Trane RT-SVX10C-EN specifications Power Wire Sizing and Protection Device Equations, Plus

Page 45

Power Wire Sizing and Protection Device Equations (Continued)

RDE = (1.5 x LOAD 1) + LOAD 2 + LOAD 3 + LOAD 4

The selected RDE value will be the larger of the cooling mode RDE value or the heating mode RDE value calculated above.

Select a fuse rating equal to the RDE value. If the RDE value does not equal a standard fuse size as listed in NEC 240 - 6, select the next higher standard fuse rating.

Note: If the selected RDE is greater than the selected MOP value, then select the RDE value to equal the MOP value.

B. Dual Source Power units (200V and 230V)

These units will have two circuit values shown on the nameplate. The first circuit value will be the refrigeration (cooling mode) values calculated using calculation #1 above. The second set of circuit values shown on the nameplate will be for the electric heating circuit as follows.

MCA = (1.25 x LOAD 3)

MOP = (1.25 x LOAD 3)

Select a fuse rating for the electric heating circuit that’s equal to the MOP value obtained in the equation above. If the MOP value does not equal a standard fuse size as listed in NEC 240 - 6, select the next lower standard fuse rating (see note be- low for exception).

Note: If selected MOP is less than the MCA obtained in the equation above, then select the lowest standard maximum fuse size which is equal to or larger than the MCA, provided the selected fuse size does not exceed 800 amps.

RDE = LOAD 3

Select a fuse rating for the electric heating circuit that’s equal to the RDE value. If the RDE value does not equal a standard fuse size as listed in NEC 240 - 6, select the next higher standard fuse rating.

Note: If the selected RDE is greater than the selected MOP value, then select the RDE value to equal the MOP value.

Disconnect Switch Sizing (DSS)

Calculation #1 - SX, SF, SA, SL, or SS Single Power Source Units

DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)

Calculation #2 - All SEH_ Single Power Source Units

DSS = 1.15 X (LOAD 3 + Supply Fan FLA + Exhaust Fan FLA)

PLUS

DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)

Use the larger value of the two calculations to size the electrical service.

Calculation #3 - SEHF (200/230 Volt) 20 - 75 Ton Dual Power Source Units

DSS = 1.15 X LOAD3 for the Electric heater AND Calculation #1 for the Refrigeration Components

