Trane RT-PRC031-EN manual Heating System

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Mechanical Specifications

Economizer Control with Comparative Enthalpy

Used with the fresh air economizer, two enthalpy sensors are provided to compare total heat content of the indoor air and outdoor air to determine the most efficient air source when economizing.

Economizer Control with Reference Enthalpy

Used with the fresh air economizer, an outdoor enthalpy sensor is provided to compare the total heat content of outdoor air to a locally adjustable setpoint. The setpoint is programmed at the human interface, or remote human interface, to determine if the outdoor enthalpy condition is suitable for economizer operation.

Economizer Control with Dry Bulb

Used with the fresh air economizer, an outdoor temperature sensor is included for comparing the outdoor dry bulb temperature to a locally adjustable temperature setpoint. The setpoint is programmed at the human interface, or remote human interface, to determine if outdoor air temperature is suitable for economizer operation.

Heating System

Electric Heating Option

All electric heat models shall be completely assembled and have wired electric heating system integral within the air handler. Heavy duty nickel chromium elements internally wired with a maximum density of 40 watts per square inch shall be provided.

Heater circuits shall be 48 amps or less, each individually fused. Automatic reset high limit control shall operate through heater backup contactors. The units shall have optional factory mounted non-fused disconnect switch located in the main control panel to serve the entire unit.

Gas Fired Heating Option

All gas fired units shall be completely assembled and have a wired gas fired heating system integral within

unit. Units shall be UL/CSA approved specifically for outdoor applications downstream from chilled water coils. All gas piping shall be threaded connection with a pipe cap provided. Gas supply connection shall be provided through the side on horizontal discharge units, and through the bottom and side for downflow discharge units. All units shall be fire tested prior to shipment.

•Heat Exchanger shall be tubular two pass design with stainless steel primary and secondary surfaces. Free floating design shall eliminate expansion and contraction stresses and noises. Gasketed cleanout plate shall be provided for cleaning of tubes/ turbulators. Heat exchanger shall be factory pressure and leak tested.

•Burner shall be a stainless steel industrial type with an air proving switch to prevent burner operation if the burner is open for maintenance or inspection. Ceramic cone shall be provided to shape the flame to prevent impingement on sides of heat exchanger drum. Burner assembly shall house ignition and monitoring electrode.

•Combustion Blower shall be centrifugal type fan to provide air required for combustion. Fan motor shall have built-in thermal overload protection.

•Gas Safety Controls shall include electronic flame safety controls to require proving of combustion air prior to ignition sequence which shall include a 60 second pre-purge cycle. Pilot ignition shall be provided on 850, 1100 and 1800 MBH heat exchanger units. Sixty second delay shall be provided between first and second stage gas valve operation on two-stage heaters. Continuous electronic flame supervision shall be provided as standard.

•Full Modulation Gas Heaters shall be made from grades of stainless steel suitable for condensing conditions. The heater shall have a turn down ratio of at least 10 to 1 on the 850 and 20 to 1 on the 1100 and 1800

MBH

Steam Heating Option

Steam coils shall be Type NS with non-freeze steam distribution circuits. Distributor tubes shall be located concentrically within condensing tubes to assure even steam distribution. Coils shall be pitched to provide complete drainage. Steam modulating valve with actuator shall be provided.

Hot water Heating Option

Hot water coils shall be Type 5W and factory mounted in the air handling unit to provide complete drainage of coil. Hot water modulating valve with actuator shall be provided.

Accessories

Roof Mounting Curb

Roof mounting curb shall be heavy gauge zinc coated steel with nominal two-inch by four-inch nailer setup. Piping enclosure and supply/return air opening gasketing shall be provided. Curb shall ship knocked down for easy assembly. Channel shall be provided to allow for adjustment of return air opening location. Curb shall be manufactured to National Roofing Contractors Association guidelines.

Electronic Zone Sensors

•Zone Sensors shall provide two temperature setpoint levers, Heat, Auto, Off, or Cool system switch, Fan Auto or Fan On switch. Optional status indication LED lights, System On, Heat, Cool, and Service shall be available. These sensors shall be used with CV units.

•Programmable Night Setback Sensors shall be electronic programmable sensors with auto or manual changeover with 7 day programming. Keyboard shall provide selection of Heat, Cool, Fan Auto or On. All programmable sensors shall have System On, Heat, Cool, Service LED/indicators as standard. Night setback sensors shall have (1) Occupied, (1) Unoccupied and (2) Override programs per day. Sensors shall be available for CV zone

