Carrier 48TCA04---A12 appendix Cooling Service Analysis, Problem Cause Remedy

Page 13

Table 1 – Cooling Service Analysis

PROBLEM

CAUSE

REMEDY

 

Power failure.

Call power company.

 

 

 

 

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

 

 

 

Compressor and Condenser

Defective thermostat, contactor, transformer,

Replace component.

or control relay.

Fan Will Not Start.

 

 

 

Insufficient line voltage.

Determine cause and correct.

 

 

 

 

 

Incorrect or faulty wiring.

Check wiring diagram and rewire correctly.

 

 

 

 

Thermostat setting too high.

Lower thermostat setting below room temperature.

 

Faulty wiring or loose connections in

Check wiring and repair or replace.

 

compressor circuit.

 

 

 

 

 

 

Compressor motor burned out, seized, or

Determine cause. Replace compressor.

Compressor Will Not Start But

internal overload open.

 

Condenser Fan Runs.

 

 

Defective run/start capacitor, overload, start

Determine cause and replace.

 

relay.

 

 

 

 

 

 

One leg of three---phase power dead.

Replace fuse or reset circuit breaker. Determine

 

cause.

 

 

 

 

 

 

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and recharge

 

to nameplate.

 

 

 

 

 

 

Defective compressor.

Replace and determine cause.

 

 

 

Compressor Cycles (other

Insufficient line voltage.

Determine cause and correct.

 

 

Blocked condenser.

Determine cause and correct.

than normally satisfying ther-

 

 

Defective run/start capacitor, overload, or start

 

mostat).

Determine cause and replace.

relay.

 

 

 

 

 

 

Defective thermostat.

Replace thermostat.

 

 

 

 

Faulty condenser---fan motor or capacitor.

Replace.

 

 

 

 

Restriction in refrigerant system.

Locate restriction and remove.

 

Dirty air filter.

Replace filter.

 

 

 

 

Unit undersized for load.

Decrease load or increase unit size.

 

 

 

Compressor Operates

Thermostat set too low.

Reset thermostat.

 

 

Low refrigerant charge.

Locate leak; repair and recharge.

Continuously.

 

 

Leaking valves in compressor.

Replace compressor.

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

 

 

 

Condenser coil dirty or restricted.

Clean coil or remove restriction.

 

 

 

 

Dirty air filter.

Replace filter.

 

Dirty condenser coil.

Clean coil.

Excessive Head Pressure.

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

 

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

Condenser air restricted or air short---cycling.

Determine cause and correct.

 

 

 

 

Low refrigerant charge.

Check for leaks; repair and recharge.

Head Pressure Too Low.

 

 

Compressor valves leaking.

Replace compressor.

 

 

 

 

Restriction in liquid tube.

Remove restriction.

 

 

 

 

High head load.

Check for source and eliminate.

Excessive Suction Pressure.

 

 

Compressor valves leaking.

Replace compressor.

 

 

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

 

 

 

Dirty air filter.

Replace filter.

 

Low refrigerant charge.

Check for leaks; repair and recharge.

 

 

 

 

Metering device or low side restricted.

Remove source of restriction.

Suction Pressure Too Low.

 

 

Insufficient evaporator airflow.

Increase air quantity. Check filter and replace if

 

necessary.

 

 

 

 

 

 

Temperature too low in conditioned area.

Reset thermostat.

 

 

 

 

Outdoor ambient below 25˚F.

Install low---ambient kit.

 

 

 

Evaporator Fan Will Not Shut

Time off delay not finished.

Wait for 30---second off delay.

Off.

 

 

 

 

 

Compressor Makes Excessive

Compressor rotating in wrong direction.

Reverse the 3---phase power leads.

Noise.

