Bryant 581A/B FAN RPM AT Motor Pulley SETTINGS* 580F036-073, Altitude COMPENSATION* 580F036-073

PERFORMANCE DATA (cont)

FAN RPM AT MOTOR PULLEY SETTINGS* — 580F036-073

UNIT 580F						MOTOR PULLEY TURNS OPEN
	0	1/2	1	11/2	2	21/2		3	31/2	4	41/2	5	51/2	6
036†	1045	1009	973	937	901	865		829	793	757	721	685	—	—
036**	1455	1423	1392	1360	1328	1297		1265	1233	1202	1170	1138	1107	1075
048†	1175	1135	1094	1054	1013	973		932	892	851	811	770	—	—
048**	1455	1423	1392	1360	1328	1297		1265	1233	1202	1170	1138	1107	1075
060†	1300	1266	1233	1200	1166	1133		1100	1066	1033	1000	966	933	900
060**	1685	1647	1608	1570	1531	1493		1454	1416	1377	1339	1300	—	—
072,073††	1460	1421	1382	1343	1304	1265		1226	1187	1148	1109	1070	—	—
072,073**	1685	1647	1608	1570	1531	1493		1454	1416	1377	1399	1300	—	—
*Approximate fan rpm shown.							**Indicates high-static motor and drive package.
†Indicates alternate motor and drive package.							††Indicates standard motor and drive package.

580F036-151

FAN RPM AT MOTOR PULLEY SETTINGS* — 580F090-151

UNIT 580F						MOTOR PULLEY TURNS OPEN
	0	1/2	1	11/2	2		21/2	3	31/2	4	41/2	5	51/2	6
090,091†	840	815	790	765	740		715	690	665	635	615	590	—	—
090,091**	935	910	885	860	835		810	785	760	735	710	685	—	—
090,091††	1080	1025	1007	988	970		952	933	915	897	878	860	—	—
103†	935	910	885	860	835		810	785	760	735	710	685	—	—
103††	1080	1025	1007	988	970		952	933	915	897	878	860	—	—
120,121†	935	910	885	860	835		810	785	760	735	710	685	—	—
120,121***	1085	1060	1035	1010	985		960	935	910	885	860	835	—	—
120,121††	1130	1112	1087	1062	1037		1012	987	962	937	912	887	862	830
150,151†	1080	1060	1035	1015	990		970	950	925	905	880	860	—	—
150,151***	1130	1112	1087	1062	1037		1012	987	962	937	912	887	862	830

*Approximate fan rpm shown.

†Indicates standard motor and drive package. **Indicates alternate drive package only.

††Indicates high-static motor and drive package.

***Indicates alternate motor and drive package.

ALTITUDE COMPENSATION* — 580F036-073

STANDARD UNITS

	74,000 AND 115,000 BTUH		150,000 BTUH
ELEVATION	NOMINAL INPUT		NOMINAL INPUT
(ft)	Natural Gas	Liquid Propane	Natural Gas	Liquid Propane
	Orifice Size†	Orifice Size†	Orifice Size†	Orifice Size†
0-2,000	33	43	30	37
2,000	36	44	31	39
3,000	36	45	31	40
4,000	37	45	32	41
5,000	38	46	32	42
6,000	40	47	34	43
7,000	41	48	35	43
8,000	42	49	36	44
9,000	43	50	37	45
10,000	44	50	39	46
11,000	45	51	41	47
12,000	46	52	42	48
13,000	47	52	43	49
14,000	48	53	44	50

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes.

†Orifices available through your local Bryant distributor.

ALTITUDE COMPENSATION* — 580F036-073

LOW NOx UNITS

ELEVATION	60,000 AND 90,000 BTUH	120,000 BTUH
	NOMINAL INPUT	NOMINAL INPUT
(ft)
	Natural Gas Orifice Size†	Natural Gas Orifice Size
0-2,000	38	32
2,000	40	33
3,000	41	35
4,000	42	36
5,000	43	37
6,000	43	38
7,000	44	39
8,000	45	41
9,000	46	42
10,000	47	43
11,000	48	44
12,000	49	44
13,000	50	46
14,000	51	47

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, the input rate should be reduced at higher altitudes.

†Orifices are available through your local Bryant distributor.

ALTITUDE COMPENSATION* — 580F090-151

	125,000,180,000, AND 224,000		250,000 BTUH
ELEVATION	BTUH NOMINAL INPUT		NOMINAL INPUT
(ft)	Natural Gas	Liquid Propane	Natural Gas	Liquid Propane
	Orifice Size†	Orifice Size†	Orifice Size†	Orifice Size†
0-2,000	31	41	30	38
2,000	32	42	30	39
3,000	32	42	31	40
4,000	32	42	32	41
5,000	33	43	33	42
6,000	34	43	34	43
7,000	35	44	35	43
8,000	36	44	36	44
9,000	37	45	37	44
10,000	38	46	38	45
11,000	39	47	39	45
12,000	40	47	40	46
13,000	41	48	41	47
14,000	42	48	42	47

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes.

†Orifices available through your local Bryant distributor.

ALTITUDE DERATING FACTOR*

ELEVATION	MAXIMUM HEATING VALUE
(ft)	(Btu/ft3)
0-2,000	1,100
2,001-3,000	1,050
3,001-4,000	1,000
4,001-5,000	950
5,001-6,000	900

*Derating of the unit is not required unless the heating value of the gas exceeds the val- ues listed in the table above, or if the elevation exceeds 6000 ft. Derating conditions must be 4% per thousand ft above 2000 ft. For example, at 4000 ft, if the heating value of the gas exceeds 1000 Btu/ft3, the unit will require a 16% derating. For elevations above 6000 ft, the same formula applies. For example, at 7000 ft, the unit will require a 28% derating of the maximum heating value per the National Fuel Gas Code.

IMPORTANT: Local utility companies may be reducing heat content of gas at altitudes above 2000 ft. If this is being done, changing spuds may not be required.

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