Trane SCXG-SVX01B-EN manual Input Devices and System Functions, ProperWaterTreatment

Page 82

general

Operation information

Input Devices and System Functions

Following are basic input device and system function descriptions used within the UCM network on IntelliPak self- contained units. Refer to the unit wiring diagrams for specific connections.

Water Purge

NOTICE

ProperWaterTreatment!

The use of untreated or improperly treated water in coils may result in scaling, erosion, corrosion, algae or slime. It is recommended that the services of a qualified water treatment specialist be engaged to determine what water treatment, if any, is required.Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water or saline or brackish water.

During the unoccupied mode, water- cooled units will periodically circulate water through the condensers and waterside economizer if the user has enabled the purge function at the HI. The water purge function circulates water to introduce fresh water-treatment chemicals and help prevent water stagnation.The number of hours between each periodic purge, or purge duration, is user-defined at the HI between 1-999 hours. If the periodic purge timer expires while the unit is in occupied mode, it will wait for the next available unoccupied time before initiating water purge. Contrary, if a request for cooling occurs during a purge sequence, purge will terminate and cooling will commence.

Compressor Circuit Breakers

The compressors are protected by circuit breakers that interrupt the compressor power supply if the current exceeds the breakers “must trip” value. During a request for compressor operation, if the compressor module (MCM or SCM) detects a problem outside of it’s normal parameters, it turns any operating compressor(s) on that circuit off, locks out all compressor operation for that circuit, and initiates a manual reset diagnostic.

Compressor MotorWindingThermostats

A thermostat is embedded in the motor windings of each compressor. Each thermostat opens if the motor windings exceed approximately 221°F.The thermostat resets automatically when the winding temperature decreases to approximately 181°F. Rapid cycling, loss of charge, abnormally high suction temperatures, or the compressor running backwards could cause the thermostat to open. During a request for compressor operation, if the compressor module detects a problem outside of it's normal parameters, it turns any operating compressor(s) on that circuit off, locks out all compressor operation for that circuit, and initiates a manual reset diagnostic.

Low Pressure Control

Low pressure (LP) control is accomplished using a binary input device. LP cutouts are mounted on the suction lines near the compressors.The LP control contacts close when the suction pressure exceeds 27 ± 4 psig. If the LP control is open when a compressor starts, none of the compressors on that circuit will operate.They are locked out and a manual reset diagnostic initiates. The LP cutouts open if the suction pressure approaches 7 ± 4 psig. If the LP cutout opens after a compressor starts, all compressors operating on that circuit will turn off immediately and will remain off for a minimum of three minutes.

If the LP cutout trips four consecutive times during the first three minutes of operation, the compressors on that circuit will lock out and a manual reset diagnos- tic initiates.

Evaporator Temperature Sensor Frostat™

The evaporator temperature sensor is an analog input device used to monitor refrigerant temperature inside the evaporator coil to prevent coil freezing. It is attached to the suction line near the evaporator coil with circuits 1 and 2 connected to the SCM/MCM and circuits

3and 4 connected to theWSM.The coil frost cutout temperature is factory set at 30°F. It is adjustable at the HI from 25-35°F. The compressors stage off as necessary to prevent icing. After the last compressor stages off, the compressors

will restart when the evaporator temperature rises 10°F above the coil frost cutout temperature and the minimum three minute “off” time elapses.

Saturated CondenserTemperature Sensors

The saturated condenser temperature sensors are analog input devices.They are mounted inside a temperature well located on a condenser tube bend on air- cooled units, and in the condenser shell on water-cooled units.The sensors monitor the saturated refrigerant temperature inside the condenser coil and are connected to the SCM/MCM for circuits 1 and 2 (air or water cooled), and WSM for circuits 3 and 4 (only water- cooled).

Head Pressure Control

Head pressure control is accomplished using two saturated refrigerant temperature sensors on air-cooled units and up to four sensors on water-cooled units.

