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Condensing Heat Exchanger Kit Cancels: New IIK 350M-35-3 9-1-93 Part No. 320722-751, -752, -753, and -754 NOTE: Read the entire instruction manual before starting the installation. INTRODUCTION This instruction covers installation of the condensing heat exchanger kit Part No. 320722-751, -752, -753, and -754 in multipoise, 40-in. tall, condensing gas furnaces. NOTE: A releasing agent (Pam cooking spray) and RTV sealant (G.E.
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162 or Dow-Corning 738) are required before starting installation. Do not substitute any other type of RTV sealant. SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained personnel should install or service heating equipment. Untrained personnel can perform basic maintenance functions such as cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached to the unit. Follow all safety codes. Wear safety glasses and work gloves. Have a fire extinguisher available. KIT PART NO. Installation Instructions Table 1–Kit Usage MODEL 340MAV 350MAV 490AAV 024040 036040 036060 048060 036080 048080 060080 048100 060100 060120 355MAV 58MCA 58MXA 040-08 040-12 060-12 060-16 080-12 080-16 080-20 100-16 100-20 120-20 58MVP 320722-751 042060 060-14 320722-752 320722-753 320722-754 042080 060100 042040 080-14 100-20 040-14 INSTALLATION Step 1–Remove Whole Cell Panel Assembly See Fig. 1 for furnace component locations. See Fig. 2 for an exploded view of heat system components. 1. Turn gas and electrical supplies to furnace off. 2. Remove furnace door. 3. Remove blower access panel. 4. Disconnect field power supply wires from J-box. 5. Remove 2 screws securing J-box. 6. Remove 2 screws securing top filler panel and rotate upwards to remove or allow the heat exchanger to be removed from front of furnace. 7. Disconnect combustion-air intake pipe from intake housing and move pipe out of furnace casing. 8. Disconnect gas supply pipe from gas valve using backup wrench. 9. Disconnect vent pipe from inducer housing by loosening clamp and move pipe out of furnace casing. 10. Disconnect drain tubes and relief port tubes from condensate trap. 11. Remove motor leads, transformer wires, door switch wires, and auxiliary limit switch wires (if present) from control center and pull wires through blower shelf. 12. Remove 2 screws securing blower to blower shelf. 13. Remove 2 screws adjacent to blower mounting screws securing blower shelf to cell panel. 14. Remove 3 screws from each side of cell panel. 15. Remove control center by removing screw and pressing tabs inward. 16. Secure control center and J-box to manifold for removal purposes only. Turn off gas and electrical supplies to unit before beginning any installation or modification. Follow operating instructions on label attached to furnace. Failure to follow this warning could result in personal injury or death. DESCRIPTION AND USAGE Use this condensing heat exchanger kit to replace a failed, factory-installed, condensing heat exchanger. This condensing heat exchanger kit contains the following items: Condensing heat exchanger assembly (includes collector 1 box) Outlet cell panel gasket 1 Outlet cell panel screw 7 max Installation Instructions 1 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.