Trane SCXG-SVX01B-EN manual Low Air Temp Limit Trip, Low Pressure Control Open Circuit 1, 2, 3, or

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Maintenance diagnostics

designated the heat module auxillary temperature input as their input are disabled.

Reset Required: (PAR) An automatic reset occurs after the heat module auxillary temperature input returns to its allowable range for 10 seconds.

Heat Module Comm Failure Problem: The RTM has lost communication with the heat module.

Check: Check field/unit wiring between RTM and heat module.

Reason for Diagnostic: The RTM has lost communication with the heat module.

UCM Reaction: An “all heat off” request is sent to the heat operation function.

If the unit has staged gas or electric heat, all heat module outputs will be zeroed and deenergized.

If the unit has hydronic heat or chilled water installed, the unit will turn off the supply fan and close the outside air damper upon the occurrance of a heat module comm failure. A failsafe function in the heat module will cause all water valves to be set to 100% to provide full water flow. Unless used for switching purposes (air handlers with chilled water and mod gas, or chilled water and hydronic heat) all binary outputs will be deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

L

Low Air Temp Limit Trip

Problem: The low air temp limit has tripped. (Units with steam or hot water heating, or air handlers with chilled water cooling)

Reason for Diagnostic: A low air temp limit trip is detected continuously for more than one second. This can occur if the hydronic heat low air temp limit input closes for > 1 second, or if the chilled water low air temp limit trip input opens

for > 1 second. On units with both hydronic heat and chilled water, both low air temp limit inputs are active, and the unit will respond in the same manner regardless of which input is used.

UCM Reaction: The UCM will initiate the following actions;

a. An “open all water valves”request is issued to the heat module function, causing any steam, hot water, or chilled water valves on the unit to open.

b. An “all heat off” request is issued to the heat control function.

c. A “fan off” request is sent to the supply fan control function.

d. A “close damper” request is sent to the economizer actuator control function.

Reset Required: (PMR) A manual reset is required after the low air temp limit trip condition clears. The diagnostic can be reset at the unit mounted human interface, byTracer Summit, or by cycling power to the RTM.

Low Pressure Control Open - Circuit 1, 2, 3, or 4

Problem: The Low Pressure Control (LPC) for Ckt #1, 2, 3, or 4 is open.

Check: State of refrigerant charge for ckt #1, 2, 3, or 4.

Reason for Diagnostic: The Ckt # 1 LPC input is detected open as described in the compressor protection function.

UCM Reaction: A “Lockout Ckt # 1, 2, 3, or 4” request is issued to the compressor staging control function.

Reset Required: (PMR) A manual reset is required anytime after the diagnostic is set. The diagnostic can be reset by the human interface,Tracer Summit, or by cycling power to the RTM.

M

Manual Reset SA Static Press Limit Problem: The supply air static pressure went too high for the third consecutive time.

Reason for Diagnostic: The auto reset

supply air static pressure limit diagnostic has occurred for the third time while the unit is operating in occupied mode.

UCM Reaction: A "supply air pressure shutdown" signal is sent to the following functions;

a. Compressor staging control, b. Economizer actuator control, c. Heat operation,

d. Supply fan control, e. IGV/VFD control, f. Exhaust fan control

g. Exhaust actuator control

Reset Required: (PMR) A manual reset is required and can be accomplished at the HI,Tracer Summit, or by cycling power to the RTM.

MCM Communications Failure

Problem: The RTM has lost communication with the MCM.

Check: Check field/unit wiring between RTM and MCM.

Reason for Diagnostic: The RTM has lost communications with the MCM.

UCM Reaction: A “Lockout” request is sent to the compressor staging control function. And a failsafe function in the MCM will cause all MCM outputs to be zeroed and deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Mode Input Failure

Problem: The RTM mode input is out of range.

Check: Sensor resistance should be between 1 ohm and 40 ohms. If so, check field/unit wiring between sensor and RTM.

Reason for Diagnostic: The mode input signal on the RTM is out of range (resistance < 1 ohm or resistance > 40 ohms).

UCM Reaction: The system mode reverts to the default (HI set) system mode.

