Bryant 581B manual ELECTRICAL DATA cont, Nominal

ELECTRICAL DATA (cont)

581B090-150 STANDARD MOTOR (Units Without Electrical Convenience Outlet)

	NOMINAL	VOLTAGE						COMBUSTION	POWER		MINIMUM UNIT
UNIT				COMPRESSOR		OFM	IFM		SUPPLY		DISCONNECT
	VOLTAGE	RANGE						FAN MOTOR
581B									WITH OUTLET			SIZE*
	(V-Ph-Hz)
		Min	Max	RLA	LRA	FLA	FLA	FLA	MCA	MOCP	FLA		LRA
	208/230-3-60	187	254	12.4	88.0	1.4	7.5	.57	38.2/38.2	45/45†	40/40		242/242
090	460-3-60	414	508	6.4	44.0	0.7	3.4	.30	19.2	25†	20		121
	575-3-60	518	632	4.8	34.0	0.7	3.4	.30	14.6	20†	16		95
	208/230-3-60	187	254	15.0	99.0	1.4	7.5	.57	44.1/44.1	50/50†	46/46		264/264
102	460-3-60	414	508	8.2	49.5	0.7	3.4	.30	23.3	30†	24		132
	575-3-60	518	632	5.8	40.0	0.7	3.4	.30	16.9	20†	18		107
	208/230-3-60	187	254	18.9	125.0	1.4	10.6	.57	55.9/55.9	60/60†	59/59		341/341
120	460-3-60	414	508	9.0	62.5	0.7	4.8	.30	26.5	30†	28		171
	575-3-60	518	632	7.1	50.0	0.7	4.8	.30	20.9	25†	22		136
	208/230-3-60	187	254	19.0	156.0	1.4	15.0	.57	60.6/60.6	70/70	64/64		426/426
150	460-3-60	414	508	9.0	70.0	0.7	7.4	.30	29.1	35†	31		197
	575-3-60	518	632	7.4	54.0	0.7	7.4	.30	23.7	30†	25		154

581B090-150 STANDARD MOTOR (Units With Electrical Convenience Outlet)

	NOMINAL	VOLTAGE						COMBUSTION	POWER		MINIMUM UNIT
UNIT				COMPRESSOR		OFM	IFM		SUPPLY		DISCONNECT
	VOLTAGE	RANGE						FAN MOTOR
581B									WITH OUTLET			SIZE*
	(V-Ph-Hz)
		Min	Max	RLA	LRA	FLA	FLA	FLA	MCA	MOCP	FLA		LRA
	208/230-3-60	187	254	12.4	88.0	1.4	7.5	.57	44.2/44.2	50/50†	46/46		247/247
090	460-3-60	414	508	6.4	44.0	0.7	3.4	.30	21.9	25†	23		124
	575-3-60	518	632	4.8	34.0	0.7	3.4	.30	16.8	20†	18		97
	208/230-3-60	187	254	15.0	99.0	1.4	7.5	.57	50.1/50.1	60/60†	52/52		269/269
102	460-3-60	414	508	8.2	49.5	0.7	3.4	.30	26.0	30†	27		135
	575-3-60	518	632	5.8	40.0	0.7	3.4	.30	19.1	25†	20		109
	208/230-3-60	187	254	18.9	125.0	1.4	10.6	.57	61.9/61.9	70/70	64/64		345/345
120	460-3-60	414	508	9.0	62.5	0.7	4.8	.30	29.2	35†	30		173
	575-3-60	518	632	7.1	50.0	0.7	4.8	.30	23.1	25†	24		139
	208/230-3-60	187	254	19.0	156.0	1.4	15.0	.57	66.6/66.6	80/70	70/70		430/430
150	460-3-60	414	508	9.0	70.0	0.7	7.4	.30	31.8	35†	33		199
	575-3-60	518	632	7.4	54.0	0.7	7.4	.30	25.9	30†	27		156

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

UL — Underwriters’ Laboratories

*Used to determine minimum disconnect per NEC.

†Fuse or HACR circuit breaker 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. The

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage =

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.

UL, Canadian approved units may be fuse or circuit breaker.

2. Unbalanced 3-Phase Supply Voltage

% Voltage Imbalance = 100 x

7

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

457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

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