Trane RT-PRC031-EN manual Mechanical Specifications Return Air, Fresh Air

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Mechanical Specifications

Return Air

General

Return air options shall include 100 percent modulating return fan and 100 percent modulating return with direct space building pressurization control. Return fans shall be either standard or low airflow.

100 Percent Modulating Return Fan

A single width plenum fan with airfoil blade shall be mounted on a shaft with fixed sheave drive. The fan shall be dynamically balanced for the operating envelop and tested in factory before being installed in unit. The plenum fan shall be test run in unit as part of unit test. Fan operating envelop rpm shall be below first critical speed. Fan shaft shall be mounted on two grease lubricated ball or roller bearings designed for 200,000-hour average life. Extended grease lines shall be provided to allow greasing of bearings from section base rail. Fan motor and assembly shall be mounted on common base to allow consistent belt tension with no relative motion between fan and motor shafts. The entire assembly shall be completely isolated from unit with 2-inch spring isolators. Discharge dampers at unit outlet shall modulate relief airflow in response to OA / return air damper position. The return fan VFD shall operate in conjunction with the supply fan.

100 Percent Modulating Return Fan with Statitrac™ Control Option

A single width plenum fan with airfoil blade shall be mounted on a shaft with fixed sheave drive. The fan shall be dynamically balanced for the operating envelop and tested in factory before being installed in unit. The plenum fan shall be test run as part of unit final run test. Fan operating envelop rpm shall be below first critical speed. Fan shaft

mounted on common base to allow consistent belt tension with no relative motion between fan and motor shafts. The entire assembly shall be completely isolated from unit with 2-inch spring isolators. The 100 percent modulating relief damper shall be modulated in response to building pressure. A differential pressure control system, (Statitrac), shall use a differential pressure transducer to compare indoor building pressure to outdoor ambient atmospheric pressure. The (Statitrac) control system shall modulate the discharge dampers to control the building pressure to within the adjustable, specified deadband that shall be adjustable at the Human Interface Panel. The return fan VFD shall modulate in response to return duct static pressure.

Fresh Air

General

Three outside air options: 0 to 25 percent motorized controlled outside air, 0-100 percent fully modulating economizer, and 0-100 percent fully modulating economizer with fresh air measurement.

Demand Control Ventilation

The fresh air damper position shall modulate in response to a CO2 sensor in the conditioned space, in order to minimize the unit energy consumption, yet simultaneously meet the ventilation requirements of ASHRAE Std 62.1.

Fresh Air Measurement

A factory mounted airflow measurement station (TRAQ) shall be provided in the fresh air opening to measure airflow. The airflow measurement station shall measure from 15 to 100 percent of unit airflow. The airflow measurement station shall adjust for temperature variations.

0-100 Percent Modulating Economizer Option

Operated through the primary temperature controls to automatically utilize OA for “free” cooling. Automatically modulated return and OA dampers shall maintain proper temperature in the conditioned space. Economizer shall be equipped with an automatic lockout when the outdoor high ambient temperature is too high for proper cooling. Minimum position control shall be standard and adjustable at the Human Interface Panel or with a remote potentiometer or through the building management system. A spring return motor shall ensure closure of OA dampers during unit shutdown or power interruption. Mechanical cooling shall be available to aid the economizer mode at any ambient. Standard economizer dampers shall have a leakage rate of 20 cfm/ft^2 at 1.0 in W.C. pressure difference.

Low Leak and Ultra Low Leak Economizer Dampers Option

Low leak dampers shall be provided with chlorinated polyvinyl chloride gasketing added to the damper blades and rolled stainless steel jamb seals to the sides of the damper assembly. The low leak dampers shall have a leakage rate of 10 cfm/ ft^2 (AMCA Class 2) at 1.0 in W.C. pressure difference.

Ultra low leak damper will have added sealing under the jam seals and in the frame. The ultra low leak dampers shall have a leakage rate of 4 cfm/ft^2 (AMCA Class 1) at 1.0 in W.C. pressure difference.

Note: Based on testing completed in accordance with AMCA Standard 500D.

shall be mounted on two grease lubricated ball or roller bearings designed for 200,000-hour average life. Extended grease lines shall be provided to allow greasing of bearings from section base rail. Fan motor and assembly shall be

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0-25 Percent Motorized Outside

Air Damper Option

0-25 percent motorized outside air damper shall provide up to 25 percent outside air. The damper position will be adjustable at the Human Interface Panel.

