LEGEND AND NOTES FOR TABLES 2A AND 2B

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP— Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*The values listed in this table do not include power exhaust. See table below for power exhaust requirements.

†Used to determine minimum disconnect per NEC. **Fuse or HACR circuit breaker.

††Fuse only.

***Compressor no. 1 data indicated in table.

208/230-3-60: Compressor no. 2 RLA is 14.1 amps and LRA is 105 amps.

460-3-60: Compressor no. 2 RLA is 7.1 amps and LRA is 55 amps.

575-3-60: Compressor no. 2 RLA is 6.4 amps and LRA is 40 amps.

POWER EXHAUST ELECTRICAL DATA

POWER EXHAUST

MCA

MCA

MCA

MOCP

(for separate

PART NO.

(230 v)

(460 v)

(575 v)

power source)

CRPWREXH021A00

N/A

0.9

N/A

15

CRPWREXH022A00

3.3

N/A

1.32

15

CRPWREXH023A00

N/A

1.8

N/A

15

CRPWREXH024A00

1.6

N/A

0.64

15

CRPWREXH025A00

N/A

0.9

N/A

15

CRPWREXH026A00

3.3

N/A

1.32

15

CRPWREXH027A00

N/A

1.8

N/A

15

CRPWREXH028A00

1.7

N/A

0.68

15

CRPWREXH029A00

N/A

1.0

N/A

15

CRPWREXH030A00

1.6

N/A

0.64

15

N/A — Not available

NOTE: If a single power source is to be used, size wire to include power exhaust MCA and MOCP. Must be in accordance with NEC or local codes.

Check MCA and MOCP when power exhaust is powered through the unit. Determine the new MCA including the power exhaust using the fol- lowing formula:

MCA New = MCA unit only + MCA of Power Exhaust

For example, using a 580FPV090 unit with MCA = 40.1 and MOCP

=45, with CRPWREXH030A00 power exhaust. MCA New = 40.1 amps + 1.6 amps = 41.7 amps

If the new MCA does not exceed the published MOCP, then MOCP would not change. The MOCP in this example is 45 amps and the MCA New is below 45; therefore the MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise the MOCP to the next larger size. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.

NOTES:

1.In compliance with NEC requirements for multimotor and combina- tion load equipment (refer to NEC Articles 430 and 440), the overcur- rent protective device for the unit shall be fuse or HACR breaker. Canadian units may be fuse or circuit breaker.

2.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 percent of voltage imbalance.

% Voltage Imbalance

= 100 x

max voltage deviation from average voltage

average voltage

 

Example: Supply voltage is 460-3-60.

AB = 452 v BC = 464 v AC = 455 v

Average Voltage = 452 + 464 + 455 3

1371

=

3

= 457

Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

 

7

457

= 1.53%

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—

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Bryant 580F installation instructions Power Exhaust Electrical Data MCA Mocp, Unbalanced 3-Phase Supply Voltage
Page 13 Page 15

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