Trane RT-SVX10C-EN specifications Variable Air Volume Systems

Page 67

Use this data to assist in calculating a new fan drive if the CFM is not at design specifications.

An alternate method with less accuracy is to measure the static pressure drop across the evaporator coil. This can be accomplished by;

a. drilling a small hole through the unit casing on each side of the coil.

Note: Coil damage can occur if care is not taken when drilling holes in this area.

b. Measure the difference between the pressures at both locations.

c. Plot this value onto the appropriate pressure drop curve in Figure 4-3. Use the data in Table 4-2 (Component Static Pressure Drops) to assist in calculating a new fan drive if the CFM is not at design specifications.

d. Plug the holes after the proper CFM has been established.

9.Press the STOP key at the Human Interface Module in the unit control panel to stop the fan operation.

Variable Air Volume Systems

1.Ensure that the "System" selection switch at the remote panel is in the "Off" position.

2.Close the disconnect switch or circuit protector switch that provides the supply power to the unit's terminal block 1TB1 or the unit mounted disconnect switch 1S14.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote discon- nects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvert- ently energized. Failure to disconnect power before ser- vicing could result in death or serious injury.

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1 OR UNIT DISCONNECT SWITCH 1S14.

3.Turn the 115 volt control circuit switch 1S1 and the 24 volt control circuit switch 1S70 to the "On" position.

4.Open the Human Interface access door, located in the unit control panel, and press the SERVICE MODE key to display the first service screen. Refer to the latest edition of the appropriate SAHF-PTG manual for CV or VAV ap- plications for the SERVICE TEST screens and program- ming instructions.

5.Use Table 4-1 to program the following system compo- nents for operation by scrolling through the displays;

Supply Fan

Inlet Guide Vanes (100% Open, if applicable) Variable Frequency Drive (100% Output, if applicable) RTM Occ/Unocc Output (Unoccupied)

6.Once the configuration for the components is complete, press the NEXT key until the LCD displays the “Start test in __Sec.” screen. Press the + key to designate the de-

Unit Start-Up (Continued)

lay before the test is to start. This service test will begin after the TEST START key is pressed and the delay designated in this step has elapsed. Press the ENTER key to confirm this choice.

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshoot- ing of this product, it may be necessary to work with live electrical components. Have a qualified licensed electri- cian or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

7.Press the TEST START key to start the test. Remember that the delay designated in step 6 must elapse before the fan will begin to operate.

8.With the IGV's/VFD at 100% and the supply fan operat- ing at full airflow capability, measure the amperage at the supply fan contactor 1K16 & 1K15 (additional contactor for 90 through 130 Ton units). If the amperage exceeds the motor nameplate value, the static pressure is less than design and the airflow is too high. If the amperage is below the motor nameplate value, static pressure may be too high and CFM may be too low. To determine the actual CFM (± 5%);

a.Measure the actual fan RPM

b.Calculate the Theoretical BHP

Actual Motor Amps X Motor HP

Motor Nameplate Amps

c. Plot this data onto the appropriate Fan Performance Curve in Figure 4-4. Where the two points intersect, read straight down to the CFM line.

Use this data to assist in calculating a new fan drive if the CFM is not at design specifications.

An alternate method with less accuracy is to measure the static pressure drop across the evaporator coil. This can be accomplished by;

a. drilling a small hole through the unit casing on each side of the coil.

Note: Coil damage can occur if care is not taken when drilling holes in this area.

b. Measure the difference between the pressures at both locations.

c. Plot this value onto the appropriate pressure drop curve in Figure 4-3. Use the data in Table 4-2 (Component Static Pressure Drops) to assist in calculating a new fan drive if the CFM is not at design specifications.

d. Plug the holes after the proper CFM has been established.

9.Press the STOP key at the Human Interface Module in the unit control panel to stop the fan operation.

