Bryant 355MAV instruction manual United States

Table 13—Model 355MAV Orifice Size and Manifold Pressure for Correct Input (Continued)

(Tabulated Data Based on 20,000 Btuh High Heat/13,000 Btuh Low Heat per Burner, Derated 2 Percent for Each 1000 ft Above

Sea Level)

ALTITUDE			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
					0.58			0.60			0.62			0.64			0.66
	RANGE		HEAT VALUE
	(FT)		(BTU/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure
			725	43		3.7/1.5	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4	42		3.4/1.4
Canada			750	44		3.4/1.4	43		3.5/1.5	43		3.7/1.5	43		3.8/1.6	42		3.2/1.4
			775	44		3.7/1.6	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5	43		3.7/1.5
		4001	800	44		3.5/1.5	44		3.6/1.5	44		3.7/1.6	44		3.8/1.6	43		3.4/1.4
			825	44		3.2/1.4	44		3.4/1.4	44		3.5/1.5	44		3.6/1.5	44		3.7/1.6
and
		to
			850	45		3.7/1.6	45		3.8/1.6	44		3.3/1.4	44		3.4/1.4	44		3.5/1.5
		5000
U.S.A.			875	45		3.5/1.5	45		3.6/1.5	45		3.7/1.6	44		3.2/1.3	44		3.3/1.4
			900	45		3.3/1.4	45		3.4/1.4	45		3.5/1.5	45		3.6/1.5	45		3.8/1.6
			925	47		3.7/1.6	45		3.2/1.4	45		3.3/1.4	45		3.4/1.5	45		3.6/1.5
			950	47		3.5/1.5	47		3.6/1.5	45		3.2/1.3	45		3.3/1.4	45		3.4/1.4
ALTITUDE			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
					0.58			0.60			0.62			0.64			0.66
	RANGE		HEAT VALUE
	(FT)		(BTU/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure
			700	43		3.6/1.5	43		3.7/1.6	42		3.2/1.3	42		3.3/1.4	42		3.4/1.4
			725	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5	43		3.7/1.6	43		3.8/1.6
			750	44		3.6/1.5	44		3.7/1.6	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5
Canada			775	44		3.4/1.4	44		3.5/1.5	44		3.6/1.5	44		3.7/1.6	43		3.4/1.4
			800	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
		5001	825	45		3.6/1.5	45		3.7/1.6	44		3.2/1.4	44		3.3/1.4	44		3.4/1.4
and		to	850	45		3.4/1.4	45		3.5/1.5	45		3.6/1.5	45		3.8/1.6	44		3.2/1.4
		6000	875	45		3.2/1.4	45		3.3/1.4	45		3.4/1.5	45		3.6/1.5	45		3.7/1.5
U.S.A.
			900	47		3.6/1.5	47		3.7/1.6	45		3.3/1.4	45		3.4/1.4	45		3.5/1.5
			925	47		3.4/1.4	47		3.5/1.5	47		3.7/1.5	45		3.2/1.3	45		3.3/1.4
			950	48		3.7/1.6	48		3.8/1.6	47		3.5/1.5	47		3.6/1.5	47		3.7/1.6
			975	48		3.5/1.5	48		3.6/1.5	48		3.8/1.6	47		3.4/1.4	47		3.5/1.5
			1000	48		3.3/1.4	48		3.5/1.5	48		3.6/1.5	48		3.7/1.6	48		3.8/1.6
ALTITUDE			AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
					0.58			0.60			0.62			0.64			0.66
	RANGE		HEAT VALUE
	(FT)		(BTU/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
				no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure	no.		Pressure
			650	42		3.2/1.3	42		3.3/1.4	42		3.4/1.4	42		3.5/1.5	42		3.6/1.5
			675	43		3.6/1.5	43		3.7/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
			700	44		3.8/1.6	43		3.4/1.5	43		3.6/1.5	43		3.7/1.6	43		3.8/1.6
Only		6001	725	44		3.6/1.5	44		3.7/1.6	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5
			750	44		3.3/1.4	44		3.4/1.5	44		3.6/1.5	44		3.7/1.6	44		3.8/1.6
U.S.A.		to
			775	45		3.8/1.6	44		3.2/1.4	44		3.3/1.4	44		3.4/1.5	44		3.5/1.5
		7000
			800	45		3.5/1.5	45		3.7/1.5	45		3.8/1.6	44		3.2/1.4	44		3.3/1.4
			825	45		3.3/1.4	45		3.4/1.5	45		3.6/1.5	45		3.7/1.6	45		3.8/1.6
			850	47		3.7/1.6	45		3.2/1.4	45		3.4/1.4	45		3.5/1.5	45		3.6/1.5
			875	47		3.5/1.5	47		3.6/1.5	45		3.2/1.3	45		3.3/1.4	45		3.4/1.4

*Orifice numbers 45 are factory installed.

j.Remove jumpers R to W/W1 and R to W2.

3. Verify natural gas input rate by clocking gas meter.

NOTE: Be sure all pressure tubing, combustion-air and vent pipes, and burner enclosure front are in place when checking input by clocking gas meter.

a. Calculate high-altitude adjustment (if required).

CAUTION: DO NOT redrill orifices. Improper drilling (burrs, out-of-round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of burners and heat exchangers, causing failures. (See Fig. 57.)

UNITED STATES

At altitudes above 2000 ft, this furnace has been approved for a 2 percent derate for each 1000 ft above sea level. See Example and Table 14 for derate multiplier factor.

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