Carrier 50TCA04-A07 appendix Operating Sequence, PremierLink Control

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outdoor-air dampers closed to maintain the proper supply-air temperature.

HEATING, UNITS WITH ECONOMI$ER IV — When the room temperature calls for heat, the heating controls are energized as described in the Heating, Units Without Economizer section.

ECONOMIZER IN OCCUPIED MODE — The economizer logic will be energized when the unit IFC is energized. The economizer damper will open to the minimum position setting and remain open until the IFC is de-energized.

ECONOMIZER IN UNOCCUPIED MODE — The economizer damper will remain closed during Unoccupied Mode periods.

Operating Sequence, PremierLink Control

THERMOSTAT MODE — If the PremierLink controller is configured for Thermostat mode (TSTAT), it will control only to the thermostat inputs on J4. These inputs can be overridden through CCN communication via the CV_TSTAT points display table. When in this mode, the fire safety shutdown (FSD) input cannot be used, so any fire/life safety shutdown must be physically wired to disable the 24 vac control circuit to the unit.

Indoor Fan — The indoor fan output will be energized whenever there is 24 vac present on the G input. The indoor fan will be turned on without any delay and the economizer damper will open to its minimum position if the unit has a damper connected to the controller. This will also occur if the Premier-Link controller has been configured for electric heat or heat pump operation.

Cooling — For cooling operation, there must be 24 vac present on G. When G is active, the PremierLink controller will then determine if outdoor conditions are suitable for economizer cooling when an economizer damper is available. A valid OAT, SPT (CCN space temperature) and SAT (supply air temperature) sensor MUST be installed for proper economizer operation. It recommended that an outdoor or differential enthalpy sensor also be installed. If one is not present, then a jumper is needed on the ENTH input on J4, which will indicate that the enthalpy will always be low. Economizer operation will be based only on outdoor air dry bulb temperature. The conditions are suitable when: enthalpy is low, OAT is less than OATL High Lockout for TSTAT, and OAT is less than OATMAX, the high setpoint for free cooling. The default for OATL is 65_F. The default for OATMAX is 75_F.

When all of the above conditions are satisfied and all the required sensors are installed, the PremierLink controller will use the economizer for cooling. One of three different control routines will be used depending on the temperature of the outside air. The routines use a PID loop to control the SAT to a supply air setpoint (SASP) based on the error from setpoint (SASPSAT). The SASP is determined by the routine.

If an economizer is not available or the conditions are not met for the following economizer routines below, the

compressors 1 and 2 will be cycled based on Y1 and Y2 inputs respectively.

Any time the compressors are running, the PremierLink controller will lock out the compressors if the SAT becomes too low. These user configurable settings are found in the SERVICE configuration table:

Compressor 1 Lockout at SAT < SATLO1 (50 to 65_F) (default is 55_F)

Compressor 2 Lockout at SAT < SATLO2 (45 to 55_F) (default is 50_F)

After a compressor is locked out, it may be started again after a normal time-guard period and the supply-air temperature has increased at least 8_F above the lockout setpoint.

Routine No. 1: If the OAT ≤ DXLOCK (OAT DX lockout temperature) and DX Cooling Lockout is enabled when Y1 input is energized, the economizer will be modulated to maintain SAT at the Supply Air Setpoint (SASP) = SATLO1 + 3_F (Supply Air Low Temp lockout for compressor 1). When Y2 is energized, the economizer will be modulated to control to a lower SASP = SATLO2

+3_F (Supply Air Low Temp lockout for compressor no.

2). Mechanical cooling is locked out and will not be energized.

Routine No. 2: If DXLOCK (or DX Cooling Lockout is disabled) < OAT ≤ 68_F when Y1 input is energized, the economizer will be modulated to maintain SAT at SASP = SATLO1 + 3_F. If the SAT > SASP + 5_F and the economizer position > 85% then the economizer will close the to minimum position for three minutes or until the SAT > 68_F. The economizer integrator will then be reset and begin modulating to maintain the SASP after stage one has been energized for 90 seconds.

When Y2 is energized, the economizer will be modulated to control to a lower supply air setpoint SASP= SATLO2

+3_F If the SAT > SASP + 5_F it will close the economizer to minimum position for 3 minutes, reset the integrator for the economizer, then start modulating the economizer to maintain the SASP after the stage two has been on for 90 seconds. This provides protection for the compressor against flooded starts and allow refrigerant flow to stabilize before modulating the economizer again. By using return air across the evaporator coil just after the compressor has started allows for increased refrigerant flow rates providing better oil return of any oil washed out during compressor start-up.

Routine No. 3: If the OAT > 68_F and the enthalpy is low and the OAT <SPT then the economizer will open to 100% and compressors 1 and 2 will be cycled based on Y1 and Y2 inputs respectively. If any of these conditions are not met the economizer will go to minimum position.

If there is no call for heating or cooling, the economizer, if available, will maintain the SASP at 70_F.

Heating — For gas or electric heat, HS1 and HS2 outputs will follow W1 and W2 inputs respectively. The fan will also be turned on if it is configured for electric heat.

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 MotorCooling Condenser Coil Maintenance and Cleaning RecommendationCondenser Coil 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 OutletsController SystemSensor 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 WiringPremierLink Sensor Usage Temperature Enthalpy SensorOutdoor AIR Return AIR 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 MovementDemand Control Ventilation DCV CO2 Sensor ConfigurationEconoMi$er IV Sensor Usage Single Enthalpy DCV Demand Controlled Ventilation and Power ExhaustEconoMi$er IV Preparation Differential EnthalpyEconoMi$er IV Troubleshooting Completion Wiring DiagramsPRE-START-UP 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 Fastener Torque Values Loadshed Command Gas and Electric Heat UnitsLinkage Modes 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 PerformanceTon Vertical Supply Ton Horizontal SupplyCFM RPM BHP 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 Pressures Cooling Mode START-UP ChecklistRemove and Store in Job File

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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