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Be sure clamps are tight. 5 Fig. 11—Downflow Furnace Pressure and Drain Tubing Diagram (2.) Connect drain tube from collector box to inducer outlet box. b. Downflow furnace only: (1.) Reconnect vent pipe. Be sure clamps are tight. (2.) Reinstall vent pipe enclosure. (3.) Connect drain tube from collector box to inducer outlet elbow. 6. Upflow furnace only—reinstall main control box. a. Reinstall main control box on blower shelf. b. Reconnect 15-circuit connector at main control box on blower shelf. 7. Check condition of gasket on cell inlet panel of burner enclosure. Replace gasket if necessary. (See Fig. 12.) Fig. 12—Burner Enclosure 8. Install gas control assembly in furnace. 9. Install diffuser and burner enclosure front. 10. Reconnect pilot leads at 3-circuit connector. 11. Reconnect high-voltage lead to spark generator. 12. Reconnect gas valve leads at 6-circuit connector. 13. Reconnect pressure tubes to gas valve and burner enclosure. Be sure tubes are not kinked. 14. Using a backup wrench, install gas pipe in gas valve. 15. Reconnect gas pipe at ground joint union. 16. Reconnect combustion-air pipe. Tighten hose clamps. 17. Replace blower door only. 18. Turn ON gas and electrical supplies. 19. Check furnace operation through 2 complete operating cycles. Look through sight-glass in burner enclosure to check burners. Burner flames should be clear blue, almost transparent. (See Fig. 13.) p|L0T FLAME BURNER FLAME A WARNING Never use matches, candles, flame, or other sources of ignition to check for gas leakage. Use a soap-and-water solution. Failure to follow this warning could result in a fire, personal injury, or death. 20. Check for gas leaks. 21. After condensate starts to drain, check for condensate leaks. 22. Replace control door. Step 5—Clean Condensate Drainage System 1. Disconnect 5/8-in. drain tube from bottom of inducer housing. (See Fig. 10 or 11.) 2. Disconnect 7/8-in. drain tube from collector box. (See Fig. 10 or 11.) 3. Disconnect condensate drain line from drain trap at compression fitting. 4. Remove 1/4-in. screw(s) securing strap on drain trap. 5. Remove drain trap/hose assembly from furnace and flush with water until clean. 6. Flush external condensate drain line with water until clean. 7. Reassemble condensate drainage system by reversing items 1. through 5. Step 6—Pilot Assembly Check the pilot assembly and clean if necessary at the beginning of each heating season. The pilot flame should be high enough for proper impingement of the safety element and to light the burners. Remove any accumulation of soot and carbon from the safety element. Check spark electrode gap. (See Fig. 14 for proper spark gap and Fig. 15 for correct pilot location.) Step 7—Electrical Controls and Wiring NOTE: There may be more than 1 electrical supply to the unit. 6 A79080 Fig. 14—Position of Electrode to Pilot With power disconnected to the unit, check all electrical connections for tightness. Tighten all screws on electrical connections. If any smokey or burned connections are found, disassemble the connection, clean all parts, strip wire, and reassemble properly and securely. Reconnect electrical power to the unit and observe unit through 1 complete operating cycle. Electrical controls are difficult to check without proper instrumentation. ELECTRICAL NOISE AND INTERFERENCE - This equipment generates and uses radio frequency energy and, if not installed and used properly (in strict accordance with the manufacturer’s instructions), may cause interference with radio and television reception. The unit has been tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of Federal Communications Commission (FCC) Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in an installation. If this equipment does cause interference to radio or television reception (which may be determined by turning the equipment off and on), the user is encouraged to try correcting the interference by 1 or more of the following measures: (1.) Reorient receiving antenna. (2.) Relocate receiver with respect to equipment. (3.) Move receiver away from equipment. (4.) Plug receiver into different outlet so that equipment and receiver are on different branch circuits. (5.) Slide Ferrite core electrical noise suppressor over thermostat wire. If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The following booklet prepared by the FCC may be helpful: “How to Identify and Resolve Radio-TV Interference Problems.” This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4. SERVICE DIAGNOSTICS — This furnace has a light emitting diode (LED) display to aid the install...

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