Carrier AC350 Service Manual

Transport Air ConditioningT--304 Rev A Change 07/09OPERATION AND SERVICEforMODELS AC310 & AC350Rooftop Air Conditioning UnitsWithBT324 Carrier Sut

1--2T--30404/081.2 GENERAL DESCRIPTION1.2.1 Rooftop UnitThe rooftop unit includes the condenser section and the evaporator section (See Figure 1--1).A

1--3T--30404/081234578456133299AC310Dual Loop91. Condenser Coil Assembly2. Receiver3. Service Valve (High Side)4. Filter Drier Upper Support5. Filter

1--4T--30404/0812345124451 Condenser Coil AssemblyReceiver Tank (Part Of Coil Assembly)2 Service Valve3 Filter Drier4 Fan & Motor5 Frame (Aluminum

1--5T--30404/0812344566789Return AirSectionAC310Dual Loop1. Evaporator Coil Assembly2. Heater Coil3. Expansion Valve4. Evaporator Blower Assembly5. Ev

1--6T--30404/081122344685671. Evaporator Coil Assembly2. Heater Coil3. Expansion Valve4. Evaporator Blower/Motor Assembly5. Control Panel6. Heater Lin

1--7T--304Change 07/091.2.6 System Operating Controls And Compo-nentsThesystemisoperatedbyanelectronicthermostattypecontroller and/or manually operate

1--8T--30404/08b. Condenser Fan MotorCondenser MotorPermanent Magnet24 VDC 12 VDCHorsepower (kW) 1/8 (.09)Full Load Amps (FLA) 9 18Operating Speed(RPM

1--9T--30404/0841Driver’sEvaporator123456791011123891 Thermal Expansion Valve2 Liquid Line Sight Glass3 Service Port4 Liquid Line Solenoid5 Evaporator

1--10T--30404/08SUPPLYRETURN112344**1. Heat Coil2. Vehicle Radiator3. Boost Pump4. Heat Solenoid Valve* Optional Hand ValveFigure 1--7 Flow Diagram --

1--11T--30404/08EVAPORATORCONDENSERRelief ValveDash AirLiquid LineDischargeLiquidSuctionCoolantDash AirSuction Line125678910119865Discharge Check Valv

OPERATION ANDSERVICE MANUALTRANSPORTAIR CONDITIONING UNITMODELSAC310 & AC350ROOFTOP AIR CONDITIONING UNITS*CSDD -- BT324 (*Carrier Sutrak Digital

1--12T--30404/08K14MK12MK11M K10MK9M K8M K7M K6MK5M K4M K3M K2MK1MV1V2V3V4V5K13MK4AK3AK2AK1AF1AF2AF3AF4AF1MF2MF3MF4MF5MF6MF7MF8MF13MF14MF15MF16Mfreifr

1--13T--30404/081 V1, Diode, Dash Switch2 V2, Diode, Dash Switch3 V3, Diode, Dash Switch4 V4, Diode, Thermostat, Cooling5 V5, Diode, Thermostat, Heati

1--14T--30404/08UNITRELAYS FOR EVAP. MOTORS RELAYS FOR COND. MOTORSAC310AC350K1M -- K6MK1m -- K4M K7M -- K8MK7M -- K9MTop ViewContact arrangementConne

1--15T--30404/08MOTORPOWERCARRIER CRO MOTOR FAULT BOARDD48RS12MOTORR60T24COND4MOTORMOTORMOTORMOTORMOTORMOTORMOTORMOTORT20D47D46D4512--00524--00R59R58R

2--1T--30404/08SECTION 2OPERATION (MANUAL CONTROLLER)2.1 STARTING, STOPPING AND OPERATINGINSTRUCTIONSThe control switches supplied by Carrier Transpor

2--2T--304 04/082.3 MODES OF OPERATION2.3.1 Temperature ControlTemperature is controlled by maintaining the return airtemperature measured at the retu

2--3T--30404/082.3.8 Evaporator Fan Speed SelectionEvaporator fan speed(s) selection is one method ofcontrolling the cooling and heating throughout th

3--1T--30404/08SECTION 3OPERATION BT324 CONTROLLER3.1 STARTING, STOPPING AND OPERATINGINSTRUCTIONSThe BT324 Carrier Sutrak Digital Display (CSDD) isma

3--2T--30404/0811098765432Figure 3--2 BT324 CSDD ControllerKEYS1. Plus Key2. Minus Key3. Recirculate/Fresh Air Key4. Blower Control Key5. Automatic Cl

