Carrier CAS072 Installation, Start-up And Service Instructions Manual

30 Specifications subject to change without notice. CAS-072-153-01SI Rev. ATable 22 — LED Status CodesSTATUS LED STATUS LED DESCRIPTION STATUS LED TROUBLESHOOTING INFORMATIONGreen “POWER” Module has power Supply voltage is present at module terminalsRed “TRIP” LED On SolidThermostat demand signal Y ispresent, but the compressor isnot running.1. Compressor protector is open2. Condensing unit power disconnect is open3. Compressor circuit breaker or fuse(s) is open4. Broken supply wires or connector is not making contact5. Compressor power wires not routed through Comfort Alert6. Compressor contactor has failed openRed “TRIP” LED Flashing The anti-short cycle timer (3 minutes) in module is preventing compressor restart.Module locks out compressor when compressor damaging ALERT code appears.Lockout ALERT codes are noted in the Status LED Description.During a compressor lock out, 24VAC power must be removed from module to manually reset.Yellow “ALERT” LED On SolidA short circuit or over currentcondition exists on PROTterminal.1. Compressor contactor coil shorted2. Electrical load too high for PROT circuit (maximum 1 Amp)3. 24 V AC wired directly to PROT terminalYellow “ALERT” Flash Code 2 System Pressure Trip Dischargepressure out of limits LOCKOUT1. High head pressure2. Condenser coil poor air circulation (dirty, blocked, damaged)3. Condenser fan is not running4. If low pressure switch is open:a. Low refrigerant chargeb. Evaporator blower is not runningc. Evaporator coil is frozend. Faulty metering devicee. Condenser coil is dirtyf. Liquid line restriction (filter drier blocked if present)Yellow “ALERT” Flash Code 3Short Cycling Compressor isrunning only briefly (fourconsecutive cycles of less thanthree minutes each) LOCKOUT1. Loose connection between thermostat Y1 and CADM Y terminal.2. Unit short-cycling on thermostat3. System or control board defectiveYellow “ALERT” Flash Code 4 Locked Rotor LOCKOUT1. Low line voltage to compressor2. Excessive liquid refrigerant in compressor3. Compressor bearings are seizedYellow “ALERT” Flash Code 5 Open Circuit1. Condensing unit power disconnect is open2. Compressor circuit breaker or fuses are open3. Compressor contactor has failed open4. High pressure switch is open and requires manual reset5. Broken supply wires or connector is not making contact6. Unusually long compressor protector reset time due to extreme ambient temperature7. Compressor windings are damagedYellow “ALERT” Flash Code 6 Missing Phase LOCKOUT1. Compressor fuse is open on one phase2. Broken wire or connector on one phase3. Compressor motor winding is damaged4. Utility supply has dropped one phaseYellow “ALERT” Flash Code 7 Reverse Phase LOCKOUT 1. Compressor running backward due to supply phase reversalYellow “ALERT” Flash Code 8 Welded Contractor Compressoralways runs1. Compressor contactor has failed closed2. Thermostat demand signal not connected to moduleYellow “ALERT” Flash Code 9 Low Voltage Control circuit <18VAC1. Control circuit transformer is overloaded2. Low line voltage to compressorTable 23 — CADM TroubleshootingMISWIRED MODULE INDICATION RECOMMENDED TROUBLESHOOTING ACTIONGreen LED is not on,module does not power upDetermine if both R and C module terminals are connected. Verify voltage in present at module’s R and Cterminals.NOTE: The CADM requires a constant nominal 24VAC power supply. The wiring to the module’s R and Cterminals must be directly from the control transformer. The module cannot receive its power from anotherdevice that will interrupt the 24VAC power supply. See Appendix B Wiring Diagrams.Green LED Intermittent,module powers up onlywhen compressor runsDetermine if R and Y terminals are wired in reverse. Verify module’s R and C terminals have a constantsource. See “NOTE” above for details on R and C wiring.TRIP LED is on but systemand compressor check OKVerify Y terminal is wired properly per the CAS wiring diagram (see Appendix B Wiring Diagrams). Verifyvoltage at contactor coil falls below 0.5VAC when off. Verify 24VAC is present across Y and C whenthermostat demand signal is present. If not, R and C are reverse wired.TRIP LED and ALERT LEDflashing together Verify R and C terminals are supplied with 19-28VAC.ALERT Flash Code 3(Compressor Short Cycling)displayed incorrectlyVerify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VACwhen off.ALERT Flash Code 5 or 6(Open Circuit, Missing Phase)displayed incorrectlyCheck that compressor T1 and T3 wires are through module’s current sensing holes. Verify Y terminal isconnected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off.Alert Flash Code 8(Welded Contactor)displayed incorrectlyDetermine if module’s Y terminal is connected. Verify Y terminal is connected to 24VAC at contactor coil.Verify 24VAC is present across Y and C when thermostat demand signal is present. If not, R and C arereverse wired. Verify voltage at contactor coil falls below 0.5VAC when off.