Carrier 38AUQ Installation, Start-Up And Service Instructions Manual page 14

UNIT FACTORY-
SIZE INSTALLED
38AUQ OPTION
NONE OR DISCONNECT
CONVENIENCE OUTLET
NONE OR DISCONNECT
*07
CONVENIENCE OUTLET
NONE OR DISCONNECT
CONVENIENCE OUTLET
NONE OR DISCONNECT
CONVENIENCE OUTLET
NONE OR DISCONNECT
*08
CONVENIENCE OUTLET
NONE OR DISCONNECT
CONVENIENCE OUTLET
NONE OR DISCONNECT
CONVENIENCE OUTLET
NONE OR DISCONNECT
*12
CONVENIENCE OUTLET
NONE OR DISCONNECT
CONVENIENCE OUTLET
LEGEND
Full Load Amps
FLA —
Locked Rotor Amps
LRA —
Minimum Circuit Amps
MCA —
MOCP — Maximum Overcurrent
Protection
National Electrical Code
NEC —
Rated Load Amps
RLA —
‡
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 MOCP 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. The 575-v units are UL, Canada-listed only.
4. Convenience outlet is available as a factory-installed option and is 115-v,
1 ph, 60 Hz.
Table 8 — Electrical Data — 38AUQ*07-12 60 Hz Units
NOMINAL VOLTAGE
VOLTAGE RANGE
V-Ph-Hz MIN
208/230-3-60 187
460-3-60 414
575-3-60 518
208/230-3-60 187
460-3-60 414
575-3-60 518
208/230-3-60 187
460-3-60 414
575-3-60 518
COMPRESSOR
‡
MAX RLA LRA
253 19.0 123
506 9.7 62
633 7.4 50
253 25.0 164
506 12.2 100
633 9.0 78
253 30.1 225
506 16.7 114
633 12.2 80
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.
% Voltage Imbalance = 100 x
Example: Supply voltage is 208/230-3-60
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.
14
POWER
FAN MOTORS
SUPPLY
FLA (ea) QTY MCA MOCP
26.8 45
1.5 2
31.6 50
13.9 20
0.9 2
16.1 25
10.5 15
0.6 2
12.2 15
34.3 50
1.5 2
39.1 60
17.1 25
0.9 2
19.3 30
12.5 20
0.6 2
14.2 20
40.6 60
1.5 2
45.4 60
22.5 30
0.8 2
24.7 30
16.5 25
0.6 2
18.2 30
max voltage deviation from average voltage
average voltage
(224 + 231 + 226) 681
=
3
227
4
= 100 x
227
= 1.76%
3