Bryant 549C manual Nominal Voltage Compressor OFM Minimum Unit

ELECTRICAL DATA — 549B (cont)

549B036-120 — STANDARD 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
									—	—		43.0/ 43.0		45/ 45**		46/ 46		247/247
									7.8/10.4	21.7/	25.0	70.1/	74.3	80/	80	71/	75	269/272
	208/230-3-60	187	254	12.4		88.0	1.4	7.5	12.0/16.0	33.3/	38.5	84.6/	91.1	90/100		84/	90	280/285††
									18.6/24.8	51.6/	59.7	107.5/117.6		110/125		105/115		298/307††
090									24.0/32.0	66.6/	77.0	126.3/139.3		150/150		122/134		313/324††
									31.8/42.4	88.3/102.0		153.4/170.5		175/175		147/163		335/349††
(71/2 Tons)									—	—		21.4		25**		23		123
									13.9	16.7		42.3		45**		42		140
	460-3-60	414	508	6.4		44.0	0.7	3.4	16.5	19.8		46.1		50**		46		143
									27.8	33.4		63.1		70		61		157
									33.0	39.7		71.0		80		68		163
									41.7	50.2		84.1		90		80		174
									—	—		46.1/ 46.1		50/ 50**		49/ 49		281/281
									7.8/10.4	21.7/	25.0	73.2/	77.3	80/	80	74/	78	303/306
	208/230-3-60	187	254	13.9		105	1.4	7.5	12.0/16.0	33.3/	38.5	87.7/	94.2	90/100		87/	93	314/319††
									18.6/24.8	51.6/	59.7	110.6/120.7		125/125		108/118		332/341††
102									24.0/32.0	66.6/	77.0	129.3/142.3		150/150		126/138		347/358††
									31.8/42.4	88.3/102.0		156.5/173.6		175/175		151/166		369/383††
(81/2 Tons)									—	—		24.5		25**		26		145
									13.9	16.7		45.3		50**		45		162
	460-3-60	414	508	7.9		55.0	0.7	3.4	16.5	19.8		49.2		50**		49		165
									27.8	33.4		66.2		70		64		179
									33.0	39.7		74.1		80		72		185
									41.7	50.2		87.2		90		84		196
									—	—		61.6/ 61.6		70/ 70		65/ 65		341/341
									7.8/10.4	21.7/	25.0	88.8/	92.9	90/100		90/	94	363/366††
	208/230-3-60	187	254	19.3		123.0	1.4	10.6	12.0/16.0	33.3/	38.5	103.3/109.8		110/110		104/110		375/380††
									24.0/32.0	66.6/	77.0	144.9/157.9		150/175		142/154		408/418††
120									31.8/42.4	88.3/102.0		172.0/189.1		175/200		167/183		430/443††
									37.6/50.0	104.4/120.3		192.1/181.9		200/200		185/204		446/462††
(10 Tons)									—	—		30.9		35**		33		172
									16.5	19.8		55.6		60**		55		191
	460-3-60	414	508	10.0		62.0	0.7	4.8	27.8	33.4		72.6		80		71		205
									33.0	39.7		80.5		90		78		211
									41.7	50.2		93.6		100		90		222††
									50.0	60.1		91.0		100		102		232††

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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