Carrier 58TUA Installation, Start-up, And Operating Instructions Manual

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

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Carrier 58TUA Installation, Start-up, And Operating Instructions Manual Manual pdf 10 page image

2-stage heating thermostats. COM, Y/Y2, and G are required forcooling, heat pumps, and some clock thermostats. These must bemade at the 24-v terminal block on the control. (See Fig. 14.)This furnace can be installed with either a single-stage heating ora 2-stage heating thermostat.For single-stage thermostats, connect thermostat W to W/W1 atfurnace control terminal block. (See Fig. 12.) For single-stagethermostats, the control will determine, based on length of previ-ous heating on and off cycles, when to operate in low- andhigh-gas heat for optimum comfort. Setup switch-2 (SW-2) mustbe in the factory-shipped OFF position. See Fig. 15 and Tables 6and 7 for setup switch information.If a 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 fire and allows the2-stage thermostat to select gas heating modes. The W2 fromthermostat must be connected to W2 on control terminal block.(See Fig. 13.)This furnace is equipped with a manual reset limit switch inthe gas control area. The switch will open and shut off powerto the gas valve if a flame rollout or overheating conditionoccurs in the gas control area. DO NOT bypass the switch.Correct inadequate combustion-air supply, component fail-ure, or restricted flue gas passageway before resetting theswitch.Before operating furnace, check each manual reset switch forcontinuity. If necessary, press and release button to reset switch.Step 2—Sequence of OperationUsing schematic diagram in Fig. 16, follow the sequence ofoperation through the different modes. Read and follow diagramvery carefully.NOTE: If power interruption occurs during ″call for heat″ (W/W1or W/W1 and W2) and if the thermostat is still calling for gasTable 5—Electrical DataUNIT SIZEVOLTS—HERTZ—PHASEOPERATINGVOLTAGE RANGE MAXUNITAMPSMINWIREGAGEMAX WIRELENGTH (FT)‡MAX FUSE ORCKT BKR AMPS†Max* Min*040-12 115—60—1 127 104 11.4 14 32 15060-08 115—60—1 127 104 8.2 14 45 15060-12 115—60—1 127 104 10.6 14 34 15080-12 115—60—1 127 104 11.7 14 31 15080-16 115—60—1 127 104 13.4 14 27 15100-12 115—60—1 127 104 10.5 14 35 15100-16 115—60—1 127 104 13.2 14 28 15100-20 115—60—1 127 104 17.7 12 32 20120-16 115—60—1 127 104 13.2 14 28 15120-20 115—60—1 127 104 18.2 12 31 20135-20 115—60—1 127 104 17.4 12 33 20* Permissible limits of the voltage range at which the unit will operate satisfactorily.† Time-delay fuse is recommended.‡ Length shown is as measured along wire path between unit and service panel for maximum 2 percent voltage drop.Fig. 12—Heating and Cooling Application Wiring Diagram 1–Stage Thermostat and Condensing UnitA99071115-V FUSEDDISCONNECTSWITCH(WHEN REQUIRED)JUNCTIONBOXCONTROLBOX24-VTERMINALBLOCKTWO-WIREHEATING-ONLYFIVEWIRE1-STAGE THERMOSTAT TERMINALSFIELD-SUPPLIEDFUSED DISCONNECTCONDENSINGUNITFURNACECOMRW Y R G CGND GNDGND GNDGND GNDFIELD 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