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PDF Airtronic Repair Manual

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AIRTRONIC D2/D4 Diagnostic and Repair Manual for Customer Service and Technical Staff

System Overview

The Espar Airtronic D2 heater is designed to lower idling by providing an alternative in-cab heat solution. It operates via controllers (Mini, Digi, or Digi-Max) that control cab temperature and offer diagnostic capabilities. The heater undergoes a diagnostic check upon startup, followed by a sequence to ignite fuel. If unsuccessful after two attempts, it sets a fault code (e.g., code 52 for failure to ignite). The unit's operation involves air flow through the combustion chamber, fuel atomization and ignition, and temperature regulation based on the set point or remote air temperature sensor for Digi/Digi-Max controllers.

Diagnostic Devices

EDITH PC-Based Diagnostics (Preferred)

Digi-Diagnostic Tool

Visual Inspection

Fault Code / Troubleshooting

Service Information

Typical Non-Warrantable Repairs

Issues caused by plugged fuel filters, atomizer screens, overheating, restricted combustion intake/exhaust, carboned burner chamber, and modified parts during removal or repair.

Important Notes

This manual supports service technicians and end users in North America and is not applicable to marine installations. Specifications are subject to change without notice for continuous improvement.

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