Bryant 581A operation manual

Table 4B — Electrical Data — Units With Optional Convenience Outlet

581A	NOMINAL	VOLTAGE				COMPRESSOR						OFM			IFM			POWER			COMBUSTION	POWER SUPPLY			DISCONNECT
	VOLTAGE	RANGE		No. 1			No. 2		No. 3								EXHAUST				FAN MOTOR				SIZE
UNIT	(3 Ph,
SIZE		Min	Max	RLA	LRA		RLA	LRA	RLA	LRA	Qty	Hp	FLA	Hp	FLA		Qty		Hp	FLA	FLA	MCA		MOCP*	FLA
	60 Hz)												(ea)							(ea)
														3.7	10.6/	9.6	—		—	—		83/ 82		100/100	89/ 88
	208/230	187	253	16.7	130		16.7	130	22.4	184	4	0.25	1.5				2		1	5.9	0.5	95/	94	100/100	103/101
														5	16.7/15.2		—		—	—		89/ 88		100/100	96/ 94
																	2		1	5.9		101/	99	110/100	110/108
														3.7	4.8		—		—	—		42		50	45
210	460	414	506	9	70		9	70	10.7	90	4	0.25	0.7				2		1	3.1	0.3	48		50	52
														5	7.6		—		—	—		45		50	48
																	2		1	3.1		51		60	56
														3	3.9		—		—	—		35		40	38
	575	518	633	7	55		7	55	9.3	73	4	0.25	0.7				2		1	2.4	0.24	40		45	43
														5	6.1		—		—	—		38		45	40
																	2		1	2.4		42		50	46
														5	16.7/15.2		—		—	—		101/ 99		110/100	109/107
	208/230	187	253	22.4	184		22.4	184	22.4	184	4	0.25	1.5				2		1	5.9	0.5	112/111		125/125	123/121
														7.5	24.2/22		—		—	—		108/106		125/125	118/115
																	2		1	5.9		120/118		125/125	131/129
														5	7.6		—		—	—		48		50	52
240	460	414	506	10.7	90		10.7	90	10.7	90	4	0.25	0.7				2		1	3.1	0.3	54		60	59
														7.5	11		—		—	—		52		60	56
																	2		1	3.1		58		60	63
														5	6.1		—		—	—		42		50	46
	575	518	633	9.3	73		9.3	73	9.3	73	4	0.25	0.7				2		1	2.4	0.24	47		50	51
														7.5	9		—		—	—		45		50	49
																	2		1	2.4		50		50	55
														7.5	24.2/22		—		—	—		144/142		175/175	152/150
	208/230	187	253	47.1	245		47.1	245	—	—	6	0.25	1.5				2		1	5.9	0.5	156/154		200/200	166/163
														10	30.8/28		—		—	—		151/148		175/175	160/157
																	2		1	5.9		163/160		200/200	173/170
														7.5	11		—		—	—		62		80	66
300	460	414	506	19.6	125		19.6	125	—	—	6	0.25	0.7				2		1	3.1	0.3	69		80	73
														10	14		—		—	—		65		80	69
																	2		1	3.1		72		90	77
														7.5	9		—		—	—		52		60	55
	575	518	633	15.8	100		15.8	100	—	—	6	0.25	0.7				2		1	2.4	0.24	57		60	60
														10	11		—		—	—		54		60	57
																	2		1	2.4		59		60	63

		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.

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 voltage imbalance.

% Voltage Imbalance = 100 x

7

NOTES:

1.In compliance with NEC requirements for multimotor and combination load equip- ment (refer to NEC Articles 430 and 440), the overcurrent 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 percent 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 maximum allow- able 2%.

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

3.The convenience outlet full load amps (FLA) are 5, 3, and 3 for 208/230, 460, 575-V units, respectively.

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