Carrier 58MCB Service And Maintenance Instruction

Also see for 58MCB: User's information manual Service and maintenance instructions Owner's manual Nstallation, start-up, and operating instructions Installation, start-up, and operating instructions

Contents

Carrier 58MCB Service And Maintenance Instruction Manual pdf 8 page image

burners. Burner flames should be clear blue, almost transpar-ent. (See Fig. 11.)FIRE OR EXPLOSION HAZARDFailure to follow the safety warnings exactly could result inserious injury, death, or property damage.Never test for gas leaks with an open flame. Use a commer-cially available soap solution made specifically for thedetection of leaks to check all connections.17. Check for gas leaks.18. Replace main furnace door.SECONDARY HEAT EXCHANGERSNOTE: The condensing side (inside) of the secondary heatexchangers CANNOT be serviced or inspected. A small number ofbottom outlet openings can be inspected by removing the inducerassembly. See Flushing Collector Box and Drainage Systemsection for details on removing inducer assembly.Step 5—Flushing Collector Box and Drainage System1. Turn off gas and electrical supplies to furnace.2. Remove main furnace door.3. Disconnect inducer motor and pressure switch wires orconnectors.4. Disconnect pressure switch tubes.5. Disconnect vent pipe from inducer housing outlet by loosen-ing coupling clamp on inducer outlet.6. Disconnect drain tube from inducer housing. (See Fig. 10.)NOTE: Ensure the drain tube disconnected from the inducerhousing is higher than the collector box opening or water will flowout of tube.7. Remove inducer housing assembly by removing 4 boltsattaching assembly to cell panel.8. Flush inside of collector box with water until discharge fromcondensate trap is clean and runs freely.9. Inspect inside area of collector box for any pieces of foreignmaterials and remove them if present.UNIT DAMAGE HAZARDFailure to follow this caution may result in furnace compo-nent damage.Do not use wire brush or other sharp object to inspect ordislodge materials in secondary heat exchangers as cutting thesecondary heat exchanger protective coating may occur.Flush with water only.10. Reassemble inducer assembly by reversing items 5-7. Tightenthe vent coupling clamp screw(s) to 15 in.-lb. of torque.NOTE: If seal between the inducer housing and the collector boxis damaged in any way, it must be repaired. To repair, applysealant releasing agent such as PAM cooking spray or equivalent(must not contain corn or canola oil, halogenated hydrocarbons noraromatic content, to prevent inadequate sealing), to inducer hous-ing. (See Fig. 12.) Apply a small bead of G.E. RTV 162, G.E. RTV6702, or Dow-Corning RTV 738 sealant to groove in collectorbox.11. Refer to furnace wiring diagram and reconnect wires toinducer motor and pressure switch or connectors.12. Reconnect pressure tubes to pressure switch. See diagram onmain furnace door for proper location of tubes. Be sure tubesare not kinked. (See Fig. 10.)13. Turn on gas and electrical supplies to furnace.14. Check furnace operation through 2 complete heat operatingcycles. Check area below inducer housing, vent pipe, andcondensate trap to ensure no condensate leaks occur. If leaksare found, correct the problem.FIRE OR EXPLOSION HAZARDFailure to follow the safety warnings exactly could result inserious injury, death, or property damage.Never test for gas leaks with an open flame. Use a commer-cially available soap solution made specifically for thedetection of leaks to check all connections. A fire or explo-sion may result causing property damage, personal injury, orloss of life.15. Check for gas leaks.Fig. 11—Burner FlameA89020BURNER FLAMEBURNERMANIFOLDFig. 12—Gasket on Collector BoxA93081RTVPAM8→→→