Carrier 58TMA operating instructions Derated 4% for Each 1000 Ft Above Sea Level

Table 10—Model 58TMA Orifice Size and Manifold Pressure for Correct Input

(Tabulated Data Based on 21,000 Btuh High Heat/13,500 Btuh Low Heat per Burner,

Derated 4% for Each 1000 Ft Above Sea Level)*

			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
	ALTITUDE				0.58			0.60			0.62			0.64			0.66
			HEAT VALUE
		RANGE	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
		(FT)				Pressure			Pressure			Pressure			Pressure			Pressure
			(BTU/CU FT)	No.			No.			No.			No.			No.
						High/Low			High/Low			High/Low			High/Low			High/Low
			850	42		3.3/1.4	42		3.4/1.4	42		3.5/1.5	42		3.7/1.5	42		3.8/1.6
			875	43		3.8/1.6	42		3.2/1.3	42		3.3/1.4	42		3.5/1.4	42		3.6/1.5
Canada			900	43		3.6/1.5	43		3.7/1.5	42		3.2/1.3	42		3.3/1.3	42		3.4/1.4
		0	925	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5	43		3.8/1.6	42		3.2/1.3
			950	44		3.7/1.5	44		3.8/1.6	43		3.5/1.4	43		3.6/1.5	43		3.7/1.5
and		to	975	44		3.5/1.5	44		3.6/1.5	44		3.8/1.6	43		3.4/1.4	43		3.5/1.4
			1000	44		3.3/1.4	44		3.5/1.4	44		3.6/1.5	44		3.7/1.5	44		3.8/1.6
U.S.A.
		2000	1025	44		3.2/1.3	44		3.3/1.4	44		3.4/1.4	44		3.5/1.5	44		3.6/1.5
			1050	45		3.7/1.5	45		3.8/1.6	44		3.2/1.3	44		3.4/1.4	44		3.5/1.4
			1075	46		3.7/1.5	46		3.8/1.6	45		3.7/1.5	44		3.2/1.3	44		3.3/1.4
			1100	46		3.5/1.5	46		3.6/1.5	46		3.8/1.6	45		3.7/1.5	45		3.8/1.6
			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
	ALTITUDE				0.58			0.60			0.62			0.64			0.66
			HEAT VALUE
		RANGE
			AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
		(FT)				Pressure			Pressure			Pressure			Pressure			Pressure
			(BTU/CU FT)	No.			No.			No.			No.			No.
						High/Low			High/Low			High/Low			High/Low			High/Low
		U.S.A.	775	43		3.7/1.5	42		3.2/1.3	42		3.3/1.4	42		3.4/1.4	42		3.5/1.4
		Altitudes	800	43		3.5/1.4	43		3.6/1.5	43		3.7/1.5	42		3.2/1.3	42		3.3/1.3
Canada		2001	825	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5	43		3.7/1.5
		to	850	44		3.6/1.5	44		3.7/1.5	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5
		3000	875	44		3.4/1.4	44		3.5/1.4	44		3.6/1.5	44		3.7/1.5	44		3.8/1.6
and		or	900	44		3.2/1.3	44		3.3/1.4	44		3.4/1.4	44		3.5/1.4	44		3.6/1.5
		Canada	925	46		3.8/1.6	45		3.8/1.6	44		3.2/1.3	44		3.3/1.4	44		3.4/1.4
U.S.A.
		Altitudes	950	46		3.6/1.5	46		3.7/1.5	45		3.7/1.5	45		3.8/1.6	44		3.2/1.3
		2000	975	46		3.4/1.4	46		3.5/1.5	46		3.7/1.5	46		3.8/1.6	45		3.7/1.5
		to	1000	47		3.7/1.5	47		3.8/1.6	46		3.5/1.4	46		3.6/1.5	46		3.7/1.5
		4500	1025	47		3.5/1.5	47		3.6/1.5	47		3.8/1.6	46		3.4/1.4	46		3.5/1.5
			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
	ALTITUDE				0.58			0.60			0.62			0.64			0.66
			HEAT VALUE
		RANGE
			AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
		(FT)				Pressure			Pressure			Pressure			Pressure			Pressure
			(BTU/CU FT)	No.			No.			No.			No.			No.
						High/Low			High/Low			High/Low			High/Low			High/Low
			750	43		3.5/1.4	43		3.6/1.5	43		3.7/1.5	42		3.2/1.3	42		3.3/1.4
			775	44		3.8/1.6	43		3.4/1.4	43		3.5/1.4	43		3.6/1.5	43		3.7/1.5
			800	44		3.5/1.5	44		3.7/1.5	44		3.8/1.6	43		3.4/1.4	43		3.5/1.4
Only		3001	825	44		3.3/1.4	44		3.4/1.4	44		3.5/1.5	44		3.7/1.5	44		3.8/1.6
			850	45		3.8/1.6	44		3.2/1.3	44		3.3/1.4	44		3.4/1.4	44		3.6/1.5
U.S.A.		to	875	46		3.7/1.5	45		3.7/1.5	44		3.2/1.3	44		3.3/1.3	44		3.4/1.4
			900	46		3.5/1.5	46		3.7/1.5	46		3.8/1.6	45		3.7/1.5	44		3.2/1.3
		4000	925	47		3.8/1.6	46		3.5/1.4	46		3.6/1.5	46		3.7/1.5	46		3.8/1.6
			950	47		3.6/1.5	47		3.7/1.5	46		3.4/1.4	46		3.5/1.5	46		3.6/1.5
			975	47		3.4/1.4	47		3.5/1.5	47		3.7/1.5	47		3.8/1.6	46		3.4/1.4
			1000	48		3.7/1.5	48		3.8/1.6	47		3.5/1.4	47		3.6/1.5	47		3.7/1.5

*For 125-20 size only, input is 20,500 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in. wc.

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