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Primary Cell Kit Cancels: IIK 398A-40-20 IIK 398A-40-26 2-1-92 Installation Instructions Part No. 308156-763 NOTE: Read the entire instruction before starting the installation. INTRODUCTION This instruction covers installation of a Primary Cell Kit (Part No. 308156-763) in an Upflow or Downflow Gas-Fired Condensing Furnace. NOTE: A gasket kit, (Part No. 318051-751 through -753 for downflow, or 318050-751 through -754 for upflow), a releasing agent (Pam cooking spray or equivalent), and RTV sealant (G.E.
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122, 162, or Dow-Corning 738) are required prior to starting the installation. SAFETY CONSIDERATIONS Installation and service of 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 literature, and on tags and labels attached to the unit. Follow all safety codes. Wear safety glasses and work gloves. Have a fire extinguisher available. COMBUSTION-AIR DIFFUSER Fig. 1–Combustion Air Diffuser Location (Upflow Models) A84153 5. Disconnect inducer motor leads. 6. Disconnect electrical connector from main control box at blower shelf. 7. Remove screws securing main control box to blower shelf and lay control box in bottom of furnace. 8. Loosen hose clamp and remove drain tube from bottom of inducer housing (lower side of blower shelf). 9. Loosen hose clamp, at pressure switch, on pressure tube from plastic tee. Remove tube from pressure switch. 10. Loosen hose clamp, at collector box, on tube from pressure switch. Remove tube from collector box. 11. Loosen hose clamp, at collector box, on drain tube from inducer outlet box. Remove tube from collector box. 12. Remove and discard 5 mounting screws securing inducer assembly (motor, pressure switch, inducer housing, and inducer outlet box). Remove inducer assembly from furnace. NOTE: Variable-Speed Furnaces only–remove screws securing ECM inducer control box to casing side and remove inducer control box assembly from furnace. Step 2–Removal of Gas Control Assembly 1. Using a backup wrench, disconnect gas pipe at union and remove pipe from gas valve. 2. Remove burner enclosure front. 3. Remove combustion air diffuser. (See Fig. 1.) 4. Disconnect wires from flame roll-out switch (if used), limit switch, pilot or hot surface ignition (HSI) harness, gas valve, and spark generator/ignitor lockout control (if used). 5. Remove intermittent ignition device as follows: Before beginning any installation or modification, be sure the main electrical disconnect switch is in the OFF position. Electrical shock can cause personal injury or death. DESCRIPTION AND USAGE The Primary Cell Kit is designed for use when replacement of a factory-installed primary cell is required. By replacing a damaged or failed primary cell, the furnace will provide an extended period of dependable service. The Primary Cell Kit contains the following items: Primary heat exchanger cell Cell inlet gasket Cell outlet gasket Cell mounting screw Stainless steel screw (in cloth bag) Installation Instruction INSTALLATION–UPFLOW MODELS ONLY Step 1–Removal of Inducer Assembly 1. Turn OFF gas and electrical supplies to furnace.