Carrier 58DXT Operating Instructions Manual

Also see for 58DXT: User's information manual Service and maintenance instructions

Contents

Carrier 58DXT Operating Instructions Manual Manual pdf 10 page image

After fully assembling the vent connector to the furnace flue collar,securely fasten the vent connector to the collar with 2 field-supplied, corrosion-resistant, sheet metal screws located 180degrees apart and midway up the collar.The horizontal portion of the venting system shall maintain aminimum of 1/4-in. upward slope per linear ft and it shall berigidly supported every 5 ft or less with hangers or straps to ensurethat there will be no movement after installation.Step 9—Start-Up, Adjustment, and Safety CheckGENERALThe furnace must have a 115-v power supply properly connectedand grounded. Correct polarity must be maintained to enable gasheating operation.The gas service pressure must not exceed 0.5 psig (14-in. wc), andbe no less than 0.16 psig (4.5-in. wc).Thermostat wire connections at R and W/W1 are the minimumrequired for gas heating operation. W2 must be connected for2-stage heating thermostats. C OM, Y/Y2, and G are required forcooling, heat pumps, and some other thermostats. Follow manu-facturer’s instructions supplied with thermostat. These must bemade at 24-v terminal block on control. (See Fig. 10.)This furnace can be installed with either single-stage heating or2-stage heating thermostat.For single-stage thermostats, connect thermostat W to W/W1 atfurnace control terminal block. (See Fig. 11.) For single-stagethermostats the control determines, based on length of previousheating on and off cycles, when to operate in low- and high-gasheat for optimum comfort. Setup Switch-2 (SW-2) must be in thefactory-shipped OFF position. See Fig. 13 and Tables 6 and 7 forsetup switch information.If 2-stage heating thermostat is to be used, move SW-2 to ONposition at end of furnace installation. This overrides built-incontrol process for selecting high and low stage and allows 2-stagethermostat to select gas heating modes. The W2 from thermostatmust be connected to W2 on furnace control terminal block. (SeeFig. 12.)Before operating furnace, check each manual reset switch forcontinuity. If necessary, press and release button to reset switch.This furnace is equipped with 2 manual reset limit switches ingas control area. The switches will open and shut off powerto gas valve if a flame rollout or an overheating conditionoccurs in gas control area. DO NOT bypass switches. Correctinadequate combustion air supply, component failure, re-stricted flue gas passageway before resetting switches.SEQUENCE OF OPERATIONUsing the schematic diagram follow sequence of operation throughdifferent modes. (See Fig. 14.) Read and follow wiring diagramvery carefully.Table 5—Electrical DataUNITSIZEVOLTS—HERTZ—PHASEOPERATINGVOLTAGE RANGE MAXUNITAMPSMINWIREGAGEMAX WIRELENGTHFT‡MAXIMUMFUSE ORCKT BKR AMPS†Max* Min*060-12 115—60—1 127 104 10.5 14 35 15080-16 115—60—1 127 104 14.2 14 26 15100-20 115—60—1 127 104 17.9 12 32 20* Permissible limits of the voltage range at which the unit will operate satisfactorily.† Time-delay fuse is recommended.‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.Fig. 11—Heating and Cooling Application Diagram With 1-Stage Thermostat and 1-Stage Condensing UnitA97443115-V FUSEDDISCONNECTSWITCH(WHEN REQUIRED)JUNCTIONBOXCONTROLBOX24-VTERMINALBLOCKTWO-WIREHEATING-ONLYFIVEWIRE1-STAGE THERMOSTAT TERMINALSFIELD-SUPPLIEDFUSED DISCONNECTCONDENSINGUNITFURNACECOMRW Y R G CGNDGNDFIELD 24-V WIRINGFIELD 115-, 208/230-, 460-V WIRINGFACTORY 24-V WIRINGFACTORY 115-V WIRING208/230- OR460-VTHREEPHASE208/230-VSINGLEPHASEWHTBLKWHTBLKW/W1W2Y/Y2GNOTES: 1. Connect Y-terminal as shown for proper operation.2. Some thermostats require a "C" terminal connection as shown.3. If any of the original wire, as supplied, must be replaced,use same type or equivalent wire.10