Attachment_2_142010-26-0150.pdf

Performance Climate Changer™ Air Handlers

Sizes 3-120

Indoor and Outdoor Units Application and Performance Information

September 2013 CLCH-PRC022A-EN

Catalog

© 2013 Trane All rights reserved CLCH-PRC022A-EN

Introduction

Performance Climate Changer air handlers combine the Trane tradition of engineering excellence with the latest in manufacturing technology to give you an energy efficient air handler with superior performance, the highest quality and reliability, and the lowest installed cost in the industry. This air handler was designed to incorporate such features as component flexibility, integrated control options, and proven performance to give you the optimal system to clean, filter, dehumidify, heat, and cool your building.

Superior Performance

• ASHRAE 111 Class 6 low-leak casing design achieving less than 1.0 percent leakage rate at +/- 8 inches w.g.

• Less than L/240 @ +/- 8 inches w.g. panel and door deflection

• 2-inch R13 foam-insulated, mid-span thermal break panels and thermal break doors

• Casing thermal resistance ratio TR-value of 0.6

• New filter technology that exceeds LEED requirements and reduces filter pressure drops up to 50 percent versus previous designs

Industry-Leading Energy Efficiency

• AMCA 611-certified Traq airflow monitoring station

• Total energy-recovery wheels

• Cool Dry Quiet (CDQ™) desiccant dehumidification wheels

• Discharge plenums and plenum fan sections available with variable size, type, and location of openings to reduce static pressure loss and lower energy consumption

• 50,000 hour LED service lights

• Low-leak, high thermal performance casing design

• All airfoil-bladed dampers and Traq dampers meet ASHRAE 90.1 lowest specified leakage requirements

• High-efficiency coil fins deliver superior heat transfer while allowing face velocities in excess of 625 fpm without moisture carryover

System Optimization

• Optimal design to meet the Trane EarthWise™ design philosophy incorporating high-efficiency air handlers and water chillers with low flow rates and low temperatures.

• Factory-engineered, -mounted, and -tested control packages with properly sealed casing openings.

• Variety of coil types with high-efficiency coil fins allow lower coil approach temperature and reduce chance of moisture carryover

• Ability to choose the exact number of fins per foot of coil surface to enhance heat transfer and air pressure performance

• Wide array of fan options, including direct-drive plenum fans, belt-drive plenum fans, and housed fans

• Control options to easily incorporate fan pressurization and demand control ventilation strategies.

• Design and analysis tools provide whole building analysis, acoustical design guidance, equipment performance data, and suggested control strategies to help achieve optimum system design with tailored energy, IAQ, and project budget solutions.

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Introduction

Highest Quality

• UL/CUL listed

• AHRI Standard 430-certified air-handling unit

• AHRI Standard 410-certified coils are all factory tested

• AHRI Standard 1060-certified energy wheels

• All fans are dynamically balanced in the horizontal and vertical planes.

• All fans with VFDs undergo inverter balancing

• Formulated panels and integral base frame minimize seams that could introduce air leak paths

• Integrated raceway for wiring protection

• Integrated, fully-enclosed control panel for starters, VFDs, and unit-mounted controllers

• Pre-engineered, factory-mounted controls, including end devices, motor controllers, VFDs, unit-mounted DDC controllers, Traq™ damper ventilation control section, UL-listed turnkey control packages

Lowest Installed Cost

• Lifting lugs included on the integral base frame

• Indoor units ship with skid designed for forklift transport

• Variable height, size, type, and location of openings on discharge plenums minimize duct transitions

• Factory-installed interoperable controls shorten construction cycles, simplify job-site coordination, reduce installation time and expense, and provide single-source responsibility for warranty and service issues

• Single-point power is available with high-voltage distribution block and external main unit disconnect with lockout/tagout capabilities.

• External service module with 15 amp GFCI receptacle, light switch, and controller display and communications port

• Quick-connect wiring minimizes installation costs and provides wiring integrity between sections

• Factory-installed conduit connectors eliminate penetrations in the wrong location

• Motor leads can be run through flexible metal conduits to NEMA 4 external motor junction box

• Building Information Modeling (BIM) drawings to minimize jobsite ductwork, electrical, piping and structural interference

• Duct supports designed into factory roof curbs for pre-connection of ductwork

For dimensional information on Performance Climate Changer air handlers see Trane catalog

CLCH-PRC023-EN.

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Table of Contents

Introduction Superior Performance Industry-Leading Energy Efficiency System Optimization Highest Quality Lowest Installed Cost

Features and Benefits - Unit

Form, Function and Flexibility Reduces Footprint when Stacked Eases Retrofit, Renovation, and Replacement Airside Options

Construction and Integrity

Engineered for Good IAQ

Sound-Sensitive Solutions Provide Accurate, Tested Sound Data Minimize Sound Source

Increase Operating Efficiency

Turnkey Control Solutions Single-Source Responsibility Single-Point Power Reduced Installation Costs Reliable Operation Open Protocol Service Module

Proven Performance AHRI Standards Miami/Dade County Notice of Compliance (NOA) UL Listing IBC Seismic Certification AMCA Certification Canadian Registration Number (CRN) ISO Certification