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Contents Later Design Sequence ModelsWith 3-DTMScroll Compressors Overview of Manual Literature Change HistoryTable of Contents Model Number Description General InformationDigit 3 Unit Airflow Unit Description Fiberglass WoolHazard Identification General Information Commonly Used AcronymsSupply AIR General InformationCFM Ventilation Control Module VCM Design special option onlyLead-Lag Constant Volume CV Units Unit Component Layout and Shipwith Locations Variable Air Volume VAV UnitsGeneral Information Space Temperature Averaging Control Module Locations for SHF 40, 60, 70 & 75 Ton Units Table of Contents Storage Unit Dimensions & Weight InformationNo Step Surface Unit Inspection As soon as the unit arrives at the job sitePage Sahf Cooling-Only Units 20 thru 75 Ton Electrical Entrance Data Unit Dimensions InstallationUnit Dimensional Data Dimensions Size Unit Base Dimensional Data DimensionsSEHF, SFHF, SLHF, SSHF, Sxhf Units 20 thru 75 Ton Unit Size Furnace Dimensions Note Size/MBH Length Height Unit Base Dimensional Data Dimensions SizeUnit Dimensions Size Electrical Entrance Data Unit Dimensions SizeSHG Cooling & Heating Units 90 through 130 Ton Sshf SahfSehf SlhfSE,SL Roof Curb and DuctworkSahf Sshf Sfhf Sxhf Sehg Sfhg Sxhg HF/G Pitch Pocket Location Installation Unit Rigging & PlacementIf a Trane Curb Accessory Kit is not used Heavy ObjectsTypical Unit Rigging Unit Base & Roof Curb Section Requirements for Electric Heat Units Main Electrical Power RequirementsInstallation Field Installed Control Wiring General Unit RequirementsInstallation Condensate Drain Connections Page Removing Supply and Exhaust Fan Shipping Channels Motors 5Hp Page Units with StatitracTM Installation Sensor & Tubing InstallationHazardous Gases and Flammable Vapors Connecting the Gas Supply Line to the Furnace Gas TrainGas Heat Units SFH 350 MBH 850 MBH Hot Water Heat Units SLH Flue Assembly InstallationFlue Assembly 1000 MBH Modulating 500 MBH 1000 MBHSSHG-90 Steam Heat Units SSHThrough 130 Ton units Page Live Electrical Components Hazardous VoltageUse Copper Conductors Only Typical Field Power Wiring 20 thru 75 Ton Page FLA Supply Fan Motor FLA ea HorsepowerCondenser Fans Total FLA Exhaust Fan MotorBlower Motor Sfhf Only CombustionUnit Tonnage No. of Compressors Tonnage Type Designation On the Next Single Source Power 380V, 415V, 460V,Load Definitions Load = Current of the Largest Motor Compressor or FAN MotorMCA = 1.25 x Load MOP = 1.25 x Load Power Wire Sizing and Protection Device EquationsDisconnect Switch Sizing DSS Dual Source Power units 200VInstallation Controls using DC Analog Input/Outputs Controls using 24 VACConstant Volume System Controls Constant Volume or Variable Air Volume System Controls Variable Air Volume System ControlsDepressurize PressurizeFire Purge16A Refer to Wiring Notes on16B Page 17A 17B Input Voltage VAV SetpointTable of Contents Sequence of Operation Cooling Sequence of OperationPropane Gas Gas Heating Sequence of OperationFenwal Ignition System Unit Start-UpFlame Failure Modulating Gas Sequence of OperationFull and Limited Modulating Gas Furnace Unit Start-Up Wet Heat Sequence of Operation Electric Heat Sequence of OperationFreeze Protection Compressor Damage Unit PowerElectrical Phasing Voltage Supply Voltage Supply and Voltage ImbalanceVoltage Imbalance IGV Service Test Guide for Component OperationSupply FAN If all of the fans are rotating backwards System Airflow Measurements Constant Volume SystemsRotating Components Verifying Proper Fan RotationCondenser Fan Location with Human Interface Designator Variable Air Volume Systems Optional with all units equipped with an economizer Exhaust Airflow MeasurementTraqTM Sensor Airflow Measurement Optional with all UnitsTon Supply Fan Performance without Inlet Guide Vanes 20 & 25 Ton Supply Fan Performance without Inlet Guide VanesWocfm 1200 RPM 40 HP 40% 300 RP Standard Evaporator Coil 20000 30000 40000 50000 60000 Drop Ton Supply Fan Performance with Inlet Guide Vanes 20 & 25 Ton Supply Fan Performance with Inlet Guide Vanes15 HP 900 RPM 80% 10 HP RPM AIR Through 75 Ton Component Static Pressure Drops Inches W.CAIR STDCFM RPM BHP HF-C30 000 HF-C20 000HF-C25 000 10,000AIR RPM BHP RPM BHP BHP RPM BHP RPM BHPFresh Air & Return Air Damper Operation Economizer Damper AdjustmentTo Adjust the Fresh Air Damper Travel Exhaust Air DampersTon Units Damper Travel Adjustment PositionConnecting Rod Crank Arm Hole Configuration70 & 105 Ton Fresh Air & Return Air Linkage AdjustmentCompressor Start-Up All SystemsAt Low Ambient Start-Up Compressor Operational SoundsRefrigerant Charging At ShutdownCompressor Locations Cooling Cycle Pressure Curve 340 320 Full Load 380 360 340 OD Ambient Full Load 380 360 340 OD Ambient 320 240 220 380 360 OD Ambient Charging by Subcooling Thermostatic Expansion ValvesLow Ambient Dampers Gas Furnace Start-Up Electric, Steam and Hot Water Start-UpTwo Stage Gas Furnace High-Fire AdjustmentCombustion Air Adjustment O2 Low-Fire Adjustment 500 MBH, 850 & 1,000 MBH onlyFiring Manifold MBHCO2 Pressure Heat Exchanger Full Modulating Gas FurnaceUnit control Modulating Gas Regulator Limited Modulating Gas Furnace Unit Start-UpModulating Gas Regulator Legend Typical Gas Furnace Unit Start-Up Final Unit CheckoutService & Maintenance Unit Internal Fuse Replacement Data & VFD Factory Settings Service & MaintenanceModel Type Unit Model Box-type Note QtyQty Size of each Wet Heat Coil Fin Data Total Coil FinsService & Maintenance Fan Belt Adjustment Suction Line Filter/Drier Installation Scroll Compressor ReplacementGripbelts Gripnotch Cross Small P.D Section Range Min Max VFD Programming Parameters Hazardous Voltage! w/CapacitorsSupply and Exhaust Fan VFD Programming Parameters Filters Service & Maintenance Monthly MaintenanceCooling Season Heating Season Coil CleaningContains Refrigerant Coil CleanersSteam or Hot Water Coils Final Process Index See Figure Gate type valve 36-37 See -12 Figure See VOM Contacts -16 Figure Equipment Damage From Ultraviolet UV Lights Warranty and Liability Clause115 116
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