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Contents IntelliPak II Air Handlers Introduction Table of Contents Features and Benefits Standard FeaturesControls Cabinet Mechanical Features and Benefits Optional Features Features Summary Features and Benefits Field Installed AccessoriesInstallation and Service ReliabilityFeatures and Benefits Application Flexibility Integrated Comfort with Trane Tracer LCISimplifying the Comfort System Features and Benefits InteroperabilityOptimum Building Comfort Control Statitrac Statitrac Direct Space Building Pressurization ControlVariable Frequency Drives VFD Supply Fans with Inlet Guide VanesSupply Air Temperature Controls Supply Air Pressure Control Controls Variable Air Volume VAV OnlyControls Variable Air Volume VAV Only Supply Air Setpoint ResetHeating Zone Temperature Control Occupied Zone Temperature Control Controls Constant Volume CV OnlyHeating Gas Heating Two-StageUnoccupied Zone Temperature Control Controls Constant Volume CV Only Auto ChangeoverCooling and Heating Hot Water or Steam HeatingSpace Pressure Control Statitrac Controls VAV and CVMorning Warm-up Options Emergency OverrideVentilation Override Module VOM Controls VAV and CVHuman Interface Panel HI Generic Building Automation System Module Gbas 0-5 vdcHuman Interface Panel Main Menu Chilled Water Coil Freeze Stat Generic Building Automation System Module Gbas 0-10 vdcSteam and Hot Water Coil Freeze Avoidance Night Setback SensorsOccupied/Unoccupied input on the RTM Dry Bulb Temperature Control of EconomizerTrane Tracer or BAS System Timed Override ActivationLonTalk Building Automation System Humidification ControlReturn Fan Control TwinningExhaust/Return Fan Options Applications ConsiderationsApplication Recommendations AdvantagesApplications Considerations Supply and Return Airflow ConfigurationsReturn Airflow Configuration Supply Airflow ConfigurationWith Bag CartridgeVentilation Override Sequences Corrosive AtmospheresNatural Gas Heating Considerations Acoustical ConsiderationsClearance Requirements Unit PlacementDuct Design Protecting Hydronic Coils From FreezingExternal Piping Enclosure Selection Procedure Selection Procedure Return Fan Motor Sizing Exhaust Fan Motor SizingUnit Electrical Requirements Altitude CorrectionsDigit 7 Chilled Water Coil FIN Series Model Number DescriptionDigit 20 System Control Selection Model Number DescriptionDigit 38 Belt Guards Burglar BARS/MARINE Lights General Data General Data All dimensions in inchesGeneral Data Economizer Outdoor Air Damper Leakage at rated airflowi Gas Heat Inputs/Input RangesInputs MBH Input MBH Range MBH Standard Damper Optional Low Leak DamperWet Bulb Temperature Btu per Pound Performance Adjustment FactorsEnthalpy of Saturated Air Gas Heating Capacity Altitude Correction FactorsPerformance Data-Chilled Water Coil Capacities Chilled Water Coil Capacities-2 Row 5WDB F WB F Chilled Water Coil Capacities-4 Row W Performance Data-Chilled Water Coil CapacitiesChilled Water Coil Capacities-6 Row WD Chilled Water Coil Capacities-8 Row WD Total Static Pressure Std Air Supply Fan Performance Standard CFM Casing a1644 Supply Fan w/o IGV 931 Supply Fan Performance Standard CFM -Casing B1117 Supply Fan Performance Standard CFM-Casing B 749 Supply Fan Performance Standard CFM Casing C1019 Std Air Total Static PressurePerformance Data Supply Fan with Inlet Guide Vanes Performance Data Supply Fan with Inlet Guide Vanes Supply Fan Performance Standard CFM-Casing a Supply Fan Performance Standard CFM Casing B 1093 1600 RPM 1500 RPM 779 1021 1283 Negative Static Pressure Std Air Performance Data-Exhaust FanStatic PresureInWC Performance Data-Exhaust Fan237i Wocfm 415 Exhaust Fan Performance Standard CFM-Case C 32 Fan0 R P M Return Fan Performance Standard CFM-Case a 36.5 Fan Performance Data-Return FanReturn Fan Performance Performance Data-Return FanReturn Fan Performance Standard CFM-Case B and Case C 40 Fan Return Fan Performance Performance Data-Heat Electric Heat Air Temperature RiseNatural Gas Heating Capacities1 Electric Heat kw RangesHot Water Coil Heating Capacities Q/ITD Performance Data-HeatSteam Coil Heating Capacities Q/ITD Properties of SteamComponent Static Pressure Drops in. H2O Chilled Water Coil Airside Pressure Drop in H20High Low PD Cartridge Bag Filters Cartridge Filters Throw Temp Hi Temp Away Prefilter CasingFilters Prefilter Drive No Supply Air Fan Drive SelectionsExhaust Air Fan Drive Selections Horse Power HP Low Casing StdReturn Air Fan Drive Selections 15 HP 20 HP 25 HP 30 HP 40 HP Drive NoElectrical Data Electrical Service SizingSet 1. Cooling with Gas Heat Air Handling Units Set 2. Cooling with Electric HeatElectrical Service Sizing Data-Motors Voltage Utilization Range Electrical DataUnit Voltage Nominal Tons Voltage 460 575 FLA Add 90-150Unit Top/Front View Dimensional DataDimensional Data Unit Dimensions In.-One-Piece UnitReturn Exhaust Unit Height Fan Casing Downflow/Horizontal Airflow Configuration Dimensions OpeningSupply Opening Blank Casing Gas Heat Section Electrical Entry Details Piping Chilled Water Piping Locations Unit Option Selection Door Swing Ft. Standard Minimum Required ClearanceMinimum Required Clearance Ft Control Exh BoxDimensions Blank Casing Section Blank Casing SectionCross Member Location Blank Casing Section Field Installed Sensors Variable Air Volume VAV Field Installed Sensors Constant Volume CV Field Installed Sensors VAV and CV Wireless Zone Sensor Wall or Duct Mount CO2 Zone Sensors Weights Approximate Operating Weights LbsComponent Weights Lbs Weights Roof Curb Weights Installed Shipping Casing Blank WeightSize Wt lbs Control Box Main 454 Convenience Outlet Options Filters OptionsSystem Control Fresh AirMiscellaneous Options Agency ApprovalElectronic Zone Sensors Field Installed AccessoriesRoof Curb Mechanical Specifications GeneralElectrical System Water Valve Mechanical Specifications Cooling System Chilled Water CoilExternal Piping Enclosure Air Handling SystemMechanical Specifications Filters Exhaust Air Mechanical SpecificationsNo Relief Standard Percent Modulating Exhaust Fan OptionFresh Air Mechanical Specifications Return AirHeating System CO2 Sensing Page RT-PRC031-EN
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