HP 422690 I manual Furnace Dimensions and Clearances

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	GAS																							MOTOR																																		FURNACE																					RETURN AIR																					SUPPLY AIR																											CLEARANCE TO COMBUSTIBLES***																																																																					VENT SIZE
	INPUT*																											SIZE*																														WIDTH**																												SIZE**																		SIZE**																																										(INCHES)
	(Btu/hr)																												(HP)																																	“A”																										“B”																	“C”																					TOP								SIDES															BACK													FRONT																	VENT																											(INCHES)
54,000															1/3																																									17 1/2																													15 3/4”																15 15/16”																					1											0													0														2																	0																							2
72,000															1/2																																									17 1/2																													15 3/4”																15 15/16”																					1											0													0														2																	0																																2 OR 3
72,000															3/4																																									20 1/2																													18 3/4”																18 15/16”																					1											0													0														2																	0																																2 OR 3
90,000															1/2																																									17 1/2																													15 3/4”																15 15/16”																					1											0													0														2																	0																																2 OR 3
90,000															3/4																																									20 1/2																													18 3/4”																18 15/16”																					1											0													0														2																	0																																2 OR 3
108,000															3/4																																									23 1/2																													21 3/4”																21 15/16”																					1											0													0														2																	0																							3
126,000															3/4																																									23 1/2																													21 3/4”																21 15/16”																					1											0													0														2																	0																							3

*See Furnace Rating Plate located on blower door.

**These are furnace dimensions. See Sections 9 and 10 for proper ductwork and floor opening dimensions.

***Certified for installation on wood flooring. 30-inch front clearance required for service. 18-inch front clearance required in an alcove.

Figure 1. Furnace Dimensions and Clearances.

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Installer’s Information Manual

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Contents ?? What to do if YOU Smell GAS Important Safety Rules Table of ContentsMeeting Codes Determining Best Furnace LocationFurnace Dimensions and Clearances Providing Venting and Combustion AIR PVC Pipe Installation InstructionsGeneral Venting Guidelines Termination Location and Clearances Existing Vent ConsiderationsDirect or NON-DIRECT VENTING? United StatesDirect Venting Instructions two pipe system Determining Vent LengthAltitude Furnace Pipe See Note Input DIANON-DIRECT Venting Instructions one pipe system DIRECT-VENT TerminationAllowable Pipe Length feet NON-DIRECT Vent Termination Combustion and Ventilation AIR non-direct ventUnconfined Space Installation non-direct vent Area PER Diameter Given Pipe Opening Installing GAS Piping InstallationTesting for Leaks Condensate DrainInstalling Electrical Wiring Volt WiringFurnace Wiring Diagram Sequence of Operation Installing Duct System Selecting and Installing Filter CabinetsFilter Cabinets GAS Motor Disposable HighHorse AIR Filter Velocity WashableGAS Supply Pressure and Pilot Adjustment Pilot Flame AdjustmentChecks Before Starting Furnace Checking GAS Supply PressureChecking GAS Input Rate Manifold Pressure AdjustmentNatural GAS Input Rate Determining Correct Orifice Size Derating for High AltitudePropane LP GAS Input Rate GAS Changing Main Burner OrificesHeating Value Adjusting Blower Speed Wire ColorMeasuring Duct System Static Pressure GAS Motor AIR Conditioning Tonnage Input SizeMeasuring AIR Temperature Rise Checking ControlsSetting Blower Timings Maintaining Furnace in Good Working OrderAccessories Other Information Publications