Bryant 120 instruction manual Specific Gravity of Natural GAS Altitude Range, Btuh/Cu Ft

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312A

Table 16 – Orifice Size and Manifold Pressure for Gas Input Rate

(Tabulated Data Based on 21,000 Btuh High-Heat/14,500 Btuh for Low-Heat Per Burner, Derated 4% for Each 1000 Ft Above Sea

level)

			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			AVG. GAS		0.58			0.60			0.62			0.64
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		HEAT VALUE
	(FT)		(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			900	42		3.2/1.5	42		3.3/1.6	42		3.4/1.6	42		3.5/1.7
			925	43		3.7/1.8	43		3.8/1.8	42		3.2/1.5	42		3.3/1.6
			950	43		3.5/1.7	43		3.6/1.7	43		3.7/1.8	43		3.8/1.8
U.S.A.		0 to	975	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.7/1.7
and		0 to	1000	44		3.6/1.7	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
and		2000	1000	44		3.6/1.7	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
Canada
			1025	44		3.4/1.6	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6
			1025	44		3.4/1.6	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6
			1050	44		3.3/1.6	44		3.4/1.6	44		3.5/1.7	43		3.2/1.5
			1075	45		3.8/1.8	44		3.2/1.5	44		3.3/1.6	44		3.4/1.6
			1100	46		3.8/1.8	45		3.7/1.8	44		3.2/1.5	44		3.3/1.6
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			AVG. GAS		0.58			0.60			0.62			0.64
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		HEAT VALUE
	(FT)		(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
		U.S.A.	800	43		3.8/1.8	42		3.2/1.5	42		3.3/1.6	42		3.4/1.6
		U.S.A.	825	43		3.5/1.7	43		3.7/1.7	43		3.8/1.8	42		3.2/1.5
		Altitudes
		Altitudes	850	43		3.3/1.6	43		3.5/1.6	43		3.6/1.7	43		3.7/1.8
		2001 to
U.S.A.		2001 to	875	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
U.S.A.		3000 or	875	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7
and		3000 or	900	44		3.4/1.6	44		3.5/1.7	43		3.2/1.5	43		3.3/1.6
and		Canada	900	44		3.4/1.6	44		3.5/1.7	43		3.2/1.5	43		3.3/1.6
Canada
			925	44		3.2/1.5	44		3.3/1.6	44		3.5/1.6	44		3.6/1.7
		Altitudes	925	44		3.2/1.5	44		3.3/1.6	44		3.5/1.6	44		3.6/1.7
		2001 to	950	45		3.7/1.8	45		3.8/1.8	44		3.3/1.6	44		3.4/1.6
		4500	975	46		3.7/1.8	46		3.8/1.8	45		3.8/1.8	44		3.2/1.5
			1000	46		3.5/1.7	46		3.6/1.7	46		3.8/1.8	45		3.7/1.8
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			AVG. GAS		0.58			0.60			0.62			0.64
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			775	43		3.5/1.7	43		3.7/1.7	43		3.8/1.8	42		3.2/1.5
			800	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.7/1.7
			825	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6
U.S.A.		3001 to	850	44		3.4/1.6	44		3.5/1.7	44		3.6/1.7	43		3.2/1.5
Only		4000	875	45		3.8/1.8	44		3.3/1.6	44		3.4/1.6	44		3.5/1.7
			900	46		3.8/1.8	45		3.8/1.8	44		3.2/1.5	44		3.3/1.6
			925	46		3.6/1.7	46		3.7/1.8	45		3.7/1.8	45		3.8/1.8
			950	46		3.4/1.6	46		3.5/1.7	46		3.7/1.7	46		3.8/1.8
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			AVG. GAS		0.58			0.60			0.62			0.64
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		HEAT VALUE
	(FT)		(BTUH/CU FT)	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			750	43		3.3/1.6	43		3.4/1.6	43		3.5/1.7	43		3.6/1.7
			775	44		3.6/1.7	43		3.2/1.5	43		3.3/1.6	43		3.4/1.6
			800	44		3.3/1.6	44		3.4/1.6	44		3.6/1.7	43		3.2/1.5
U.S.A.		4001 to	825	45		3.8/1.8	44		3.2/1.5	44		3.4/1.6	44		3.5/1.6
Only		5000	850	46		3.8/1.8	45		3.7/1.8	45		3.8/1.8	44		3.3/1.6
			875	46		3.5/1.7	46		3.7/1.7	46		3.8/1.8	45		3.7/1.8
			900	47		3.8/1.8	46		3.5/1.7	46		3.6/1.7	46		3.7/1.8
			925	47		3.6/1.7	47		3.7/1.8	47		3.8/1.8	46		3.5/1.7
			AVG. GAS				SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE			HEAT VALUE		0.58			0.60			0.62			0.64
	(FT)		AT ALTITUDE
	(FT)		AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTUH/CU FT)	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			725	44	3.5/1.7		43	3.2/1.5		43	3.3/1.6		43	3.4/1.6
			750	44	3.3/1.6		44	3.4/1.6		44	3.5/1.7		43	3.2/1.5
			775	45	3.7/1.8		44	3.2/1.5		44	3.3/1.6		44	3.4/1.6
U.S.A.		5001 to	800	46	3.7/1.8		46	3.8/1.8		45	3.8/1.8		44	3.2/1.5
Only	6000		825	46	3.5/1.7		46	3.6/1.7		46	3.7/1.8		46	3.8/1.8
			850	47	3.7/1.8		47	3.8/1.8		46	3.5/1.7		46	3.6/1.7
			875	47	3.5/1.7		47	3.6/1.7		47	3.7/1.8		46	3.4/1.6
			900	48	3.8/1.8		47	3.4/1.6		47	3.5/1.7		47	3.7/1.7