HVAC Design Fundamentals

Provide Proper Ventilation

Maintain Building Pressure

Protect Coils from Freezing

Filter Contaminants Particulate Filter Guidelines Gases and Vapors

Minimize Microbial Growth Water Management Dehumidification

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Humidification

Provide Quiet Comfort

Application Considerations

Air Handler Design Single-Path Design Dual-Path Design

Standard AHU Arrangements Draw-Thru Arrangements Blow-Thru Arrangements Stacked Units

Arrangements for Specific Applications Building Pressurization Building Pressurization with Return Fan and Economizer Building Pressurization with Exhaust Fan and Economizer Building Pressurization with Barometric Relief Economizer Dehumidification Dehumidification with CDQ™ (Cool, Dry, Quiet) Desiccant Wheels Dehumidification with Coil Runaround Loops Dehumidification with a Split Dehumidification Unit (SDU) Dehumidification with Hot-Water Heat-Recovery Coils

Energy Recovery Energy Recovery with a Total Energy Wheel Energy Recovery with Coil Runaround Loops Energy Recovery with Air-to-Air Plate Frame Heat Exchangers

Acoustics

Components and Options

Access/Blank and Turning Section

Blender

CDQ™ Desiccant Dehumidification Wheel

Coils Coil Optimization Drain Pans Electric Heat Integral Face-and-Bypass Coil

Dampers Face-and-Bypass Dampers Traq™ Dampers and Low Flow Traq Dampers

Diffuser

Discharge Plenum

Economizer

Energy Recovery

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Energy Wheels Coil Runaround Loop Air-to-Air Plate Frame Heat Exchanger

Fans Fan Choices Constant Volume vs. VAV Systems Airflow Measuring Systems

Filtration and Air Cleaning Filtration Options Air Cleaning Options

Gas Heat

Humidifier

Inlet Hood

Mixing Box and Economizer

Multizone

Silencers

General Data

Unit Size 3

Unit Size 4

Unit Size 6

Unit Size 8

Unit Size 10

Unit Size 12

Unit Size 14

Unit Size 17

Unit Size 21

Unit Size 22

Unit Size 25

Unit Size 26

Unit Size 30

Unit Size 31

Unit Size 35

Unit Size 36

Unit Size 40

Unit Size 41

Unit Size 50

Unit Size 51

Unit Size 57

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Unit Size 58

Unit Size 66

Unit Size 80

Unit Size 100

Unit Size 120

Coils

Drain Pans

Coil Connections Hydronic and Steam Coil Connections Refrigerant Coil Connections

Coil Circuiting Distributor Arrangement Distributor Circuiting

Face-Velocity Limits for Moisture Carryover

Performance Data

Air-to-Air Plate Heat Exchangers Blenders

Dampers Energy Wheel Dampers

Mixing Box Dampers Mixing box with airfoil blade dampers Mixing box with Traq dampers AMCA 610 Test Performance for Traq Damper

Multizone Dampers

Diffuser

Discharge Plenums Horizontal or Vertical Discharge Plenum with Factory Openings

Economizer for Outdoor Units

Electric Heat

Filters

Gas Heat

Hoods

Humidifiers

Multizone

Silencers

Trane Catalytic Air Cleaning Systems (TCACS

Electrical Data

Mechanical Specifications

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Seismic Certification

Unit Construction Casing Construction Unit Flooring Casing Leakage

Insulation

Drain Pans

Access Doors View Windows

Marine Lights

Fans FC Fan BC Fan AF Fan Belt-Drive Plenum Fan Direct-Drive Plenum Fan

Fan Isolation 1-Inch, Seismic Spring Isolators 2-Inch, Seismic Spring Isolators

Fan Drives

Fan Motors Motor Options Grease Lines

Fan Section Options Multiple Belt Drive External Motor Junction Box Motor wiring conduit Flow Meter Belt Guard Door Guard

Fan Modulation Variable-Frequency Drives (VFDs) Inverter Test

Coils Horizontal and Vertical Coil Sections Inspection Section Water Coils (UW, UU, W, 5W, 5A, WD, 5D, D1, D2, P, or TT) Refrigerant Cooling Coils (UF, FD) Steam Heating Coil (NS) Coil Coating Electric Heat Coil Section Integral Face-and-Bypass Coils

Dampers

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Barometric Relief Dampers

Energy Recovery Wheel Section Performance and Certification Wheel Construction Wheel Motor Maintenance and Access Wheel Control Frost Control Wheel Warranty

Cool Dry Quiet (CDQ™) Desiccant Wheel Wheel Construction CDQ Wheel Drive System Maintenance and Access Doors

Humidifiers Direct Steam Atmospheric steam

Filters and Air Cleaners Permanent Filters Throwaway Filters Pleated Media Filters Bag Filters Cartridge Filters 4-Inch High-Efficiency Filters HEPA Filters Ultraviolet (UVc) Lights Air Cleaning Systems

Filter Section Options Differential Pressure Gage

Mixing Section Mixing Section, Filter Mixing Section, Airflow Measurement Station (Traq™ Dampers), and Economizer Sections Dampers Airflow Measurement Station (Traq Dampers) Internal and External Face-and-Bypass Damper Section Internal Face Damper Section

Gas Heat Section

Air-to-Air Plate Frame Heat Exchanger Construction Performance Corrosion Coating (Optional) Frost Damper (Optional) Bypass Dampers (Optional)