Reset Required: (INFO) An automatic reset

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SCXG-SVX01B-EN

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Contents JO and later design sequence ModelsIntroduction Hazard IdentificationSpecial Note on Refrigeration Emissions HazardousVoltage w/CapacitorsContents Features and Benefits Refrigerant Handling ProceduresModular Series Self-Contained Unit Components Installation information Unit NameplateModel Number Description Scwg Model Number DescriptionDigit 31 Compressor ServiceValves Digit 22 Unit FinishDigit Digit 24 Unit ConnectionSelf-Contained Ship-WithAccessory Model Number Description Model Number Description PswgAfter-ShipmentAccessory Model Number Receiving and Handling Shipping PackageInstallation Preparation ServiceAccess Table I-PC-1. Service and code clearance requirementsSection TopView CCRC/CIRC 20, 29Rigging and Unit Handling Lifting Equipment CapacityUnit Handling Procedure Figure I-PC-7.Assembled modular unit proper riggingSplit-Apart Unit Assembly IntelliPak UnitsUCM OnlyRemove panels FML, FMM, and FMR Units with Thermostat OnlyFigure I-PC-9 How to assemble the split apart modular unit Pre-Installation Checklist Skid RemovalExternal Unit Isolation Dimensions WeightsSCWG/SIWG Dimensions, Left-side viewSCRG/SIRG Dimensions, SCRG/SIRGWeight, lbsLeft-side View Right-side view Top view Dimensions Weights Detail Dimensions,CCRC/CIRC Air-cooled condenser dimensions & weight, in-lbs CCRC/CIRC -Air-Cooled CondenserCCRC/CIRC Electrical connections, CCRC/CIRC Refrigerant connections,Hot water coil dimensions & weight, in-lbs Hot Water CoilSteam coil dimensions, in-lbs Steam CoilElectric heat coil dimensions & weight, in-lbs Electric Heat CoilFlexible Horizontal Discharge Plenum Waterside economizer weight, in-lbs Waterside EconomizerAirside economizer dimensions & weight, in-lbs Airside EconomizerDetail a Detail B Dimensions Weights VFD Variable Frequency Drive Option VFDControl and LineVoltage Result in death or serious injury Mounting RequirementsElectrical Installation Procedure VFD with bypass dimensions,Variable Frequency Drive with Bypass Mechanical Specifications Duct ConnectionsWater Piping Hazardous Voltage w/Capaci- torsWaterside Piping Arrangements Table I-MR-1. Water Connection SizesBrazing Procedures Refrigerant Piping Air-Cooled Units OnlyHazard of Explosion and Deadly Gases Unit Wiring Diagrams Supply PowerWiringLive Electrical Components Equipment DamageSelection Procedures Installation requirements Pre-Startup ProceduresSupply Fan Isolators Shipping bracketFigure I-PR-3. Correct plenum insulation placement Airside Economizer Installation Unit InstallationField Wiring Connections Unit HandlingStatic PressureTransducer Installation VAV units only Installing theTransducerTransducer Location Waterside Economizer Installation Procedure Figure I-PR-7. Installing the waterside economizerTubing assemblies for waterside econo Mizer left-hand piping Waterside Economizer Ship-Separate Parts List Hydronic Coil Installation Installation ProcedureUnit Structural Integrity Electric Heat Installation Electric Heat CoilWiring ProcedureTable I-PR-2.Available Electric Heat kW Standard with All IntelliPak Units Zone Sensor Options for IntelliPak Control UnitsCV Unit Zone Sensor Options BAYSENS077* DescriptionCV andVAV Unit Zone Sensor Options VAV Unit Zone Sensor OptionBAYSENS074 Description BAYSENS073 DescriptionZone Sensor Installation WiringMounting Location Mounting the SubbaseRight Mounting Directly to the Wall Mounting to Junction Box ConstantVolume Zone Sensor BAYSENS019 Description Variable AirVolume Zone Sensor BAYSENS020B DescriptionProgrammable Zone Sensors Programmable Zone Sensor Installation Airflows from adjacent zones or other unitsTime Clock Installation Time Clock Installation ChecklistWiring theTimeclock Time Clock OptionRemote Human Interface Panel Installation Human Interface HI PanelRemote Human Interface Panel Location RecommendationsProcedure Mounting the Remote Human Interface RHI PanelWall Mounting the RHI Panel Pre-startup Wiring the Remote Human Interface LowVoltage AC FieldWiring ConnectionsCommunication Link ShieldedTwisted PairWiring Interprocessor Communication Bridge ModuleWiringConnecting toTracer Summit Pre-Startup ChecklistInstallation programming Programmable Zone Sensor OptionsHeat supply air Cool supply air Warmup temperature During Programming IndicatesKeypad Operation Temporary Manual Override Time ButtonKeypad Lockout Up and Down Button ArrowsTemporary Override Run Mode Figure I-P-6.Temporary manual override menu screenFigure I-P-7.Temporary manual override run mode screen Table I-P-1. Zone sensor BAYSENS019 option menu settingsRemote Panel Indicator Signals From UCM to ZSM Intelligent CopyTo use Intelligent Copy Off FlashingIcon Descriptions Figure I-P-9.BAYSENS019 complete icon