Bryant 581A/B manual Fan Performance Using Accessory Power Exhaust 580F180-300, Rating

PERFORMANCE DATA (cont)

a50-4028

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.

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.

Fan Performance Using Accessory

Power Exhaust (580F180-300)

ALTITUDE COMPENSATION* —

580F180-300

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

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

ALTITUDE COMPENSATION — 580F180-300

(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

580F180-300

OUTDOOR SOUND POWER

UNIT	SOUND	A-WEIGHTED				OCTAVE BANDS
580F	RATING	(dB)	63	125	250	500	1000	2000	4000	8000
	(60 Hz)
180	88 dB	87.6	90.8	88.7	86.4	84.3	83.5	78.4	75.6	66.8
210	88 dB	87.8	90.8	88.7	86.4	84.3	83.5	78.4	75.6	66.8
240	94 dB	94.4	99.7	93.0	93.7	91.8	89.7	85.9	80.7	74.4
300	94 dB	94.1	98.7	92.3	93.8	90.9	89.6	85.9	80.3	74.3

LEGEND

Bels — Sound Levels (1 bel = 10 decibels)

NOTE: Indoor sound power is available in Bryant’s Electronic Catalog program (ECAT) for specific operating parameters.

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