Multizone Sections Two-Deck Multizone Three-Deck Multizone

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Double-Duct Section Triple-Duct Section

Paint Options Outdoor Unit Paint Optional Indoor Unit Paint

Pipe Cabinet

Outdoor Unit Roof

Silencers

Other Sections and Options Access/Inspection Sections Blender Section Diffuser Section Turning and Discharge Plenum Sections Plenum Attenuation Panels

Controls Combination Starter–Disconnects Combination VFD and Disconnects Starter/Disconnect or VFD Enclosure Options Factory-Mounted DDC System Direct Digital Controller Factory-Mounted Control Options—Electronic End Devices Field-Mounted Control Options

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Features and Benefits - Unit

Form, Function and Flexibility

Flexibility and versatility are standard in the Performance air handler. As a customizable cataloged air handler, standard components can be arranged to meet most commercial, institutional and industrial applications for the indoor air handler market. Pre-engineered custom options expand that flexibility while ensuring proven, tested performance and dependability, and reducing the costs and long lead times associated with most custom units. Some projects call for an air handler that incorporates new, emerging technologies or a job-specific requirement. Trane’s experienced team of professionals can tailor the Performance air handler to meet these requirements.

The Performance air handler design adopts a “building-block” approach that allows you to design a unit specifically for your project. Choose the “blocks” you need from the wide range of standard and custom-engineered sections, and arrange them to satisfy the air-handling requirements of the application.

Reduces Footprint when Stacked

The Performance unit’s design makes it easy to stack sections - even coil sections. Reducing the unit footprint is very advantageous, especially in tight mechanical rooms or limited roof space. The structural integrity remains intact, even when panels are removed for service or maintenance activities.

Eases Retrofit, Renovation, and Replacement

Buildings age, usage changes, loads change, new technology emerges, codes and standards are revised. Change is inevitable. The Performance air handler readily lends itself to the special needs of the renovation, retrofit, and replacement markets. The Performance air handler can be shipped in small segments that can easily be moved into tight spaces of existing buildings.

Figure 1. Trane Performance Climate Changer™ air handler

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Airside Options

Many standard options are available for specific applications, including:

Construction and Integrity

Trane engineered panels and doors incorporate mid-span, internal thermal breaks to eliminate thermal conduction paths from the interior of the air handler to the exterior. Likewise, door frames also feature thermal breaks to minimizing heat transfer.

The panels and doors are designed to provide extraordinary insulating capabilities for efficient and cost effective performance. Panels are formulated with interlocking seam features and integral gasket seals optimized to drive down casing air leakage. The Performance air handler design is capable of meeting an ASHARE 111 Class 6 leakage level, better than most custom designs, up to +/-8 inches w.g. Standard double-wall panels and doors include two-inch closed cell foam insulation providing a minimum R-value of 13, in addition to unsurpassed panel strength and L/240 deflection at +/- 8 inches w.g.

The no-through-metal design and low casing air leakage delivers thermal performance that assures condensation will not form on the casing exterior even under 55°F supply air temperature and design conditions on the unit exterior of 81°F dry bulb and 73°F wet bulb. In addition to the low air leakage, these standard features prevent equipment from unnecessarily creating slip hazards in the mechanical equipment room or premature corrosion of the casing. With this level of casing performance and thorough testing of Trane engineers, Trane is able to deliver predictable thermal performance and key guidance to consulting engineers.

Heavy-duty door handles and hinges are surface-mounted, eliminating a potential leakage path since they do not pierce the casing. A removable hinge pin allows for easy door removal; the symmetrical handle and hinge mounting allows for easy field modification if it becomes necessary to change from a left-hand to a right-hand door.

Engineered for Good IAQ

The building industry is continuously evolving and the rate of change is accelerating. The Performance air handler is engineered to address today’s multifaceted design issues required to provide good indoor air quality (IAQ). Building owners must give particular attention to maintaining and documenting IAQ to ensure occupant comfort and to meet industry and government regulatory standards.

In Standard 62.1, the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) provides guidance regarding suitable outside air volume to be brought into the building, recommended air filtration, and design recommendations and procedures to control microbial growth. However, applying these principles may lead to greater energy consumption, larger and noisier units, and increased risk of coil freeze-up. The flexibility of the Performance air handler enables you to configure a unique, IAQ-ready air-handling system that can address all of these concerns.

• Exhaust or return fan economizers • Variable height vertical discharge plenums

• Direct space pressurization control • Variable length horizontal discharge plenums

• Thermal break double-wall access doors • Positional controls section

• Thermal break casing • Multiple base frame heights/multiple curb heights

• Factory-mounted and run-tested controls • Single-handle, multiple latch doors

• Versatile access section lengths to meet specific needs • External motor junction box

• Multiple belt drives • Low-flow Traq dampers

• Full array of pre- and final filter sections • Silencers

• Extended grease lines • Gas heat

• Single-point power • Flush-mounted dial-type filter gauge

• LED service lights • Stainless steel inner liners

• Variable sizes, types and opening locations for discharge plenums, plenum fans, and mixing boxes