3--3T--30404/08However ,theblowersmaybeswitchedtomanualmodeof operation by pressing the blower key.Press the Plus or Minuskeys todefine oneof 5 differ

iT--30404/08TABLE OF CONTENTSPARAGRAPH NUMBER PageSAFETY SUMMARY Safety--1...DESCRIPT

T -3044--104/08SECTION 4TROUBLESHOOTINGTable 4--1 General System Troubleshooting ProceduresINDICATION --TROUBLEPOSSIBLE CAUSESREFERENCESECTION4.1 Syst

4--2T--30404/08Table 4--1 General System Troubleshooting Procedures -- ContinuedINDICATION --TROUBLEPOSSIBLE CAUSESREFERENCESECTION4.4 Abnormal Noise

T -3045--104/08SECTION 5SERVICEWARNINGBesure to observewarnings listed in thesafetysummary in thefrontof thismanual beforeperform-ing maintenance on t

T -3045--204/08CAUTIONThe AC310 & AC350 Rooftop Systems haveR134a service port couplings installed onthe compressor and 1/4 inch flare (Acme)fitti

T -3045--304/085.5 PUMPING THE SYSTEM DOWN OR REMOV-ING THE REFRIGERANT CHARGENOTEToavoiddamagetotheearth’sozonelayer ,usearefrigerantrecoverysystemwh

T -3045--4Change 07/09The presence of moisture in a refrigeration system canhave many undesirable effects. The most common arecopper plating, acid slu

T -3045--504/085.10.2 Checking High Or Low Pressure SwitchesWARNINGDo not use a nitrogen cylinder without a pres-sure regulatorWARNINGDonotuseoxygenin

T -3045--604/085.12 SERVICING THE HEAT VALVEThe heat valve (Figure 5--6) requires no maintenanceunless a malfunction to the internal parts or coil occ

T -3045--704/08Failure to open may be caused by the following:1. Coil burned out or an open circuit to coil connections.2. Improper voltage.3. Defecti

T -3045--804/085.15 REPLACING RETURN AIR FILTERSThe return air filters are located behind the return airgrill, inside the vehicle.The filters should b

iiT--304 04/08TABLE OF CONTENTS Continued:3.4 Operating Instructions BT324 3--2...3.4.1 Displa

T -3045--904/087.1.2.3.4.5.6.4.Figure 5--13 Thermostatic Expansion Valve1..Power HeadAssembly2..Equalizer Connection3..Bulb4..Gasket5..Cage Assembly6.

T -3045--1004/08j. The superheat may cycle from a low to high reading.Monitorthesuperheattakingreadingsevery 3--5min-utes for a total of 5--6 readings

T -3045--1104/08Table 5--1. R-134a Temperature - Pressure ChartTemperatureVacuum°F °C“/hg cm/hg kg/cm@ bar-- 40 -- 40 14.6 49.4 37.08 0.49.35 .37 12.3

6--1T--30404/08SECTION 6ELECTRICAL6.1 INTRODUCTIONThis section includes electrical wiring schematics. Theschematics shown in this section provides inf

6--2T--30404/08CONDENSEREVAPORATORCONTROL PANELVERSION AVERSION BOperation BoardOperation BoardALTERNATORWATER PUMP HEATINGHEATING VALVES1AS2AS3AS1AR1

6--3T--30404/08WHOGOGRDY1A2BKRDBKYEBKBUUHWHX3V4S1AR1NB1N34 5V2V1713RDWHWHYEWHWHRDBNWHK1AU2F1A15A853086 87a8712U5swororWHBUBKGYV51Inside sensorTemperat

6--4T--30404/08Waterpump heatingL P -- -- s w i t c h87a8710AUK878687a85H P -- -- s w i t c hH P -- -- s w i t c hL P -- -- s w i t c hHeating valve30

6--5T--30404/08F01MBATTERY 12 VDC5MMK4MBKBU6WHOGBNF4MWHGNF3MK5M15AK6MBKGNM3M M4M15ABN4308786858586 87301BN-- --BKRD15AM2MM1MGNK3M15AK2MU2F1MU4WHYE+B+F

6--6T--30404/08MK10MBKBU15BKOG15ABNF8MBKGNF7MK11M15AK12MM5MGNK8MM7M M8M15AM6MBNF5MBKYEF6MBNBKRD12BKBUK7M1310MMBNM1415AGNU5U28586 87K9MWHBUWHYEU2U4B+WH

