Carrier 38AU 16 Series - Page 19

19
Legend and Notes for Tables 13-14
LEGEND
NOTES
1. In compliance with NEC requirements for multimotor and combina-
tion load equipment (refer to NEC Articles 430 and 440), the over-
current protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.
2. The MCA and Fuse 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. The 575-v units are UL, Canada-listed only.
5. 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.
Example: Supply voltage is 230-3-60
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.
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
Table 14 — 38AUD Unit Wire/Fuse or HACR Breaker Sizing Data
a
NOTE(S):
a. See Legend and Notes for Tables 13 and14 on page 19.
UNIT
SIZE
38AUD
NUMBER
OF
STAGES
NOMINAL
POWER
SUPPLY
VOLTAGE
RANGE
COMPRESSOR NO C.O. OR POWERED C.O.
No. 1 No. 2 OFM Power Supply Disconnect Size
V-Ph-Hz Min Max RLA LRA RLA LRA Qty
FLA
(ea)
MCA
Fuse or
HACR
Breaker
FLA LRA
T16 3
208/230-3-60 187 253 26.8 164 25.0 164 3 1.5 63/63 80/80 65/65 337/337
460-3-60 414 506 12.0 94 12.2 100 3 0.8 29.7 40 31 200
575-3-60 518 633 9.0 65 9.9 78 3 0.7 23.5 30 24 149
T25 3
208/230-3-60 187 253 32.5 240 28.2 240 4 1.5 74.8/74.8 100/100 77/77 492/492
460-3-60 414 506 14.8 130 14.7 130 4 0.8 36.4 50 38 268
575-3-60 518 633 11.1 94 11.3 94 4 0.7 28 35 29 196
T28 3
208/230-3-60 187 253 35.3 240 48.4 245 4 1.5 101.8/101.8 150/150 103/103 497/497
460-3-60 414 506 17.0 140 19.0 125 4 0.8 44 60 45 273
575-3-60 518 633 13.0 108 16.0 100 4 0.7 35.8 50 37 216
UNIT
SIZE
38AUD
NUMBER
OF
STAGES
NOMINAL
POWER
SUPPLY
VOLTAGE
RANGE
COMPRESSOR WITH POWERED C.O.
No. 1 No. 2 OFM Power Supply Disconnect Size
V-Ph-Hz Min Max RLA LRA RLA LRA Qty
FLA
(ea)
MCA
Fuse or
HACR
Breaker
FLA LRA
T16 3
208/230-3-60 187 253 26.8 164 25.0 164 3 1.5 67.8/67.8 90/90 70/70 342/342
460-3-60 414 506 12.0 94 12.2 100 3 0.8 31.9 40 33 202
575-3-60 518 633 9.0 65 9.9 78 3 0.7 25.2 30 26 151
T25 3
208/230-3-60 187 253 32.5 240 28.2 240 4 1.5 79.6/79.6 100/100 82/82 497/497
460-3-60 414 506 14.8 130 14.7 130 4 0.8 38.6 50 40 270
575-3-60 518 633 11.1 94 11.3 94 4 0.7 29.7 40 31 198
T28 3
208/230-3-60 187 253 35.3 240 48.4 245 4 1.5 106.6/106.6 150/150 109/109 502/502
460-3-60 414 506 17.0 140 19.0 125 4 0.8 46.2 60 48 275
575-3-60 518 633 13.0 108 16.0 100 4 0.7 37.5 50 39 218
C.O. — Convenience Outlet
FLA — Full Load Amps
LRA — Locked Rotor Amps
MOCP — Maximum Over Current Protection
NEC — National Electrical Code
RLA — Rated Load Amps
% Voltage
Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
(224 + 231 + 226)
=
681
=227
33
% Voltage Imbalance = 100x
4
=1.78%
227
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
A
B
C
MOTOR