LEGEND AND NOTES FOR TABLES 2A AND 2B

 

LEGEND

FLA

Full Load Amps

HACR

Heating, Air Conditioning and Refrigeration

IFM

Indoor-Fan Motor

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

LRA

Locked Rotor Amps

MCA

Minimum Circuit Amps

MOCP

Maximum Overcurrent Protection

NEC

National Electrical Code

OFM

Outdoor-Fan Motor

RLA

Rated Load Amps

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage =

452 + 464 + 455

3

*Heaters are field installed only.

†Used to determine minimum disconnect per NEC.

**Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v and 575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

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.

††Fuse or HACR circuit breaker.

Optional disconnect switch is unavailable. (Applies to units with an FLA greater or equal to 80.)

NOTES:

% Voltage Imbalance = 100 x

= 1.53%

7

457

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.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.

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%, con- tact your local electric utility company immediately.

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Bryant 548D installation instructions Fla

548D specifications

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