Carrier 48TCA04---A12 appendix Flue Gas Passageways, Combustion-Air Blower

Page 24

48TC

This switch also prevents operation when the propane tank level is low which can result in gas with a high concentration of impurities, additives, and residues that have settled to the bottom of the tank. Operation under these conditions can cause harm to the heat exchanger system. Contact your fuel supplier if this condition is suspected.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat exchanger:

1.Remove the combustion blower wheel and motor as- sembly according to directions in Combustion-Air Blower section. See Fig. 31.

2.Remove the flue cover to inspect the heat exchanger.

3.Clean all surfaces as required using a wire brush.

Combustion-Air Blower

Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating

season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

To access burner section, slide the sliding burner partition out of the unit.

To inspect blower wheel, shine a flashlight into draft hood opening. If cleaning is required, remove motor and wheel as follows:

1.Slide burner access panel out.

2.Remove the 7 screws that attach induced-draft motor housing to vestibule plate. (See Fig. 31.)

3.The blower wheel can be cleaned at this point. If ad- ditional cleaning is required, continue with Steps 4 and 5.

4.To remove blower from the motor shaft, remove 2 setscrews.

5.To remove motor, remove the 4 screws that hold the motor to mounting plate. Remove the motor cooling fan by removing one setscrew. Then remove nuts that hold motor to mounting plate.

6.To reinstall, reverse the procedure outlined above.

Regulator

Heater Tube

Regulator Gasket Seal Strips, Sponge Rubber

Assembly

Baffle Assembly

 

(Low NOx only)

 

Retainer

 

Support

 

Insulation

 

Assembly

 

Wind Cap Assembly

 

(shown inverted,

 

as shipped)

 

Flue Baffle (Low NOx only)

