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Defines DANGER, WARNING, CAUTION, and NOTE signal words and their application.
Provides a general overview of the furnace model and its design-certified status.
Highlights critical safety warnings for fire, explosion, shock, and property damage.
Details requirements for furnace installation, including codes and operation.
Lists national and local codes for installation, combustion, electrical, and venting.
Warns of potential damage to electronic components from static discharge.
Warns about corrosive air contaminants affecting furnace parts and lifespan.
Specifies requirements for protecting electrical components and placement relative to water.
Guidance on installing cooling coils relative to the furnace to prevent condensation.
Specifies the need for adequate air for combustion, ventilation, and dilution.
Warns about halogen compounds in air causing corrosion of heat exchangers.
Details requirements for providing outdoor air for combustion and ventilation.
Explains indoor air usage for combustion if specific conditions are met.
Defines criteria for using the standard method for combustion air supply.
Details conditions for using the known air infiltration rate method for combustion air.
Instructions for upflow installation, including bottom and side return air options.
Specifies requirements for installing on combustible flooring using specific accessories.
Details methods for supporting furnaces in horizontal installations, including suspended and platform.
Describes the use of sheet metal for flame roll-out protection.
Warns against operating without a filter or with the access door removed.
Covers duct system design, sealing, and clearance requirements.
Addresses acoustical lining and fibrous ductwork standards.
Details requirements for connecting supply air ducts and access panels.
Instructions for connecting supply air ducts for upflow and horizontal furnace orientations.
Instructions for connecting supply air ducts for downflow furnace orientations.
Details return air connection requirements for downflow furnaces.
Details return air connection requirements for upflow and horizontal furnaces.
Warns about hazards associated with gas piping installation and testing.
Describes connections to the gas valve and manifold assembly.
Illustrates the standard gas pipe arrangement including sediment trap and shutoff valve.
Instructions for relocating the junction box (J-Box).
Details the installation of a field-supplied electrical box on the furnace casing.
Highlights critical electrical shock and fire hazards during installation and service.
Specifies requirements for 115-V wiring, including polarity and grounding.
Details wiring and connection procedures for the J-Box and field electrical boxes.
Provides electrical specifications for various furnace models.
Instructions for installing BX cable and power cords into the furnace J-Box.
Details 24-V wiring connections for thermostats and humidifiers.
Instructions for connecting accessories like Electronic Air Cleaners.
Explains wiring for 24VAC and 115VAC humidifiers.
Covers general rules for vent sizing, installation, and materials.
Outlines critical steps for safe venting system operation to prevent CO poisoning.
Details requirements for using chimney adapter kits with masonry chimneys.
References specific NFPA and NFGC sections for U.S. venting regulations.
Provides a flowchart for inspecting chimneys and determining suitability for venting.
Advises on maintaining proper temperatures and rates to prevent condensation.
Details requirements for vent connector sizing and increaser fittings.
Warns about sharp edges on sheet metal parts and necessary protective gear.
Warns about hot vent pipes being accessible to children in downflow installations.
States furnace is not approved for direct sidewall venting without proper approval.
Covers essential general checks before operating the furnace.
Highlights hazards related to gas leaks and improper operation.
Warns about sharp edges during handling and servicing.
Step-by-step guide for initiating furnace operation.
Provides multipliers for adjusting gas input rate based on installation altitude.
Details how to determine and adjust gas input rate and manifold pressure.
Explains how to determine correct gas input rate considering altitude and gas properties.
Provides an example calculation for determining correct input rate at a specific altitude.
Instructions for adjusting blower speed for optimal temperature rise.
Guidance on checking and adjusting air temperature rise for proper operation.
Procedure to test the main limit switch functionality.
Procedure to test the draft safeguard switch for proper operation.
Details how to check the pressure switch for proper draft inducer blower operation.
A final checklist before operating the furnace, including tool cleanup and final checks.
Highlights critical hazards during service, including fire, explosion, shock, and environmental.
Guidance on servicing electrical controls, wiring, and troubleshooting with status codes.
Explains the importance of periodic maintenance and consulting a dealer.
Lists essential monthly and seasonal maintenance tasks for the furnace.
Instructions for cleaning or replacing the air filter, noting airflow direction.
Warns of electrical shock hazards and the importance of proper blower wheel balance.
Warns that improper temperature rise can shorten heat exchanger life.
Details the procedure for cleaning heat exchangers, emphasizing when replacement is necessary.
Describes cleaning furnace cells and applying new sealant to the collector box flange.
Reiterates the prohibition of open flames for gas leak testing.
Details the step-by-step sequence of operation during heating mode.
Explains operation during cooling mode and continuous blower operation.
Describes the furnace operation when integrated with a heat pump system.
Directs users to wiring diagrams for reference.
Guides users on how to diagnose and resolve common furnace issues.
Checks for power, voltage, and switch status to start troubleshooting.
Procedures for recalling status codes and verifying control response to thermostat signals.
Explains how to identify the furnace model number based on its digit positions.
General