Trane Comprehensive Guide on RAUC Air Conditioner System Pre-Start Procedures and Thermostat Checkout

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System Pre-Start Procedures

10.Measure the voltage again across Terminals R (-) and W (+). The measured voltage should now be approximately 0.2 VDC.

11.Turn the control circuit switch 1S2, in the unit control panel, to the “OFF” position.

12.Remove the wires from Terminals R, B, W, & Y.

13.Measure the resistance across the following pairs of terminals and compare the actual resistance readings with the values shown below:

(1)MEC Terminals R-to-W = 226 ohms

(2)MEC Terminals R-to-B = 432 ohms

(3)MEC Terminals R-to-Y = 226 ohms

14.Reconnect the economizer leads W, R, B and Y to the appropriate terminals on the controller.

15.Turn switches 1S2, 5S1, & 5S2 to the “ON” position to restore power to the control system.

Zone Thermostat Checkout (Honeywell T7067)

1.Open the system control switches 5S1 and 5S2 to disable the Evaporator Fan and Heating system.

2.Close the main power disconnect switch and turn the control circuit switch 1S2, in the unit control panel, “ON”.

WARNING

High Voltage is Present at Terminal Block 1TB1 or Unit Disconnect

Switch 1S1.

To prevent injury or death form electrocution, it is the responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

3.At the Zone Thermostat (6U37), use a digital voltmeter to verify that there is 20 volts DC power between thermostat Terminals 1 & 2. Refer to the illustration in Figure 31 for terminal identification. Refer to Table 12 for the thermostat “voltage output” ramps.

4.To check the “Cooling” output signal, place the voltmeter leads between thermostat Terminals 1 & 4. Refer to Figure 30 and;

a.move the cooling (blue) setpoint lever from right to left. As the cooling setpoint is lowered, the voltage signal should increase and the “Cooling” LED brighten.

b.move the cooling (blue) setpoint lever from left to right. As the cooling setpoint rises, the voltage signal should decrease and the “Cooling” LED dim.

5.To check the “Heating” output signal, place the voltmeter leads between thermostat Terminals 1 & 5. Refer to Figure 30 and;

a.move the heating (red) setpoint lever from left to right. As the heating setpoint rises, the voltage signal should increase and the “Heating” LED brighten.

b.move the heating (red) setpoint lever form right to left. As the heating setpoint lowers, the voltage signal should decrease and the “Heating” LED dim.

