Carrier 38AUD Installation, Start-Up And Service Instructions Manual page 21

UNIT V ---Ph---Hz
38AUZ*07 400--- 3--- 50
38AUZ*08 400--- 3--- 50
NOTE: See "Legend and Notes for Tables 11 & 12"
UNIT
V--- Ph--- Hz
38AUD*12 400--- 3--- 50
38AUD*14 400--- 3--- 50
NOTE: See "Legend and Notes for Tables 11 & 12"
Legend and Notes for Tables 11 and 12
LEGEND:
FLA --- Full Load Amps
LRA --- Locked Rotor Amps
MCA --- Minimum Circuit Amps
Protection
NEC --- National Electrical Code
RLA --- Rated Load Amps
} Units are suitable for use on electrical systems where voltage
supplied to the unit terminals is not below or above the listed
limits.
NOTES:
1. The MCA and Fuse values are calculated in accordance with
The NEC. Article 440.
2. Motor RLA and LRA values are established in accordance
with Underwriters' Laboratories (UL). Standard 1995.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to de-
termine the percentage of voltage imbalance.
Table 11 – Electrical Data — 38AUZ*07- - 14 50 Hz Units
VOLTAGE
COMPRESSOR 1
RANGE }
MIN MAX RLA
360 440 9.7
360 440 12.2
Table 12 – Electrical Data — 38AUD*12- - 14 50 Hz Units
VOLTAGE COMPRESSOR
RANGE } 1
MIN MAX RLA LRA
360 440 7.8 52
360 440 10.6 74
OFM
LRA OTY FLA
64 2 .07
100 2 .07
COMPRESSOR
OFM (ea)
2
RLA LRA QTY FLA
7.8 52 2
10.6 74 2
Example: Supply voltage is 400-3-50
% Voltage Imbalance = 100 x
AB = 394 v
BC = 401 v
AC = 396 v
(394 + 401 + 396)
Average Voltage =
=
Determine maximum deviation from average voltage.
(AB) 397 – 394 = 3 v
(BC) 401 – 397 = 4 v
(AC) 397 – 396 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance
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.
21
POWER DISCONNECT
SUPPLY SIZE
MCA Fuse FLA
13.5 20 13
16.7 25 16
POWER DISCONNECT
SUPPLY
MCA Fuse FLA
0.7 19.0 25 20
0.7 25.3 30 26
max voltage deviation from average voltage
average voltage
1191
=
3
397
4
= 100 x
397
= 1.00%
LRA
68
104
SIZE
LRA
108
152
3