 

 

 

 

 

48TC

13

Page 12 Page 14
Image 13
Page 12 Page 14
Contents Safety Considerations Table of ContentsRoutine Maintenance Unit Arrangement and AccessGeneral What to do if you smell gasSeasonal Maintenance Supply Fan Belt-Drive Supply FAN Blower SectionCooling Condenser Coil Maintenance and Cleaning RecommendationCondenser Coil Routine Cleaning of Coil Surfaces Periodic Clean Water RinseRemove Surface Loaded Fibers One-Row CoilCleaning the Evaporator Coil Refrigerant System Pressure Access PortsEvaporator Coil Evaporator Coil Metering DevicesPuronr R-410A Refrigerant To Use Cooling Charging ChartsRefrigerant Charge No ChargeSize Designation Nominal Tons Reference Cooling Charging ChartsCooling Charging Charts C08229 C08437 C08438 C08439 Problem Cause Remedy Cooling Service AnalysisTroubleshooting Cooling System Condenser-Fan AdjustmentConvenience Outlets CompressorSystem Smoke DetectorsController Unit Connect Primary TransformerSmoke Detector Locations SensorFiop Smoke Detector Wiring and Response Completing Installation of Return Air Smoke SensorSensor Alarm Test Procedure Sensor Alarm TestController Alarm Test Sensor and Controller TestsDirty Controller Test Procedure Controller Alarm Test ProcedureDirty Sensor Test Procedure To Configure the Dirty Sensor Test OperationDetector Cleaning Troubleshooting GAS Heating System Protective DevicesCompressor Protection Relief DeviceNatural Gas Supply Line Pressure Ranges Fuel Types and PressuresNatural Gas Manifold Pressure Ranges Liquid Propane Supply Line Pressure RangesCombustion-Air Blower Flue Gas PassagewaysCheck Unit Operation and Make Necessary Adjust- ments Cleaning and AdjustmentBurners and Igniters Main BurnersBurner Ignition Limit SwitchLED Error Code Description Orifice ReplacementLED Indication Error Code Description Red LED-Status Orifice Sizes IGC ConnectionsCont. Altitude Compensation* A08-A12 Altitude Compensation* A04-A07LP Orifice Minimum heating entering air temperature Troubleshooting Heating SystemAltitude Compensation* A04-A06 Low NOx Units Problem Cause Remedy Heating Service AnalysisIGC IGC Board LED Alarm CodesPremierLink Controller Premierlinkt ControlPremierLink Wiring Schematic 55 Space Temperature Sensor Wiring PremierLink Sensor Usage Space Sensor Mode56 Internal Connections Thermostat ModeLctb Indoor CO2 Sensor 33ZCSENCO2 Connections PremierLink Filter Switch Connection Recommended Cables RTU-MP Control SystemColor Code Recommendations RTU-MP Multi-Protocol Control Board RTU-MP System Control Wiring Diagram Outputs RTU-MP Controller Inputs and OutputsRTU-MP T-55 Sensor Connections Space Temperature SPT SensorsIAQ Sensor SEN J4-2 COM J4-3 24 VAC Power Exhaust output Connecting Discrete InputsCommunication Wiring Protocols RTU-MP Troubleshooting LEDs on the RTU-MP show the status of certain functions LEDsTroubleshooting Alarms BACnet MS/TP AlarmsRTU-MP Driver Modbus Basic Protocol TroubleshootingManufacture Date Code Name MeaningEconoMi$er IV Component Locations Economizer SystemsEconoMi$er IV Wiring EconoMi$er IV Input/Output Logic EconoMi$erOutdoor Air Lockout Sensor Supply Air Temperature SAT SensorEconoMi$er IV Control Modes Outdoor Dry Bulb ChangeoverOutdoor Enthalpy Changeover Return Air Temperature or Enthalpy Sensor Mounting LocationIndoor Air Quality IAQ Sensor Input Exhaust Setpoint AdjustmentMinimum Position Control Thermostats Damper MovementOccupancy Control Demand Control Ventilation DCVEconoMi$er IV Sensor Usage CO2 Sensor ConfigurationEconoMi$er IV Preparation Differential EnthalpyWiring Diagrams 48TC Typical Unit Wiring Diagram Power A06, 208/230-3-60 48TC Unit Wiring Diagram Control A06 START-UP, General PRE-START-UPMain Burners CoolingHeating Ventilation Continuous FanSTART-UP, Premierlink Controls Field Service TestSTART-UP, RTU-MP Control Perform System Check-OutConfiguration Input InputsSpace Sensor Type Input 1 FunctionBase Unit Controls Cooling, Units Without Economizer Operating SequencesHeating, Units Without Economizer Cooling, Unit With EconoMi$erPremierLink Control Heating With EconoMi$er48TC Available Cooling Stages OAT ≤ SPT 48TC 48TC RTU-MP Sequence of Operation Loadshed Command Gas and Electric Heat UnitsLinkage Modes SchedulingLocal Schedule Always Occupied Default OccupancyBACnet Schedule BAS On/OffEconomizer Power ExhaustIndoor Air Quality Demand Limit Fastener Torque ValuesTorque Values Model Number Nomenclature Appendix I. Model Number SignificanceSerial Number Format Position NumberPhysical Data Cooling Tons Appendix II. Physical Data48TC*A08 48TC*A09 48TC*A12 Physical Data CoolingPhysical Data Heating LOW General Fan Performance Notes Appendix III. FAN PerformanceTon Vertical Supply Ton Horizontal SupplyCFM RPM BHP Medium Static Option High Static Option 48TC**05 48TC**05 Phase Ton Horizontal Supply1493 48TC**05 Phase Ton Vertical Supply1506 14861482 48TC**0648TC**06 Phase Ton Vertical Supply 48TC**06 Phase Ton Horizontal Supply48TC**07 Phase Ton Horizontal Supply1124 11071103 1143 1122 11621099 4971116 1093 11331263 5791247 1273Unit MOTOR/DRIVE Motor Pulley Turns Open Combo Pulley AdjustmentIFM Appendix IV. Electrical DataRange RLA LRA TypeFLA Appendix IV. Electrical DataEFF at IFM RangeRLA LRA FullNOM IFM No P.E Combustion PowerFAN Motor Exhaust Type DISC. SizeNOM Unbalanced 3-Phase Supply VoltageWiring Diagrams Appendix V. Wiring Diagram List48TC*A04 Outdoor Circuiting Appendix VI. Motormaster Sensor LocationsCatalog No 48TC---2SM 48TC*A09/12 Outdoor CircuitingPreliminary Information Unit START-UP Checklist