• Treadplate floor

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Serviceability/Cleanability

Sound-Sensitive Solutions

Provide Accurate, Tested Sound Data

Traditionally, ASHRAE algorithms have been used to predict the sound power levels of air-handling units. Although this method is easy to do, it can be inaccurate. It can produce results that deviate from tested data by as much as ±15 dB. For more accurate sound data, AHRI has established Standard 260, which is a method of rating sound data for ducted air-handling equipment. It is intended to be a guide for the industry, including HVAC manufacturers, engineers, installers, contractors, and consumers. AHRI Standard 260:

• Strengthens testing and calibration procedures

• Provides repeatable results

• Uses a reverberant-room approach, a mapped sound-rating concept, and reference sound-source calibration

• Is application driven

• Includes ducted outlet, ducted inlet, and casing (radiated) test configurations

It is important to note that sound data for Trane air handlers is taken per AHRI Standard 260. This sound power standard covers eight octave bands (63–8000 Hz) and is unweighted (no dB corrections). AHRI Standard 260-tested sound data can be found in TOPSS.

Figure 2. Smooth, interior surfaces make cleaning easy

• Full-size access doors and access sections are available for easy cleaning of internal components

• Fully removable coil and access panels

• Smooth, cleanable interior double-wall surfaces help improve indoor air quality.

• Coils are raised up out of the drain pan to make all coils removable from the side and provide easier access to the drain pan for cleaning.

• Optional antimicrobial treatments for drain pans and filters.

Figure 3. Schools and auditoriums are low noise criterion

(NC) applications

Acceptable space sound levels enhance occupant comfort and productivity.

However, system designs that promote good IAQ can adversely affect acoustics:

unlined ductwork, air handlers with solid double-wall construction, and increased fan static pressures (resulting from the addition of energy recovery and increased filtration) can magnify the building’s background noise.

Trane air handlers have unique product flexibility that allow designers to use them in many low-NC (noise criteria) applications.

NC curves define not-to-exceed limits for a noise source to achieve a level of occupant acceptance. (See applications engineering manual FND-AM-5, “Acoustics in Air Conditioning,” for more information about NC levels.)

Performance air handlers can be used successfully in NC 35 offices and schools.

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Minimize Sound Source

Trane air handlers have many features to optimize the source sound level for job requirements while minimizing the cost of the air handler including:

For more information on how to apply these options in your air handler, contact your local Trane sales representative.

Increase Operating Efficiency

The Trane EarthWise™ system is a design philosophy that uses low flow rate and low temperature on both the waterside and airside, along with high-efficiency equipment. Along with reducing emissions, it also reduces first cost, lowers operating costs, and improves the acoustical characteristics and comfort of the HVAC system. Low-temperature, low-flow systems can challenge conventional cataloged air-handling units. The flexibility of the Performance air handler makes it ideally suited for low temperature applications. In addition:

• Trane has developed a unique high-efficiency fin surface that allows face velocities in excess of 625 fpm without moisture carryover. The fins have been engineered and tested to meet these higher face velocities at a given set of design conditions. This allows you to utilize the latest in airside heat transfer to further improve the efficiency of the overall system by lowering the coil approach temperature.

• The ability to choose the exact number of fins per foot of coil surface allows heat transfer and air-pressure-drop performance to be tuned to specifically meet project needs.

• The wide array of fan options lets you choose the right fan for the application.

• Factory-engineered, -mounted, and -tested controls provide the added insurance that the airflow sensors and sequences meet your requirements.

• Further system enhancements can be made by taking advantage of the latest controls technology with fan pressurization control (required in most variable-air-volume systems per ASHRAE Standard 90.1) and/or ventilation reset of the outside air damper based upon occupancy levels in the space.

Turnkey Control Solutions

Trane air handlers offer one of the most comprehensive factory-packaged controls systems available, from end devices to total system integration, with industry-standard open protocols. An air handler turnkey control package can be used in a stand-alone operation, or it can be fully integrated into a comprehensive control system. Trane’s Integrated Comfort™ system (ICS) incorporates the benefits of factory-installed controls and links the air handler to the Tracer Summit™ building management system.

Figure 4. Plenum fans help reduce noise levels

• A variety of fan types to minimize the sound generated by the fan and to optimize cost no matter the application.

• Double-wall perforated insulation helps attenuate high-frequency noise.

• Two-inch discharge plenums reduce turbulence and create an end reflection that dampens low-frequency sound. The 2-inch perforated liner option attenuates higher frequency sound.

• Turning modules used to turn the air and reduce turbulence work as effective, low-cost silencers.

• Silencers for horizontal or vertical discharge in the plenum fan section come in 3-ft. and 5-ft lengths. They are dissipative or film-lined for hospital and clean-room applications.

CLCH-PRC022A-EN 15

These options are designed to lower installation costs and risk while dramatically improving the quality of the application and the performance of the air handler. The entire air handler control system is engineered, mounted, wired, and tested before leaving the factory. As a result of strict quality manufacturing methods, Tracer control options bring consistency and reliability to the control-system package and provide single-source responsibility.

Single-Source Responsibility

Equipment and interoperable controls, engineered and provided by a single manufacturer, provide faster construction cycles and simplify job-site coordination efforts. This simplification reduces installation time, expense, and risk.Trane equipment and controls package provides the optimal performance when integrated with a Tracer building management system, forming a Trane Integrated Comfort™ system (ICS). ICS is a powerful system architecture that unifies Trane HVAC equipment, direct digital control, and building management into a cohesive whole with an assured source of support. This system is managed with the Tracer Summit building management system.

