Carrier 58MCB Service And Maintenance Instructions

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

Contents

Carrier 58MCB Service And Maintenance Instructions Manual pdf 7 page image

7FIRE, EXPLOSION, UNIT DAMAGE HAZARDFailure to follow this warning could result in personalinjury, death, or property damage.Gas valve switch MUST be facing forward or tiltedslightly.! WARNING19. Replace burner box cover.20. Turn on gas and electrical supplies to furnace.FIRE OR EXPLOSION HAZARDFailure to follow this warning could result in personalinjury, death or property damage.Never test for gas leaks with an open flame. Use acommercially available soap solution made specificallyfor the detection of leaks to check all connections.! WARNING21. Check for gas leaks.22. Replace main furnace door.Step 4 — Cleaning Heat ExchangersThe following items should be performed by a qualified servicetechnician.Primary Heat ExchangersIf the heat exchangers get an accumulation of light dirt or dust onthe inside, they may be cleaned by the following procedure:NOTE: If the heat exchangers get a heavy accumulation of sootand carbon, both the primary and secondary heat exchangersshould be replaced rather than trying to clean them thoroughly dueto their intricate design. A build--up of soot and carbon indicatesthat a problem exists which needs to be corrected, such as improperadjustment of manifold pressure, insufficient or poor qualitycombustion air, improper vent termination, incorrect size ordamaged manifold orifice(s), improper gas, or a restricted heatexchanger (primary or secondary). Action must be taken to correctthe problem.1. Turn off gas and electrical supplies to furnace.2. Remove main furnace door.UNIT DAMAGE HAZARDFailure to follow this caution may result in furnacecomponent damage.Label all wires prior to disconnection when servicingcontrols. Wiring errors can cause improper and hazardousoperation.CAUTION!3. Disconnect wires or connectors to flame rollout switch, gasvalve, igniter, and flame sensor.4. Disconnect combustion--air intake pipe from intake hous-ing.5. Remove the pressure switch tube from intake housing.6. Remove screws attaching intake housing to burner box, androtate intake housing away from burner box for removal.7. Using backup wrench, disconnect gas supply pipe from fur-nace gas control valve.8. Disconnect pressure tubing from gas valve.9. Remove two screws attaching top filler panel and rotate up-wards to gain access to screws attaching burner box to cellpanel.10. Remove screws attaching burner box to cell panel. (See Fig.6.)NOTE: Burner box, cover, manifold, gas valve, and burnerassembly should be removed as one assembly.11. Clean heat exchanger openings with a vacuum and a softbrush. (See Fig. 8.)NOTE: After cleaning, inspect the heat exchangers to ensure theyare free of all foreign objects that may restrict flow of combustionproducts.PRIMARY HXINLET OPENINGSA96305Fig. 8 -- Cleaning Inlet Openings of PrimaryHeat ExchangersUNIT MAY NOT OPERATEFailure to follow this caution may result in improper orintermittent unit operation.The ground wire from the gas valve MUST be attached tothe burner box attachment screw.CAUTION!12. Reverse items 3 through 10 for reassembly.NOTE: Be sure burner box gasket is installed between burner boxand cell panel. (See Fig. 6.) If gasket is damaged, replace it.NOTE: Inspect combustion--air intake housing. If foamed gasketwas removed, check for any damage. If gasket is damaged in anyway, it must be repaired. To repair, remove damaged gasketsection, apply sealant releasing agent such as PAM cooking sprayor equivalent (must not contain corn nor canola oil, halogenatedhydrocarbons nor aromatic content, to prevent inadequate sealfrom occurring) to burner box and apply a small bead of G.E. RTV162, G.E. RTV 6702, or Dow--Corning RTV 738 sealant to edgeof combustion--air intake housing. (See Fig. 9.)58MCB