Carrier 12 Installation And Service Instructions Manual page 11

VOLTAGE
RANGE
UNIT NOMINAL
50LJQ V-PH-HZ
Min Max RLA LRA
220-3-50 198 242
008
400-3-50 360 440
220-3-50 198 242
012
400-3-50 360 440
LEGEND
COMPR — Compressor
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor-Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
OFM — Outdoor-Fan Motor
RLA — Rated Load Amps
*Heaters are field-installed only. Heater capacity (kW) is based on
heater voltage of 230 v or 400 v. If power distribution voltage to unit
varies from rated heater voltage, heater kW will vary
accordingly.
†Fuse or HACR circuit breaker.
**Requires 2 heater packages.
NOTES:
1. MCA and MOCP values are calculated in accordance with NEC
(National Electric Code) (U.S.A. Standard), Article 440.
2. Motor RLA and FLA values are established in accordance with UL
(Underwriters' Laboratories) Standard 465 (U.S.A. Standard).
3. 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 % voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Table 2 — Electrical Data
COMPR
OFM IFM
(each)
FLA Hp FLA Nominal
15.3 82.0 1.5 1.5 5.8
7.7 41.0 1.5 1.5 2.6
19.6 105.0 1.5 2.0 7.5
10.4 55.0 1.5 2.0 3.5
ELECTRIC HEAT POWER SUPPLY ELECTRIC HEAT
FLA MCA MOCP†
kW*
— — 41.7
9.5 24.7 70.3
14.6 38.0 85.7
22.7 59.0 130.0
29.3 76.2 158.5
38.8 100.9 179.5
10.5 15.2 21.4
12.5 18.0 44.0
21.0 30.3 59.3
25.0 36.1 66.5
31.5 45.5 78.3
— — 53.1
9.5 24.7 81.6
14.6 38.0 97.1
29.3 76.2 141.3
43.9 114.1 190.9
10.5 15.2 28.4
12.5 18.0 51.0
21.0 30.3 66.3
25.0 36.1 73.5
31.5 45.5 85.2
37.5 54.2 96.6
Example: Supply voltage is 400-3-50.
Determine maximum deviation from average voltage.
(AB) 397 − 393 = 4 v
(BC) 403 − 397 = 6 v
(AC) 397 − 396 = 1 v
Maximum deviation is 6 v.
Determine % 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.
11
ELECTRIC HEAT
POWER WIRING
FIG. NO.
50 —
80 10
90 10
150 11
175 11
200 12
25 7
45 7
60 8
70 8
80 9
60 —
90 10
100 10
150 11
200 13
35 7
60 7
70 8
80 8
90 9
100 9
AB = 393 v
BC = 403 v
AC = 396 v
393 + 403 + 396
Average Voltage =
3
1192
= = 397
3
6
= 1.5%
397
PART NO.
50DJ901—
—
711
601
611
621
711, 621**
681
631
641
651
681, 641**
—
711
601
621
601, 621**
681
631
641
651
681, 641**
631, 651**