* Orifice numbers 43 are factory installed

44

Image 44

Contents Ama CUT Hazard Safety ConsiderationsFurnace Reliability Hazard Dimensions IntroductionWidth Bottom Flue Cabinet SizeInstallation Electrostatic Discharge ESD Precautions Procedure Codes and StandardsCarbon Monoxide Poisoning and Unit Damage Hazard LocationGeneral FIRE, Injury or Death Hazard Fire HazardProperty Damage Hazard Location Relative to Cooling EquipmentAIR for Combustion Ventilation Furnace Corrosion HazardCarbon Monoxide Poisoning Hazard Outdoor Combustion Air MethodAir for Combustion, Ventilation and Dilution for Outdoors Installation Upflow InstallationDownflow Installation Horizontal InstallationFIRE, EXPLOSION, and Carbon Monoxide Poisoning Hazard Suspended Furnace SupportFloor and Plenum Opening Dimensions Roll-Out ProtectionWidth Opening dimensionsFurnace Plenum Opening Floor Opening Casing Horizontal Unit Suspension Filter Arrangement Carbon Monoxide Poisoning Hazard AIR DuctsGeneral Requirements Ductwork Acoustical Treatment Supply Air ConnectionsAir Delivery CFM With Filter Speed External Static Pressure IN. WC Size Inlet2380 2285 2200 2085 1970 1835 Air Delivery CFM With Filter* Downflow FurnacesReturn Air Connections GAS Piping Fire or Explosion HazardUpflow Return Air Configurations and Restrictions Maximum Capacity of Pipe Furnace Damage HazardWiring Electrical Connections Electrical Shock and Fire HazardElectrical Shock Hazard Furnace MAY not Operate HazardElectrical Connection to J-BOX Electrical DataBOX Relocation Power Cord Installation in Furnace J-BOX BX. Cable Installation in Furnace J-BOXElectrical Box on Furnace Casing Side. See Fig Fire or Electrical Shock HazardTwo-Stage Furnace with Two-Speed Air Conditioner See notes 2, 11, and 12 on the page following these figures Accessories VentingGeneral Venting Requirements Masonry Chimney RequirementsChimney Inspection Chart Appliance Application Requirements Vent Height Internal Area of ChimneyUpflow Application-Vent Elbow Up Downflow Application-Vent Elbow Up Horizontal Right Application Vent Elbow Right Furnace Vent Orienta Orientation Tion PUTBTUH/HR Diameter Height FTRounded End of Knockout Burn HazardSTART-UP, ADJUSTMENT, and Safety Check Start-Up ProceduresGeneral Fire and Explosion HazardAdjustments Stage Furnace Setup Switch DescriptionU.S Altitude Derate Multiplier for U.S.ARedundant Automatic Gas Control Valve Seconds Size of Test Dial For Revolution Gas Rate cu ft/hrFurnace Overheating Hazard Speed Selection Color Speed AS ShippedDesired Heating Mode Setup Switch Blower OFF Delay SEC Check Safety ControlsStage Furnace Blower OFF delay Setup Switch Checklist Altitude Range Specific Gravity of Natural GASBTUH/CU Gravity6001 to Specific Gravity of Natural GAS Altitude Range Heat Value Specific Gravity of Natural GAS Altitude RangeBTUH/CU FT Service and Maintenance Procedures Electrical SHOCK, Fire or Explosion HazardFIRE, Personal Injury and Unit Damage Specific Gravity of Natural GAS Heat Value AT AltitudeCare and Maintenance Electrical Controls and Wiring Electrical Shock HazardIntroduction Unit Operation HazardService Wiring Diagram Cleaning AND/OR Replacing AIR Filter Filter size informationBlower Motor and Wheel Electrical Shock Hazard Furnace Filter Size CasingCleaning Heat Exchanger Unit Damage HazardSequence of Operation Igniter Position Top ViewTwo-Stage Heating Adaptive mode with Single-Stage Thermostat Single-Speed Cooling Single-Stage Thermostat and Two-Speed Cooling Adaptive ModeThermidistat Mode Continuous Blower Mode Wiring DiagramsTroubleshooting Troubleshooting Guide 2-Speed Blocked vent shutoff switch used in Chimney Adapter Kit Page Catalog No. II312A---45---8

120 specifications

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