Carrier 48TCA04---A12 appendix Connecting Discrete Inputs, Power Exhaust output

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48TC

Alarm state is reset when the smoke detector alarm condition is cleared and reset at the smoke detector in the unit.

Connecting Discrete Inputs

Filter Status

The filter status accessory is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 59 and Fig. 60 for wire terminations at J5.

Fan Status

The fan status accessory is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be

configured for fan status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 59 and Fig. 60 for wire terminations at J5.

Remote Occupancy

The remote occupancy accessory is a field-installed accessory. This accessory overrides the unoccupied mode and puts the unit in occupied mode. When installing this accessory, the unit must be configured for remote occupancy by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote Occupancy and normally open (N/O) or normally closed (N/C).

Also set MENU→Schedules→occupancy source to DI on/off. Input 8 or 9 is recommended for easy of installation. Refer to Fig. 59 and Table 21 for wire terminations at J5.

Power Exhaust (output)

Connect the accessory Power Exhaust contactor coil(s) per Fig. 66.

Power Exhaust

PEC

TAN

J11-3

LCTB

THERMOSTAT

GRA C

C08464

Fig. 66 - RTU-MP Power Exhaust Connections

Space Relative Humidity Sensor - The RH sensor is not used with 48TC models at this time.

Communication Wiring - Protocols

General

Protocols are the communication languages spoken by control devices. The main purpose of a protocol is to communicate information in the most efficient method possible. Different protocols exist to provide different kinds of information for different applications. In the BAS application, many different protocols are used, depending on manufacturer. Protocols do not change the function of a controller; just make the front end user different.

The RTU-MP can be set to communicate on four different protocols: BACnet, Modbus, N2, and LonWorks. Switch 3 (SW3) on the board is used to set protocol and baud rate. Switches 1 and 2 (SW1 and SW2) are used to set the board’s network address. See Fig 67 for the switch setting per protocol. The 3rd party connection to the RTU-MP is through plug J19. Refer to the RTU-MP 3rd Party Integration Guide for more detailed information on protocols, 3rd party wiring, and networking.

NOTE: Power must be cycled after changing the SW1-3 switch settings.

SW3 Protocol Selection

PROTOCOL

DS8

DS7

DS6

DS5

DS4

DS3

DS2

DS1

BACnet MS/TP

Unused

OFF

OFF

OFF

ON

OFF

Select Baud

Select Baud

(Master)

 

 

 

 

 

 

 

 

Modbus

Unused

OFF

OFF

ON

ON

OFF

Select Baud

Select Baud

(Slave)

 

 

 

 

 

 

 

 

N2

Unused

OFF

OFF

OFF

ON

ON

OFF

OFF

(Slave)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LonWorks

Unused

ON

ON

OFF

ON

OFF

OFF

OFF

NOTE:

 

 

 

 

 

 

 

 

DS = Dip Switch

 

 

 

 

 

 

 

 

BACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE

DS2

DS1

9600

OFF

OFF

19,200

ON

OFF

38,400

OFF

ON

76,800

ON

ON

C07166

Fig. 67 - RTU-MP SW3 Dip Switch Settings

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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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