44

Image 45

Contents Models Later Design SequenceWith 3-DTMScroll Compressors Overview of Manual Literature Change HistoryTable of Contents Model Number Description General InformationDigit 3 Unit Airflow Hazard Identification Fiberglass WoolGeneral Information Commonly Used Acronyms Unit DescriptionSupply 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 No Step Surface Unit Dimensions & Weight InformationUnit Inspection As soon as the unit arrives at the job site StoragePage Sahf Cooling-Only Units 20 thru 75 Ton Unit Dimensional Data Dimensions Size InstallationUnit Base Dimensional Data Dimensions Electrical Entrance Data Unit DimensionsSEHF, SFHF, SLHF, SSHF, Sxhf Units 20 thru 75 Ton Unit Dimensions Size Unit Base Dimensional Data Dimensions SizeElectrical Entrance Data Unit Dimensions Size Unit Size Furnace Dimensions Note Size/MBH Length HeightSHG Cooling & Heating Units 90 through 130 Ton Sehf SahfSlhf SshfRoof Curb and Ductwork SE,SLSahf Sshf Sfhf Sxhf Sehg Sfhg Sxhg HF/G If a Trane Curb Accessory Kit is not used Installation Unit Rigging & PlacementHeavy Objects Pitch Pocket LocationTypical Unit Rigging Unit Base & Roof Curb Section Installation Field Installed Control Wiring Main Electrical Power RequirementsGeneral Unit Requirements Requirements for Electric Heat UnitsInstallation Condensate Drain Connections Page Removing Supply and Exhaust Fan Shipping Channels Motors 5Hp Page Units with StatitracTM Installation Sensor & Tubing InstallationConnecting the Gas Supply Line to the Furnace Gas Train Hazardous Gases and Flammable VaporsGas Heat Units SFH 350 MBH 850 MBH Flue Assembly Flue Assembly Installation1000 MBH Modulating 500 MBH 1000 MBH Hot Water Heat Units SLHSSHG-90 Steam Heat Units SSHThrough 130 Ton units Page Hazardous Voltage Live Electrical ComponentsUse Copper Conductors Only Typical Field Power Wiring 20 thru 75 Ton Page Condenser Fans Total FLA Supply Fan Motor FLA ea HorsepowerExhaust Fan Motor FLACombustion Blower Motor Sfhf OnlyUnit Tonnage No. of Compressors Tonnage Type Designation Load Definitions Load Single Source Power 380V, 415V, 460V,= Current of the Largest Motor Compressor or FAN Motor On the NextDisconnect Switch Sizing DSS Power Wire Sizing and Protection Device EquationsDual Source Power units 200V MCA = 1.25 x Load MOP = 1.25 x LoadControls using 24 VAC Installation Controls using DC Analog Input/OutputsConstant 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 OperationFenwal Ignition System Gas Heating Sequence of OperationUnit Start-Up Propane GasModulating Gas Sequence of Operation Flame FailureFull and Limited Modulating Gas Furnace Electric Heat Sequence of Operation Unit Start-Up Wet Heat Sequence of OperationFreeze Protection Unit Power Compressor DamageElectrical Phasing Voltage Supply and Voltage Imbalance Voltage SupplyVoltage Imbalance IGV Service Test Guide for Component OperationSupply FAN Rotating Components System Airflow Measurements Constant Volume SystemsVerifying Proper Fan Rotation If all of the fans are rotating backwardsCondenser Fan Location with Human Interface Designator Variable Air Volume Systems TraqTM Sensor Airflow Measurement Exhaust Airflow MeasurementOptional with all Units Optional with all units equipped with an economizerTon 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.CSTD AIRCFM RPM BHP HF-C25 000 HF-C20 00010,000 HF-C30 000AIR RPM BHP RPM BHP BHP RPM BHP RPM BHPTo Adjust the Fresh Air Damper Travel Economizer Damper AdjustmentExhaust Air Dampers Fresh Air & Return Air Damper OperationConnecting Rod Crank Arm Hole Damper Travel Adjustment PositionConfiguration Ton UnitsCompressor Start-Up Fresh Air & Return Air Linkage AdjustmentAll Systems 70 & 105 TonRefrigerant Charging Compressor Operational SoundsAt Shutdown At Low Ambient Start-UpCompressor 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 Thermostatic Expansion Valves Charging by SubcoolingLow Ambient Dampers Gas Furnace Start-Up Electric, Steam and Hot Water Start-UpCombustion Air Adjustment O2 High-Fire AdjustmentLow-Fire Adjustment 500 MBH, 850 & 1,000 MBH only Two Stage Gas FurnaceMBH Firing ManifoldCO2 Pressure Full Modulating Gas Furnace Heat ExchangerUnit control Limited Modulating Gas Furnace Unit Start-Up Modulating Gas RegulatorModulating Gas Regulator Legend Typical Gas Furnace Unit Start-Up Final Unit CheckoutService & Maintenance Unit Internal Fuse Replacement Data & VFD Factory Settings Service & MaintenanceQty Size of each Unit Model Box-type Note QtyWet Heat Coil Fin Data Total Coil Fins Model TypeService & Maintenance Fan Belt Adjustment Scroll Compressor Replacement Suction Line Filter/Drier InstallationGripbelts Gripnotch Cross Small P.D Section Range Min Max Hazardous Voltage! w/Capacitors VFD Programming ParametersSupply and Exhaust Fan VFD Programming Parameters Service & Maintenance Monthly Maintenance FiltersCooling Season Heating Season Coil CleaningCoil Cleaners Contains RefrigerantSteam 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