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Critical safety warnings regarding fire, explosion, and personal injury.
Installation compliance with codes, gas type, location, and clearances.
Explains direct vent vs. conventional, confined/unconfined spaces, and air sources.
Details requirements for drawing combustion air from various locations and air quality.
Covers Category IV venting, pipe material, length, and installation procedures.
Specifies clearances and requirements for horizontal and vertical vent terminations.
Guidelines for insulating vent pipes to prevent freezing in cold climates.
Procedures for replacing existing venting systems and checking for recalls.
Methods for disposing of furnace condensate according to local codes.
Standards for installing plenums and air ducts, including airflow recommendations.
Procedures for connecting supply air ducts to upflow, horizontal, and downflow furnaces.
Methods for connecting return air ducts for upflow, horizontal, and downflow furnace configurations.
Options for reducing furnace noise transmission through ductwork.
Basic requirements for furnace installation, including leveling and protection from water.
Specific instructions and warnings for installing furnaces in an upflow configuration.
Specific instructions and warnings for installing furnaces in a downflow configuration.
Guidelines and warnings for installing furnaces in a horizontal orientation.
Instructions for creating an opening and positioning the furnace on a concrete slab.
Procedures and safety precautions for rotating the inducer assembly for venting flexibility.
Routing guidelines for pressure switch tubing on different furnace models.
Installation instructions for the finish flange used for venting.
Usage and installation of rubber grommets for sealing openings.
Instructions for using PVC components for vent and drain line connections.
Steps to remove the furnace bottom panel for access to internal components.
Alternative method for removing the bottom panel if the standard method fails.
Procedures and warnings for testing gas piping connections for leaks.
Procedures for derating the furnace input based on altitude and gas heating value.
Guidelines for proper line voltage wiring, including dedicated circuits and polarity.
Importance and methods for ensuring proper electrical grounding of the furnace.
Wiring instructions for connecting thermostats and low voltage controls to the furnace.
Wiring configuration for a single-stage AC and thermostat setup.
Wiring configuration for a single-stage AC with a two-stage thermostat.
Wiring configuration for a two-stage AC and two-stage thermostat system.
Explanation and setup for the autostaging feature with single-stage thermostats.
Instructions for configuring blower speeds using dip switches on fixed speed models.
Instructions for configuring blower speeds using dip switches on variable speed models.
A checklist of essential items to verify before starting the furnace.
Step-by-step instructions to follow for the initial start-up of the furnace.
Procedures for checking and adjusting the furnace's gas input rate for correct operation.
Method for measuring and confirming the temperature rise across the furnace.
Detailed sequence of operations during a heating call.
Detailed sequence of operations when the cooling system is activated.
Operation of the furnace blower when set to fan-only mode.
Explains the function of safety components like limit switches and flame sensors.
Describes components related to gas flow and ignition, such as the gas valve and igniter.
Explains the function of the inducer assembly in venting combustion products.
Importance of air filters, types, and replacement/cleaning recommendations.
Steps for cleaning the furnace burners and ensuring proper flame characteristics.
Annual inspection and cleaning recommendations for the heat exchanger and burners.
Checks required for the vent system to ensure proper draft and prevent blockages.
Using diagnostic LEDs and tables to identify and resolve furnace operational faults.
Tables providing airflow and temperature rise data for various heating switch settings.
Tables detailing airflow and capacity for cooling and heat pump operation.
Tables for calculating gas flow rates based on time per revolution of the gas meter.
Tables indicating the capacity of gas pipes based on diameter and length.
Diagrams and descriptions of fixed and variable speed motor control boards.
Diagram and explanation of the two-stage furnace control board connections.
Wiring diagram for two-stage, fixed speed upflow furnace models.
Wiring diagram for two-stage, fixed speed downflow furnace models.
Wiring diagram for two-stage, variable speed upflow furnace models.
Wiring diagram for two-stage, variable speed downflow furnace models.
Table specifying required clearances for vent terminals based on location and furnace type.
Illustrations showing horizontal and vertical venting configurations.
Diagrams illustrating different 1-pipe and 2-pipe venting options for upflow furnaces.
Diagrams illustrating different 1-pipe and 2-pipe venting options for horizontal furnaces.
Diagrams illustrating different 1-pipe and 2-pipe venting options for downflow furnaces.
Diagram identifying key components in upflow and horizontal furnace configurations.
Diagram identifying key components in downflow furnace configurations.
Checklist items for verifying electrical connections, polarity, and thermostat settings.
Checklist items for verifying gas type, connections, pressure, and altitude deration.
Checklist items for confirming adequate combustion air, proper venting, and filter status.
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