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System Diagnostics and Troubleshooting Procedures

System Diagnostics and Troubleshooting Procedures


Pen Style Multimeter with Built-in Test Probe for One-Handed Operation
Amprobe DM73C Pen Probe Style Digital Multimeter

automatically selects between AC voltage, DC voltage or resistance measurement based on the test point to which the leads are connected.
Amprobe PM55A Precision Pocket Multimeter

Clamp meters


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System Diagnostics and Troubleshooting Procedures

John Tomczyk

Provides the reader with the necessary information to successfully diagnose air conditioning and refrigeration system problems.

Systematic troubleshooting and diagnostics of; airflow problems, refrigerant cycle malfunctions, suction and liquid line restrictions, oil logged evaporator, undercharge, overcharge, compressor inefficiencies, dirty condenser, air in the system, restricted metering device, and low and high condenser entering air temperatures are detailed.

Systematic diagnosis of the above listed problems using service checklists to assist the service technician to quickly and efficiently troubleshoot a system is explained.

Basic and advanced leak detection covering the following six classes of leaks are detailed;

  • standing leaks
  • pressure dependant leaks
  • temperature dependant leaks
  • vibration dependant leaks
  • combination dependant leaks
  • cumulative micro leaks

Testing procedures for evaporator leaks, condenser leaks, suction and liquid line leaks are all thoroughly explained. Advanced leak detection and modern leak detectors are also included and explained in detail.

System evacuation, deep vacuums, micron gauges and scales, vacuum pumps, vacuum manifolds, system pressure drops, vacuum breaker valves, and gas ballasts are all explained as well as illustrated.

System cleanout procedure after a compressor burnout using suction and liquid line filters and associated graphs are included. Combination acid and moisture test kits are also a part of this module.


Diagnosing Air Conditioning Systems

  • Air Flow
  • Refrigerant Cycle

Systematic Troubleshooting

  • Service Checklist
  • Troubleshooting
    • Undercharge of Refrigerant
    • Overcharge of Refrigerant
    • Overcharged Capillary Tube Systems
    • Dirty Condenser or Restricted Air Flow over Condenser
    • Restricted Liquid Line after the Receiver
    • Restricted Liquid Line before the Receiver
    • Air in the System
    • Restricted Metering Device
    • Restricted Air Flow over Evaporator
    • Oil-Logged Evaporator
    • Inefficient Compressor from Bad Valves

Leak Detection, Evacuation, and Clean-up Procedures

  • Basic Leak Detection
  • Advanced Leak Detection
  • Modern Leak Detectors
  • Material Safety Data Sheet
  • Leak Pinpointing and Area Monitoring
  • System Evacuation Using the Deep Vacuum Method
  • System Burnout
  • Notes

72 pages
8-1/2 x 11


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