displayFigure I-P-10.BAYSENS020 complete icon display Setting theTime Programming theTime Clock OptionProgramming To review and change programsInstallation startup Unit Startup ProceduresPre-Startup Checklist Compressor DamageStartup Log EvaporatorCompressor Amp Draw Water Cooled Units Air Cooled UnitsPoints List RTM Module Points List Gbas ModulePoints List Ecem Module Points List -TracerTMLCI-I ModuleUnit Control Components RTM Module Board Standard on all UnitsTable O-GI-2. RTM sensor resistance vs. temperature VAV Box OptionTable O-GI-3. RTM setpoint analog inputs Human Interface Module Standard on all Units Heat ModuleVentilation Override Module VOM Option Purge sequence D Supply fan on Supply fan VFD on if equippedGeneric BuildingAutomation System Module Option Table O-GI-6. Gbas analog input setpoints Table O-GI-7. Gbas input voltage corresponding setpointsWaterside Components Figure O-GI-3. Basic water piping, constant water flow UnitAirside Components General Operation information Airside Economizer Interface with Comparative Enthalpy Air-Cooled CondensersInput Devices and System Functions ProperWaterTreatmentReturn AirTemperature Sensor Supply Air Temperature SensorSupply Airflow Proving Switches Filter SwitchOperation operation Control Sequences OperationUnoccupied Sequence of Operation Tracer Summit SystemMorning Warmup Cycling Capacity Morning Warmup MWUTimed Override Activation ICS Occupied Sequence Supply Air Setpoint Reset VAV Units Only Mechanical CoolingWater-Cooled Units Only Electric HeatCompressors Compressor Lead/Lag OperationTable O-SO-1. Compressor Stages Step Control Evaporator Coil Frost ProtectionTable O-SO-2. Pressure cutouts Service Valve Option OperationMaintenance information Table M-GI-1. SCWG/SIWG/SCRG/SIRG General Maintenance DataMaintenance procedures Maintenance ProceduresAir Filters Inspecting and Cleaning the Drain Pan Inspecting and Cleaning the FanRemove all standing water Supply Fan Variable Frequency Drive VFDFan Drive Fan Bearings Table M-MP-1. Baldor Fan Bearing Lubrication ScheduleTable M-MP-2.AO Smith Bearing Lubrication Schedule Table M-MP-3. Compatible Fan Bearing GreaseFan BeltTension Deflection = belt span/64Table M-MP-4. Fan shaft bearing torques Adjusting BeltTension BeltRefrigerant System Confined Space HazardsRefrigerant Evacuation Refrigerant LeakTesting Motor Winding DamageUse of Pressure Regulator Valves Gauges R407cMaintenance Coil Fin Cleaning Proper Coil CleaningAgentInlet GuideVanes Coil Freezeup Chemical Cleaning of Condenser and Economizer Coil Flow Switch MaintenanceCleaning the Flow Switch Piping ComponentsMaintenance Periodic Checklists Monthly ChecklistSemi-Annual Maintenance Annual MaintenanceCheck the zone thermostat settings Operating ProceduresCommon Unit Problems and Solutions System ChecksMaintenance diagnostics DiagnosticsHeat Module Auxilliary Temperature Sensor Fail Emergency StopEntering Cond WaterTemp Sensor Fail Entering Water Temp Sensor FailMode Input Failure Low Air Temp Limit TripLow Pressure Control Open Circuit 1, 2, 3, or MCM Communications FailureNSB Panel ZoneTemperature Sensor Failure Check Field/unit wiring between RTM and NSB PanelHumidity Sensor Failure Temp. Sensor FailureRTM Data Storage Error RTM Zone Sensor FailureSupply Fan VFD Bypass Enabled ProblemThe LCI-I has lost communication withTracer SummitSupply Fan Failure LCI-I Module Comm FailureRender all HI keystrokes ineffective VOM Communications FailureWSM Communications Fail WSM Mixed AirTemp Sensor Fail Water Flow 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.

Trane's VRF technology is complemented by its inverter-driven compressors, which adjust their speed according to the demand for heating or cooling. This means that the system operates more efficiently than traditional systems by consuming less energy during partial load conditions. The SCXG-SVX01B-EN also integrates advanced heat recovery capabilities, allowing it to transfer heat from one zone to another, further optimizing energy usage.

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.

In addition to its performance features, the Trane SCXG-SVX01B-EN emphasizes sustainability. It uses advanced refrigerants with low global warming potential (GWP), aligning with environmental regulations and helping to minimize the system's ecological footprint. The durable construction of the system ensures longevity and reliability, reducing maintenance costs and enhancing overall operational efficiency.

Finally, Trane supports its products with comprehensive warranties and a network of service professionals, ensuring that customers have access to expert assistance throughout the life cycle of their system. The SCXG-SVX01B-EN represents a blend of technology, efficiency, and versatility, making it an ideal choice for those seeking an effective heating and cooling solution.