average voltage
= 100 x
average voltage
Example: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
Average voltage =
=
POWER
SUPPLY
# Power Supply
QTY. REQD
Conductors
Max
253 2 12
253 2 12
506 1 6
633 1 6
418 1 6
253 2 12
253 2 12
506 1 6
633 1 3
418 1 6
253 2 12
253 2 12
506 1 6
633 1 6
418 1 6
243 + 236 + 238
3
239 v
HIGH-STATIC CONDENSER FAN
ICF
MCA MOCP
XL
752/652** 1000/800** † 1077.4/976.6**
681/612** 800/800** † 1045.6/976.6**
593 700 1578.4
477 500 1265.3
713 800 1783.5
693/488** 1000/700** † 1017.9/722.4**
627/461** 800/600** † 991.8/722.4**
504 600 1490.2
406 500 1194.4
607 700 1677.3
753/518** 1000/700** † 1077.7/756.2**
681/486** 800/700** † 1045.6/756.2**
540 600 1526.3
433 500 1221.8
651 800 1721.2
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:
% Voltage Imbalance
This amount of phase imbalance is satisfactory as it is below the maximum allow-
able 2%.
IMPORTANT: Contact your local electric utility company immediately if the supply
voltage phase imbalance is more than 2%.
64
CONTROL CIRCUIT
Rec Fuse Size
V-Hz
(Single Ph)
WD XL WD
† 800/700** 115-60
† 700 115-60
774.4 700 700 115-60
622.3 600 600 115-60
894.5 800 800 230-60
† 800/600** 115-60
† 800/600** 115-60
686.2 600 600 115-60
551.4 450 450 115-60
788.3 700 700 230-60
† 1000/600** 115-60
† 800/600** 115-60
722.3 600 600 115-60
578.8 500 500 115-60
832.2 700 700 230-60
4
= 100 x
239
= 1.7%
MCA and
MOCP*
30 (50)
30 (50)
30 (50)
30 (50)
15 (25)
30 (50)
30 (50)
30 (50)
30 (50)
15 (25)
30 (50)
30 (50)
30 (50)
30 (50)
15 (25)