Carrier 58SX 28SI Gas Furnace Owners Manual

Condensing Heat Exchanger Kit Cancels: IIK 398A-40-2 IIK 398A-40-27 3-15-92 Installation Instructions Part No. 312731-755 through -761 NOTE: Read the entire instruction before starting the installation. INTRODUCTION This instruction covers installation of a polypropylene-laminated (PPL) steel condensing heat exchanger and collector box assembly kit in an upflow condensing furnace. See Table 1 for furnace and kit combinations.

NOTE: If this kit is used to replace a stainless steel condensing heat exchanger in a Model 398A, Series B through F, or a 58SX, Series 110 through 180 Furnace, some modifications to the vent system or unit may be necessary. Refer to Step 6–Replacing a stainless steel condensing heat exchanger with a PPL condensing heat exchanger. NOTE: Obtain a releasing agent (Pam or equivalent) and RTV sealant (G.E. 122, 162, or Dow-Corning 738) before 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. KIT PART NO. 312731-755 312731-756 312731-761 312731-757 312731-758 312731-759 312731-760 Table 1–Kit Usage 398A 030040 036040 036060 — 036080 048080 048100 060100 060120 FURNACE MODEL & SIZE 320A/398B/ 58SX/SXA/SXC 58SXB/58VUA 040-FG or BC — 040-GG or CC — 060-GG or CC — — 060 080-GG or BC 080 080-JG or CC 080 100-JG or CC 100 100-LG or DC 100 120-LG or CC — Step 1–Removal of Inducer Assembly 1. Turn OFF gas and electrical supplies to furnace. 2. Remove blower and control access doors. 3. Loosen hose clamp at vent pipe connection; disconnect vent pipe. Position vent pipe out of way. 4. Disconnect electrical connector from inducer control box (if used) and disconnect wires from pressure switch. 5. Disconnect inducer motor leads. 6. Disconnect edge 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 (bottom 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. 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. 11. Loosen hose clamp, at collector box, on drain tube from inducer outlet elbow. Remove tube from collector box. 12. Remove and discard mounting screws securing inducer assembly (motor, pressure switch, inducer housing, mounting bracket, and inducer outlet elbow). Remove inducer assembly from furnace. When necessary, remove screw securing motor ground wire to blower shelf. (1) 13. Remove inducer controller (if used) on left side of casing.