Air-cooled units: During a request for compressor operation when the con- densing temperature rises above the lower limit of the control band, the compressor module (SCM/MCM) sequences condenser fans on. If the operating fans cannot bring the condens- ing temperature to within the control band, more fans turn on. As the satu- rated condensing temperature ap- proaches the lower limit of the control band, fans sequence off. The minimum on/off time for condenser fan staging is

5.2seconds. If the system is operating at a given fan stage below 100% for 30 minutes the saturated condensing temperature is above the efficiency check point setting, a fan stage will be added. If the saturated condensing temperature falls below the efficiency check point setting, fan control remains at the present operating stage. If the fan stage cycles four times within a 10 minute period, the lower limit tempera- ture is redefined as being equal to the lower limit minus the temporary low limit suppression setting.The unit will utilize this new low limit temperature for one hour to reduce condenser fan short cycling.

82

SCXG-SVX01B-EN

Image 82
Contents JO and later design sequence ModelsSpecial Note on Refrigeration Emissions IntroductionHazard Identification HazardousVoltage w/CapacitorsContents Features and Benefits Refrigerant Handling ProceduresModular Series Self-Contained Unit Components Installation information Unit NameplateModel Number Description Scwg Model Number DescriptionDigit Digit 31 Compressor ServiceValvesDigit 22 Unit Finish Digit 24 Unit ConnectionSelf-Contained Ship-WithAccessory Model Number Description Model Number Description PswgAfter-ShipmentAccessory Model Number Receiving and Handling Shipping PackageInstallation Preparation Section ServiceAccessTable I-PC-1. Service and code clearance requirements TopView CCRC/CIRC 20, 29Rigging and Unit Handling Lifting Equipment CapacityUnit Handling Procedure Figure I-PC-7.Assembled modular unit proper riggingRemove panels FML, FMM, and FMR Split-Apart Unit AssemblyIntelliPak UnitsUCM Only Units with Thermostat OnlyFigure I-PC-9 How to assemble the split apart modular unit Skid Removal Pre-Installation ChecklistExternal Unit Isolation SCWG/SIWG Dimensions, DimensionsWeights Left-side viewSCRG/SIRGWeight, lbs SCRG/SIRG Dimensions,Left-side View Right-side view Top view Dimensions Weights Detail Dimensions,CCRC/CIRC Electrical connections, CCRC/CIRC Air-cooled condenser dimensions & weight, in-lbsCCRC/CIRC -Air-Cooled Condenser CCRC/CIRC Refrigerant connections,Hot water coil dimensions & weight, in-lbs Hot Water CoilSteam coil dimensions, in-lbs Steam CoilElectric Heat Coil Electric heat coil dimensions & weight, in-lbsFlexible Horizontal Discharge Plenum Waterside economizer weight, in-lbs Waterside EconomizerAirside Economizer Airside economizer dimensions & weight, in-lbsDetail a Detail B Control and LineVoltage Dimensions Weights VFDVariable Frequency Drive Option VFD Result in death or serious injury Mounting RequirementsVFD with bypass dimensions, Electrical Installation ProcedureVariable Frequency Drive with Bypass Water Piping Mechanical SpecificationsDuct Connections Hazardous Voltage w/Capaci- torsWaterside Piping Arrangements Table I-MR-1. Water Connection SizesRefrigerant Piping Air-Cooled Units Only Brazing ProceduresHazard of Explosion and Deadly Gases Live Electrical Components Unit Wiring DiagramsSupply PowerWiring Equipment DamageSelection Procedures Supply Fan Isolators Installation requirementsPre-Startup Procedures Shipping bracketFigure I-PR-3. Correct plenum insulation placement Field Wiring Connections Airside Economizer InstallationUnit Installation Unit HandlingInstalling theTransducer Static PressureTransducer Installation VAV units onlyTransducer 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 Installation Procedure Hydronic Coil InstallationUnit Structural Integrity Electric Heat CoilWiring Procedure Electric Heat InstallationTable I-PR-2.Available Electric Heat kW CV Unit Zone Sensor Options Standard with All IntelliPak UnitsZone Sensor Options for IntelliPak Control Units