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Crucial warnings and cautions for installation, adjustment, servicing, and operation.
Describes the sequence of events when the furnace calls for heating.
Details the operational sequence when the furnace calls for cooling.
Outlines annual checks for furnace components to ensure proper working order.
Procedure for measuring electrical voltage to diagnose component operation.
Troubleshooting steps for the thermostat and its wiring connections.
How to test the furnace's transformer and control circuit for proper voltage.
Steps for diagnosing and checking the air circulator blower motor's operation.
Method for measuring and adjusting the temperature rise across the heat exchanger.
How to test the primary limit control for proper operation.
Procedure for testing the auxiliary limit control switch.
Steps for checking the induced draft blower motor and its electrical connections.
Instructions for testing the redundant gas valve for proper function.
Procedures for measuring and adjusting gas supply pressure.
Detailed steps for measuring the inlet gas supply pressure.
Method for measuring and adjusting the gas manifold pressure.
Steps for testing the hot surface igniter's resistance and operation.
Procedure for testing the pressure transducer for proper signals.
Safety precautions and checks for the integrated ignition control board.
Procedure for testing the flame sensor's micro-amp reading.
Diagnoses and actions for when the furnace fails to operate and the control LED is off.
Troubleshooting steps for furnace failure with one red flash on the control LED.
General