Carrier 30HXA,HXC076-186 Water-Cooled and Condenserless Chillers User Manual
Page 18
Table 4B — Unit Electrical Data, 30HXA Units* (cont)
UNIT
30HXA
VOLTAGE
POWER CIRCUIT
CONTROL CIRCUIT
ICF
Nameplate
(3 Ph)
Supplied
Min
Max
MCA
MOCP
Recommended
Fuse Size
Voltage
(Single
Ph)
Min
Max
MCA
MOCP
WD
XL
161
208/230-60
187
253
437/295
700/500
600/400
115-60
104
127
15
15
979
†
460-60
414
506
304
450
350
115-60
104
127
478
1282
575-60
518
633
243
350
300
115-60
104
127
382
1025
380-60
342
418
368
500
450
230-60
207
254
539
1428
230-50
207
253
415/275
700/450
500/350
230-50
198
254
858
†
346-50
325
380
276/183
450/300
350/225
230-50
198
254
535
†
380/415-50
342
440
385
500
450
230-50
198
254
533
1398
171
208/230-60
187
253
359/437
600/700
450/600
115-60
104
127
15
15
1030
†
460-60
414
506
327
450
400
115-60
104
127
501
1305
575-60
518
633
261
350
300
115-60
104
127
401
1044
380-60
342
418
396
500
450
230-60
207
254
567
1456
230-50
207
253
334/415
600/700
450/500
230-50
198
254
905
†
346-50
325
380
222/276
350/450
300/350
230-50
198
254
616
†
380/415-50
342
440
413
600
500
230-50
198
254
562
1427
186
208/230-60
187
253
437/437
700/700
600/600
115-60
104
127
15
15
1093
†
460-60
414
506
355
500
400
115-60
104
127
529
1333
575-60
518
633
284
400
350
115-60
104
127
539
1066
380-60
342
418
239/239
400/400
300/300
230-60
207
254
601
1490
230-50
207
253
415/415
700/700
500/500
230-50
198
254
970
†
346-50
325
380
276/276
450/450
350/350
230-50
198
254
660
†
380/415-50
342
440
453
600
600
230-50
198
254
601
1466
LEGEND
ICF
— Maximum Instantaneous Current Flow during start-up
(the point in the starting sequence where the sum of the
LRA for the start-up compressor, plus the total RLA for
all running compressors, plus the total FLA for all run-
ning fan motors is at a maximum)
MCA
— Minimum Circuit Ampacity (for wire sizing)
MOCP — Maximum Overcurrent Protection
RLA
— Rated Load Amps
WD
— Wye-Delta Start
XL
— Across-the-Line Start
*Refer to Carrier’s electronic catalog for the most current electrical
data.
†Wye-Delta Start is standard. Not available in across-the-line start.
**The 30HX186 units have 2 terminal blocks/non-fused disconnects
and 6 parallel conductors/non-fused disconnects.
††The 30HXA136-186 units have 2 terminal blocks/non-fused
disconnects and 6 parallel conductors/non-fused disconnects.
NOTES:
1. Main power must be supplied from a field-supplied fused electri-
cal service with a (factory- or field-installed) disconnect located in
sight from the unit.
2. Control circuit power must be supplied from a separate source through
a field-supplied disconnect. The control circuit accessory trans-
former 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 phase imbalance is: voltage, 2%; amps, 5%.
5. Units with one MCA value have one main terminal block. Units
with 2 MCA values require multiple conductors.
6. Use copper conductors only.
7. The MOCP is calculated as follows:
MOCP = (2.25) (largest RLA) + the sum of the other RLAs. Size
the fuse one size down from the result. The RLAs are listed on the
unit nameplate.
The recommended fuse size in amps (RFA) is calculated as
follows:
RFA = (1.50) (largest RLA) + the sum of the other RLAs. Size
the fuse one size up from the result. The RLAs are listed on the
unit nameplate.
8. Units have the following power wiring terminal blocks and parallel
conductors:
VOLTAGE
TERMINAL
BLOCKS
OR NON-FUSED
DISCONNECTS
PARALLEL
CONDUCTORS
OR NON-FUSED
DISCONNECTS
208/230
2
6
460
1
3
575
1
3
380**
1
3
230
2
6
346††
1
3
380/415
1
3
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