The Tracer Summit building management system is based on ASHRAE and American National Standards Institute (ANSI) BACnet Standard 135.

The following control devices are available as standard mounted on fan sections or within the positional controls section:

The following end devices are also available:

• Combination starters and disconnects • Valves

– International Electrotechnical Commission (IEC) standards

• Electronic damper actuators

• Variable-frequency drives (VFDs) • Temperature and pressure sensors

– Drive/OFF/Bypass selector switch – Available in multiple temperature sensor materials

– Digital manual speed control • Averaging temperature sensors

– Three-year parts and labor warranty – Available in multiple temperature sensor materials

– Open drive to provide easy serviceability • Fan and filter status switches

• Unit-mounted direct digital controllers (DDCs). • Low-limit switches (see Figure 6)

– A factory-wired and mounted Tracer programmable controller is available.

– Double pole, single throw, manual reset

– Available wired to low voltage and high voltage

• Condensate overflow switches

• Humidity sensors

Figure 5. Integral controls cabinet for starters, variable frequency drives, and unit controllers

Figure 6. Factory-mounting ensures quality installation, as shown with the low-limit radius bend

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Single-Point Power

For air-handling units requiring a supply fan with a return/exhaust fan, electric heat, gas heat or CDQ, we can supply single-point power. Single-point power wiring includes a high voltage distribution block and main unit disconnect with lockout/tagout capabilities. From a single line voltage connection, power is provided to all components including controls and service lights.

Single-point power wiring does not compromise the UL or ETL certification of the unit.

Reduced Installation Costs

After installation, Tracer controllers enable information-sharing and complex control strategies, such as ventilation reset, throughout the HVAC system. They also ensure that each subsystem operates in the most efficient manner possible while continuing to satisfy current loads. The result is reduced building energy consumption through effective operation of the entire HVAC system at part-load conditions.

Trane ICS incorporates the latest energy-saving concepts to produce comfort at the lowest possible cost. In addition, it offers sophisticated building management features, such as after-hours billing, for commercial properties. This revenue opportunity enables developers and owners to accurately monitor and bill the cost incurred by a single tenant in after-hours usage of a facility. An optional DDC variable-air-volume (VAV) capability helps to accurately control each tenant space so that only an individual tenant’s HVAC systems are activated. This helps minimize operating costs while providing flexible work hours.

Reliable Operation

Controller end devices, such as low-limit switches and averaging temperature sensors, are properly sized, selected, laboratory-tested, and mounted for optimal system performance. Trane engineers its unit-mounted controllers to provide the highest level of useful information possible.

A computer-based test station tests low-voltage end-device functionality and surveys the input devices. This procedure ensures trouble-free installation and reliable operation when the Performance air handler reaches the job site. This feature can limit the number of call-backs and punch-list tasks.

Incorporating a Performance air handler with Trane ICS provides an engineered system of proven components and comfort concepts that is both state-of-the-art and reliable. Standard components are used to aid in serviceability and uniformity from building to building. These components, when tied to a Tracer Summit system, provide a powerful tool for scheduling preventive maintenance, reducing equipment downtime, and controlling service expense.

Figure 7. Quick-connect wiring While the air-handling system is in the factory, trained technicians install the control end devices and controllers using state-of-the-art equipment and agency-approved wiring practices. The system is pre-designed, pre-engineered, and checked out, making jobsite installation and commissioning fast and easy.

While many of these tasks and procedures could be done in the field, it is beneficial to do them in the factory due to time and accessibility constraints. As a result, field expenses for installation costs of conduit and wire are minimized, additional lead-time is alleviated, and jobsite coordination is simplified. Casing integrity is also maintained by minimized penetrations.

Factory wiring minimizes installation costs, too. Quick-connect wiring (see Figure 7) ensures integrity between sections without having to identify or check continuity.

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Open Protocol

Trane Tracer™ controllers bring open communication protocols to the product offering. For building-level and unit level communications, Tracer controllers use BACnet®. BACnet is a standard, open communications protocol that allows integration and interoperability, enabling the controllers to not only tie into a Tracer Summit system, but also other building automation systems.

At the unit level, Trane can also use LonTalk® for peer-to-peer communication between Trane controllers and other approved LonTalk controllers. Trane can provide a factory-wired terminal strip that can be wired into a field-mounted controller. The programmable controller (MP581) follows the certified Space Comfort Controller (SCC) profile for constant-volume systems and the Discharge Air Controller (DAC) profile for constant-volume or VAV systems. Adherence of this controller to these standardized, certified profiles enables it to communicate with other controllers that use the same certified LonTalk profiles. Go to www.lonmark.org for more information.

Service Module

Proven Performance

AHRI Standards

Figure 8. The service module can include a 15-amp GFCI.

Performance air handlers can be equipped with an easy access Service Module when a Trane programmable controller and/or service lights are factory mounted.

All service lights are wired to a common switch within the Service Module, located either on the fan section or the controller cabinet. The Service Module can also include a 15-amp ground-fault circuit interrupter (GFCI) receptacle separate from the load side of the equipment, a National Electrical Code (NEC) requirement.

When an MP580 controller is factory mounted, the Service Module will have communications and portable display ports allowing service personnel to perform diagnostics without opening the unit or controller panel.