48TCA04---A12 specifications

The Carrier 48TCA04---A12 is a high-efficiency rooftop air conditioning unit designed for commercial and industrial applications. Known for its reliability and performance, this model features advanced technologies that cater to diverse climate control needs.

One of the standout features of the Carrier 48TCA04---A12 is its excellent energy efficiency, which adheres to the stringent standards set by the U.S. Environmental Protection Agency. The unit utilizes a highly efficient scroll compressor combined with state-of-the-art heat exchanger technology, allowing it to operate with minimal energy consumption while providing powerful cooling capabilities.

The unit comes equipped with a robust and durable design, built to withstand various environmental conditions. Its weather-resistant cabinet is constructed from high-quality materials, ensuring long-lasting performance even in harsh climates. Additionally, the unit features a galvanized steel structure with a powder-coated finish, further enhancing its resistance to corrosion and wear.

In terms of technologies, the Carrier 48TCA04---A12 incorporates advanced controls that promote optimal performance. The unit supports Carrier's smart connectivity options, facilitating remote monitoring and adjustments via smart devices. This feature ensures convenient energy management and allows maintenance teams to access performance data, leading to proactive service interventions.

Another important characteristic of this unit is its quiet operation. The design includes sound-reducing insulation and a well-engineered airflow system, minimizing noise levels to create a more comfortable indoor environment. This is particularly important for commercial spaces such as offices and retail environments, where a tranquil atmosphere is critical for customer satisfaction and productivity.

The Carrier 48TCA04---A12 also offers diverse application flexibility, making it suitable for various locations, from small retail stores to large warehouses. With several tonnage options available, users can select a model that perfectly aligns with their specific cooling needs. Additionally, the unit can be easily integrated with existing HVAC systems, providing a seamless solution for upgrading or retrofitting older installations.

To sum up, the Carrier 48TCA04---A12 rooftop air conditioning unit stands out due to its exceptional energy efficiency, durable construction, advanced technology, and quiet operation, making it a reliable choice for commercial and industrial cooling solutions. Its flexibility and smart technology integrations ensure that it meets a wide range of climate control requirements effectively.
Top Page Image Contents