Bryant manual Altitude Compensation, Altitude Derating Factor, 581B036-150

	PERFORMANCE DATA (cont)
ALTITUDE COMPENSATION*	ALTITUDE COMPENSATION*
581B036-072	581B090-150

	72,000 AND 115,000/
	60,000 and 90,000		150,000/120,000 BTUH
ELEVATIO	BTUH NOMINAL		NOMINAL INPUT
	INPUT*
N
(ft)	Natural	Liquid	Natural	Liquid
	Gas	Propane	Gas	Propane
	Orifice	Orifice	Orifice	Orifice
	Size†	Size†	Size†	Size†
0-2,000	33/38	43/45	30/32	38/42
2,000	34/39	43/46	30/33	39/42
3,000	35/40	44/47	31/34	40/43
4,000	36/41	44/47	32/35	41/43
5,000	36/41	44/48	33/35	42/43
6,000	37/42	45/48	34/36	43/44
7,000	37/42	45/49	35/37	43/44
8,000	38/43	46/49	36/37	44/45
9,000	39/43	47/50	37/38	44/46
10,000	41/44	48/50	38/40	45/47
11,000	43/45	48/51	39/41	45/48
12,000	44/45	49/51	40/42	46/49
13,000	44/46	49/52	41/43	47/49
14,000	45/47	50/52	42/43	47/50

*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 Bryant distributor.

	125,000-224,000 BTUH		250,000 BTUH
ELEVATION	NOMINAL INPUT		NOMINAL INPUT
	Natural	Liquid	Natural	Liquid
(ft)	Gas	Propane	Gas	Propane
	Orifice	Orifice	Orifice	Orifice
	Size†	Size†	Size†	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*

581B036-150

ELEVATION	MAXIMUM HEATING VALUE
	(Btu/ft3)
0-2000	1100
2001-3000	1050
3001-4000	1000
4001-5000	950
5001-6000	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 sea level. 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.

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