Bryant 581A/B manual 581B036-150 Units, 121/2 Tons

ELECTRICAL DATA (cont)

581B036-150 UNITS

	UNIT SIZE	NOMINAL		CONV	VOLTAGE		COMPRESSOR (each)			OFM (each)		IFM	COMBUSTION	POWER SUPPLY*		MINIMUM UNIT
			IFM TYPE		RANGE								FAN MOTOR			DISCONNECT SIZE†
	581B	V-PH-Hz		OUTLET								FLA
					Min	Max	Qty	RLA	LRA	Qty	FLA		FLA	MCA	MOCP**	FLA	LRA
			STD	NO								7.5		40.2	45	42	276
		208/230-3-60		YES	187	254	2	13.1	105	2	1.4		0.6	46.2	50	48	281
			HIGH	NO								10.6		43.3	50	46	301
				YES										49.3	60	51	305
			STD	NO								3.4		21.5	25	23	143
		460-3-60		YES	414	508	2	7.4	55	2	0.7		0.3	24.2	30	25	145
	102		HIGH	NO								4.8		22.9	25	24	156
	(81/2 Tons)			YES										25.6	30	27	158
			STD	NO								2.8		18.2	20	19	115
				YES							0.6		0.3	20.4	25	21	116
		575-3-60	HIGH	NO	518	632	2	6.4	44	2		3.3		18.9	25	20	124
				YES										21.1	25	22	126
			PH	NO							0.7	4.8	0.3	19.4	25	20	124
150				YES										21.5	25	22	126
			STD	NO								10.6	0.6	53.0	60	56	341
581B036-		208/230-3-60		YES	187	254	2	17.6	125	2	1.4			59.0	70	61	345
	120			NO										27.5	30	29	182
			HIGH	NO								15.0	0.6	57.4	70	61	364
				YES										63.4	70	66	369
			STD	NO								4.8		24.9	30	26	171
		460-3-60		YES	414	508	2	8.3	62.5	2	0.7		0.3	27.6	30	29	173
	(10 Tons)		HIGH									7.4
				YES										30.2	35	32	184
			STD	NO								3.3	0.3	19.1	25	20	136
				YES						2	0.6			21.3	25	22	138
		575-3-60	HIGH	NO	518	632	2	6.3	50			5.6	0.3	21.0	25	23	146
				YES										23.1	25	25	148
			PH	NO						2	0.7	7.4	0.3	21.2	25	23	146
				YES										23.4	25	25	148
		208/230-3-60	STD	NO	187	254	2	19	156	2	1.4	15.0	0.6	60.6	70	64	426
				YES										66.6	70	70	431
		460-3-60	STD	NO	414	508	2	9	75	2	0.7	7.4	0.3	29.1	35	31	207
	150			YES										31.8	35	33	209
	(121/2 Tons)		ST	NO						2	0.6	5.6	0.3	23.5	30	25	154
		575-3-60		YES	518	632	2	7.4	54					25.6	30	27	156
			PH	NO						2	0.7	7.4	0.3	23.7	30	25	154
				YES										25.9	30	27	156

LEGEND

Determine percent of voltage imbalance.

CONV	— Convenience Outlet
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
PH	— Perfect Humidity™ Dehumidification System
RLA	— Rated Load Amps
UL	— Underwriters’ Laboratories

*The values listed in this table do not include power exhaust. See table at right for power exhaust requirements.

†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. The UL, Canada units may be fuse or circuit breaker.

2.Electrical data based on 95 F ambient outdoor-air temperature ± 10% voltage.

3.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.

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.

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	036-072*	1.6	N/A	0.64	15
CRPWREXH021A01	036-072	N/A	0.68	N/A	15
CRPWREXH022A01	090-150*	3.4	N/A	1.32	15
CRPWREXH023A01	090-150	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

N/A — Not Available *Single or three phase.

NOTE: 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. 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 581B060 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 and 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.

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