Bryant manual ELECTRICAL DATA — 549B cont, 549B, 549C, 46.1

ELECTRICAL DATA — 549B (cont)

549B036-120 — HIGH-STATIC MOTOR UNITS WITH ELECTRICAL CONVENIENCE OUTLET (cont)

	NOMINAL	VOLTAGE		COMPRESSOR			OFM									MINIMUM UNIT
UNIT								IFM	ELECTRIC HEAT*			POWER SUPPLY					DISCONNECT
	VOLTAGE	RANGE			(each)		(each)
549B																		SIZE
	(V-Ph-Hz)	Min	Max	RLA		LRA	FLA	FLA	kW†	FLA		MCA		MOCP		FLA		LRA
									—	—		46.1/ 46.1		50/ 50**		49/ 49		271/271
									7.8/10.4	21.7/	25.0	73.2/	77.4	80/	80	74/	78	293/296
	208/230-3-60	187	254	12.4		88.0	1.4	10.6	12.0/16.0	33.3/	38.5	87.7/	94.2	90/100		88/	94	305/310††
									18.6/24.8	51.6/	59.7	110.6/120.7		125/125		109/118		323/331††
090									24.0/32.0	66.6/	77.0	129.4/142.4		150/150		126/138		338/348††
									31.8/42.4	88.3/102.0		156.5/173.6		175/175		159/167		360/373††
(71/2 Tons)									—	—		22.8		25**		24		136
									13.9	16.7		43.7		45**		44		152
	460-3-60	414	508	6.4		44.0	0.7	4.8	16.5	19.8		47.5		50**		47		155
									27.8	33.4		64.5		70		63		169
									33.0	39.7		72.4		80		70		175
									41.7	50.2		85.5		90		82		186††
									—	—		49.2/ 49.2		50/ 50**		53/ 53		305/305
									7.8/10.4	21.7/	25.0	76.3/	80.4	80/	90	78/	81	327/330
	208/230-3-60	187	254	13.9		105	1.4	10.6	12.0/16.0	33.3/	38.5	90.8/	97.3	100/100		91/	97	339/344††
									18.6/24.8	51.6/	59.7	113.7/123.8		125/125		112/121		357/365††
102									24.0/32.0	66.6/	77.0	132.4/145.4		150/150		129/141		372/382††
									31.8/42.4	88.3/102.0		159.6/176.7		175/200		154/170		394/407††
(81/2 Tons)									—	—		25.9		30**		27		158
									13.9	16.7		46.7		50**		47		174
	460-3-60	414	508	7.9		55.0	0.7	4.8	16.5	19.8		50.6		60**		50		177
									27.8	33.4		67.6		70		66		191
									33.0	39.7		75.5		80		73		197
									41.7	50.2		88.6		90		85		208††
									—	—		66.0/ 66.0		70/ 70		70/ 70		365/365
									7.8/10.4	21.7/	25.0	93.2/	97.3	100/100		95/	99	387/390††
	208/230-3-60	187	254	19.3		123.0	1.4	15.0	12.0/16.0	33.3/	38.5	107.7/114.2		110/125		109/115		398/403††
									24.0/32.0	66.6/	77.0	149.3/162.3		150/175		147/159		431/442††
120									31.8/42.4	88.3/102.0		176.4/193.5		200/200		172/188		453/467††
									37.5/50.0	104.4/120.3		196.5/186.3		200/200		190/209		469/485††
(10 Tons)									—	—		33.5		35**		36		183
									16.5	19.8		58.2		60**		58		203
	460-3-60	414	508	10.0		62.0	0.7	7.4	27.8	33.4		75.2		80		74		217
									33.0	39.7		83.1		90		81		223††
									41.7	50.2		96.2		100		93		234††
									50.0	60.1		93.6		100		105		243††

549B, 549C

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

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

†Heaters are field installed only. **Fuse or HACR circuit breaker.

††Electrical disconnect cannot be used if electric heater is installed.

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.

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 percentage of 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

= 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.

% Voltage Imbalance= 100 x	7
	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%, con- tact 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	0.68	N/A	15
CRPWREXH022A01	3.4	N/A	1.32	15
CRPWREXH023A01	N/A	1.4	N/A	15
CRPWREXH028A01	1.7	N/A	0.68	15
CRPWREXH029A01	N/A	0.7	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 549B060 unit with MCA = 35.6 and MOCP = 40, with CRPWREXH030A01 power exhaust.

MCA New = 35.6 amps + 1.6 amps = 37.2 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. In all cases, the MOCP for the power exhaust should be 15 amps per NEC.

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