Bryant 581B manual Electrical Data, Rla Lra Fla Mca Mocp†

ELECTRICAL DATA (cont)

581B036-072 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	10.3		77.0	0.7	5.8	0.6	19.4/19.4	25/25	19/19		120/120
036	460-3-60	414	508	5.1		39.0	0.4	2.6	0.3	9.4	15	9		60
	575-3-60	518	632	4.2		31.0	0.4	2.6	0.3	7.7	15	8		48
	208/230-3-60	187	254	13.5		99.0	0.7	5.8	0.6	23.4/23.4	30/30	23/23		142/142
048	460-3-60	414	508	7.4		49.5	0.4	2.6	0.3	12.3	15	12		71
	575-3-60	518	632	5.8		40.0	0.4	2.6	0.3	9.7	15	9		57
	208/230-3-60	187	254	17.3		123.0	1.5	7.5	0.6	30.6/30.6	35/35	30/30		187/187
060	460-3-60	414	508	9.0		62.0	0.8	3.4	0.3	15.5	20	15		94
	575-3-60	518	632	7.1		50.0	0.8	3.4	0.3	12.2	15	12		76
	208/230-3-60	187	254	20.5		156.0	1.4	7.5	0.6	30.6/30.6	35/35	30/30		187/187
072	460-3-60	414	508	9.6		70.0	0.6	3.4	0.3	15.5	20	15		94
	575-3-60	518	632	7.7		56.0	0.6	3.4	0.3	12.2	15	12		76

581B036-072 HIGH-STATIC MOTOR (Units With 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	10.3		77.0	0.7	5.8	0.6	25.4/25.4	30/30	25	124/124
036	460-3-60	414	508	5.1		39.0	0.4	2.6	0.3	12.1	15	12	63
	575-3-60	518	632	4.2		31.0	0.4	2.6	0.3	9.8	15	10	50
	208/230-3-60	187	254	13.5		99.0	0.7	5.8	0.6	29.4/29.4	35/35	29	146/146
048	460-3-60	414	508	7.4		49.5	0.4	2.6	0.3	15.0	20	14	73
	575-3-60	518	632	5.8		40.0	0.4	2.6	0.3	11.8	15	11	59
	208/230-3-60	187	254	17.3		123.0	1.5	7.5	0.6	36.6/36.6	40/40	36	192/192
060	460-3-60	414	508	9.0		62.0	0.8	3.4	0.3	18.2	20	18	96
	575-3-60	518	632	7.1		50.0	0.8	3.4	0.3	14.4	20	14	77
	208/230-3-60	187	254	20.5		156.0	1.4	7.5	0.6	40.5/40.5	45/45	39	224/224
072	460-3-60	414	508	9.6		70.0	0.6	3.4	0.3	18.7	25	18	104
	575-3-60	518	632	7.7		56.0	0.6	3.4	0.3	15.0	20	15	89

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.

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. UL, Canada 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.

= 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

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.

% Voltage Imbalance = 100 x		7
	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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