Bryant 581B manual ELECTRICAL DATA cont, 12.4

ELECTRICAL DATA (cont)

581B090-120 HIGH-STATIC MOTOR (Units Without Electrical Convenience Outlet)

	NOMINAL	VOLTAGE		COMPRESSOR					COMBUSTION	POWER		MINIMUM UNIT
UNIT							OFM	IFM				DISCONNECT
	VOLTAGE	RANGE			(each)				FAN MOTOR	SUPPLY
581B													SIZE*
	(V-Ph-Hz)
		Min	Max	RLA		LRA	FLA	FLA	RLA	MCA	MOCP	FLA		LRA
	208/230-3-60	187	254	12.4		88.0	1.4	10.6	0.6	41.3	45†	44		267
090	460-3-60	414	508	6.4		44.0	0.7	4.8	0.3	20.6	25†	22		134
	575-3-60	518	632	4.8		34.0	0.7	4.8	0.3	15.8	20†	17		95
	208/230-3-60	187	254	15.0		99.0	1.4	10.6	0.6	47.2	60†	50		264
102	460-3-60	414	508	8.2		49.5	0.7	4.8	0.3	24.7	30†	26		132
	575-3-60	518	632	5.8		40.0	0.7	4.8	0.3	18.0	20†	19		107
	208/230-3-60	187	254	17.3		125.0	1.4	15.0	0.6	56.7	70	61		360
120	460-3-60	414	508	9.0		62.0	0.7	7.4	0.3	29.1	35†	29		181
	575-3-60	518	632	7.1		50.0	0.7	7.4	0.3	23.0	25†	23		136

581B090-120 HIGH-STATIC MOTOR (Units With Electrical Convenience Outlet)

	NOMINAL	VOLTAGE		COMPRESSOR			OFM	IFM	COMBUSTION	POWER		MINIMUM UNIT
UNIT												DISCONNECT
	VOLTAGE	RANGE			(each)				FAN MOTOR	SUPPLY
581B													SIZE*
	(V-Ph-Hz)
		Min	Max	RLA		LRA	FLA	FLA	RLA	MCA	MOCP	FLA		LRA
	208/230-3-60	187	254	12.4		88.0	1.4	10.6	0.6	47.3	50†	49		267
090	460-3-60	414	508	6.4		44.0	0.7	4.8	0.3	23.3	25†	24		134
	575-3-60	518	632	4.8		34.0	0.7	4.8	0.3	18.5	20†	19		95
	208/230-3-60	187	254	15.0		99.0	1.4	10.6	0.6	53.2	60†	55		264
102	460-3-60	414	508	8.2		49.5	0.7	4.8	0.3	27.4	30†	28		132
	575-3-60	518	632	5.8		40.0	0.7	4.8	0.3	20.7	25†	21		107
	208/230-3-60	187	254	17.3		125.0	1.4	15.0	0.6	62.7	70	66		360
120	460-3-60	414	508	9.0		62.0	0.7	7.4	0.3	31.8	35†	32		181
	575-3-60	518	632	7.1		50.0	0.7	7.4	0.3	25.7	30†	25		147

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, Canada 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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