Figure 9. AHRI Standard 430

Trane combines comprehensive performance certification by AHRI with thorough laboratory testing and advanced manufacturing methods. Together, these elements help assure that each Trane air handler operates predictably and reliably throughout the life of the unit.

Unlike other rating methods that check fan performance alone, Trane units are performance-tested in accordance with AHRI Standard 430. This certification process evaluates the air handler on the basis of airflow, static pressure, fan speed, and brake horsepower.

Heating and cooling coils are rigorously tested and certified with AHRI Standard 410 to assure that they, too, deliver published performance.

AHRI Standard 260 is the first ducted-air-handler sound rating procedure. It is intended to provide engineers with better, more accurate, ducted sound power levels so that they can design quieter and more cost-effective comfort systems. Sound ratings for Trane air handlers have been developed from extensive AHRI Standard 260 testing and laboratory data.

Figure 10. AHRI Standard 410

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Miami/Dade County Notice of Compliance (NOA) Performance Climate Changer air handlers size 3-30 are approved and have has been designed to comply with the High Velocity Hurricane Zone of the Florida Building Code. Each qualified unit shall bear a permanent label with the Trane name and logo and the statement “Miami-Dade County Product Control Approved”. Notice of compliance and additional product construction details can be found at the Miami-Dade County, Building Code Compliance Office Web site, under NOA No.

11-0926.08). Testing is currently underway for unit sizes 35-120.

UL Listing Trane air handlers are UL-listed to U.S. and Canadian safety standards.

IBC Seismic Certification Air handling equipment manufactured by Trane is capable of structurally and operationally withstanding the seismic response criteria as required by the International Building Codes (IBC) 2000,2003, 2006, 2009. Trane has third-party certification for IBC compliance for seismic applications for unit sizes 3-30. Certification for larger sizes is in process.

AMCA Certification Trane utilizes AMCA certification for airflow measuring stations. Trane certifies that the TraqTM damper shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 611 and comply with the requirements of the AMCA Certified Ratings Program.

This certification program provides the engineer and owner assurance that manufacturer-published performance ratings for airflow measurement stations are accurate and repeatable. Trane Traq dampers are certified with the integral ventilation control module (VCM) which converts differential pressure to an electronic signal for control.

Canadian Registration Number (CRN) The Canadian Registration Number, or CRN, is given to companies that comply with Canada’s Technical Safety Standards Act concerning pressure vessel safety. In Trane air-handling systems, the CRN applies to coils classified as Category H fittings. Most government and industrial customers require the HVAC supplier to have a CRN. Trane has earned a CRN for all steam and water coils. used in the Performance air handler.

ISO Certification Certification by the International Standardization Organization (ISO) ensures that an organization can consistently deliver a product or service that meets the customer’s contractual requirements by following documented processes. The ISO 9001 quality assurance model establishes the requirements for an organization whose business processes range from design and development to production. Having the quality management system of our manufacturing plants ISO 9001-certified directly benefits Trane customers because our continuous process improvements can reduce business costs, improve product quality, and enable faster ship cycles

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HVAC Design Fundamentals

In essence, an air-handling unit, or AHU, is exactly what its name implies: a device that “handles” (moves and/or conditions) air. It accomplishes this based on the functions required by a given application, as well as the arrangement of components necessary for those functions.

Trane air handlers can accommodate an extraordinary degree of design versatility, but in order to apply that versatility to each unique application, an HVAC designer must:

• Design the air handler in a manner consistent with good HVAC design practices.

• Understand the impact of ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality, and ASHRAE Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, on AHU functions and design.

• Know how specific components can address application requirements, with arrangements optimized for job requirements, thermal performance, and acoustical performance.

• Deliver the performance you have designed with a well-functioning control system.

Provide Proper Ventilation

Ventilation is the process of diluting the build-up of contaminants by introducing clean, fresh outdoor air into buildings. The lack of proper ventilation is identified as a leading cause of poor indoor air quality (IAQ) problems. ASHRAE Standard 62.1 sets the minimum ventilation rates and specifies basic HVAC equipment and system requirements to provide “acceptable indoor air quality.” ASHRAE Standard 62.1 is considered the standard of care for designers to assure good IAQ in commercial buildings.

Assuring proper ventilation levels at all operating conditions can be challenging for a designer.

Fixed outdoor-air damper arrangements on variable-air-volume systems can result in severe under-ventilation of the occupied spaces at part-load conditions. The Performance air handler is available with the patented Traq™ outdoor airflow measurement and control damper, which can precisely control the volume of ventilation air entering the system and even dynamically vary the amount in response to specific operating conditions. With the Traq damper, the amount of outdoor air can be continuously logged using a Tracer Summit™ building automation system to document proper ventilation.

Maintain Building Pressure

An important aspect of establishing outdoor-air requirements is equalizing outdoor-air and exhaust-air volumes to maintain proper building pressurization (see Figure 11). Building pressurization describes an air-handling strategy that regulates pressure differences across the building envelope and between zones or rooms by adjusting the amount of air that is supplied and removed. The goals of this strategy are to:

• Assure proper distribution of conditioned and ventilation air throughout the occupied space

• Avoid discomfort due to temperature stratification and drafts

• Prevent infiltration of unconditioned air

• Confine odors and contaminants to specific areas within the building

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Building-envelope pressurization is typically achieved by incorporating either an exhaust fan and economizer or a return fan and economizer in the air handler design. Careful analysis is required to determine which approach best suits the unique requirements of each application. To better understand the differences between exhaust-fan and return-fan systems, consult your local Trane sales representative or refer to applications engineering manual, Building Pressurization Control

(AM-CON-17).

