Trane SCXG-SVX01B-EN manual Unit Control Components, RTM Module Board Standard on all Units

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general

Operation information

Unit Control Components

The Modular Series IntelliPakself- contained unit is controlled by a microelectronic control system that consists of a network of modules. These modules are referred to as unit control modules (UCM). In this manual, the acronym UCM refers to the entire control system network.

These modules perform specific unit functions using proportional/integral control algorithms. They are mounted in the unit control panel and are factory wired to their respective internal compo- nents. Each module receives and interprets information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request; i.e., economizing, mechanical cooling, heating, ventilation. Following is a detailed description of each module’s function.

RTM Module Board - Standard on all Units

The RTM responds to cooling, heating, and ventilation requests by energizing the proper unit components based on information received from other unit modules, sensors, remote panels, and customer supplied binary inputs. It initiates supply fan, exhaust fan, exhaust damper, inlet guide vane positioning or variable frequency drive output, and airside economizer operation based on that information.

Reference the RTM points list.

Note: Emergency stop and external auto/ stop, stop the unit immediately, emergency stop generates a manual reset diagnostic that must be reset at the unit human interface. External auto-stop will return the unit to the current operating mode when the input is closed, so this input is auto reset.

RTM Remote Economizer Minimum Position

The remote minimum position potentiometer, BAYSTAT023A, provides a variable resistance (0-270 ohms) to adjust the economizer minimum position from 0 to 100% when connected to the economizer remote minimum position

input of the RTM. The RTM must be selected as the source for economizer minimum position. If the RTM is the selected source for economizer minimum position, and if a valid resistance per Table O-GI-1 is provided to the RTM remote minimum position input, the OA cfm compensation function will not operate, even if enabled. “Default” is the only possible source for economizer minimum position when using the OA cfm compensation function.

Table O-GI-1. Economizer remote minimum position input resistance

input

economizer

resistance

min. position

0 - 30 ohms

0 %

30 - 240 ohms

0-100 % (linear)

240 - 350 ohms

100 %

> 350 ohms

N/A *

*Note: A resistance greater than 350 ohms is assumed to be an open circuit. The system will use the default minimum position value.

RTM Analog Outputs

The RTM has two 0-10 vdc outputs: one for the inlet guide vane option and one for the economizer option. These outputs provide a signal for one or two damper actuators. There are no terminal strip locations associated with these wires. They go directly from pins on the RTM circuit board to the actuator motor.

RTM Binary Outputs

The RTM has an output with pressure switch proving inputs for the supply fan. There is a 40 second delay from when the RTM starts the supply fan until the fan proving input must close. A fan failure diagnostic will occur after 40 seconds. This is a manual reset diagnostic, and all heating, cooling, and economizer functions will shut down. If this proving input is jumped, other nuisance diagnostics will occur. If the proving input fails to close in 40 seconds, the economizer cycles to the minimum position. This is a manual reset diagnostic. External control of the fan is not recommended.

VAV Drive Max Output

This is a single-pole, double-throw relay rated at a maximum voltage of 24 vac, two amps. The relay contacts of this relay switch when theunit goes from the occupied mode to the unoccupied mode bymeans of the occupied binary input. The contacts will stay switched during the

unoccupied and morning warmup mode. They will return to the position shown on the unit wiring diagram when the unit returns to the occupied mode. This binary output signals theVAV boxes or other terminal devices to go full open.

RTM Alarm Relay

This is a single pole, double throw relay rated at a maximum voltage of 24 vac, two amps max. Relay contacts can be programmed from the unit human interface. This relay can be programmed to pick up on any one or group of diagnostics from the unit human interface.

Status/Annunciator Output

The status annunciator output is an internal function within the RTM module on CV andVAV units. It provides:

a. diagnostic and mode status signals to the remote panel (LEDs) and to the Human Interface.

b. control of the binary alarm output on the RTM.

c. control of the binary outputs on the GBAS module to inform the customer of the operational status and/or diagnostic conditions.

Occupied/Unoccupied Inputs There are four ways to switch to occupied/unoccupied:

1.Field-supplied contact closure hardwired binary input to the RTM

2.Programmable night setback zone sensor

3.Tracer Summit

4.Factory-mounted time clock

VAV Changeover Contacts

These contacts are connected to the RTM when daytime heating onVAV units with internal or external hydronic heat is required. Daytime (occupied) heating switches the system to a CV unit operation. Refer to the unit wiring diagram for the field connection terminals in the unit control panel. The switch must be rated at 12 ma @ 24 VDC minimum.

