Carrier 58CVA Installation, Start-up, Operating And Service And Maintenance Instructions

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Carrier 58CVA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 37 page image

4. Cycle test furnace with room thermostat.5. Check operation of accessories per manufacturer’s instruc-tions.6. Review User’s Guide with owner.7. Attach literature packet to furnace.SERVICE AND MAINTENANCE PROCEDURESELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARDFailure to follow safety warnings exactly, could result indangerous operation, serious injury, death or property dam-age.Improper servicing could result in dangerous operation,serious injury, death or property damage.-Before servicing, disconnect all electrical power to furnace.-When servicing controls, label all wires prior to disconnect-ing. Reconnect wires correctly.-Verify proper operation after servicing.The ability to properly perform maintenance on this equip-ment requires certain knowledge, mechanical skills, tools, andequipment. If you do not possess these, do not attempt toperform any maintenance on this equipment other than thoseprocedures recommended in the User’s Manual.Label all wires prior to disconnection when servicing con-trols. Wiring errors can cause improper and dangerousoperation.Step 1—IntroductionGENERALThese instructions are written as if the furnace is installed in anupflow application. An upflow furnace application is where theblower is located below the combustion and controls section of thefurnace, and conditioned air is discharged upward. Since thisfurnace can be installed in any of the 4 positions shown in Fig. 4,you must revise your orientation to component location accord-ingly.ELECTRICAL CONTROLS AND WIRINGThere may be more than 1 electrical supply to the unit. Checkaccessories and cooling unit for additional electrical suppliesThe electrical ground and polarity for 115-v wiring must beproperly maintained. Refer to Fig. 22 for field wiring informationand to Fig. 51 for furnace wiring information.NOTE: If the polarity is not correct, the STATUS LED on thecontrol will flash rapidly and prevent the furnace from heating.The control system also requires an earth ground for properoperation of the control and flame-sensing electrode.The 24-v circuit contains an automotive-type, 3-amp fuse locatedon the control. (See Fig. 32.) Any shorts of the 24-v wiring duringinstallation, service, or maintenance will cause this fuse to blow. Iffuse replacement is required, use ONLY a 3-amp fuse. The controlLED will display status code 24 when fuse needs to be replaced.Proper instrumentation is required to service electrical controls.The control in this furnace is equipped with a Status Code LED(Light-Emitting Diode) to aid in installation, servicing, andtroubleshooting. It can be viewed through the sight glass in blowerTABLE 11–(Tabulated Data Based On 21,000 Btuh High-Heat/14,500 Btuh for Low-Heat Per Burner,Derated 4 Percent For Each 1000 Ft Above Sea Level)ALTITUDERANGE(FT)AVG GASHEAT VALUEAT ALTITUDE(BTU/CU FT)SPECIFIC GRAVITY OF NATURAL GAS0.58 0.60 0.62 0.64OrificeNo.ManifoldPressureOrificeNo.ManifoldPressureOrificeNo.ManifoldPressureOrificeNo.ManifoldPressureU.S.A. Only9001to10,000600 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8 45 3.7/1.8625 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7650 47 3.4/1.6 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8675 48 3.6/1.7 48 3.8/1.8 47 3.4/1.6 47 3.5/1.7700 48 3.4/1.6 48 3.5/1.7 48 3.6/1.7 48 3.7/1.8725 49 3.7/1.8 49 3.8/1.8 48 3.4/1.6 48 3.5/1.7* Orifice numbers 43 are factory installedFig. 49—Amp Draw Check With AmmeterA96316R Y W G10 TURNSTHERMOSTAT SUBBASETERMINALS WITHTHERMOSTAT REMOVED(ANITICIPATOR, CLOCK, ETC.,MUST BE OUT OF CIRCUIT.)HOOK-AROUNDAMMETEREXAMPLE: 5.0 AMPS ON AMMETER10 TURNS AROUND JAWS = 0.5 AMPS FOR THERMOSTATANTICIPATOR SETTINGFROM UNIT 24-VCONTROL TERMINALS36