Trane UniTrane Fan-Coil & Force Flo Air Conditioners, UNT-SVX07A-EN manual Steam Piping

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mechanical

Installation requirements

Steam Piping

CAUTION

Coil Damage!

In all steam coil installations, the condensate return connections must be at the low point of the coil to ensure condensate flows freely from the coil at all times. Failure to do so may cause physical coil damage from water hammer, unequal thermal stresses,freeze-up and/or corrosion.

1.Make piping connections to the steam coil as shown in Figure I-MR-11. Cap the unused connection.

2.The coil is already pitched within the unit to provide proper pitch to drain condensate out of the coil. Verify that the unit has been properly leveled.

3.Install a 1/2-inch, 15-degree swing check vacuum breaker in the unused condensate return tapping as close as possible to the coil.

4.Vent the vacuum breaker line to atmosphere or connect it into the return main at the discharge side of the steam trap.

5.Pitch all steam supply and return mains down a minimum of one inch per ten feet in the direction of flow.

6.Do not drain the steam mains or take- off through the coils. Drain the mains ahead of the coils through a steam trap to the return line.

7.Overhead returns require one psig of pressure at the steam trap discharge for each two-feet elevation to ensure continuous condensate removal.

8.Proper steam trap selection and installation is necessary for satisfactory

coil performance and service life. For installation, use the following steps: a. Position the steam trap discharge at least 12 inches below the condensate

return connection. This provides sufficient hydrostatic head pressure to overcome trap losses and ensure complete condensate removal.

Figure I-MR-2. Typical Piping for Steam Coils

b. Trane recommends using flat and thermostatic traps because of gravity drain and continuous discharge operation.

c. Use float and thermostatic traps with atmospheric pressure gravity condensate return, with automatic controls or where the possibility of low pressure supply steam exists.

d. Always install strainers as close as possible to the trap inlet side. Reference Figure I-MR-10 for an example of a properly piped steam coil.

Code of System Components in Piping Diagram

FT

Float and thermostatic steam trap

BT

Bucket steam trap

GV

Gate valve

OV

Automatic two-position (on-off) control valve

TV

Automatic three-way control valve

VB

Vacuum breaker

CV

Check valve

ST

Strainer

AV

Automatic or manual air vent

vacuum breaker (if desired)