External Auto/Stop Switch

A field-supplied switch may be used to shut down unit operation. This switch is a binary input wired to the RTM. When opened, the unit shuts down immediately and can be cancelled by closing the switch. Refer to the unit wiring diagrams (attached to the unit control panel) for proper connection terminals. The switch

SCXG-SVX01B-EN

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Contents Models JO and later design sequenceHazardousVoltage w/Capacitors IntroductionHazard Identification Special Note on Refrigeration EmissionsContents Refrigerant Handling Procedures Features and BenefitsModular Series Self-Contained Unit Components Unit Nameplate Installation informationModel Number Description Model Number Description ScwgDigit 24 Unit Connection Digit 31 Compressor ServiceValvesDigit 22 Unit Finish DigitModel Number Description Pswg Self-Contained Ship-WithAccessory Model Number DescriptionAfter-ShipmentAccessory Model Number Shipping Package Receiving and HandlingInstallation Preparation TopView CCRC/CIRC 20, 29 ServiceAccessTable I-PC-1. Service and code clearance requirements SectionLifting Equipment Capacity Rigging and Unit HandlingFigure I-PC-7.Assembled modular unit proper rigging Unit Handling ProcedureUnits with Thermostat Only Split-Apart Unit AssemblyIntelliPak UnitsUCM Only Remove panels FML, FMM, and FMRFigure I-PC-9 How to assemble the split apart modular unit External Unit Isolation Pre-Installation ChecklistSkid Removal Left-side view DimensionsWeights SCWG/SIWG Dimensions,Left-side View Right-side view Top view SCRG/SIRG Dimensions,SCRG/SIRGWeight, lbs Detail Dimensions, Dimensions WeightsCCRC/CIRC Refrigerant connections, CCRC/CIRC Air-cooled condenser dimensions & weight, in-lbsCCRC/CIRC -Air-Cooled Condenser CCRC/CIRC Electrical connections,Hot Water Coil Hot water coil dimensions & weight, in-lbsSteam Coil Steam coil dimensions, in-lbsFlexible Horizontal Discharge Plenum Electric heat coil dimensions & weight, in-lbsElectric Heat Coil Waterside Economizer Waterside economizer weight, in-lbsDetail a Detail B Airside economizer dimensions & weight, in-lbsAirside Economizer Result in death or serious injury Mounting Requirements Dimensions Weights VFDVariable Frequency Drive Option VFD Control and LineVoltageVariable Frequency Drive with Bypass Electrical Installation ProcedureVFD with bypass dimensions, Hazardous Voltage w/Capaci- tors Mechanical SpecificationsDuct Connections Water PipingTable I-MR-1. Water Connection Sizes Waterside Piping ArrangementsHazard of Explosion and Deadly Gases Brazing ProceduresRefrigerant Piping Air-Cooled Units Only Equipment Damage Unit Wiring DiagramsSupply PowerWiring Live Electrical ComponentsSelection Procedures Shipping bracket Installation requirementsPre-Startup Procedures Supply Fan IsolatorsFigure I-PR-3. Correct plenum insulation placement Unit Handling Airside Economizer InstallationUnit Installation Field Wiring ConnectionsTransducer Location Static PressureTransducer Installation VAV units onlyInstalling theTransducer Figure I-PR-7. Installing the waterside economizer Waterside Economizer Installation ProcedureTubing assemblies for waterside econo Mizer left-hand piping Waterside Economizer Ship-Separate Parts List Unit Structural Integrity Hydronic Coil InstallationInstallation Procedure Table I-PR-2.Available Electric Heat kW Electric Heat InstallationElectric Heat CoilWiring Procedure BAYSENS077* Description Standard with All IntelliPak UnitsZone Sensor Options for IntelliPak Control Units CV Unit Zone Sensor OptionsBAYSENS073 Description CV andVAV Unit Zone Sensor OptionsVAV Unit Zone Sensor Option BAYSENS074 DescriptionMounting the Subbase Zone Sensor InstallationWiring Mounting LocationRight Mounting Directly to the Wall Mounting to Junction Box Programmable Zone Sensors ConstantVolume Zone Sensor BAYSENS019 DescriptionVariable AirVolume Zone Sensor BAYSENS020B Description Airflows from adjacent zones or other units Programmable Zone Sensor InstallationTime Clock Option Time Clock InstallationTime Clock Installation Checklist Wiring theTimeclockLocation Recommendations Remote Human Interface Panel InstallationHuman Interface HI Panel Remote Human Interface PanelWall Mounting the RHI Panel ProcedureMounting the Remote Human Interface RHI Panel Pre-startup Interprocessor Communication Bridge ModuleWiring Wiring the Remote Human InterfaceLowVoltage AC FieldWiring Connections Communication Link ShieldedTwisted PairWiringPre-Startup Checklist Connecting toTracer SummitProgrammable Zone Sensor Options Installation programmingDuring Programming Indicates Heat supply air Cool supply air Warmup temperatureKeypad Operation Up and Down Button Arrows Temporary Manual OverrideTime Button Keypad LockoutFigure I-P-6.Temporary manual override menu screen Temporary Override Run ModeTable I-P-1. Zone sensor BAYSENS019 option menu settings Figure I-P-7.Temporary manual override run mode screenOff Flashing Remote Panel Indicator Signals From UCM to