Bryant 355MAV instruction manual Sea Level, Canada

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
			625	43		3.8/1.6	42		3.3/1.4	42		3.4/1.4	42		3.5/1.5	42		3.6/1.5
			650	43		3.5/1.5	43		3.7/1.6	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
			675	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5	43		3.7/1.6
Only		7001	700	44		3.5/1.5	44		3.6/1.5	44		3.8/1.6	43		3.4/1.4	43		3.5/1.5
			725	44		3.3/1.4	44		3.4/1.4	44		3.5/1.5	44		3.6/1.5	44		3.7/1.6
U.S.A.		to
			750	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
		8000
			775	45		3.5/1.5	45		3.6/1.5	45		3.7/1.6	45		3.8/1.6	44		3.3/1.4
			800	45		3.3/1.4	45		3.4/1.4	45		3.5/1.5	45		3.6/1.5	45		3.7/1.6
			825	47		3.6/1.5	45		3.2/1.3	45		3.3/1.4	45		3.4/1.4	45		3.5/1.5
			850	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
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
			600	43		3.8/1.6	42		3.3/1.4	42		3.4/1.4	42		3.5/1.5	42		3.6/1.5
			625	43		3.5/1.5	43		3.6/1.5	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4
Only		Altitudes	650	44		3.7/1.6	43		3.4/1.4	43		3.5/1.5	43		3.6/1.5	43		3.7/1.6
			675	44		3.5/1.5	44		3.6/1.5	44		3.7/1.6	44		3.8/1.6	43		3.4/1.5
		8001
U.S.A.			700	44		3.2/1.4	44		3.3/1.4	44		3.4/1.5	44		3.6/1.5	44		3.7/1.6
		to
			725	45		3.6/1.5	45		3.8/1.6	44		3.2/1.4	44		3.3/1.4	44		3.4/1.4
		9000
			750	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
			775	45		3.2/1.3	45		3.3/1.4	45		3.4/1.4	45		3.5/1.5	45		3.6/1.5
			800	47		3.6/1.5	47		3.7/1.6	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
			575	43		3.8/1.6	42		3.2/1.4	42		3.3/1.4	42		3.5/1.5	42		3.6/1.5
			600	43		3.5/1.5	43		3.6/1.5	43		3.7/1.6	42		3.2/1.3	42		3.3/1.4
Only			625	44		3.7/1.6	44		3.8/1.6	43		3.5/1.5	43		3.6/1.5	43		3.7/1.6
		9001	650	44		3.4/1.4	44		3.5/1.5	44		3.7/1.5	44		3.8/1.6	43		3.4/1.4
U.S.A.		to	675	44		3.8/1.6	44		3.3/1.4	44		3.4/1.4	44		3.5/1.5	44		3.6/1.5
		10,000	700	45		3.6/1.5	45		3.7/1.6	45		3.8/1.6	44		3.3/1.4	44		3.4/1.4
			725	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
			750	47		3.7/1.6	45		3.2/1.4	45		3.3/1.4	45		3.4/1.5	45		3.5/1.5
			775	47		3.5/1.5	47		3.6/1.5	47		3.7/1.6	45		3.2/1.4	45		3.3/1.4

*Orifice numbers 45 are factory installed.

CANADA

At installation altitudes from 2000 to 4500 ft, this furnace must be derated 5 percent by an authorized Gas Conversion Station or Dealer. To determine correct input rate for altitude, see example above and use 0.95 as derate multiplier factor.

b. Reinstall burner box cover.

NOTE: Clocking gas input rate MUST always be performed with the burner box cover INSTALLED.

c.Check that gas valve adjustment caps are in place for proper input to be clocked.

d.Obtain yearly heat value average for local gas supply.

NOTE: Be sure heating value of gas used for calculations is correct for your altitude. Consult local gas utility for altitude adjustment of gas heating value.

e.Check and verify orifice size in furnace. NEVER ASSUME THE ORIFICE SIZE. ALWAYS CHECK AND VERIFY.

f.Turn off all other gas appliances and pilots.

g.Move setup switch SW-2 to ON position. (See Fig. 31.) This keeps furnace locked in low-heat operation.

h.Jumper R to W/W1.

i.Let furnace run for 3 minutes in low-heat operation.

j.Measure time (in sec) for gas meter to complete 1 revolution. Note reading.

k.Refer to Table 15 for cubic ft of gas per hr.

l.Multiply gas rate cu ft/hr by heating value (Btu/cu ft).

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