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38AU
Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data
| NOMINAL | VOLTAGE |
| COMPRESSOR |
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| NO C.O. or UNPWRD C.O. |
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| POWER |
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UNIT | RANGE | No. 1 | No. 2 |
| OFM | POWER SUPPLY | DISCONNECT SIZE | |||||||
SUPPLY |
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SIZE |
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38AU |
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| FLA |
| FUSE or |
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| Min | Max | RLA | LRA | RLA | LRA | Qty |
| MCA | HACR | FLA | LRA | ||
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| BRKR |
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| 187 | 253 | 25.0 | 164 | 25.0 | 164 | 3 |
| 1.5 | 60.8/60.8 | 80/80 | 63/63 | 337/337 | |
D*16 |
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414 | 506 | 12.2 | 100 | 12.2 | 100 | 3 |
| 0.8 | 29.9 | 40 | 31 | 206 | ||
Z*16 |
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| 518 | 633 | 9.0 | 78 | 9.0 | 78 | 3 |
| 0.7 | 22.4 | 30 | 23 | 162 | |
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| 187 | 253 | 30.1 | 225 | 30.1 | 225 | 4 |
| 1.5 | 73.7/73.7 | 100/100 | 76/76 | 462/462 | |
D*25 |
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414 | 506 | 16.7 | 114 | 16.7 | 114 | 4 |
| 0.8 | 40.8 | 50 | 42 | 236 | ||
Z*25 |
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| 518 | 633 | 12.2 | 80 | 12.2 | 80 | 4 |
| 0.7 | 30.3 | 40 | 31 | 168 | |
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| NOMINAL | VOLTAGE |
| COMPRESSOR |
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| w/ PWRD C.O. |
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| POWER |
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UNIT | RANGE | No. 1 | No. 2 |
| OFM | POWER SUPPLY | DISCONNECT SIZE | |||||||
SUPPLY |
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SIZE |
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38AU |
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| FLA |
| FUSE or |
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| Min | Max | RLA | LRA | RLA | LRA | Qty |
| MCA | HACR | FLA | LRA | ||
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| (ea) | ||||||||||||
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| BRKR |
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| 187 | 253 | 25.0 | 164 | 25.0 | 164 | 3 |
| 1.5 | 65.6/65.6 | 90/90 | 68/68 | 342/342 | |
D*16 |
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414 | 506 | 12.2 | 100 | 12.2 | 100 | 3 |
| 0.8 | 32.1 | 40 | 33 | 208 | ||
Z*16 |
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| 518 | 633 | 9.0 | 78 | 9.0 | 78 | 3 |
| 0.7 | 24.1 | 30 | 25 | 164 | |
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| 187 | 253 | 30.1 | 225 | 30.1 | 225 | 4 |
| 1.5 | 78.5/78.5 | 100/100 | 82/82 | 467/467 | |
D*25 |
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414 | 506 | 16.7 | 114 | 16.7 | 114 | 4 |
| 0.8 | 43 | 50 | 45 | 238 | ||
Z*25 |
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| 518 | 633 | 12.2 | 80 | 12.2 | 80 | 4 |
| 0.7 | 32 | 40 | 33 | 170 | |
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Legend and Notes for Table 10
LEGEND: |
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BRKR | Circuit breaker | |
CO | Convenient outlet | |
FLA | Full Load Amps | |
LRA | Locked Rotor Amps | |
MCA | Minimum Circuit Amps | |
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| Protection |
NEC | National Electrical Code | |
PWRD CO | Powered convenient outlet | |
RLA | Rated Load Amps | |
UNPWR CO | Unpowered convenient outlet |
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. Canadian units may be fuse or circuit 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.The
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 de- termine the percentage of voltage imbalance.
Example: Supply voltage is
% Voltage Imbalance = 100 x | max voltage deviation from average voltage | |
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average voltage | ||
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AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = | (224 + 231 + 226) | = | 681 | |
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3 | 3 | |||
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=227
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 | = 100 x | 4 | |
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227 | |||
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| = 1.76% |
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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.
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