Protect Coils from Freezing

Figure 11. Maintain proper building pressurization

Figure 12. Protect coils from freezing by addressing air stratification

Outside Air

Cold Air

Warm Air

Mixed Air

Return Air

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Filter Contaminants

Particulate Filter Guidelines

The Environmental Protection Agency (EPA) and ASHRAE recommend that the concentration of particulates in the air not exceed 0.05 mg/m3 (measured as an annual mean). This guideline is established in an EPA PM-10 standard which focuses on smaller particulates (<10 microns) that are likely responsible for adverse health effects because of their ability to reach the lower regions of the respiratory tract.

ASHRAE Standard 62.1 and the U.S. Green Building Council LEED rating system emphasize the importance of including appropriate filters in the air handling system to effectively control particulate contaminants. Both establish minimum requirements for filter performance applied within a commercial building based on ASHRAE Standard 52.2, Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size. This standard establishes a test procedure for evaluating the performance of air-cleaning devices as a function of particle size (0.3 to 10 microns). A minimum efficiency reporting value (MERV) is assigned to a filter based on its efficiency in three different particle-size ranges (0.3 to 1 microns, 1 to 3 microns, and 3 to 10 microns). A higher MERV rating indicates a greater ability to remove high quantities of small particles from air.

Figure 13. Low-limit sensor When bringing more outdoor air into the air handler to satisfy the ventilation requirements of ASHRAE Standard 62.1, it increases the likelihood of air stratification (see Figure 12). If a layer of freezing air moves through the air handler, it can damage unprotected, hydronic cooling and heating coils. Traditional freeze protection includes a low-limit thermostat (see Figure 13) (installed on the face of the cooling coil) that trips when it detects a dangerously low air temperature. When this happens, it stops the supply fan, closes the outdoor air damper, and ultimately degrades the building IAQ.

It is important to design the air handler so that it effectively treats the required amount of outdoor air—regardless of temperature—without risking coil damage, tripping the low-limit thermostat, or compromising indoor air quality. Trane has several means of providing coil protection. Choose the technique that best suits the application requirements.

• Drain the coils. This approach necessitates vent and drain connections on every coil, plus shutoff valves to isolate them from the chiller(s).

• Add glycol and an inhibitor to the cooling system water. The glycol lowers the water freezing point, and the inhibitor helps to resist corrosion.

• Introduce ventilation air downstream of the cooling coil with dual-path or bypass techniques.

• Preheat the outdoor air stream. Use a traditional or integral face-and-bypass steam coil or a hot hydronic coil to raise the air-stream temperature above freezing.

• Use a blender section (see Figure 14). This approach mixes the outdoor and recirculated air streams to address air stratification.

Figure 14. Blender

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ASHRAE Standard 62.1 recommends a minimum MERV 6 filter, while the USGBC LEED rating system recommends a minimum MERV 8 during the construction cycle and MERV 13 during normal operation. National, state, or local codes established by government bodies or occupational groups may dictate more specific or stringent filtration requirements.

Selecting the appropriate filter relies on understanding the particles that need to be filtered and their size. Table 1 provides design guidance for which filter option should be applied in your air handler.

Table 1. MERV ratings versus particle size efficiencies

MERV Value

Group 1 Avg. Eff.%

0.3 to 1.0 microns

Group 2 Avg. Eff.%

1.0 to 3.0 microns

Group 3 Avg. Eff.%

3.0 to 10.0 microns General Applications 1 n/a n/a E3<20

Residential Light Commercial

2 n/a n/a E3<20

3 n/a n/a E3<20

4 n/a n/a E3<20

5 n/a n/a 20<35 Commercial Industrial

Better Residential

6 n/a n/a 35<50

7 n/a n/a 50<70

8 n/a n/a 70

9 n/a E2<50 85 Commercial

Telecommunications Industrial

10 n/a 50<65 85

11 n/a 65<80 85

12 n/a 80 90

13 E1<75 90 90 Superior Commercial Health Care Hospitals

General Surgery

14 75<85 90 90

15 85<95 90 90

16 95 95 95

17 99.7 Surgery, pharmaceutical manufacturing

Figure 15. Use proper filtration Gases and Vapors

The presence of various undesirable gases and vapors (particularly formaldehyde, radon, oxidants, and volatile organic compounds, or VOCs) indoors can be detrimental to building occupants, materials, and contents. Controlling VOC concentrations is particularly challenging—hundreds of them are present, few are unique to any one source, and there are many potential sources, some of which emit several VOCs.

A common way to control gaseous contaminants is to dilute them with outdoor air. This approach is appealing because many VOCs defy individual treatment.

However, it is only practical if the quality of the outdoor air is suitable and if the resulting supply airflow is consistent and appropriate and if it mixes effectively with the air in the occupied space.

Another approach is to neutralize the contaminants in the air. This can be done through air cleaning mechanisms UVc/PCO technology to reduce volatile organic compounds (VOC’s) through photocatalytic oxidation without the creation of ozone or by-products.