ZSMIntelligent Copy To use Intelligent CopyFigure I-P-9.BAYSENS019 complete icon display Icon DescriptionsFigure I-P-10.BAYSENS020 complete icon display To review and change programs Setting theTimeProgramming theTime Clock Option ProgrammingCompressor Damage Installation startupUnit Startup Procedures Pre-Startup ChecklistCompressor Amp Draw Startup LogEvaporator Air Cooled Units Water Cooled UnitsPoints List -TracerTMLCI-I Module Points List RTM ModulePoints List Gbas Module Points List Ecem ModuleRTM Module Board Standard on all Units Unit Control ComponentsTable O-GI-3. RTM setpoint analog inputs Table O-GI-2. RTM sensor resistance vs. temperatureVAV Box Option Ventilation Override Module VOM Option Human Interface Module Standard on all UnitsHeat Module Supply fan on Supply fan VFD on if equipped Purge sequence DGeneric BuildingAutomation System Module Option Table O-GI-7. Gbas input voltage corresponding setpoints Table O-GI-6. Gbas analog input setpointsWaterside Components Figure O-GI-3. Basic water piping, constant water flow UnitAirside Components General Operation information Air-Cooled Condensers Airside Economizer Interface with Comparative EnthalpyProperWaterTreatment Input Devices and System FunctionsFilter Switch Return AirTemperature SensorSupply Air Temperature Sensor Supply Airflow Proving SwitchesTracer Summit System Operation operationControl Sequences Operation Unoccupied Sequence of OperationTimed Override Activation ICS Morning WarmupCycling Capacity Morning Warmup MWU Occupied Sequence Electric Heat Supply Air Setpoint Reset VAV Units OnlyMechanical Cooling Water-Cooled Units OnlyTable O-SO-1. Compressor Stages CompressorsCompressor Lead/Lag Operation Table O-SO-2. Pressure cutouts Step ControlEvaporator Coil Frost Protection Operation Service Valve OptionTable M-GI-1. SCWG/SIWG/SCRG/SIRG General Maintenance Data Maintenance informationAir Filters Maintenance proceduresMaintenance Procedures Remove all standing water Inspecting and Cleaning the Drain PanInspecting and Cleaning the Fan Fan Drive Supply FanVariable Frequency Drive VFD Table M-MP-3. Compatible Fan Bearing Grease Fan BearingsTable M-MP-1. Baldor Fan Bearing Lubrication Schedule Table M-MP-2.AO Smith Bearing Lubrication ScheduleTable M-MP-4. Fan shaft bearing torques Fan BeltTensionDeflection = belt span/64 Belt Adjusting BeltTensionRefrigerant Evacuation Refrigerant SystemConfined Space Hazards R407c Refrigerant LeakTestingMotor Winding Damage Use of Pressure Regulator Valves GaugesMaintenance Inlet GuideVanes Coil Fin CleaningProper Coil CleaningAgent Coil Freezeup Piping Components Chemical Cleaning of Condenser and Economizer CoilFlow Switch Maintenance Cleaning the Flow SwitchAnnual Maintenance Maintenance Periodic ChecklistsMonthly Checklist Semi-Annual MaintenanceSystem Checks Check the zone thermostat settingsOperating Procedures Common Unit Problems and SolutionsDiagnostics Maintenance diagnosticsEntering Water Temp Sensor Fail Heat Module Auxilliary Temperature Sensor FailEmergency Stop Entering Cond WaterTemp Sensor FailMCM Communications Failure Mode Input FailureLow Air Temp Limit Trip Low Pressure Control Open Circuit 1, 2, 3, orTemp. Sensor Failure NSB Panel ZoneTemperature Sensor FailureCheck Field/unit wiring between RTM and NSB Panel Humidity Sensor FailureRTM Zone Sensor Failure RTM Data Storage ErrorLCI-I Module Comm Failure Supply Fan VFD Bypass EnabledProblemThe LCI-I has lost communication withTracer Summit Supply Fan FailureWSM Communications Fail Render all HI keystrokes ineffectiveVOM Communications Failure Water Flow Fail WSM Mixed AirTemp Sensor Fail114 115 Literature Order Number

SCXG-SVX01B-EN specifications

The Trane SCXG-SVX01B-EN is an advanced variable refrigerant flow (VRF) system designed to provide efficient and flexible heating and cooling solutions for commercial and residential applications. This system exemplifies Trane's commitment to innovation, energy efficiency, and ease of installation, making it a standout choice in the industry.

One of the main features of the SCXG-SVX01B-EN is its ability to deliver precise temperature control across multiple zones. The system utilizes a modular design that allows for the connection of multiple indoor units to a single outdoor unit, enabling simultaneous heating and cooling in different areas of a building. This zoned comfort not only enhances occupant satisfaction but also contributes to energy savings by allowing for targeted climate control where it is most needed.

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The unit's compact design simplifies installation, making it suitable for both retrofit projects and new constructions. The flexible piping layout supports various configurations, allowing easy adaptation to the building's architecture. The model also incorporates intelligent controls, offering a user-friendly interface that enhances operational flexibility and promotes energy management.

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