Carrier 48AK Installation, Start-Up And Service Instructions Manual page 37

VOLTAGE RANGE
UNIT SIZE NOMINAL
48AJ,AK, VOLTAGE
AW,AY (3 PH, 60 Hz)
208/230
035 460
575
208/230
040 460
575
LEGEND
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
*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
max voltage deviation from average voltage
= 100 x
average voltage
Table 7 — Electrical Data — 48AJ,AK,AW,AY Units (cont)
COMPRESSOR
No. 1
Min Max RLA LRA RLA LRA Qty FLA Hp
187 253 57.1 266 57.1 266
414 508 25.6 120 25.6 120
518 632 20.5 96
187 253 57.1 266 69.2 345
414 508 25.6 120 28.8 173
518 632 20.5 96
OFM IFM
No. 2
10 30.8/28.0
5.3
4 15 46.2/42.0
(ea)
20 59.4/54.0
10
2.7
4 15
(ea)
20
10
2.4
20.5 96 4 15
(ea)
20
15 46.2/42.0
5.3
4 20 59.4/54.0
(ea)
25 74.8/68.0
15
2.7
4 20
(ea)
25
15
2.4
26.7 120 4 20
(ea)
25
Example: Supply voltage is 460-3-60.
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
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
37
POWER
EXHAUST
FLA
FLA MCA
(total)
— 180.5/177.7
23.6/23.6 204.1/201.3
— 195.9/191.7
23.6/23.6 219.5/215.3
— 209.7/203.7
23.6/23.6 233.3/227.3
— 82.4
14
12.6 95.0
— 89.4
21
12.6 102.0
— 95.8
27
12.6 108.4
— 66.7
11
12.6 79.3
— 72.7
17
12.6 85.3
— 78.1
22
12.6 90.7
— 211.0/206.8
23.6/23.6 234.6/230.4
— 224.2/218.8
23.6/23.6 247.8/242.4
— 241.0/232.8
23.6/23.6 264.6/256.4
— 93.4
21
12.6 106.0
— 99.4
27
12.6 112.0
— 107.7
34
12.6 120.3
— 80.5
17
12.6 93.1
— 85.5
22
12.6 98.1
— 90.6
27
12.6 103.2
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
7
457
= 1.53%
POWER
SUPPLY
MOCP*
225/225
250/250
250/225
250/250
250/250
250/250
100
110
110
125
110
125
80
90
90
100
100
110
250/250
300/250
250/250
300/300
300/300
300/300
110
125
125
125
125
150
100
110
110
110
110
125