SECT1 ACCES CONTENTS C Gasoline Heater 500 700 and 900 Series 1200 Series Direct Air Heater 500 700 and 900 Series 1200 Series Instrument Panel Cover 500 700 and 900 Series GASOLINE HEATER 5C 11 Page General Description 11 2 Heating System Components 11 2 Cycle of Operation 11 4 Service Diagnosis 11 6 Introduction 11 6 Diagnosis Guide 11 6 Wiring 11 8 Ventilator Blower 11 9 Combustion Blower 11 9 Thermostat 11 9 Breaker Points 11 9 Ignition Coil 11 10 Spark Plug 11 10 Overheat Switch 11 11 Purge Switch 11 12 Heater Control Switch 11 12 Fuel Supply 11 12 Inspection of Burner 11 12 Checking the Nozzle and Fuel Solenoid 11 13 Solenoid Coil Check 11 13 Valve Check 11 13 Nozzle and Spray Pattern Check 11 13 Exhaust Tube 11 14 Heat Exchanger 11 15 Relay 11 15 Service Operations 11 15 Ventilator Blower Motor Replacement 11 15 iON 11 iSORIES F THIS SECTION Page 11 1 11 25 11 28 11 32 11 35 10 700 AND 900 SERIES VDEX Page Combustion Blower Motor Replacement 11 15 Thermostat Replacement 11 17 Heater Control Switch Replacement 11 17 Ignition Unit Base Assembly Breaker Points Replacement 11 17 Ignition Coil Replacement 11 18 Overheat Switch Replacement 11 18 Purge Switch Replacement 11 18 Relay Replacement 11 18 Burner Assembly 11 18 Removal 11 18 Disassembly 11 20 Assembly 11 20 Installation 11 20 Spark Plug Replacement 11 21 Nozzle Replacement 11 21 Solenoid Coil Replacement 11 21 Heat Exchanger Replacement 11 22 Heater Unit Complete 11 22 Removal and Installation 11 22 Air Distributor Case Replacement 11 23 Controls 11 23 Control Knob and Cable Replacement 11 23 Control Assembly Replacement 11 23 Control Adjustments 11 23 Specifications 11 24 Special Tools 11 24