Bryant 120 instruction manual Level, 312A

312A

Table 15 – Orifice Size and Manifold Pressure for Gas Input Rate

(Tabulated Data Based on 22,000 Btuh High-Heat/14,500 Btuh for Low-Heat per Burner, Derated 4% for Each 1000 Ft Above Sea

Level)

ALTITUDE RANGE			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		(BTUH/CU	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			900	42		3.5/1.5	42		3.6/1.6	42		3.7/1.6	41		3.5/1.5
			925	42		3.3/1.4	42		3.4/1.5	42		3.5/1.5	42		3.7/1.6
			950	43		3.8/1.7	42		3.3/1.4	42		3.4/1.5	42		3.5/1.5
U.S.A.			975	43		3.6/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
and		0 to 2000	1000	43		3.5/1.5	43		3.6/1.6	43		3.7/1.6	43		3.8/1.7
Canada			1025	43		3.3/1.4	43		3.4/1.5	43		3.5/1.5	43		3.6/1.6
			1050	44		3.6/1.6	43		3.2/1.4	43		3.4/1.5	43		3.5/1.5
			1075	44		3.4/1.5	44		3.5/1.5	43		3.2/1.4	43		3.3/1.4
			1100	44		3.3/1.4	44		3.4/1.5	44		3.5/1.5	43		3.2/1.4
			AVG. GAS				SPECIFIC		GRAVITY	OF NATURAL GAS
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		(BTUH/CU
				Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
		U.S.A.	800	42		3.4/1.5	42		3.5/1.5	42		3.6/1.6	42		3.7/1.6
			825	42		3.2/1.4	42		3.3/1.4	42		3.4/1.5	42		3.5/1.5
		Altitudes
			850	43		3.7/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
		2001 to
U.S.A.			875	43		3.5/1.5	43		3.6/1.6	43		3.7/1.6	43		3.8/1.7
		3000 or
and			900	43		3.3/1.4	43		3.4/1.5	43		3.5/1.5	43		3.6/1.6
		Canada
Canada
			925	44		3.5/1.5	43		3.2/1.4	43		3.3/1.4	43		3.4/1.5
		Altitudes
		2001 to	950	44		3.4/1.5	44		3.5/1.5	44		3.6/1.6	43		3.2/1.4
		4500	975	44		3.2/1.4	44		3.3/1.4	44		3.4/1.5	44		3.5/1.5
			1000	45		3.7/1.6	45		3.8/1.7	44		3.2/1.4	44		3.4/1.5
			AVG. GAS				SPECIFIC		GRAVITY	OF NATURAL GAS
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		(BTUH/CU	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			775	42		3.2/1.4	42		3.3/1.4	42		3.4/1.5	42		3.5/1.5
			800	43		3.6/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
			825	43		3.4/1.5	43		3.5/1.5	43		3.7/1.6	43		3.8/1.6
U.S.A.		3001 to	850	43		3.2/1.4	43		3.3/1.4	43		3.4/1.5	43		3.6/1.5
Only		4000	875	44		3.5/1.5	44		3.6/1.6	43		3.3/1.4	43		3.4/1.5
			900	44		3.3/1.4	44		3.4/1.5	44		3.5/1.5	43		3.2/1.4
			925	45		3.8/1.6	44		3.2/1.4	44		3.3/1.5	44		3.4/1.5
			950	46		3.8/1.6	45		3.7/1.6	45		3.8/1.7	44		3.3/1.4
			AVG. GAS				SPECIFIC		GRAVITY	OF NATURAL GAS
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		(BTUH/CU
				Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			750	43		3.6/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
			775	43		3.4/1.5	43		3.5/1.5	43		3.6/1.6	43		3.8/1.6
			800	43		3.2/1.4	43		3.3/1.4	43		3.4/1.5	43		3.5/1.5
U.S.A.		4001 to	825	44		3.4/1.5	44		3.6/1.5	43		3.2/1.4	43		3.3/1.4
Only		5000	850	44		3.2/1.4	44		3.4/1.5	44		3.5/1.5	44		3.6/1.6
			875	45		3.7/1.6	45		3.8/1.7	44		3.3/1.4	44		3.4/1.5
			900	46		3.7/1.6	46		3.8/1.7	45		3.7/1.6	44		3.2/1.4
			925	46		3.5/1.5	46		3.6/1.6	46		3.7/1.6	46		3.8/1.7
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE
ALTITUDE RANGE					0.58			0.60			0.62			0.64
			AT ALTITUDE
	(FT)
			(BTUH/CU	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			725	43	3.4/1.5		43	3.5/1.5		43	3.6/1.6		43	3.7/1.6
			750	43	3.2/1.4		43	3.3/1.4		43	3.4/1.5		43	3.5/1.5
			775	44	3.4/1.5		44	3.5/1.5		43	3.2/1.4		43	3.3/1.4
U.S.A.		5001 to	800	44	3.2/1.4		44	3.3/1.4		44	3.4/1.5		44	3.5/1.5
Only	6000		825	46	3.8/1.7		45	3.8/1.6		44	3.2/1.4		44	3.3/1.4
			850	46	3.6/1.6		46	3.7/1.6		46	3.8/1.7		45	3.8/1.6
			875	47	3.8/1.7		46	3.5/1.5		46	3.6/1.6		46	3.7/1.6
			900	47	3.6/1.6		47	3.8/1.6		46	3.4/1.5		46	3.5/1.5

* Orifice numbers 43 are factory installed

42