Carrier 58CTA Installation And Service Instructions Manual

Also see for 58CTA: Product data Installation, start-up, operating and service and maintenance instructions

Carrier 58CTA Installation And Service Instructions Manual Manual pdf 43 page image

SERVICE AND MAINTENANCE PROCEDURESFIRE, INJURY, OR DEATH HAZARDFailure to follow this warning could result in possible damageto this equipment, serious personal injury, or death.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.ELECTRICAL SHOCK, FIRE OR EXPLOSIONHAZARDFailure to follow this warning could result in personal injuryor death, or property damage.Before servicing, disconnect all electrical power to furnace.Verify proper operation after servicing.ELECTRICAL OPERATION HAZARDFailure to follow this caution may result in improper unitoperation or failure of unit components.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 WIRINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.There may be more than one electrical supply to the furnace.Check accessories and cooling unit for additional electricalsupplies that must be shut off during furnace servicing.The electrical ground and polarity for 115-v wiring must beproperly maintained. Refer to Fig. 22 for field wiring informationand to Fig. 56 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. 30.) 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 bloweraccess door. The furnace control LED is either ON continuously,rapid flashing, or a code composed of 2 digits. The first digit is thenumber of short flashes, the second digit is the number of longflashes.For an explanation of status codes, refer to service label located onblower access door or Fig. 55, and the troubleshooting guide whichcan be obtained from your distributor.See Fig. 60 for a brief Troubleshooting guide.For Controls with an Amber LEDThe stored status codes will NOT be erased from the controlmemory, if 115- or 24-v power is interrupted. The control willstore up to five (5) status codes.Table 13–Orifice Size and Manifold Pressure for Gas Input Rate(Tabulated Data Based On 22,000 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 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5625 46 3.6/1.6 46 3.7/1.6 46 3.8/1.7 45 3.8/1.6650 47 3.8/1.6 46 3.4/1.5 46 3.6/1.5 46 3.7/1.6675 47 3.5/1.5 47 3.6/1.6 47 3.7/1.6 46 3.4/1.5700 48 3.7/1.6 48 3.8/1.7 47 3.5/1.5 47 3.6/1.6725 48 3.5/1.5 48 3.6/1.6 48 3.7/1.6 48 3.8/1.7* Orifice numbers 43 are factory installed41→→→→