Carrier 50TCA04-A07 appendix

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off. Heat staging will resume after a delay to allow the supply-air temperature to drop below the SATHI value.

The maximum number of stages available is dependent on the type of heat and the number of stages programmed in the CONFIG and SERVICE configuration tables. Staging will occur as follows for gas electric units, Carrier heat pumps with a defrost board, or cooling units with electric heat:

For Heating PID STAGES = 2

HEAT STAGES = 1 (50% capacity) - energize HS1. HEAT STAGES = 2 (100% capacity) - energize HS2.

For Heating PID STAGES = 3 and AUXOUT = HS3 HEAT STAGES = 1 (33% capacity if) - energize HS1 HEAT STAGES = 2 (66% capacity) - energize HS2 HEAT STAGES = 3 (100% capacity) - energize HS3

Staging will occur as follows For heat pump units with AUXOUT configured as reversing valve:

For Heating PID STAGES = 2 and AUXOUT = Reversing Valve Heat (the H3_EX_RV output will stay energized until there is a cool demand) HEAT STAGES = 1 (50% capacity) shall energize CMP1, CMP2, RVS.

HEAT STAGES = 2 (100% capacity) shall energize HS1 and HS2.

Heating PID STAGES = 3 and AUXOUT = Reversing Valve Heat (the H3_EX_RV output will stay energized until there is a cool demand)

HEAT STAGES = 1 (33% capacity if) shall energize CMP1, CMP2, RVS

HEAT STAGES = 2 (66% capacity) shall energize HS1 HEAT STAGES = 3 (100% capacity) shall energize HS2

If AUXOUT is configured for Reversing Valve Cool, then the H3_EX_RV contact will be deenergized when there is a demand for heating. The heat stages will be cycled to temper the SAT so that it will be between the SPT and the SPT + 10_F (SPT < SAT < (SPT + 10_F)) if:

S the number of heat stages calculated is zero

Sthe OAT < 55_F

S an IAQ sensor is installed

S the IAQ Minimum Damper Position > minimum damper position

Sand the SAT < SPT -10_F.

There is also a SAT tempering routine that will act as SAT low limit safety to prevent the SAT from becoming too cold should the economizer fail to close. One stage of heating will be energized if it is not in the Cooling or Free Cooling mode and the OAT is below 55_F and the SAT is below 40_F. It will deenergize when the SAT > (SPT + 10_F).

Indoor Air Quality — If the optional indoor air quality (IAQI) sensor is installed, the PremierLink controller will maintain indoor air quality within the space at the user configured differential setpoint (IAQD) in the CONFIG

configuration table. The setpoint is the difference between the IAQI and an optional outdoor air quality sensor (OAQ). If the OAQ is not present then a fixed value of 400 ppm is used. The actual space IAQ setpoint (IAQS) is calculated as follows:

IAQS = IAQD + OAQ (OAQ = 400 ppm if not present)

As air quality within the space changes, the minimum position of the economizer damper will be changed also thus allowing more or less outdoor air into the space depending on the relationship of the IAQI to the IAQS. The IAQ algorithm runs every 30 seconds and calculates IAQ minimum position value using a PID loop on the IAQI deviation from the IAQS. The IAQ minimum position is then compared against the user configured minimum position (MDP) and the greatest value becomes the final minimum damper position (IQMP). If the calculated IAQ minimum position is greater than the IAQ maximum damper position (IAQMAXP) decision in the SERVICE configuration table, then it will be clamped to IAQMAXP value.

If IAQ is configured for low priority, the positioning of the economizer damper can be overridden by comfort requirements. If the SPT > OCSP + 2.5 or the SPT < OHSP - 2.5 then IAQ minimum position becomes 0 and the IQMP = MDP. The IAQ mode will resume when the SPT ≤ OCSP + 1.0 and SPT ≥ OHSP - 1.0.

