Bryant 581A operation manual Electrical Data

Table 2 — Electrical Data

	NOMINAL	VOLTAGE				COMPRESSOR				OFM			IFM		POWER		COMBUSTION	POWER
UNIT	VOLTAGE	RANGE			No. 1		No. 2								EXHAUST		FAN MOTOR	SUPPLY
581A	(3 Ph, 60
	Hz)	Min	Max	RLA		LRA	RLA	LRA	Qty	Hp	FLA (ea)	Hp		FLA	FLA	LRA	FLA	MCA	MOCP*
015	208/230	187	253	20.7		156	19.3	123	3	0.5	1.7	2.9		8.8/	—	—	0.57	59/59	70/70
														8.4	4.6	18.8	0.57	64/63	80/80
(Standard
															—	—	0.30	29	35
IFM)	460	414	508	10		70	10	62	3	0.5	0.8	2.9		4.2
															2.3	6.0	0.30	31	40
015	208/230	187	253	20.7		156	19.3	123	3	0.5	1.7	3.7		11.0/	—	—	0.57	61/61	80/80
														10.5	4.6	18.8	0.57	66/65	80/80
(Optional
															—	—	0.30	30	35
IFM)	460	414	508	10		70	10	62	3	0.5	0.8	3.7		4.8
															2.3	6.0	0.30	32	40
	208/230	187	253	32.1		195	20.7	156	3	0.5	1.7	5.0		15.8/	—	—	0.57	82/82	110/110
														15.8	4.6	18.8	0.57	86/86	110/110
017
	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
	208/230	187	253	42		239	33.6	225	2	1	6.6	7.5		25.0/	—	—	0.57	124/124	150/150
														25.0	4.6	18.8	0.57	129/129	150/150
025
	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

		LEGEND
FLA	—	Full Load Amps
HACR —		Heating, Air Conditioning and
IFM	—	Refrigeration
		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 equipment (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

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.

max voltage deviation from average voltage

% Voltage Imbalance = 100 x

7

= 100 x

average voltage

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.

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