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Breakdown of the furnace model number nomenclature and its meaning.
Details the serpentine heat exchanger design for efficiency and low profile.
Explains the use of inshot burners for optimal flame and heat transfer.
Describes the secondary heat exchanger for maximum heat extraction and condensation.
Explains the role of the induced draft blower in overcoming gas flow resistance.
Specifies the acceptable voltage range for furnace operation.
Details the mandatory electrical grounding for furnace safety.
Provides steps to verify correct grounding and line voltage polarity.
Explains how to check for correct line voltage polarity for safety.
Specifies inlet and manifold pressure requirements for natural gas.
Specifies inlet and manifold pressure requirements for LP gas.
Details methods for verifying the furnace's input firing rate.
Provides tables for manifold pressure and orifice size based on altitude.
Method to calculate input rate by timing the gas meter's dial rotation.
Table showing acceptable temperature rise ranges for different furnace models.
Provides recommendations for optimal thermostat placement.
Explains how to set heat anticipators for accurate temperature control.
Details how to measure current draw to set the heat anticipator.
Describes the main limit switch and its role in preventing overheating.
Explains the roll out limit switch and its role in detecting flame roll out.
Details operation and reset procedure for manual reset roll out switches.
Describes the auxiliary limit switch for monitoring return air temperature.
Details the transition pressure switch for monitoring condensate drain blockage.
Explains the air proving switch's role in ensuring proper furnace draft.
Information on high altitude pressure switches and their settings.
Identifies factors causing lower than normal negative pressures at the combustion blower.
Identifies factors causing higher than normal negative pressures at the combustion blower.
Tables detailing pipe diameter requirements for different configurations.
Diagram for concentric vent and combustion air roof termination.
Diagram for concentric vent and combustion air sidewall termination.
Diagram for sidewall inlet vent and exhaust-air termination.
Diagram for sidewall vent termination with exterior risers.
Diagram for rooftop inlet vent and exhaust-air termination.
Tables specifying pipe diameter and elbow count for concentric terminations.
Steps to verify cooling mode operation of the ST9160B control.
Steps to verify heating mode operation of the ST9160B control.
How energizing the G terminal affects blower operation (heating vs cooling).
How energizing G & Y terminals together affects blower operation.
Describes system response to a cooling call from the thermostat.
Describes system response to a circulating fan request.
Details system operation during a heating call.
Guidelines for selecting appropriate blower speeds for heating and cooling.
Criteria for selecting heating speed based on temperature rise and CFM.
Criteria for selecting cooling speed based on AC coil airflow.
Explains the meaning of LED status codes for diagnostics.
CFM performance data for 050 models with 3-ton units.
CFM performance data for 075 models with 3-ton units.
CFM performance data for 100 models with 3.5-ton units.
CFM performance data for 100 models with 5-ton units.
CFM performance data for 125 models with 5-ton units.
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General