If IAQ is configured for high priority and the OAT < 55_F and the SAT < (SPT - 10_F), the algorithm will enable the heat stages to maintain the SAT between the SPT and the SPT + 10_F.

IAQ Pre-Occupancy Purge — This function is designed to purge the space of airborne contaminants that may have accumulated 2 hours prior to the beginning of the next occupied period. The maximum damper position that will be used is temperature compensated for cold whether conditions and can be pre-empted by Temperature Compensated Start function. For pre-occupancy to occur, the following conditions must be met:

S IAQ Pre-Occupancy Purge option is enabled in the CONFIG configuration table

S Unit is in the unoccupied state S Current Time is valid

S Next Occupied Time is valid

S Time is within 2 hours of next Occupied period

S Time is within Purge Duration (user-defined 5 to 60 minutes in the CONFIG configuration table)

S OAT Reading is available

If all of the above conditions are met, the economizer damper IQMP is temporarily overridden by the pre-occupancy damper position (PURGEMP). The PURGEMP will be set to one of the following conditions based on atmospheric conditions and the space temperature:

S If the OAT ≥ NTLO (Unoccupied OAT Lockout Temperature) and OAT < 65_F and OAT is less than or

50TC

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Contents Safety Considerations Table of ContentsGeneral Unit Arrangement and AccessRoutine Maintenance Seasonal MaintenanceSupply Fan Belt-Drive Supply FAN Blower SectionSupply-Fan Pulley Adjustment Bearings Adjustable-Pitch Pulley on MotorCondenser Coil Condenser Coil Maintenance and Cleaning RecommendationCooling Two-Row Coils Cleaning Condenser CoilRefrigerant Charge Refrigerant System Pressure Access PortsPuronr R-410A Refrigerant Evaporator CoilCoreMax Access Port Assembly To Use Cooling Charging ChartsCooling Charging Charts Cooling Charging ChartsCooling Charging Charts Condenser-Fan Location Troubleshooting Cooling SystemCompressor Filter DrierProblem Cause Remedy Cooling Service AnalysisSmoke Detectors Convenience OutletsSensor SystemController Smoke Detector Locations Completing Installation of Return Air Smoke SensorReturn Air Sensor Operating Position Fiop Smoke Detector Wiring and ResponseDirty Sensor Test Sensor and Controller Tests Sensor Alarm TestController Alarm Test Dirty Controller TestChanging the Dirt Sensor Test Detector CleaningRemote Test/Reset Station Dirty Sensor Test Cleaning the Smoke DetectorControl or Indicator Description IndicatorsAlarm State Detector IndicatorsProtective Devices TroubleshootingCondenser Fan Motor Protection Electric HeatersRelief Device Control CircuitTypical Single Point Installation Completing Heater InstallationPremierLink Controller Premierlinkt ControlPremierLink Wiring Schematic Temp Resistance 55 Space Temperature Sensor WiringOutdoor AIR Return AIR Temperature Enthalpy SensorPremierLink Sensor Usage TB1 Terminal Field Connection Input Signal Space Sensor ModeThermostat Mode Field Connection Input SignalLctb Outside and Return Air Enthalpy Sensor Wiring Tions Indoor CO2 Sensor 33ZCSENCO2 ConnecManufacturer CCN BUS Wire CCN Plug PIN Color NumberRecommended Cables Color Code RecommendationsPremierLink CCN Bus Connections Economizer SystemsRUN Inputs OutputsEconoMi$er IV Control Modes Supply Air Temperature SAT SensorEconoMi$er Outdoor Air Lockout SensorOutdoor Enthalpy Changeover Differential Dry Bulb ControlIndoor Air Quality IAQ Sensor Input Enthalpy Changeover SetpointsThermostats Exhaust Setpoint AdjustmentMinimum Position Control Damper MovementEconoMi$er IV Sensor Usage CO2 Sensor ConfigurationDemand Control Ventilation DCV Single Enthalpy DCV Demand Controlled Ventilation and Power ExhaustEconoMi$er IV Preparation Differential EnthalpyPRE-START-UP Wiring DiagramsEconoMi$er IV Troubleshooting Completion START-UP, Premierlink Controls START-UP, GeneralOperating Sequence, Base Unit Controls Memory ResetPerform System Check-Out Initial Operation and TestOperating Sequence, PremierLink Control 50TC Number Stages Economizer Available Cooling StagesOAT ≤ SPT 50TC 50TC Linkage Modes Loadshed Command Gas and Electric Heat UnitsFastener Torque Values Torque Values 50TC Typical Unit Wiring diagram Power A0650TC Unit Wiring Diagram Control A06 Position Number Typical Designates Appendix I. Model Number SignificanceModel Number Nomenclature Serial Number FormatPhysical Data Cooling Tons Appendix II. Physical DataGeneral Fan Performance Notes Appendix III. FAN PerformanceCFM RPM BHP Ton Horizontal SupplyTon Vertical Supply 554 Standard Static Option1206 11701165 1225 121550TC**05 Phase Ton Horizontal Supply 765 724Phase Ton Horizontal Supply 974 1067 822 927 1018872 973 1061 923 1019Unit MOTOR/DRIVE Motor Pulley Turns Open Combo Pulley AdjustmentAppendix IV. Electrical Data FLA Appendix IV. Electrical DataMCA/MOCP Determination no C.O. or Unpwrd C.O 78/89 MCA/MOCP Determination no C.O. or Unpwrd C.O.152 159 Wiring Diagrams Appendix V. Wiring Diagram List50TC*A04 Outdoor Circuiting Appendix VI. Motormaster Sensor LocationsAppendix VI. cont Motormaster Sensor Locations Catalog No 50TC---1SM Remove and Store in Job File START-UP ChecklistPressures Cooling Mode

