Bryant 581B installation instructions Size†, FAN Motor Supply

Table 2C — Electrical Data — High-Static Motor Units Without Electrical Convenience Outlet

	NOMINAL	VOLTAGE			COMPRESSOR		OFM	IFM	COMBUSTION	POWER		MINIMUM UNIT
UNIT												DISCONNECT
	VOLTAGE	RANGE			(each)		(each)		FAN MOTOR	SUPPLY*
581B													SIZE†
	(V-Ph-Hz)
		Min	Max	Qty	RLA	LRA	FLA	FLA	RLA	MCA	MOCP**	FLA		LRA
	208/230-3-60	187	254		10.3	77.0	0.7	5.8	0.6	19.4	25	19		120
036	460-3-60	414	508	1	5.1	39.0	0.4	2.6	0.3	9.4	20	9		60
	575-3-60	518	632		4.2	31.0	0.4	2.6	0.3	7.7	20	8		48
	208/230-3-60	187	254		13.5	93.0	0.7	5.8	0.6	23.4	30	23		136
048	460-3-60	414	508	1	6.4	46.5	0.4	2.6	0.3	11.0	20	11		68
	575-3-60	518	632		6.4	40.0	0.4	2.6	0.3	10.4	20	10		57
	208/230-3-60	187	254		17.3	123.0	1.5	7.5	0.6	30.6	35	30		187
060	460-3-60	414	508	1	9.0	62.0	0.8	3.4	0.3	15.5	20	15		94
	575-3-60	518	632		7.1	50.0	0.8	3.4	0.3	12.2	20	12		76
	208/230-3-60	187	254		20.5	156.0	1.4	7.5	0.6	34.5	40	34		219
072	460-3-60	414	508	1	9.6	75.0	0.6	3.4	0.3	16	20	16		107
	575-3-60	518	632		7.7	56.0	0.6	3.4	0.3	12.8	20	13		81
	Table 2D — Electrical Data — High-Static Motor Units With Electrical Convenience Outlet
	NOMINAL	VOLTAGE			COMPRESSOR		OFM		COMBUSTION	POWER		MINIMUM UNIT
UNIT								IFM				DISCONNECT
	VOLTAGE	RANGE			(each)		(each)		FAN MOTOR	SUPPLY*
581B													SIZE†
	(V-Ph-Hz)
		Min	Max	Qty	RLA	LRA	FLA	FLA	RLA	MCA	MOCP**	FLA		LRA
	208/230-3-60	187	254		10.3	77.0	0.7	5.8	0.6	25.4	30	25		124
036	460-3-60	414	508	1	5.1	39.0	0.4	2.6	0.3	12.1	20	12		63
	575-3-60	518	632		4.2	31.0	0.4	2.6	0.3	9.8	20	10		50
	208/230-3-60	187	254		13.5	93.0	0.7	5.8	0.6	29.4	35	29		140
048	460-3-60	414	508	1	6.4	46.5	0.4	2.6	0.3	13.7	20	13		70
	575-3-60	518	632		6.4	40.0	0.4	2.6	0.3	12.6	20	12		59
	208/230-3-60	187	254		17.3	123.0	1.5	7.5	0.6	36.6	40	36		192
060	460-3-60	414	508	1	9.0	62.0	0.8	3.4	0.3	18.2	20	18		96
	575-3-60	518	632		7.1	50.0	0.8	3.4	0.3	14.4	20	14		77
	208/230-3-60	187	254		20.5	156.0	1.4	7.5	0.6	40.5	45	39		224
072	460-3-60	414	508	1	9.6	75.0	0.6	3.4	0.3	18.7	25	18		109
	575-3-60	518	632		7.7	56.0	0.6	3.4	0.3	15.0	20	15		83

	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
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 phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the percent 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.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 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

POWER EXHAUST	MCA	MCA	MCA	MOCP
				(for separate
PART NO.	(230 v)	(460 v)	(575 v)
				power source)
CRPWREXH021A01	N/A	0.9	N/A	15
CRPWREXH022A01	3.3	N/A	1.32	15
CRPWREXH023A01	N/A	1.8	N/A	15
CRPWREXH028A01	1.7	N/A	0.68	15
CRPWREXH029A01	N/A	1.0	N/A	15
CRPWREXH030A01	1.6	N/A	0.64	15

N/A — Not available

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. Deter- mine the new MCA including the power exhaust using the following formula:

MCA New = MCA unit only + MCA of Power Exhaust

For example, using a 581B072 unit with MCA = 32.8 and MOCP = 40, with CRPWREXH030A01 power exhaust.

MCA New = 32.8 amps + 1.6 amps = 34.4 amps

If the new MCA does not exceed the published MOCP, then MOCP would not change. The MOCP in this example is 40 amps and the MCA New is below 40; 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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