Trane SCXG-SVX01B-EN manual Coil Freezeup

Page 102

maintenance

Maintenance procedures

Inspecting and Cleaning Coils

Coils become externally fouled as a result of normal operation. Coil surface dirt reduces heat transfer ability and can cause comfort problems, increased airflow resistance and thus increased operating energy costs.

Inspect coils at least every six months or more frequently as dictated by operating experience. Cleaning frequently is dependent upon system operating hours, filter maintenance, efficiency, and dirt load. Following is the suggested method for cleaning steam and hot water coils.

Steam and Hot Water Coils

1.Disconnect all electrical power to the unit.

2.Wear the appropriate personal protective equipment (PPE).

3.Access both sides of the coil section.

4.Use a soft brush to remove loose debris from both sides of the coil.

5.Use a steam cleaning machine, starting from the top of the coil and working downward. Clean the leaving air side of the coil first, then the entering air side. Use a block-off to prevent steam from blowing through the coil and into a dry section of the unit.

6.Repeat step 5 as necessary. Confirm that the drain line is open following completion of the cleaning process.

7.Allow the unit to dry thoroughly before putting the system back into service.

8.Straighten any coil fins that may be damaged with a fin rake.

9.Replace all panels and parts and restore electrical power to the unit.

10.Ensure that contaminated material does not contact other areas of the equipment or building. Properly dispose of all contaminated materials and cleaning solutions.

Refrigerant Coils

1.Disconnect all electrical power to the unit.

2.Wear the appropriate personal protective equipment (PPE).

3.Access to the coil section of the unit (both sides).

4.Use a soft brush to remove loose debris from both sides of the coil.

5.Mix a high quality coil cleaning detergent with water according to the manufacturer’s instructions. If the detergent is strongly alkaline after mixing (pH 8.5 or higher), it must contain an inhibitor. Carefully follow the cleaning solution manufacturer’s instructions regarding product use.

6.Place the mixed solution in a garden pump-up sprayer or high pressure sprayer. If using a high pressure sprayer note the following:

Maintain a minimum nozzle spray angle of 15°

Spray perpendicular to the coil face

Protect other areas of the equipment and internal controls from contact with moisture or the cleaning solution

Keep the nozzle at least six inches from the coil

Do not exceed 600 psig

Draining theWaterside Economizer Coil

NOTICE

Coil Freezeup!

Properly drain and vent coils when not in use.Trane recommends glycol protection in all possible freezing applications. Use a glycol approved for use with commercial cooling and heating systems and copper tube coils. Failure to do so may result in equipment damage.

Drain plugs are in the piping below each coil’s supply and return header. Use these plugs to drain the coil and piping.When draining the coil, open the vents at the top of the supply and return headers. Also, a drain plug is at the bottom of the inlet condenser manifold and in the outlet pipe near the unit’s left side. Remove these plugs to drain the condensers. Be sure to open the vent plugs at the top of the condenser inlet and outlet manifold. See Figure O-M-9.

When refilling the condenser/waterside economizer coil system with water, provide adequate water treatment to prevent the formation of scale or corro- sion.

Cleaning the Condenser

NOTICE

ProperWaterTreatment!

The use of untreated or improperly treated water in a CenTraVac 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.

Condensing water contains minerals that collect on the condenser tube walls. Cooling towers also collect dust and foreign materials that deposit in the condenser tube.The formation of scale or sludge in the condenser is indicated by a decreased water flow, low temperature difference between inlet and outlet water, and abnormally high condensing tem- peratures.To maintain maximum condenser efficiency, the condenser must remain free of built-up scale and sludge. Clean the condenser either mechanically or chemically.

Mechanical Cleaning of Condenser and Economizer Coils

1.Turn off the condenser supply water. Remove drain plugs discussed in the “Draining the Coil” section on page 91.

2.Remove the condenser head to expose the condenser tubes.

3.Rotate a round brush through the tubes to loosen contaminant.

4.Flush tubes with water to push the sludge out through the drain opening in the bottom of the supply header and the return pipe.

5.To clean the economizer tubes, remove the cast iron header plates at both sides of the coil between the inlet and outlet headers (four-row coils only; two-row coils do not have cover plates at right end). Rotate round brush through tubes from left end to loosen contaminants. Flush tubes with water.

102

SCXG-SVX01B-EN

Image 102
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 Pre-Installation Checklist Skid RemovalExternal Unit Isolation SCWG/SIWG Dimensions, DimensionsWeights Left-side viewSCRG/SIRG Dimensions, SCRG/SIRGWeight, lbsLeft-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 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 Control and LineVoltage Dimensions Weights VFDVariable Frequency Drive Option VFD Result in death or serious injury Mounting RequirementsElectrical Installation Procedure VFD with bypass dimensions,Variable Frequency Drive with Bypass Water Piping Mechanical SpecificationsDuct Connections 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 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 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 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 ConstantVolume Zone Sensor BAYSENS019 Description Variable AirVolume Zone Sensor BAYSENS020B 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 RecommendationsProcedure Mounting the Remote Human Interface RHI PanelWall 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 DamageStartup Log EvaporatorCompressor 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 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 ProperWaterTreatmentSupply Airflow Proving Switches Return AirTemperature SensorSupply Air Temperature Sensor Filter SwitchUnoccupied Sequence of Operation Operation operationControl Sequences Operation Tracer Summit SystemMorning Warmup Cycling Capacity Morning Warmup MWUTimed Override Activation ICS Occupied Sequence Water-Cooled Units Only Supply Air Setpoint Reset VAV Units OnlyMechanical Cooling 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 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 GreaseFan BeltTension Deflection = belt span/64Table M-MP-4. Fan shaft bearing torques Adjusting BeltTension BeltRefrigerant System Confined Space HazardsRefrigerant Evacuation Use of Pressure Regulator Valves Gauges Refrigerant LeakTestingMotor Winding Damage R407cMaintenance Coil Fin Cleaning Proper Coil CleaningAgentInlet 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 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.