Bryant 581A/B manual 579F180, Unit Nominal Voltage Compressor OFM IFM Power Combustion, Rla Lra

300

ELECTRICAL DATA

UNIT	NOMINAL	VOLTAGE		COMPRESSOR					OFM				IFM	POWER		COMBUSTION	POWER
	VOLTAGE	RANGE		No. 1		No. 2								EXHAUST		FAN MOTOR	SUPPLY
579F
	(3 Ph, 60 Hz)
		Min	Max	RLA	LRA	RLA	LRA	Qty	Hp	FLA (ea)		Hp	FLA	FLA	LRA	FLA	MCA	MOCP*
	208/230	187	253	28.8	195	28.8	195	3	0.5		1.7	3.7	10.5/11.0	—	—	0.57	81/81	100/100
														4.6	18.8	0.57	85/86	110/110
180	460	414	508	14.7	95	14.7	95	3	0.5		0.8	3.7	4.8	—	—	0.30	40	50
(15 Tons)														2.3	6.0	0.30	43	50
	575	518	633	10.8	80	10.8	80	3	0.5		0.8	3.0	3.9	—	—	0.57	30	40
														2.1	4.8	0.57	32	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
216	460	414	508	15.5	114	14.7	95	3	0.5		0.8	5.0	7.9	—	—	0.30	44	50
(18 Tons)														2.3	6.0	0.30	47	60
	575	518	633	12.1	80	10.8	80	3	0.5		0.8	5.0	6.0	—	—	0.57	34	40
														2.1	4.8	0.57	36	40
	208/230	187	253	37.8	239	30.1	225	2	1		6.6	7.5	25.0/25.0	—	—	0.57	116/116	150/150
														4.6	18.8	0.57	120/120	150/150
240	460	414	508	17.2	125	15.5	114	2	1		3.3	7.5	13.0	—	—	0.30	57	70
(20 Tons)														2.3	6.0	0.30	59	70
	575	518	633	12.4	80	12.1	80	2	1		3.4	7.5	10.0	—	—	0.57	44	50
														2.1	4.8	0.57	46	50
	208/230	187	253	41.0	350	37.8	239	2	1		6.6	10.0	28.0/28.0	—	—	0.57	130/130	150/150
														4.6	18.8	0.57	135/135	175/175
300	460	414	508	21.8	158	17.2	125	2	1		3.3	10.0	14.6	—	—	0.30	66	80
(25 Tons)														2.3	6.0	0.30	68	80
	575	518	633	17.3	125	12.4	80	2	1		3.4	10.0	13.0	—	—	0.57	54	70
														2.1	4.8	0.57	56	70

579F180-

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

*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 over- current protective 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 per- cent voltage imbalance.

% 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

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.

7

% Voltage Imbalance = 100 x 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%, contact your local electric utility company immediately.

166