Carrier 48AJ User Manual
Page 42
42
Table 8 — Electrical Data — 48EJ,EK,EW,EY Units (cont)
LEGEND
*Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combi-
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percent of voltage imbalance.
% Voltage imbalance
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
UNIT
SIZE
48EJ,EK,
EW,EY
NOMNAL
VOLTAGE
(3 Ph,
60 Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
POWER
EXHAUST
COMBUSTION
FAN MOTOR
POWER SUPPLY
No. 1
No. 2
Min Max
RLA
LRA
RLA
LRA Qty Hp
FLA
(ea)
Hp
FLA
FLA LRA
FLA
MCA
MOCP*
064
208/230
187
254
106.4
506
82.1
446
6
1
5.3
25
74.6/
68.0
—
—
1.44
321.5/314.9 400/400
35.4 62.4
1.44
356.9/350.3 450/450
30
88.0/
80.0
—
—
1.44
334.9/326.9 400/400
35.4 62.4
1.44
370.3/362.3 450/450
40
114.0/
104.0
—
—
1.44
360.9/350.9 450/450
35.4 62.4
1.44
396.3/386.3 500/450
460
414
508
52.6
253
43.6
223
6
1
2.7
25
34.0
—
—
0.75
159.5
200
18.9 35.4
0.75
178.4
225
30
40.0
—
—
0.75
165.5
200
18.9 35.4
0.75
184.4
225
40
52.0
—
—
0.75
177.5
225
18.9 35.4
0.75
196.4
225
575
518
632
40.4
176
34.6
164
6
1
2.4
25
27.0
—
—
0.75
126.5
150
18.9 35.4
0.75
145.4
175
30
32.0
—
—
0.75
131.5
150
18.9 35.4
0.75
150.4
175
40
41.0
—
—
0.75
140.5
175
18.9 35.4
0.75
159.4
175
068
208/230
187
254
106.4
506
106.4
506
6
1
5.3
25
74.6/
68.0
—
—
1.44
345.8/339.2 450/400
35.4 62.4
1.44
381.2/374.6 450/450
30
88.0/
80.0
—
—
1.44
359.2/351.2 450/450
35.4 62.4
1.44
394.6/386.6 500/450
40
114.0/
104.0
—
—
1.44
385.2/375.2 450/450
35.4 62.4
1.44
420.6/410.6 500/500
460
414
508
52.6
253
52.6
253
6
1
2.7
25
34.0
—
—
0.75
168.5
200
18.9 35.4
0.75
187.4
225
30
40.0
—
—
0.75
174.5
225
18.9 35.4
0.75
193.4
225
40
52.0
—
—
0.75
186.5
225
18.9 35.4
0.75
205.4
250
575
518
632
40.4
176
40.4
176
6
1
2.4
25
27
—
—
0.75
132.3
150
18.9 35.4
0.75
151.2
175
30
32
—
—
0.75
137.3
175
18.9 35.4
0.75
156.2
175
40
41
—
—
0.75
146.3
175
18.9 35.4
0.75
165.2
200
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM
— Indoor (Evaporator) Fan Motor
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP— Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA
— Rated Load Amps
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
7
457
or