RT-PRC031-EN

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Contents IntelliPak II Air Handlers Introduction Table of Contents Controls Cabinet Mechanical Features and BenefitsStandard Features Features and Benefits Optional Features Features and Benefits Field Installed Accessories Features SummaryInstallation and Service ReliabilitySimplifying the Comfort System Features and Benefits Application FlexibilityIntegrated Comfort with Trane Tracer LCI Optimum Building Comfort Control Features and BenefitsInteroperability Statitrac Direct Space Building Pressurization Control StatitracSupply Fans with Inlet Guide Vanes Variable Frequency Drives VFDControls Variable Air Volume VAV Only Supply Air Temperature Controls Supply Air Pressure ControlHeating Controls Variable Air Volume VAV OnlySupply Air Setpoint Reset Zone Temperature Control Controls Constant Volume CV Only Occupied Zone Temperature ControlHeating Gas Heating Two-StageControls Constant Volume CV Only Auto Changeover Unoccupied Zone Temperature ControlCooling and Heating Hot Water or Steam HeatingControls VAV and CV Space Pressure Control StatitracMorning Warm-up Options Emergency OverrideControls VAV and CV Ventilation Override Module VOMHuman Interface Panel Main Menu Human Interface Panel HIGeneric Building Automation System Module Gbas 0-5 vdc Generic Building Automation System Module Gbas 0-10 vdc Chilled Water Coil Freeze StatSteam and Hot Water Coil Freeze Avoidance Night Setback SensorsDry Bulb Temperature Control of Economizer Occupied/Unoccupied input on the RTMTrane Tracer or BAS System Timed Override ActivationHumidification Control LonTalk Building Automation SystemReturn Fan Control TwinningApplications Considerations Exhaust/Return Fan OptionsApplication Recommendations AdvantagesSupply and Return Airflow Configurations Applications ConsiderationsSupply Airflow Configuration Return Airflow ConfigurationWith Bag CartridgeCorrosive Atmospheres Ventilation Override SequencesNatural Gas Heating Considerations Acoustical ConsiderationsUnit Placement Clearance RequirementsExternal Piping Enclosure Duct DesignProtecting Hydronic Coils From Freezing Selection Procedure Selection Procedure Exhaust Fan Motor Sizing Return Fan Motor SizingUnit Electrical Requirements Altitude CorrectionsModel Number Description Digit 7 Chilled Water Coil FIN SeriesModel Number Description Digit 20 System Control SelectionDigit 38 Belt Guards Burglar BARS/MARINE Lights General Data All dimensions in inches General DataGeneral Data Gas Heat Inputs/Input Ranges Economizer Outdoor Air Damper Leakage at rated airflowiInputs MBH Input MBH Range MBH Standard Damper Optional Low Leak DamperPerformance Adjustment Factors Wet Bulb Temperature Btu per PoundEnthalpy of Saturated Air Gas Heating Capacity Altitude Correction FactorsDB F WB F Performance Data-Chilled Water Coil CapacitiesChilled Water Coil Capacities-2 Row 5W Performance Data-Chilled Water Coil Capacities Chilled Water Coil Capacities-4 Row WChilled Water Coil Capacities-6 Row WD Chilled Water Coil Capacities-8 Row WD Supply Fan Performance Standard CFM Casing a Total Static Pressure Std Air1644 Supply Fan w/o IGV Supply Fan Performance Standard CFM -Casing B 9311117 Supply Fan Performance Standard CFM-Casing B Supply Fan Performance Standard CFM Casing C 7491019 Total Static Pressure Std AirPerformance 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 Performance Data-Exhaust Fan Negative Static Pressure Std AirPerformance Data-Exhaust Fan Static PresureInWC237i Wocfm Exhaust Fan Performance Standard CFM-Case C 32 Fan 4150 R P M Performance Data-Return Fan Return Fan Performance Standard CFM-Case a 36.5 FanPerformance Data-Return Fan Return Fan PerformanceReturn Fan Performance Standard CFM-Case B and Case C 40 Fan Return Fan Performance Electric Heat Air Temperature Rise Performance Data-HeatNatural Gas Heating Capacities1 Electric Heat kw RangesPerformance Data-Heat Hot Water Coil Heating Capacities Q/ITDSteam Coil Heating Capacities Q/ITD Properties of SteamChilled Water Coil Airside Pressure Drop in H20 Component Static Pressure Drops in. H2OFilters Prefilter High Low PD Cartridge Bag FiltersCartridge Filters Throw Temp Hi Temp Away Prefilter Casing Supply Air Fan Drive Selections Drive NoHorse Power HP Low Casing Std Exhaust Air Fan Drive SelectionsReturn Air Fan Drive Selections 15 HP 20 HP 25 HP 30 HP 40 HP Drive NoElectrical Service Sizing Electrical DataSet 1. Cooling with Gas Heat Air Handling Units Set 2. Cooling with Electric HeatElectrical Service Sizing Data-Motors Electrical Data Voltage Utilization RangeUnit Voltage Nominal Tons Voltage 460 575 FLA Add 90-150Dimensional Data Unit Top/Front ViewReturn Exhaust Unit Height Fan Casing Dimensional DataUnit Dimensions In.-One-Piece Unit Supply Opening Blank Casing Gas Heat Section Downflow/Horizontal Airflow Configuration DimensionsOpening Electrical Entry Details Piping Chilled Water Piping Locations Minimum Required Clearance Unit Option Selection Door Swing Ft. StandardMinimum Required Clearance Ft Control Exh BoxCross Member Location Blank Casing Section Dimensions Blank Casing SectionBlank 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 Component Weights Lbs WeightsApproximate Operating Weights Lbs Weights Size Wt lbs Control Box Main 454 Convenience Outlet Roof Curb WeightsInstalled Shipping Casing Blank Weight Options Options FiltersFresh Air System ControlAgency Approval Miscellaneous OptionsField Installed Accessories Electronic Zone SensorsRoof Curb Electrical System Mechanical SpecificationsGeneral Mechanical Specifications Cooling System Chilled Water Coil Water ValveExternal Piping Enclosure Air Handling SystemMechanical Specifications Filters Mechanical Specifications Exhaust AirNo Relief Standard Percent Modulating Exhaust Fan OptionMechanical Specifications Return Air Fresh AirHeating System CO2 Sensing Page RT-PRC031-EN
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