Inducer Fan-Motor

Assembly

Burner Assembly

C08227

Fig. 31 - Heat Exchanger Assembly

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Contents Table of Contents Safety ConsiderationsUnit Arrangement and Access Routine MaintenanceGeneral What to do if you smell gasSeasonal Maintenance Supply FAN Blower Section Supply Fan Belt-DriveCondenser Coil Maintenance and Cleaning Recommendation CoolingCondenser Coil Periodic Clean Water Rinse Routine Cleaning of Coil SurfacesRemove Surface Loaded Fibers One-Row CoilRefrigerant System Pressure Access Ports Cleaning the Evaporator CoilEvaporator Coil Evaporator Coil Metering DevicesTo Use Cooling Charging Charts Puronr R-410A RefrigerantRefrigerant Charge No ChargeCooling Charging Charts Size Designation Nominal Tons ReferenceCooling Charging Charts C08229 C08437 C08438 C08439 Cooling Service Analysis Problem Cause RemedyCondenser-Fan Adjustment Troubleshooting Cooling SystemConvenience Outlets CompressorSmoke Detectors SystemController Unit Connect Primary TransformerSensor Smoke Detector LocationsCompleting Installation of Return Air Smoke Sensor Fiop Smoke Detector Wiring and ResponseSensor Alarm Test Sensor Alarm Test ProcedureController Alarm Test Sensor and Controller TestsController Alarm Test Procedure Dirty Controller Test ProcedureDirty Sensor Test Procedure To Configure the Dirty Sensor Test OperationDetector Cleaning Troubleshooting Protective Devices GAS Heating SystemCompressor Protection Relief DeviceFuel Types and Pressures Natural Gas Supply Line Pressure RangesNatural Gas Manifold Pressure Ranges Liquid Propane Supply Line Pressure RangesFlue Gas Passageways Combustion-Air BlowerCleaning and Adjustment Check Unit Operation and Make Necessary Adjust- mentsBurners and Igniters Main BurnersLimit Switch Burner IgnitionOrifice Replacement LED Error Code DescriptionLED Indication Error Code Description Red LED-Status IGC Connections Orifice SizesAltitude Compensation* A04-A07 Cont. Altitude Compensation* A08-A12LP Orifice Troubleshooting Heating System Minimum heating entering air temperatureAltitude Compensation* A04-A06 Low NOx Units Heating Service Analysis Problem Cause RemedyIGC Board LED Alarm Codes IGCPremierlinkt Control PremierLink ControllerPremierLink Wiring Schematic 55 Space Temperature Sensor Wiring Space Sensor Mode PremierLink Sensor UsageThermostat Mode 56 Internal ConnectionsLctb Indoor CO2 Sensor 33ZCSENCO2 Connections PremierLink Filter Switch Connection RTU-MP Control System Recommended CablesColor Code Recommendations RTU-MP Multi-Protocol Control Board RTU-MP System Control Wiring Diagram RTU-MP Controller Inputs and Outputs OutputsSpace Temperature SPT Sensors RTU-MP T-55 Sensor ConnectionsIAQ Sensor SEN J4-2 COM J4-3 24 VAC Connecting Discrete Inputs Power Exhaust outputCommunication Wiring Protocols RTU-MP Troubleshooting LEDs LEDs on the RTU-MP show the status of certain functionsTroubleshooting Alarms Alarms BACnet MS/TPRTU-MP Driver Basic Protocol Troubleshooting ModbusManufacture Date Code Name MeaningEconomizer Systems EconoMi$er IV Component LocationsEconoMi$er IV Wiring EconoMi$er EconoMi$er IV Input/Output LogicSupply Air Temperature SAT Sensor Outdoor Air Lockout SensorEconoMi$er IV Control Modes Outdoor Dry Bulb ChangeoverReturn Air Temperature or Enthalpy Sensor Mounting Location Outdoor Enthalpy ChangeoverExhaust Setpoint Adjustment Indoor Air Quality IAQ Sensor InputMinimum Position Control Damper Movement ThermostatsOccupancy Control Demand Control Ventilation DCVCO2 Sensor Configuration EconoMi$er IV Sensor UsageEconoMi$er IV Preparation Differential EnthalpyWiring Diagrams 48TC Typical Unit Wiring Diagram Power A06, 208/230-3-60 48TC Unit Wiring Diagram Control A06 PRE-START-UP START-UP, GeneralCooling Main BurnersHeating Ventilation Continuous FanField Service Test START-UP, Premierlink ControlsSTART-UP, RTU-MP Control Perform System Check-OutConfiguration Inputs InputSpace Sensor Type Input 1 FunctionOperating Sequences Base Unit Controls Cooling, Units Without EconomizerHeating, Units Without Economizer Cooling, Unit With EconoMi$erHeating With EconoMi$er PremierLink Control48TC Available Cooling Stages OAT ≤ SPT 48TC 48TC Loadshed Command Gas and Electric Heat Units RTU-MP Sequence of OperationLinkage Modes SchedulingAlways Occupied Default Occupancy Local ScheduleBACnet Schedule BAS On/OffPower Exhaust EconomizerIndoor Air Quality Fastener Torque Values Demand LimitTorque Values Appendix I. Model Number Significance Model Number NomenclatureSerial Number Format Position NumberAppendix II. Physical Data Physical Data Cooling TonsPhysical Data Cooling 48TC*A08 48TC*A09 48TC*A12Physical Data Heating LOW Appendix III. FAN Performance General Fan Performance NotesTon Horizontal Supply Ton Vertical SupplyCFM RPM BHP Medium Static Option High Static Option 48TC**05 Phase Ton Horizontal Supply 48TC**0548TC**05 Phase Ton Vertical Supply 14931506 148648TC**06 148248TC**06 Phase Ton Horizontal Supply 48TC**06 Phase Ton Vertical SupplyPhase Ton Horizontal Supply 48TC**071107 11241103 1143 1122 1162497 10991116 1093 1133579 12631247 1273Pulley Adjustment Unit MOTOR/DRIVE Motor Pulley Turns Open ComboAppendix IV. Electrical Data IFMRange RLA LRA TypeAppendix IV. Electrical Data FLAIFM Range EFF atRLA LRA FullCombustion Power NOM IFM No P.EFAN Motor Exhaust Type DISC. SizeUnbalanced 3-Phase Supply Voltage NOMAppendix V. Wiring Diagram List Wiring DiagramsAppendix VI. Motormaster Sensor Locations 48TC*A04 Outdoor Circuiting48TC*A09/12 Outdoor Circuiting Catalog No 48TC---2SMUnit START-UP Checklist Preliminary Information

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.
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