Carrier Infinity 24ANB6 Installation Instructions Manual

Contents

Carrier Infinity 24ANB6 Installation Instructions Manual Manual pdf 7 page image

7Disconnect factory provided wires from A, B, C, and D terminals.Using factory provided wires, connect to C and Y on the controlboard for 2 wire thermostat control. A field installed jumper wireis also required between R and Y (See Fig. 14). Connect field 24Vwires to factory provided wires now connected to C and Y and capboth sides or remove unused factory provided wires.Compressor Internal ReliefThe compressor is protected by an Internal Pressure Relief (IPR)which relieves discharge gas into the compressor shell whendifferential between suction and discharge pressure exceeds550--625 psi. The compressor is also protected by an internaloverload attached to motor windings.GENERAL SEQUENCE OF OPERATIONSTANDARD THERMOSTATTurn on power to indoor and outdoor units. Transformer isenergized.On a call for cooling, thermostat makes circuits R--Y and R--G.Circuit R--Y energizes contactor, starting outdoor fan motor andcompressor circuit. R--G energizes indoor unit blower relay,starting indoor blower motor on high speed.NOTE: To achieve the rated system performance, the indoor unitor the thermostat must be equipped with a time delay relay circuit.When thermostat is satisfied, its contacts open, de--energizingcontactor and blower relay. Compressor and motors stop. If indoorunit is equipped with a time--delay relay circuit, the indoor blowerwill run an additional 90 sec to increase system efficiency.CONTROL FUNCTIONSAND SEQUENCE OF OPERATIONThe outdoor unit control system has special functions. Thefollowing is an overview of the control functions.SEQUENCE OF OPERATIONCooling OperationThis product utilizes either a standard indoor thermostat or Infinitycommunication User Interface. With a call for cooling, the outdoorfan and compressor are energized. When the cooling demand issatisfied, the compressor and fan will shut off.NOTE: The outdoor fan motor will continue to operate for oneminute after compressor shuts off, when the outdoor ambient isgreater than or equal to 100_F (37.78_C).Communication and Status Function LightsGreen Communications (COMM) Light (Infinity Controlonly):A green LED (COMM light) on the outdoor board indicatessuccessful communication with the other system products. Thegreen LED will remain OFF until communications is established.Once a valid command is received, the green LED will turn ONcontinuously. If no communication is received within 2 minutes,the LED will be turned OFF until the next valid communication.Amber Status LightAn amber colored STATUS light is used to display the operationmode and fault codes as specified in the troubleshooting section.See Table 3 for codes and definitions.NOTE: Only one fault code will be displayed on the outdoor unitcontrol board (the most recent, with the highest priority).Crankcase Heater OperationThe crankcase heater (when applicable) is energized during the offcycle below 65_F (37.78_C)Outdoor Fan motor OperationThe outdoor unit control energizes outdoor fan any time thecompressor is operating. The outdoor fan remains energized for 15minutes if a pressure switch or compressor thermal protectorshould open. Outdoor fan motor will continue to operate for oneminute after the compressor shuts off when the outdoor ambient isgreater than or equal to 100_F (37.78_C).Time DelaysThe unit time delays include:S Five minute time delay to start cooling operation when there is acall from the thermostat or user interface (there is no bypass ofthis feature in a non--communicating system, in acommunicating system push the UI fan and up buttonssimultaneously for approximately 10 seconds)S When operating the unit with 2 wires, this delay is shortened to10 seconds.S Five minute compressor recycle delay on return from a brownout conditionS Two minute time delay to return to standby operation from lastvalid communications (with Infinity only)S One minute time delay of outdoor fan at termination of coolingmode when outdoor ambient is greater than or equal to 100_F(37.78_C).Utility InterfaceWith Infinity ControlThe input labeled UTIL is active only when a communicatingInfinity Control is used. This input allows a power utility device tointerrupt compressor operation during peak load periods. Seefigure below for wiring connections. When the utility sends asignal to shut the system down, the User Interface will display”CURTAILMENT ACTIVE”.INFINITY BOARDRUTILITY RELAY *UTILITY SIGNALOPEN RELAY* SUPPLIED BY UTILITY PROVIDERUTILA05410Fig. 9 -- Utility InterfaceWith Non--Communicating ThermostatsWhen the utility curtailment interface is used with anon--communicating thermostat, the utility relay should be wired inseries with the Y input.Low Ambient CoolingWhen this unit is required to operate below 55_F (12.78_C) to aminimum of 0 _F (--17.78 _C) outdoor temperature, provisionsmust be made for low ambient operation.Low ambient cooling operation can be accomplished two waysdepending on the control system:S Complete Infinity SystemS Standard non--communicating thermostat24ANB6