Bryant 580D manual Electrical Data Ð 579F180-300

ELECTRICAL DATA Ð 579F180-300

	NOMINAL	VOLTAGE			COMPRESSOR					OFM		IFM	POWER		COMBUSTION	POWER SUPPLY
		RANGE		NO. 1			NO. 2						EXHAUST		FAN MOTOR
UNIT	VOLTAGE
	(60 Hz)	Min	Max	RLA		LRA	RLA	LRA	Qty	Hp	FLA	FLA	FLA	LRA	FLA	MCA	MOCP²
											(ea)
180	208/230	187	254	61.0		266	Ð	Ð	3	1¤2	1.70	10.5/10.5	Ð	Ð	0.57	92/92	150/150
	(3 phase)												4.6	18.8	0.57	96/96	150/150
(15
	460												Ð	Ð	0.30	42	70
Tons)		414	508	28.0		120	Ð	Ð	3	1¤2	0.80	4.8
	(3 phase)												2.3	6.0	0.30	45	70
216	208/230	187	254	35.6		198	28.2	160	3	1¤2	1.70	15.8/15.8	Ð	Ð	0.57	94/94	125/125
	(3 phase)												4.6	18.8	0.57	98/98	125/125
(18
	460												Ð	Ð	0.30	47	60
Tons)		414	508	17.8		99	14.1	80	3	1¤2	0.80	7.9
													2.3	6.0	0.30	49	60
	(3 phase)
240	208/230	187	254	35.6		198	35.6	198	2	1	5.50	25.0/25.0	Ð	Ð	0.57	116/116	150/150
	(3 phase)												4.6	18.8	0.57	121/121	150/150
(20
	460												Ð	Ð	0.30	59	70
Tons)		414	508	17.8		99	17.8	99	2	1	2.80	13.0
	(3 phase)												2.3	6.0	0.30	61	70
300	208/230	187	254	43.6		228	43.6	228	2	1	5.50	28.0/28.0	Ð	Ð	0.57	137/137	175/175
	(3 phase)												4.6	18.8	0.57	142/142	175/175
(25
	460												Ð	Ð	0.30	70	90
Tons)		414	508	22.1		114	22.1	114	2	1	2.80	14.6
	(3 phase)												2.3	6.0	0.30	72	90

	LEGEND
FLA	Ð Full Load Amps
HACR	Ð Heating, Air Conditioning and Refrigeration
IFM	Ð Indoor (Evaporator) Fan Motor
LRA	Ð Locked Rotor Amps
MCA	Ð Minimum Circuit Amps
MOCP Ð Maximum Overcurrent Protection
NEC	Ð National Electrical Code
OFM	Ð Outdoor (Condenser) Fan Motor
RLA	Ð Rated Load Amps

*Used to determine minimum disconnect size per NEC. ²Fuse or HACR 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

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage = 452 + 464 + 455

=

3

1371

3

036-150 Only 180-300 Only 180-300 Only

= 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

036-072 Only 090-150 Only

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.

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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