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Outlines crucial safety warnings and precautions for handling refrigerants.
Details the step-by-step operation of the system during cooling mode.
Explains the operation and control of the defrost cycle in ComfortNet systems.
Details the step-by-step operation of the system during heating mode.
A chart detailing possible causes and remedies for cooling and heat pump issues.
Procedure for checking system voltage at various points.
Covers access to system information, setup, and diagnostics.
Details troubleshooting steps for the ComfortNet system network.
Provides a table of 7-segment LED codes and their corresponding conditions.
Provides diagnostic codes and corrective actions for specific air handler control boards.
Procedure for checking the high pressure control switch.
Details checks and procedures for diagnosing ECM motors.
Lists unitary diagnostic codes related to LED status and fault descriptions.
Lists unitary diagnostic codes for high line voltage, low pilot voltage, and protector open.
Details unitary diagnostic codes for sensor faults, open fuse, and blower motor issues.
Shows dipswitch settings for controlling electric heater airflow.
Explains how to adjust ECM motor CFM using dipswitches.
Details dipswitch settings and corresponding airflow for electric heat.
Covers general compressor checks, including safety warnings.
Tests the operation of the unloader mechanism on the compressor.
Procedure for testing compressor winding resistance.
Procedure for testing the compressor for ground faults.
Tests compressor operation when other tests fail to find the cause.
Details how to check the reversing valve and solenoid for proper function.
Procedure for testing the defrost control sequence.
Troubleshoots motor control circuits and related components.
Troubleshoots communication issues related to data line voltage and bias switches.
Covers defrost operation, auxiliary heat, and continuous fan modes.
Explains the sequence of operation for AVPTC/MBVC systems with ComfortNet.
Details procedures for leak testing refrigeration systems using nitrogen.
Explains the importance and procedure for system evacuation.
Details procedures for charging the refrigeration system.
Explains how to check compressor efficiency by examining scroll flanks.
Procedure for checking the expansion valve's operation.
Checks compressor efficiency by inspecting scroll flanks.
Addresses compressor burnout, causes, and cleanup procedures.
Shows wiring diagrams for 3-phase and 25kW heat kits.
General