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Contents June Remote Split System UnitsOverview of Manual Grounding RequiredEnvironmental Concerns Responsible Refrigerant PracticesTable of Contents SS-SVX09A-EN Unit Nameplate Model Number DescriptionCompressor Nameplate Unit Description EVP Chiller Considerations Unit InspectionNo Step Surface Unit ClearancesInstallation Unit Dimensions & Weight InformationFoundation Installation RAUC-C20 Unit Dimensional Data & Recommended Clearances RAUC-C25 Unit Dimensional Data & Recommended Clearances RAUC-C30 Unit Dimensional Data & Recommended Clearances RAUC-C40 Unit Dimensional Data & Recommended Clearances RAUC-C50 Unit Dimensional Data & Recommended Clearances RAUC-C60 Unit Dimensional Data & Recommended Clearances Bphe 20 Evaporator Chiller Dimensions Bphe 25 Evaporator Chiller Dimensions Bphe 30 Evaporator Chiller Dimensions Bphe 40 Evaporator Chiller Dimensions Bphe 50 Evaporator Chiller Dimensions Bphe 60 Evaporator Chiller Dimensions Typical EVP Chiller Weights & General Data Typical Unit Weights & Point Loading DataRigging and Center-of-Gravity Data Rigging Heavy ObjectsNeoprene Isolators Unit IsolationTypical Neoprene Isolator Selection & Location Leveling the Unit Installation Spring IsolatorsTypical Spring Isolator Selection & Location Shipping FastenersCompressor Shipping Hardware Two Manifolded CompressorsRefrigerant Piping Requirements General Unit RequirementsHazard of Explosion Main Electrical Power Requirements Hazardous VoltageEVP Chilled Water Piping Requirements No Controls Units Ground WireField Installed Control Wiring Requirements Volt Control Wiring All UnitsEVP Chiller Piping Refrigerant Line Components Low Voltage Wiring AC & DC Hazardous VoltageVariable Air Volume VAV Units Constant Volume UnitsThermostatic Expansion Valve TEV Liquid Line Moisture Indicator Sight GlassAccess Valves Ports Liquid Line Solenoid ValvesTypical Placement of Split System piping Components Solenoid Valve & Sight Glass w/Moisture IndicatorUse Type L refrigerant grade copper tubing only Suction Line Interconnecting TubingRefrigerant Piping Suction Line PipingLiquid Line Piping Liquid Line Interconnecting TubingTypical Coil Piping For Dual Circuit Units Evaporator PipingOptional Pressure Gauges Hot Gas Bypass for Commercial Comfort-Cooling ApplicationsFinal Refrigerant Pipe Connections Brazing Procedures Hazard of Explosion and Deadly Gases Leak Testing Procedure Hazard of Explosion Chilled Water Piping Evaporator Water-Pressure Drop Water Pressure Gauges Installation Air VentsChiller Flow Switch Water Temperature SensorTypical Piping Recommendations FreezestatFinal Water Piping Connections Optional Flow Switch IllustrationDisconnect Switch External Handle Factory Mounted Option Field Installed Power WiringMain Unit Power Wiring Hazardous Voltage Calculation #1 MCA, MOP, and RDE Power Wire Sizing and Protection DeviceCustomer Connection Wire Range EquationsElectrical Service Sizing Data Installation Calculation #2 Disconnect Switch Sizing DSSControls Using 115 VAC Hazardous Voltage Field Installed Control Wiring Hazardous VoltageHot Gas Bypass All control options EVP Interlocks EVP Flow control 6S58EVP Circulating Pump Interlock Outside Air Thermostat 5S57Controls using DC Analog Input/Outputs Hazardous Voltage Controls using 24 VAC Hazardous VoltageAC Conductors DC Conductors Economizer Actuator CircuitNo System Control Temperature Control ParametersEconomizer Actuator Circuit Legend Refer to Wiring Notes on p Installation Discharge Air Sensor Honeywell 6RT3 Variable Air Volume Control Honeywell W7100ANight Setback Hazardous Voltage Suction Line ThermostatEVP Chiller Control W7100G Discharge Chilled Water Controller EVP Chiller Remote Panel Chilled Water Temperature Sensor Honeywell 6RT2Outside Air Thermostat 5S57 Field Provided Refer to Wiring Notes on Page p Thermostat Checkout Constant Volume Control HoneywellThermostat Wiring Electronic Zone Thermostat Honeywell T7067T7067 Electronic Zone Thermostat & Q667 Switching Subbase Discharge Air Sensor Honeywell 6RT1 Q667 Switching SubbaseRefer to Wiring Notes on Page p RT1 Discharge Air Sensor Assembly EVP Chiller Applications Compressor DamageSystem Pre-Start Procedures System Evacuation ProceduresTypical Vacuum Pump Hookup System Pre-Start Procedures Standing Vacuum TestEvacuation Time vs. Pressure Rise System Pre-Start Procedures W7100A Discharge Air Controller Zone or Discharge Air Temp Controller Economizer Actuator CheckoutOhms 4200 4000 3800 System Pre-Start Procedures W7100G Chilled Water Controller Master Energy Control Checkout Hazardous Voltage Zone Thermostat Checkout Honeywell T7067 Terminals Zone Thermostat 6U37 Voltage Output rampsOhms Electrical Phasing Voltage ImbalanceVAV W7100A Discharge Air Controller 7U11 Sequence of OperationEconomizer Cycle System Start-Up Chilled Water Temperature Controller 6U11Thermostatic Expansion Valve W7100G Staging Sequence Condenser FansCompressor Crankcase Heaters Low Ambient DampersPump Down Hot Gas Bypass Operation Low Ambient Damper Adjustment Factory or Field InstalledLive Electrical Components System Start-Up Low Ambient ThermostatsEVP Chiller Applications Freezestat Setting200 300 Verifying Proper Supply Fan Rotation Air Over Evaporator ApplicationRotating Components System Airflow MeasurementCompressor Start-Up All Systems Compressor Damage Live Electrical Components Measuring Subcooling SubcoolingMeasuring Superheat Recommended Refrigerant Capacities Pressure Control Switch SettingsMinimum starting Ambient Temperature Compressor OilCompressor Sequence Typical Compressor Locations Ton Pressure Curve System Start-Up System Start-Up Ton Pressure Curve per Circuit 100 101 Recommended Operating Setpoints Final System SetupSample Maintenance Log At Low Ambient Start-Up Scroll Compressor ReplacementCompressor Operational Sounds At ShutdownCompressor Circuit Breaker Data Service & MaintenanceAir Handling Equipment Fuse Replacement DataMonthly Maintenance Fuse Replacement DataCondensing Unit Coil CleaningSystem operation Hazardous PressuresWarranty and Liability Clause Numerics Symbols111 IndexSS-SVX09A-EN

RAUC-C20, RAUC-C40, RAUC-C25, RAUC-C30, RAUC-C60 specifications

Trane, a leader in HVAC solutions, offers innovative air conditioning units designed for superior performance and energy efficiency. Among their advanced products are the Trane RAUC-C30, RAUC-C20, RAUC-C40, RAUC-C60, and RAUC-C50, which cater to various cooling and heating needs in residential and commercial applications.

The RAUC-C series showcases cutting-edge technology, ensuring effective climate control while minimizing energy consumption. These units are equipped with variable-speed compressors, allowing for precise cooling capacities and reduced noise levels during operation. This feature ensures that users can enjoy optimal comfort without the disruptive noise often associated with traditional HVAC systems.

One of the standout technologies used in the RAUC-C series is Trane’s advanced inverter technology. This system intelligently adjusts the compressor speed based on real-time cooling demands, enhancing efficiency and prolonging the unit's lifespan. Additionally, the units come with high SEER (Seasonal Energy Efficiency Ratio) ratings, making them an excellent choice for those looking to lower their energy bills while maintaining a comfortable indoor environment.

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Trane's focus on user-friendly interfaces makes these units easy to operate. The intuitive control systems allow users to customize their cooling preferences easily, providing flexibility to adapt to individual comfort needs.

Overall, the Trane RAUC-C30, RAUC-C20, RAUC-C40, RAUC-C60, and RAUC-C50 stand out for their energy efficiency, advanced technology, durability, and user-focused design. These features make them reliable choices for anyone seeking efficient and effective heating and cooling solutions.