Bryant 581A/B manual Altitude COMPENSATION* 581A155,180, Altitude Compensation 581A210-300

PERFORMANCE DATA (cont)

a50-4028

Fan Performance Using Accessory

Power Exhaust (581A155,180)

ALTITUDE COMPENSATION* — 581A155,180

(Natural Gas Units)

ELEVATION		NATURAL GAS ORIFICE SIZE†
(ft)		Low Heat	High Heat
0-3,000		30	29
3,000-	7,000	31	30
7,000-	9,000	32	31
9,000-10,000		33	31
above 10,000		35	32

ALTITUDE COMPENSATION — 581A210-300

(LP Gas)

ELEVATION		ORIFICE SIZE — LP GAS
(ft)	Low	Medium	High Heat	High Heat
	Heat	Heat	(6 Cell)	(8 Cell)
0-2,000	35	38	35	35
2,000	36	39	36	36
3,000	36	39	36	36
4,000	37	40	37	37
5,000	37	40	37	37
6,000	38	41	38	38
7,000	39	42	39	39
8,000	40	43	40	40
9,000	41	44	41	41
above 10,000	42	45	42	42

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 values 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.

*Includes a 4% input reduction per each 1,000 feet. †Orifices available through your Bryant dealer.

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.

ALTITUDE COMPENSATION — 581A155,180

(LP Gas Units)

ELEVATION	LIQUID PROPANE ORIFICE SIZE
(ft)	Low Heat and High Heat
0-2,000	36
2,000	37
3,000	38
4,000	38
5,000	39
6,000	40
7,000	41
8,000	41
9,000	42
10,000	43

EVAPORATOR-FAN MOTOR EFFICIENCY —

581A155,180

MOTOR	MOTOR EFFICIENCY
HORSEPOWER	(%)
3.0	81.7
2.9, 3.7	85.8
5.0	87.5

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

ALTITUDE COMPENSATION — 581A210-300

(Natural Gas)

	ELEVATION		ORIFICE SIZE — NATURAL GAS
300	(ft)	Low		Medium	High Heat	High Heat
		Heat		Heat	(6 Cell)	(8 Cell)
581A155-	0-2,000	29		30	29	29
	2,000	29		30	29	29
	3,000	30		31	30	30
	4,000	30		31	30	30
	5,000	30		31	30	30
	6,000	30		31	30	30
	7,000	31		32	31	31
	8,000	31		32	31	31
	9,000	31		32	31	31
	above 10,000	32		33	32	32

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