Carrier 38AKS028-044 - Manual (Page 6)

Power Supply — Electrical characteristics of available
power supply must agree with unit nameplate rating. Supply
voltage must be within limits shown in Table 3.
IMPORTANT: Operating unit on improper supply volt-
age, or with excessive phase imbalance, constitutes abuse
and may affect Carrier warranty. See Unbalanced 3-Phase
Supply Voltage, page 7.
Power Wiring — All power wiring must comply with
applicable local and national codes. Install field-supplied branch
circuit fused disconnect(s) per NEC (National Electrical Code,
U.S.A.) of a type that can be locked OFF or OPEN. Dis-
connect(s) must be within sight from and readily accessible
from unit in compliance with NEC Article 440-14.
GENERAL WIRING NOTES
1. A crankcase heater is wired in the control circuit so it is
always operable as long as power supply disconnect is
on, even if any safety device is open or unit stop-start
switch is off. It is protected by a 5-amp circuit breaker in
control power.
2. The power circuit field supply disconnect should never be
open except when unit is being serviced or is to be down
for a prolonged period. When operation is resumed, crank-
case heater should be energized for 24 hours before start-
up. If unit is to be shut down for a prolonged period, it
is recommended that the suction and discharge valves be
closed to prevent an excessive accumulation of refriger-
ant in the compressor oil.
3. Power entry is one end only.
4. Maximum field wire sizes allowed by lugs on terminal
block are:
UNIT
38AKS
V-Ph-Hz
WIRE
SIZE*
028 208/230-3-60
350 kcmil
034
208/230-3-60
230-3-50
044
208/230-3-60
230-3-50
LEGEND
AWG — American Wire Gage
kcmil — Thousand Circular Mils
*All other units use 2/0 AWG (67.4 mm
2 ).
5. Terminals for field power supply are suitable for copper,
copper-clad aluminum, or aluminum conductors. Insula-
tion must be rated 167 F (75 C) minimum.
CONDENSER FANS — The fans must rotate counterclock-
wise when viewed from above. If necessary, correct direc-
tion of fan rotation by interchanging any 2 power input wires
at disconnect switch. Affix crankcase heater decal (located
in installer’s packet) to unit disconnect switch.
Table 3 — Electrical Data
60 HZ
UNIT
38AKS
UNIT COMPRESSOR FAN MOTORS
Volts
3 Ph, 60 Hz
Supplied*
MCA
MOCP
(Fuse)
ICF RLA LRA FLA (ea) Qty
Min. Max.
028
500
200
600
100 208/230
380
460
575
187
342
414
518 254
418
508
632 124.6
64.7
60.7
52.5
200
110
100
80
452.2
250.9
226.1
167.4 89.8
45.5
43.6
36.5 446
247
223
164 6.2
3.9
3.1
3.4 2
2
2
2
034
500
200
600
100 208/230
380
460
575
187
342
414
518 254
418
508
632 145.5
72.5
68.7
54.9
250
125
110
90
512.2
283.9
256.1
179.4 106.5
52.6
50.0
38.5
506
280
253
176 6.2
3.9
3.1
3.4 2
2
2
2
044
500
200
600
100 230
380
460
575 187
342
414
518 254
418
508
632 203.0
111.1
91.0
81.5
350
175
150
125 702.4
389.8
351.2
282.8 147.5
79.5
65.4
57.1
690
382
345
276 6.2
3.9
3.1
3.4 3
3
3
3
50 HZ
UNIT
38AKS
UNIT COMPRESSOR FAN MOTORS
Volts
3 Ph, 50 Hz
Supplied*
MCA
MOCP
(Fuse)
ICF RLA LRA FLA (ea) Qty
Min. Max.
028
800
300
900 230
346
400 198
311
342
254
380
400 109.0
64.9
60.5
175
100
100 348.4
263.4
226.0 76.9
44.9
43.6 342
259
223 6.4
4.4
3.0 2
2
2
034
800
300
900 230
346
400 198
311
342
254
380
400 120.2
76.1
68.5
200
125
110
372.4
298.4
256.0 85.9
53.9
50.0 366
294
253 6.4
4.4
3.0 2
2
2
044
800
300
900 230
346
400 198
311
342
254
380
400 150.6
112.6
90.8
250
175
150 557.8
408.8
351.0 105.1
79.5
65.4
545
400
345 6.4
4.4
3.0 3
3
3
LEGEND
CSA — Canadian Standards Association
FLA — Full Load Amps
ICF — Maximum Instantaneous Current Flow during starting (the point
in the starting sequence where the sum of the LRA for the start-
ing compressor, plus the total FLA for all running fan motors is
maximum).
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (complies with National
Electrical Code [NEC, U.S.A.], Section 430-24)
MOCP — Maximum Overcurrent Protection
RLA
— Rated Load Amps
UL — Underwriters’ Laboratories
*Units are suitable for use on electrical systems where voltage sup-
plied to unit terminals is not below or above listed minimum and maxi-
mum limits.
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