HEATING AND AIR CONDITIONING SYSTEM DIAGNOSIS

Manual HVAC Control Systems

  • Vent

  • Preventing evaporator freeze-up

  • Light duty trucks

  • Rotary vacuum valve

  • Two wire motor

  • It causes a skewed signal in the feedback circuits

  • Absence of source vacuum

  • Verify

  • Preliminary checks

  • Perform system diagnostic checks

  • Check for bulletins

  • Diagnosis

  • Isolate the root cause

  • Repair and verify fix


Special Configurations

  • Dual Zone HVAC Control Systems

  • Rear HVAC Control Systems

  • HVAC Steering Wheel Controls

  • Customer Concerns

  • Diagnostic Exercise


Automatic HVAC Control Systems

  • Inside air temperature from 65 – 85 degrees regardless of outside temperature

  • HVAC controller

  • The HVAC controller will try to maintain set temperature as much as possible

  • Monitor the discharge temperatures from the heater and A/C outlets

  • All sensors have reached the same ambient temperature


ACR2000 Diagnosis

  • A/C System Performance

  • Pressure Zone Diagnostics

  • ACR2000 Diagnostic Exercise


Retrofitting

  • Legal & Cost Issues

  • Equipment

  • Retrofitting Process

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