BAYSENS077* DescriptionBAYSENS074 Description CV andVAV Unit Zone Sensor OptionsVAV Unit Zone Sensor Option BAYSENS073 DescriptionMounting Location Zone Sensor InstallationWiring Mounting the SubbaseRight Mounting Directly to the Wall Mounting to Junction Box Variable AirVolume Zone Sensor BAYSENS020B Description ConstantVolume Zone Sensor BAYSENS019 DescriptionProgrammable Zone Sensors Programmable Zone Sensor Installation Airflows from adjacent zones or other unitsWiring theTimeclock Time Clock InstallationTime Clock Installation Checklist Time Clock OptionRemote Human Interface Panel Remote Human Interface Panel InstallationHuman Interface HI Panel Location RecommendationsMounting the Remote Human Interface RHI Panel ProcedureWall Mounting the RHI Panel Pre-startup Communication Link ShieldedTwisted PairWiring Wiring the Remote Human InterfaceLowVoltage AC FieldWiring Connections 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 Keypad Lockout Temporary Manual OverrideTime Button 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 settingsTo use Intelligent Copy Remote Panel Indicator Signals From UCM to ZSMIntelligent Copy Off FlashingIcon Descriptions Figure I-P-9.BAYSENS019 complete icon displayFigure I-P-10.BAYSENS020 complete icon display Programming Setting theTimeProgramming theTime Clock Option To review and change programsPre-Startup Checklist Installation startupUnit Startup Procedures Compressor DamageEvaporator Startup LogCompressor Amp Draw Water Cooled Units Air Cooled UnitsPoints List Ecem Module Points List RTM ModulePoints List Gbas Module Points List -TracerTMLCI-I ModuleUnit Control Components RTM Module Board Standard on all UnitsVAV Box Option Table O-GI-2. RTM sensor resistance vs. temperatureTable O-GI-3. RTM setpoint analog inputs Heat Module Human Interface Module Standard on all UnitsVentilation 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 ProperWaterTreatmentSupply Airflow Proving Switches Return AirTemperature SensorSupply Air Temperature Sensor Filter SwitchUnoccupied Sequence of Operation Operation operationControl Sequences Operation Tracer Summit SystemCycling Capacity Morning Warmup MWU Morning WarmupTimed Override Activation ICS Occupied Sequence Water-Cooled Units Only Supply Air Setpoint Reset VAV Units OnlyMechanical Cooling Electric HeatCompressor Lead/Lag Operation CompressorsTable O-SO-1. Compressor Stages Evaporator Coil Frost Protection Step ControlTable 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 Fan Inspecting and Cleaning the Drain PanRemove all standing water Variable Frequency Drive VFD Supply FanFan Drive Table M-MP-2.AO Smith Bearing Lubrication Schedule Fan BearingsTable M-MP-1. Baldor Fan Bearing Lubrication Schedule Table M-MP-3. Compatible Fan Bearing GreaseDeflection = belt span/64 Fan BeltTensionTable M-MP-4. Fan shaft bearing torques Adjusting BeltTension BeltConfined Space Hazards Refrigerant SystemRefrigerant Evacuation Use of Pressure Regulator Valves Gauges Refrigerant LeakTestingMotor Winding Damage R407cMaintenance Proper Coil CleaningAgent Coil Fin CleaningInlet GuideVanes Coil Freezeup Cleaning the Flow Switch Chemical Cleaning of Condenser and Economizer CoilFlow Switch Maintenance Piping ComponentsSemi-Annual Maintenance Maintenance Periodic ChecklistsMonthly Checklist Annual MaintenanceCommon Unit Problems and Solutions Check the zone thermostat settingsOperating Procedures System ChecksMaintenance diagnostics DiagnosticsEntering Cond WaterTemp Sensor Fail Heat Module Auxilliary Temperature Sensor FailEmergency Stop Entering Water Temp Sensor FailLow Pressure Control Open Circuit 1, 2, 3, or Mode Input FailureLow Air Temp Limit Trip MCM Communications FailureHumidity Sensor Failure NSB Panel ZoneTemperature Sensor FailureCheck Field/unit wiring between RTM and NSB Panel Temp. Sensor FailureRTM Data Storage Error RTM Zone Sensor FailureSupply Fan Failure Supply Fan VFD Bypass EnabledProblemThe LCI-I has lost communication withTracer Summit LCI-I Module Comm FailureVOM Communications Failure Render all HI keystrokes ineffectiveWSM 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.