Alliance Laundry Systems T477C High Altitude Burner Orifice Sizing

Gas Requirements

High Altitude Burner Orifice Sizing

For proper operation at altitudes above 2000 feet (610 meters), the gas burner orifice size must be reduced to ensure complete combustion. Refer to Table 8.

For CE models, consult local gas supplier.

		Altitude					Burner Orifice			New Rate
Model	Gas
		Feet	Meters		No.	Inches	mm	Quantity	Part	(Btu/hr.)*
									Number
T30	Natural Gas	2001-4000	610-1220		22	0.1570	4.0		M402996	134,320
		4001-6000	1221-1830		24	0.1520	3.9		M402980	122,640
		6001-8000	1831-2440		26	0.1470	3.7		M401000	110,960
		8001-10,000	2441-3050		28	0.1405	3.6	2	M401014	99,280
	L.P. Gas	2001-6000	610-1830		42	0.0935	2.4		M403017	134,320
		6001-8000	1831-2440		43	0.0890	2.3		M406184	110,960
		8001-10,000	2441-3050		44	0.0860	2.2		M401011	99,280
T45	Natural Gas	2001 – 4000	610	– 1220	15	0.1800	4.6		M411511	183,000
		4001 – 6000	1221	– 1830	17	0.1730	4.4		M411374	168,400
		6001 – 8000	1831	– 2440	18	0.1695	4.3		M402988	155,000
		8001 – 10000	2441	– 3050	20	0.1610	4.1	2	M401002	142,600
	L.P. Gas	2001 – 4000	610	– 1220	36	0.1065	2.7		M402487	183,000
		4001 – 6000	1221	– 1830	37	0.1040	2.6		M411375	168,400
		6001 – 8000	1831	– 2440	38	0.1015	2.6		M411376	155,000
		8001 – 10000	2441	– 3050	40	0.0980	2.5		M406361	142,600

* Btu/hr. derate of 4% per 1000 feet (305 meters) of altitude.

Table 8

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