Bryant 581A/B manual Unit Size Nominal IFM Voltage Range

ELECTRICAL DATA (cont)

UNIT SIZE	NOMINAL	IFM	NO	VOLTAGE RANGE		COMPRESSOR (each)			OFM (each)		IFM	COMBUSTION	49.1	60	MINIMUM UNIT		580F036-
															52	316
			CONV									FAN MOTOR	POWER SUPPLY		DISCONNECT SIZE*
580F	V-PH-Hz	TYPE	OUTLET	Min	Max	Qty	RLA	LRA	Qty	FLA	FLA	FLA	MCA	MOCP†	FLA	LRA
		STD	NO								5.8		44.3	50	46	272
	208/230-3-60		YES	187	254	2	17.3	120.0	2	1.4		0.6	49.1	60	52	277
		HIGH									10.6						151
			NO										21.0	25	22	149
			YES										53.9	60	57	320
		STD									2.6
103	460-3-60		YES	414	508	2	7.9	70.0	2	0.7		0.3	23.2	30	24	151
(81/2 Ton)		HIGH	NO								4.8		23.2	30	24	171
			YES										25.4	30	27	173
		STD	NO								2.0		16.7	20	17	109
	575-3-60		YES	518	632	2	5.5	50.0	2	0.6		0.3	18.4	25	19	111
		HIGH	NO								2.8		18.5	25	19	126
			YES										20.2	25	21	128
		STD	NO								5.8		44.2	50	46	307
			YES										50.2	60	52	311
	208/230-3-60	ALT	NO	187	254	2	15.8	130	2	1.4	7.5	0.6	45.9	50	48	326
			YES										51.9	60	54	330
		HIGH	NO								15.0		53.4	60	57	374
			YES										59.4	70	62	378
		STD	NO								2.6		21.8	25	23	152
			YES										27.8	30	25	154
120	460-3-60	ALT	NO	414	508	2	7.9	64	2	0.7	3.4	0.3	22.6	25	24	191
(10 Ton)			YES										25.3	30	26	193
		HIGH	NO								7.4		26.6	30	28	185
			YES										29.3	35	31	187
		STD	NO								2.0		18.1	25	19	123
			YES										24.1	25	21	109
	575-3-60	ALT	NO	518	632	2	6.6	52	2	0.6	2.0	0.3	18.7	25	20	155
			YES										24.7	25	22	141
		HIGH	NO								2.8		21.9	30	23	150
			YES										24.6	30	25	136
		STD	NO								5.8		44.6	50	46	307
			YES										49.4	60	52	312
	208/230-3-60	ALT	NO	187	254	2	15.8	130	2	1.4	7.5	0.6	46.3	60	48	326
			YES										51.1	60	54	331
		HIGH	NO								15.0		53.8	60	57	374
			YES										58.6	70	62	379
		STD	NO								2.6		22.0	25	23	152
			YES										24.2	30	25	154
121	460-3-60	ALT	NO	414	508	2	7.9	64	2	0.7	3.4	0.3	22.8	25	24	191
(10 Ton)			YES										25.0	30	26	193
		HIGH	NO								7.4		26.8	30	28	185
			YES										29.0	35	30	187
		STD	NO								2.0		18.1	20	19	123
			YES										19.8	25	21	125
	575-3-60	ALT	NO	518	632	2	6.6	52	2	0.6	2.8	0.3	18.7	20	20	150
			YES										20.4	25	22	156
		HIGH	NO								3.3		21.9	25	23	155
			YES										23.6	25	25	151

LEGEND

Determine percent of voltage imbalance.

FLA — Full Load Amps

% Voltage Imbalance = 100 x

7

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

*Used to determine minimum disconnect per NEC. †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 of voltage imbalance.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

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.

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.

3.For units with power exhaust: If a single power source is to be used, size wire to include power exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is powered through the unit (must be in accordance with NEC and/or local codes). Determine the new MCA including the power exhaust using the following formula:

MCA New = MCA unit only + MCA of Power Exhaust

For example, using a 580F060 unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A01 power exhaust.

MCA New = 28.9 amps + 1.6 amps = 30.5 amps

If the new MCA does not exceed the published MOCP, then MOCP would not change. The MOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise the MOCP to the next larger size. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.

POWER EXHAUST ELECTRICAL DATA

					MOCP
POWER EXHAUST	APPLICATION	MCA	MCA	MCA	(separate
PART NO.	USAGE	(230 V)	(460 V)	(575 V)	power source
					only)
CRPWREXH030A01	036-073*	1.6	N/A	0.64	15
CRPWREXH021A01	036-073	N/A	0.68	N/A	15
CRPWREXH022A01	090-151*	3.4	N/A	1.32	15
CRPWREXH023A01	090-151	N/A	1.4	N/A	15
CRPWREXH028A01	ALL*	1.7	N/A	0.68	15
CRPWREXH029A01	ALL	N/A	0.7	N/A	15

*Single or three phase.

77