Carrier 30HXA,HXC076-186 Water-Cooled and Condenserless Chillers User Manual
Page 16
Table 4A — Unit Electrical Data, 30HXC Units* (cont)
UNIT
30HXC
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
285/197
500/350
350/250
115-60
104
127
15
15
591
†
460-60
414
506
200
300
250
115-60
104
127
287
756
575-60
518
633
160
225
200
115-60
104
127
230
605
380-60
342
418
242
350
300
230-60
207
254
325
843
230-50
207
253
266/182
450/300
350/225
230-50
198
254
578
†
346-50
325
380
273
400
350
230-50
198
254
394
†
380/415-50
342
440
249
350
300
230-50
198
254
358
944
171
208/230-60
187
253
238/285
400/500
300/400
115-60
104
127
15
15
624
†
460-60
414
506
215
300
250
115-60
104
127
302
771
575-60
518
633
172
250
200
115-60
104
127
242
617
380-60
342
418
260
350
300
230-60
207
254
343
861
230-50
207
253
219/266
350/450
300/350
230-50
198
254
607
†
346-50
325
380
145/176
250/300
175/225
230-50
198
254
413
†
380/415-50
342
440
267
350
300
230-50
198
254
376
962
186
208/230-60
187
253
285/285
500/500
400/400
115-60
104
127
15
15
661
†
460-60
414
506
232
300
300
115-60
104
127
319
788
575-60
518
633
185
250
225
115-60
104
127
255
630
380-60
342
418
156/156
250/250
200/200
230-60
207
254
364
882
230-50
207
253
266/266
450/450
350/350
230-50
198
254
645
†
346-50
325
380
176/176
300/300
225/225
230-50
198
254
438
†
380/415-50
342
440
289
400
350
230-50
198
254
399
985
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 30HXC171 and 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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