Bryant 120 instruction manual level, 312A

312A

Table 16 – Orifice Size and Manifold Pressure for Gas Input Rate

(Tabulated Data Based on 21,000 Btuh High-Heat/14,500 Btuh for Low-Heat Per Burner, Derated 4% for Each 1000 Ft Above Sea

level)

			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE					0.58			0.60			0.62			0.64
			HEAT VALUE
	(FT)
			(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			900	42		3.2/1.5	42		3.3/1.6	42		3.4/1.6	42		3.5/1.7
			925	43		3.7/1.8	43		3.8/1.8	42		3.2/1.5	42		3.3/1.6
			950	43		3.5/1.7	43		3.6/1.7	43		3.7/1.8	43		3.8/1.8
U.S.A.		0 to	975	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.7/1.7
and			1000	44		3.6/1.7	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
		2000
Canada
			1025	44		3.4/1.6	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6
			1050	44		3.3/1.6	44		3.4/1.6	44		3.5/1.7	43		3.2/1.5
			1075	45		3.8/1.8	44		3.2/1.5	44		3.3/1.6	44		3.4/1.6
			1100	46		3.8/1.8	45		3.7/1.8	44		3.2/1.5	44		3.3/1.6
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE					0.58			0.60			0.62			0.64
			HEAT VALUE
	(FT)
			(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
		U.S.A.	800	43		3.8/1.8	42		3.2/1.5	42		3.3/1.6	42		3.4/1.6
			825	43		3.5/1.7	43		3.7/1.7	43		3.8/1.8	42		3.2/1.5
		Altitudes
			850	43		3.3/1.6	43		3.5/1.6	43		3.6/1.7	43		3.7/1.8
		2001 to
U.S.A.			875	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
		3000 or
and			900	44		3.4/1.6	44		3.5/1.7	43		3.2/1.5	43		3.3/1.6
		Canada
Canada
			925	44		3.2/1.5	44		3.3/1.6	44		3.5/1.6	44		3.6/1.7
		Altitudes
		2001 to	950	45		3.7/1.8	45		3.8/1.8	44		3.3/1.6	44		3.4/1.6
		4500	975	46		3.7/1.8	46		3.8/1.8	45		3.8/1.8	44		3.2/1.5
			1000	46		3.5/1.7	46		3.6/1.7	46		3.8/1.8	45		3.7/1.8
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE					0.58			0.60			0.62			0.64
			HEAT VALUE
	(FT)		(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			775	43		3.5/1.7	43		3.7/1.7	43		3.8/1.8	42		3.2/1.5
			800	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.7/1.7
			825	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6
U.S.A.		3001 to	850	44		3.4/1.6	44		3.5/1.7	44		3.6/1.7	43		3.2/1.5
Only		4000	875	45		3.8/1.8	44		3.3/1.6	44		3.4/1.6	44		3.5/1.7
			900	46		3.8/1.8	45		3.8/1.8	44		3.2/1.5	44		3.3/1.6
			925	46		3.6/1.7	46		3.7/1.8	45		3.7/1.8	45		3.8/1.8
			950	46		3.4/1.6	46		3.5/1.7	46		3.7/1.7	46		3.8/1.8
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE					0.58			0.60			0.62			0.64
			HEAT VALUE
	(FT)
			(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			750	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.6/1.7
			775	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6
			800	44		3.3/1.6	44		3.4/1.6	44		3.6/1.7	43		3.2/1.5
U.S.A.		4001 to	825	45		3.8/1.8	44		3.2/1.5	44		3.4/1.6	44		3.5/1.6
Only		5000	850	46		3.8/1.8	45		3.7/1.8	45		3.8/1.8	44		3.3/1.6
			875	46		3.5/1.7	46		3.7/1.7	46		3.8/1.8	45		3.7/1.8
			900	47		3.8/1.8	46		3.5/1.7	46		3.6/1.7	46		3.7/1.8
			925	47		3.6/1.7	47		3.7/1.8	47		3.8/1.8	46		3.5/1.7
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		AT ALTITUDE
				Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			725	44	3.5/1.7		43	3.2/1.5		43	3.3/1.6		43	3.4/1.6
			750	44	3.3/1.6		44	3.4/1.6		44	3.5/1.7		43	3.2/1.5
			775	45	3.7/1.8		44	3.2/1.5		44	3.3/1.6		44	3.4/1.6
U.S.A.		5001 to	800	46	3.7/1.8		46	3.8/1.8		45	3.8/1.8		44	3.2/1.5
Only	6000		825	46	3.5/1.7		46	3.6/1.7		46	3.7/1.8		46	3.8/1.8
			850	47	3.7/1.8		47	3.8/1.8		46	3.5/1.7		46	3.6/1.7
			875	47	3.5/1.7		47	3.6/1.7		47	3.7/1.8		46	3.4/1.6
			900	48	3.8/1.8		47	3.4/1.6		47	3.5/1.7		47	3.7/1.7

* Orifice numbers 43 are factory installed

44