SAFETY FIRST
• Don’t bypass the power cord’s ground lead with two-wire extension cords or plug adaptors.
• Don’t disconnect green/yellow safety-earth ground wire that connects the ground lug of the power receptacle to
the chassis ground.
• Don’t plug in the power cord until directed by the installation instructions.
• Don’t repair the furnace unless you are a qualified technician and know how to work with hazardous voltages.
• Don’t locate and operate the furnace in close proximity to combustible materials.
• Observe all WARNING statements. They point out situations that can cause injury or equipment damage.
• Disconnect the power cord before attempting to service.
• It is the user’s responsibility to use only cleaning agents and materials that will not result in hazards to the
equipment or material contained within.
• When replacing the main power supply cord use only a direct equivalent high-temperature cable.
• When replacing the main fuse use only a direct equivalent.
SAFETY
Summary of Contents for 3-130
Page 8: ...2 6 SCHEMATIC 2 4 SECTION 2 TROUBLESHOOTING A CONTROL...
Page 21: ...5 9 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE POWER SUPPLY...
Page 22: ...5 10 SECTION 5 TROUBLESHOOTING 3 STAGE 5 8 SCHEMATICS TEMPERATURE CIRCUIT LCD DISPLAY CIRCUIT...
Page 23: ...5 11A 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE MICROPROCESSOR CIRCUIT...
Page 24: ...5 11B 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE...
Page 25: ...5 12 SECTION 5 TROUBLESHOOTING 3 STAGE PD A 5 9 WIRING DIAGRAM...