Bryant 581A operation manual

Table 4A — Electrical Data — Units Without 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	—		—	—		78/ 77		100/ 90	83/ 82
	208/230	187	253	16.7	130		16.7	130	22.4	184	4	0.25	1.5				2		1	5.9	0.5	90/	89	100/100	97/	96
														5	16.7/15.2		—		—	—		84/ 83		100/100	90/ 89
																	2		1	5.9		96/	94	100/100	104/102
														3.7	4.8		—		—	—		39		45	42
210	460	414	506	9	70		9	70	10.7	90	4	0.25	0.7				2		1	3.1	0.3	45		50	49
														5	7.6		—		—	—		42		50	45
																	2		1	3.1		48		50	52
														3	3.9		—		—	—		32		40	35
	575	518	633	7	55		7	55	9.3	73	4	0.25	0.7				2		1	2.4	0.24	37		45	40
														5	6.1		—		—	—		35		40	37
																	2		1	2.4		39		45	43
														5	16.7/15.2		—		—	—		96/ 94		100/100	103/102
	208/230	187	253	22.4	184		22.4	184	22.4	184	4	0.25	1.5				2		1	5.9	0.5	107/106		125/125	117/115
														7.5	24.2/22		—		—	—		103/101		125/110	112/109
																	2		1	5.9		115/113		125/125	126/123
														5	7.6		—		—	—		45		50	49
240	460	414	506	10.7	90		10.7	90	10.7	90	4	0.25	0.7				2		1	3.1	0.3	51		60	56
														7.5	11		—		—	—		49		50	53
																	2		1	3.1		55		60	60
														5	6.1		—		—	—		39		45	42
	575	518	633	9.3	73		9.3	73	9.3	73	4	0.25	0.7				2		1	2.4	0.24	44		50	48
														7.5	9		—		—	—		42		50	46
																	2		1	2.4		47		50	51
														7.5	24.2/22		—		—	—		139/137		175/175	147/144
	208/230	187	253	47.1	245		47.1	245	—	—	6	0.25	1.5				2		1	5.9	0.5	151/149		175/175	160/158
														10	30.8/28		—		—	—		146/143		175/175	154/151
																	2		1	5.9		158/155		200/200	168/164
														7.5	11		—		—	—		59		60	63
300	460	414	506	19.6	125		19.6	125	—	—	6	0.25	0.7				2		1	3.1	0.3	66		80	70
														10	14		—		—	—		62		80	66
																	2		1	3.1		69		80	73
														7.5	9		—		—	—		49		60	52
	575	518	633	15.8	100		15.8	100	—	—	6	0.25	0.7				2		1	2.4	0.24	54		60	57
														10	11		—		—	—		51		60	54
																	2		1	2.4		56		60	59

		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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