steam supply

plugged

condensate return

Figure I-MR-11. Main steam coil connection diagram

UNT-SVX07A-EN

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Contents Models FC & FF ZO and later design sequence Installation, Operation, and MaintenanceCommon Hvac Acronyms General informationContents Model Number GeneralModel Number Description GeneralDigit 31 control option Digit 28 auxiliary control valve 0 = noneDigit 29 piping packages 0 = none Digit 30 control type 0 = noneTable I-GI-2. Low vertical fan-coil component data Table I-GI-1. Fan-coil component dataModel M inverted vertical cabinet Available ModelsModel E horizontal recessed Model K low vertical cabinetFactory-Installed Piping Packages Vertical Concealed, Model a DimensionsInstallation Weights Vertical Concealed Unit Dimensions & weights, in-lbsVertical Cabinet, Model B Vertical Cabinet Unit Dimensions, in-lbsHorizontal Concealed, Model C Horizontal Concealed Unit Dimensions, in-lbsHorizontal Cabinet, Model D Horizontal Cabinet Unit Dimensions, in-lbsHorizontal Recessed, Model E Installation Dimensions WeightsHorizontal Recessed Unit Dimensions, in-lbs Vertical Wall Hung Cabinet, Model F Vertical wall hung cabinet unit dimensions & weights, in-lbsVertical Recessed, Model H Vertical Recessed Unit Dimensions, in-lbsVertical Slope Top, Model J Vertical Slope Top Unit Dimensions, in-lbsLow Vertical Concealed, Model K Low Vertical Concealed Unit Dimensions, in-lbsLow Vertical Cabinet, Model L Low Vertical Cabinet Unit Dimensions, in-lbsInverted Vertical Cabinet, Model M Inverted vertical cabinet unit dimensions & weights, in-lbsInverted Vertical Recessed, Model N Inverted vertical recessed unit dimensions & weights, in-lbsFan-Coil Coil Connections Vertical Units Horizontal Units Horizontal Units Inverted Units Force Flo Coil Connections Vertical UnitsFresh Air Opening Dimensions, Horizontal Units Fresh Air Opening Dimensions, Vertical Units Wall Box Wall Box DimensionsProjection Panel Projection Panel DimensionsJobsite Storage Pre-installation Installation considerationsInstallation Preparation Receiving and HandlingPre-Installation Checklist Service AccessPiping Considerations Connecting field piping to coilMechanical Duct ConnectionsCondensate Drain Figure I-MR-4. Close-up view of the changeover sensor Venting the Hydronic CoilFigure I-MR-8. Manual circuit setter valve Balancing The Manual Circuit Setter ValveMechanical Steam Piping Code of System Components in Piping DiagramElectrical Unit Wiring DiagramsSupply Power Wiring Wall Mounted Control Interconnection WiringTable I-ER-3. Decimal to fractional HP kW conversion Table I-ER-2. Low vertical free discharge motors, 115 voltTable I-ER-9. Electric heat kW Table I-ER-8. Fan-coil electric heat kWTable I-ER-11. Force Flo single stage, low kW electric heat Table I-ER-10. Force Flo single-stage, max kW electric heatTable I-ER-12. Force Flo 2-stage electric heat Installing the Unit InstallationUnit Leveling Figure I-IP-5. Zone sensor only Figure I-IP-3. Zone sensor with on/cancel Comm jackZone Sensor Installation Installing Wall Mounted ControlsWiring Instructions Fan Mode Switch InstallationUnit Leveling Installation ChecklistDevice Addressing Communication WiringRecommended Communication Wiring Practices Pre-startupPre-Startup Checklist Tracer ZN510 & ZN520 Unit Startup Installation startupRelay Board Manual Fan Mode SwitchGeneral Operation information General InformationTracer ZN520 Operation Fan Mode Switch OperationSequence Tracer ZN010 & ZN510 OperationBinary Outputs Binary InputsSupply Fan Operation Fan Mode SwitchAnalog Inputs Zone SensorsTracer ZN520 Sequence of Operation Discharge Air Tempering Cooling OperationHeating Operation Continuous Fan Operation Fan Mode OperationEconomizer Damper Option Fan Start on High SpeedElectric Heat Operation Manual Fresh Air DamperBinary Outputs Table O-SO-12. Binary input configurationsTable O-SO-13. Binary output configuration Data SharingTable O-SO-15. Analog inputs Table O-SO-14. Analog inputsZone Sensor Fan SwitchOn/Cancel Buttons Table O-SO-16. Zone sensor wiring connectionsTable M-D-1. Tracer ZN520 Diagnostics Maintenance diagnosticsCycling the Fan Switch Translating Multiple DiagnosticsResetting Diagnostics Diagnostic ResetTable M-D-5. Valves Stay Open Table M-D-3. Fan outputs do not energizeTable M-D-4. Valves Stay Closed Table M-D-8. Fresh Air Damper Stays Closed Table M-D-6. Electric Heat Not OperatingTable M-D-7. Fresh Air Damper Stays Open Switch SW2 Electric Heat Maintenance troubleshootingTroubleshooting the Relay Board Switch SW1 Controller TypeYellow Comm LED Troubleshooting Tracer ZN010, ZN510 & ZN520Red Service LED Green Status LEDBOP5 BOP6 Table M-T-1. Test sequence for 1-heat/1-cool configurationsMain Drain Pan MaintenanceMaintenance Procedures Winterizing the Coil Coil MaintenanceSteam and Hydronic Coil Cleaning Procedure Replacing the Motor Control Device ReplacementAnnual Maintenance Periodic Maintenance ChecklistsMonthly Checklist Monthly MaintenanceCsti Fan Speed Switch Typical wiringCsti Non Fan Speed Switch Line voltage fan speed switch Tracer ZN010 with electric heat Tracer ZN510 with main and auxilliary valves ZN520 with 2-stage electric heat Page Page Page PL-TD-UNT-SVX07A-EN