Carrier 58ZAV operating instructions Altitude

→Table 7ÐModel 58ZAV Orifice Size² and Manifold Pressure for Correct Input

(Tabulated Data Based on 23,000 BTUH Per Burner, Derated 4 Percent per 1000 Ft Above Sea Level)*

	ALTITUDE		AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64			0.66
		RANGE
		(FT)	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTU/CU FT)
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			850	41		3.6	41		3.7	41		3.8	40		3.6	40		3.8
			875	42		3.8	41		3.5	41		3.6	41		3.7	41		3.8
Canada			900	42		3.5	42		3.7	42		3.8	41		3.5	41		3.6
		0	925	42		3.4	42		3.5	42		3.6	42		3.7	42		3.8
			950	42		3.2	42		3.3	42		3.4	42		3.5	42		3.6
and		to	975	43		3.7	43		3.8	42		3.2	42		3.3	42		3.4
			1000	43		3.5	43		3.6	43		3.7	42		3.2	42		3.3
U.S.A.
		2000	1025	43		3.3	43		3.4	43		3.6	43		3.7	43		3.8
			1050	43		3.2	43		3.3	43		3.4	43		3.5	43		3.6
			1075	44		3.5	44		3.6	43		3.2	43		3.3	43		3.4
			1100	44		3.3	44		3.4	44		3.5	43		3.2	43		3.3
	ALTITUDE		AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64			0.66
		RANGE
		(FT)	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTU/CU FT)
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
		U.S.A	775	42		3.7	42		3.8	41		3.5	41		3.6	41		3.8
		Altitudes	800	42		3.4	42		3.6	42		3.7	42		3.8	41		3.5
Canada		2001	825	42		3.2	42		3.3	42		3.5	42		3.6	42		3.7
		to	850	43		3.7	43		3.8	42		3.3	42		3.4	42		3.5
		3000	875	43		3.5	43		3.6	43		3.7	42		3.2	42		3.3
and		or	900	43		3.3	43		3.4	43		3.5	43		3.7	43		3.8
		Canada	925	43		3.1	43		3.2	43		3.4	43		3.5	43		3.6
U.S.A.
		Altitudes	950	43		3.0	43		3.1	43		3.2	43		3.3	43		3.4
		2000	975	43		2.8	43		2.9	43		3.0	43		3.1	43		3.2
		to	1000	43		2.7	43		2.8	43		2.9	43		3.0	43		3.1
		4500	1025	43		2.6	43		2.6	43		2.7	43		2.8	43		2.9
	ALTITUDE		AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64			0.66
		RANGE
		(FT)	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTU/CU FT)
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			750	42		3.4	42		3.6	42		3.7	42		3.8	41		3.5
			775	42		3.2	42		3.3	42		3.5	42		3.6	42		3.7
			800	43		3.7	43		3.8	42		3.2	42		3.3	42		3.4
Only		3001	825	43		3.5	43		3.6	43		3.7	43		3.8	42		3.2
			850	43		3.3	43		3.4	43		3.5	43		3.6	43		3.7
		to	875	43		3.1	43		3.2	43		3.3	43		3.4	43		3.5
U.S.A.
			900	43		2.9	43		3.0	43		3.1	43		3.2	43		3.3
		4000	925	43		2.8	43		2.9	43		3.0	43		3.0	43		3.1
			950	43		2.6	43		2.7	43		2.8	43		2.9	43		3.0
			975	43		2.5	43		2.6	43		2.7	43		2.7	43		2.8
			1000	43		2.4	43		2.4	43		2.5	43		2.6	43		2.7
	ALTITUDE		AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64			0.66
		RANGE
		(FT)	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTU/CU FT)
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			725	42		3.2	42		3.3	42		3.5	42		3.6	42		3.7
			750	43		3.7	43		3.8	42		3.2	42		3.3	42		3.4
Only			775	43		3.4	43		3.6	43		3.7	43		3.8	42		3.2
		4001	800	43		3.2	43		3.3	43		3.5	43		3.6	43		3.7
			825	43		3.0	43		3.1	43		3.2	43		3.4	43		3.5
U.S.A.
		to	850	43		2.9	43		3.0	43		3.1	43		3.2	43		3.3
			875	43		2.7	43		2.8	43		2.9	43		3.0	43		3.1
		5000	900	43		2.6	43		2.6	43		2.7	43		2.8	43		2.9
			925	43		2.4	43		2.5	43		2.6	43		2.7	43		2.8
			950	43		2.3	43		2.4	43		2.5	43		2.5	43		2.6

*For size 135-20 only, input is 22,500 Btuh per burner. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in. wc on altitudes up to 2000 ft, otherwise change orifice size if manifold pressure falls below 2.0-in. wc.

² Orifices sizes shown in BOLD are factory installed.

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