York TM8V C Series Installation Manual

Contents

York TM8V C Series Installation Manual Manual pdf 13 page image

5402847-UIM-A-0917Johnson Controls Unitary Products 13In order to use this furnace in full communications (COMM) mode, itMUST be installed with the matching touch-screen CommunicatingControl (wall thermostat) and an outdoor air conditioner or heat pumpwith a fully communicating control.This furnace may be used with the Communicating Thermostat Controland a non-communicating outdoor air conditioner by installing the ACCommunicating Control Board Kit to the outdoor unit. This systemallows full communication between the furnace and thermostat and lim-ited communication to the outdoor unit. See Figure 18.CONTROL WIRING USING COMMUNICATINGCONTROLS (NON-VARIABLE CAPACITY OUTDOORMODELS)Use the wiring diagram above to connect the furnace control, Commu-nicating Control (wall thermostat) and communicating outdoor unit. Besure that all of the “A” terminals are connected together, all of the “B”terminals are connected together, all of the “GND” or “C” terminals areconnected together and all of the “R” terminals are connected together.See Figure 18. When using a fully communicating system, the largescrew terminals (C, G, R, etc.) on the furnace control are not used. Thefour small screw terminals in the terminal block on the end of the fur-nace control should be used.Float Switch InputAn optional switch may be connected to the FLT SWT terminals on thecontrol board. This feature is only functional when used with the Com-munication Control. It is intended for use with a water overflow switch.Auxiliary Switch InputAn optional switch may be connected to the AUX SWT terminals on thecontrol board. This feature is only functional when used with the Com-munication Control. Refer to Communication Control Installation Man-ual.FIGURE 17: Furnace Control Board – Communications ConnectionsCONVENTIONALLOW VOLTAGETSTAT CONNECTIONSCOMMUNICATINGTSTAT CONNECTIONSDIAGNOSTICLIGHTLASTERRORBUTTONCFMINDICATORFLOATSWITCHCONNECTIONTEMPSENSORCONNECTIONSAUXILIARYSWITCHCONNECTIONSHUMIDISTATSELECTIONHI HEATDELAYBLOWEROFF DELAYCONTINUOUSFAN SPEED HEAT PUMPSELECTIONAIRFLOWSELECTIONA+ R C B- A+ R C B-A+ R C B- A+ R C B-COMMUNICATIONSFIGURE 18: Two-stage Furnace with Communicating AC or HPA+RCB-A+RCB-A+RGNDB-ODHUMY1Y/Y2W2RGCTouch ScreenCommunicating controlFurnaceCommunicating controlAir Conditioner/Heat PumpCommunicating controlW/W1IMPORTANTDo not place more than one wire under any single communicationterminal screw (there are four communication terminal screws). Ifmore than one wire must be connected to a terminal screw, attachonly the terminal end of a one wire pigtail no longer than 6“, anduse a wire connector to connect the other end of the pigtail to theother wires. Failure to do this will result in nuisance communicationerror faults. See Figure 19.