6--7T--30404/0815A10 13 14 15B+15A 15AM15AMMMK14M K15MF13M F14M F15M F16MX1M21M M22M M23M M24MB+U5U2BKBUBKYEU5GNWHGNBUGNYEGNOGOGRDU2U38586873085868730

iiiT--30404/08TABLE OF CONTENTS Continued:5.13 SERVICING THE LIQUID LINE SOLENOID VALVE 5--6...5.13.1 Coil Replace

6--8T--30404/08CONDENSEREVAPORATORCONTROL PANELALTERNATOR WITHDASH SWITCHWATER PUMP HEATINGHEATING VALVEM31MY31AY7M Compressor ClutchConvecti on Heati

6--9T--30404/08CONTROLLERBT324OPTIONOUTSIDE SENSORINSIDE SENSORCONTROL PANELREF: 98--62668--00(RAS)(ATS)5A5A 5A05G -- 05K OPTIONCompressorClutch05GWPH

6--10T--30404/083030303030 30868686868686CONTROL PANEL87a87 85K1M87a 87 85K2M8587a 87K3MK4MK5MK6M87a 87 87a 87 8787a8585 85U1U2U4U3U3a3ABN2xRD 16FmaX2

6--11T--30404/08U1U2UregU415AU4AX16X2897WHRDBURDBUWHGNBUWHCONTROL PANEL+U4AUVdUregUKoUFri1pol.1pol.15A15A 15A 15A15A 15AF13M F14M F15M F16M F17M F18M3

6--12T--30404/08UNITRELAYS FOR EVAP. MOTORS RELAYS FOR COND. MOTORSAC310AC350K1M -- K6MK1m -- K4M K7M -- K8MK7M -- K9MTop ViewContact arrangementConne

6--13T--30404/08HPS -- HIGH PRESSURE SWITCHHSV -- HEATING SOLENOID VALVELPS -- LOW PRESSURE SWITCHWP -- WATER PUMPUPS1 -- UNLOADER PRESSURE SWITCH #1U

6--14T--30404/08Input PowerGroundNight LightAlternator5A5A5ACompressor Failure Signal (Optional)CompressorClutchFreeWheelingDiodePressureSwitchesLoadR

6--15T--30404/08BATTERY24 VDCEVAPORATOR MOTORSINSTALLED BLOWERSAC310AC350M1M -- M8MM1M -- M12MBN6--+30868587a 87K1M K2MK3MK4MK5M K6M308687a 87 85 87a

6--16T--30404/08CONDENSER MOTORSInstalled MotorsAC310AC350M21M -- M24MM21M -- M26MMMMMMMBrownGreenGreyYellowRedX10.2X10.1X10+M++Figure 6--15 Thermosta

6--17T--30404/08Installed In Units With HeatingTEMP. SENSORTHERMOSTATCOOLINGHEATING8587a873086K4A K5A86853087a 87308687a85K3A132X3.432X58964123V6U3111

ivT--304 04/08LIST OF FIGURES Continued:Figure 6--4 Evaporator Motors 1 -- 4 6-- 5...Figure

6--18T--30404/08UNIT WITH 2 COMPRESSORSU33/B1510AF2AX20X51112GNX3.510AF3A21310 7 530868587a87K7AOptionY6AY7AB2FB21FLiquid Line ValvesLP--SwitchHP--Swi

6--19T--30404/08CONTROL PANELEvaporator BlowersVentilation -- 2 StepsX4234758971S1AS2AS3A11355Fresh Air FlapOPTIONClimaVERSION ACONTROL PANELVERSION B

Index --1T--304 04/08INDEXAAir Filters, 5--7Apex Unit, 1--2CCircuit Breaker, 1--8Clutch, 2--3Compressor, 1--6, 1--7Compressor Clutch Control, 2--3Cond

©2008 Carrier Corporation D Printed in U. S. A. 0408Carrier Transport Air Conditioning50 Grumbacher RoadYork P A 17406 USATel: 1--800--673--2431Fax: 1

Safety--1T--30404/08SAFETY SUMMARYGENERAL SAFETY NOTICESThe following general safety notices supplement the specific warnings and cautions appearing e

Safety--2T--304 04/08SPECIFIC WARNINGS AND CAUTIONSWARNINGBe sure to observe warnings listed in the safety summary in the front of this manual before

1--1T--30404/08SECTION 1DESCRIPTION1.1 INTRODUCTIONThis manual contains Operating Instructions, ServiceInstructions and Electrical Data for the Model