Bryant 581A/B manual Exhaust FAN Motor Supply, Rla Lra, FLA LRA MCA Mocp, Fla, Hacr, Nec

ELECTRICAL DATA

UNIT	NOMINAL	VOLTAGE			COMPRESSOR						OFM			IFM	POWER		COMBUSTION	POWER
	VOLTAGE	RANGE		No. 1		No. 1A		No. 2							EXHAUST		FAN MOTOR	SUPPLY
580F	(3 Ph, 60 Hz)
		Min	Max	RLA	LRA	RLA	LRA	RLA	LRA	Qty	Hp	FLA (ea)	Hp	FLA	FLA	LRA	FLA	MCA	MOCP*
	208/230	187	253	32.1	195	—	—	20.7	156	3	0.5	1.7	5.0	15.8/15.8	—	—	0.57	82/82	110/110
															4.6	18.8	0.57	86/86	110/110
180	460	414	508	16.4	95	—	—	10	70	3	0.5	0.8	5.0	7.9	—	—	0.30	41	50
															2.3	6.0	0.30	43	50
	575	518	633	12	80	—	—	8.2	54	3	0.5	0.75	5.0	6.0	—	—	0.57	31	40
															2.1	4.8	0.57	34	40
	208/230	187	253	30.1	225	—	—	28.8	195	3	0.5	1.7	5.0	15.8/15.8	—	—	0.57	87/87	110/110
															4.6	18.8	0.57	92/92	110/110
210	460	414	508	15.5	114	—	—	14.7	95	3	0.5	0.8	5.0	7.9	—	—	0.30	44	50
															2.3	6.0	0.30	47	60
	575	518	632.5	12.1	80	—	—	10.7	80	3	0.5	0.75	5.0	6.0	—	—	0.57	34	40
															2.1	4.8	0.57	36	40
	208/230	187	253	42	239	—	—	33.6	225	2	1	6.6	7.5	25.0/25.0	—	—	0.57	124/124	150/150
															4.6	18.8	0.57	129/129	150/150
240	460	414	508	19.2	125	—	—	17.3	114	2	1	3.3	7.5	13.0	—	—	0.30	61	80
															2.3	6.0	0.30	63	80
	575	518	633	13.8	80.0	—	—	13.5	80.0	2	1.0	3.4	7.5	10.0	—	—	0.57	48	60
															2.1	4.8	0.57	50	60
	208/230	187.2	253	20.7	156	20.7	156	47.1	245	6	0.5	1.7	10.0	28.0/28.0	—	—	0.57	138/138	175/175
															4.6	18.8	0.57	143/143	150/175
300	460	414	508	10	75	10	75	19.6	125	6	0.5	0.8	10.0	14.6	—	—	0.30	64	80
															2.3	6	0.30	66	80
	575	517.5	632.5	8.2	54	8.2	54	15.8	100	6	0.5	0.8	10.0	13.0	—	—	0.57	54	60
															2.1	4.8	0.57	56	70
	LEGEND											% Voltage Imbalance

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

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combination load

max voltage deviation from average voltage

= 100 x

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 voltage imbalance.

equipment (refer to NEC Articles 430 and 440), the overcurrent protective

% Voltage Imbalance = 100 x

7

580F180-300

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 voltage

imbalance.

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

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