Carrier 38AUD Installation, Start-Up And Service Instructions Manual page 16

UNIT V-Ph-Hz
38AUD*16 400--- 3--- 50
38AUD*25 400--- 3--- 50
Legend and Notes for Table 8
LEGEND:
FLA --- Full Load Amps
LRA --- Locked Rotor Amps
MCA --- Minimum Circuit Amps
LRA --- Locked rotor amps
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. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker.
2. The MCA values are calculated in accordance with the NEC.
Article 440.
3. Motor RLA and LRA values are established in accordance
with Underwriters' Laboratories (UL). Standard 1995.
4. 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
determine the percentage of voltage imbalance.
Table 8 – Electrical Data — 38AUD*16- - 25 50 Hz Units
VOLTAGE
COMPRESSOR 1
RANGE‡
MIN MAX RLA LRA
380 420 12.2
380 420 16.7
COMPRESSOR 2
RLA LRA WATTS
101 12.2 101
111 16.7 111
Example: Supply voltage is 230-3-60
% Voltage Imbalance
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
=
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 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.
16
OFM (ea)
MCA
FLA
325 0.7 29.6
325 0.7 40.4
max voltage deviation from average voltage
= 100 x
average voltage
(224 + 231 + 226)
=
3
227
4
= 100 x
227
= 1.76%
FUSE
SIZE SIZE
40
50
681
3