50TCA04-A07 specifications

The Carrier 50TCA04-A07 is a prominent model from Carrier, a leader in the heating, ventilation, and air conditioning (HVAC) industry. Designed for commercial applications, this unit exemplifies advanced technology and reliability, catering to a wide array of cooling needs.

One of the most notable features of the Carrier 50TCA04-A07 is its high efficiency. With a cooling capacity that suits various settings, it is engineered to provide excellent performance with minimal energy consumption. The unit achieves impressive Seasonal Energy Efficiency Ratio (SEER) ratings, which not only reduce operational costs but also lower the environmental impact.

The Carrier 50TCA04-A07 employs state-of-the-art inverter technology. This innovation allows the compressor to operate at varying speeds, adjusting its output according to the cooling demand. Consequently, the system can maintain optimal comfort levels while using less energy. Additionally, the inverter technology contributes to quieter operation, making it a suitable choice for environments where noise is a concern.

Durability is a hallmark of the Carrier 50TCA04-A07. Constructed with robust materials, this model is designed to withstand harsh conditions and ensure long-term reliability. The unit is equipped with corrosion-resistant components, extending its lifespan and maintaining performance quality over time.

Another significant characteristic of the Carrier 50TCA04-A07 is its advanced control system. The integrated control panel provides easy access to performance settings and monitoring capabilities. Users can effortlessly adjust temperatures and modes, ensuring a customizable climate. Furthermore, compatibility with smart building management systems enhances operational efficiency and real-time monitoring.

Regarding safety features, the Carrier 50TCA04-A07 is equipped with multiple sensors and automated responses to prevent overheating and ensure safe operation. These safety mechanisms not only protect the unit but also contribute to the overall safety of the installation environment.

In summary, the Carrier 50TCA04-A07 is a highly efficient, durable, and technologically advanced HVAC solution for commercial spaces. Its innovative features, including inverter technology, robust construction, and smart control systems, set it apart in the market, making it a reliable choice for businesses seeking to optimize their climate control needs while minimizing energy consumption and operational costs.
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