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Minimize Microbial Growth

Water Management

Cooling coils collect water from the passing air stream as they cool and dehumidify it. If not properly addressed, this condensed moisture encourages mold, mildew, and other microorganisms to colonize and breed. To reduce the likelihood of microbial growth:

• Reduce moisture carryover by sizing the cooling coils for proper airflow velocities. Trane coils can be sized for velocities in excess of 625 fpm without moisture carryover, depending on air conditions, coil size, and coil-fin type and spacing. Refer to “Coils” section on page 155 for the moisture-carryover curves and details about allowable velocities.

• Specify drain pans sloped in two planes to eliminate stagnant water conditions and to promote positive drainage.

• Locate coils on the second level of a stacked air handler to provide adequate trapping height.

• Properly size condensate traps to ensure proper drainage. See Figure 17.

• Promote cleanability by providing adequate space around the unit, easily removable access panels, and a solid steel liner to isolate insulation from the air stream and to facilitate cleaning.

Also, provide extended drain pans to allow for periodic cleaning.

• Condition the mechanical equipment room to prevent condensation on piping, ductwork, mechanical equipment, and other surfaces.

Figure 16. Keep surfaces clean Although filtration effectively removes a number of common particulate and gaseous contaminants from the building environment, microbiological, or microbial, contaminants such as fungi (mold and mildew) and bacteria are sometimes too small to be filtered entirely from the air stream. To help control microbial growth, design the air handler to include:

• Non-porous, cleanable interior wet surfaces

• Easy access to all areas of the air handler for inspection, service, and cleaning.

• Use of ultraviolet (UV) germicidal irradiation lights

Regular cleaning and disinfecting with nonpolluting cleansers and antimicrobial coatings also helps, but none of these measures totally eliminates the growth of ever-present microorganisms. Consequently, moisture control becomes another important means of combating microbial contaminants.

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Dehumidification

ASHRAE Standard 62.1 observes that “high humidities can support the growth of pathogenic or allergenic organisms” and suggests that the relative humidity of the occupied space not exceed 60 percent. Higher humidities also require lower supply-air temperatures for thermal comfort.

Most climates require dehumidification to achieve this design goal. Dehumidification can be accomplished by removing moisture from the air, that is, condensing the water vapor on cooling coils.

However, cooling coils can over cool the occupied space when dehumidifying at sensible part-load conditions. There are several ways to control to both humidity and temperature at part load conditions.

• Use a VAV air handler versus a constant volume air handler. This can improve part load dehumidification.

• Use desiccant dehumidification systems to dehumidify and control humidity to very tight tolerances.

• Use a split dehumidification unit (SDU) to improve dehumidification by treating the ventilation air separately.

• Use a s Dedicated Outside Air Unit, DOAS, to dehumidify the ventilation air.

Figure 17. Drain pan trapping for positive and negative pressure applications

H

J

L

Drain pan trapping for section under negative pressure

L = H + J + pipe diameter where:

H = 1 inch for each inch of negative pressure plus 1 inch J = 1/2 H

Drain pan trapping for section under positive pressure

L = H + J + pipe diameter where:

H = 1/2 inch (minimum) J = 1/2 inch plus the unit positive static pressure at coil discharge (loaded filters)

CLCH-PRC022A-EN 25

• Use a reheat coil, which can be accomplished using recovered condenser heat energy or with standard electric or hot water coils.

Humidification

Low relative humidity - below 30 percent - in an occupied space is also undesirable because it requires higher supply-air temperatures for thermal comfort and promotes static electricity.

Raising the space humidity to an appropriate level requires a humidifier to inject water particles into the passing air stream. To avoid promoting microbial growth, the unit design must assure that the injected water is fully absorbed within the air handler without collecting on its walls or components.

Three types of commercial humidifiers are generally used in central-station air-handling systems:

wetted media, atomized water, and steam. Of these types, ASHRAE Standard 62.1 prefers steam “as the moisture source for humidifiers.” The temperature and pressure properties of steam make it easy to introduce directly into the passing air stream and encourages complete absorption in a short distance. Trane standard humidifier sections incorporate all the distance required for absorption to occur.

Application Considerations:

• Never position the humidification section immediately downstream of a housed fan or blow-thru coil section.

• Extra dispersion distance may be needed if the humidification section is placed upstream of a final filter or electric heat coil.

• Vertical airflow turns immediately upstream and downstream of the humidification section necessitate a large section.

Provide Quiet Comfort

Trane sound power ratings cover eight octave bands (63–8000 Hz). Data is collected in one of Trane’s ANSI 12.32-qualified reverberant rooms.

Figure 18. Trane acousticians collect and test sound data

Acceptable sound levels inside a building can improve occupant comfort and productivity. In fact, achieving an acceptable acoustical environment today is almost as important as simply conditioning it. To meet space sound levels, be sure to optimize the noise source (the air handler) using path attenuation (ducts, wall, and room carpeting).

The sound source can be projected using Trane TOPSS selection program or with the Trane CLCHLw program. The sound path can be projected using the Trane Acoustical Program (TAP). Compare the resulting NC projection with the designed value. If the NC projection is too high, the air handler can be made quieter with a selection focused on acoustics, or the path attenuation can be increased—or both strategies can be combined. In the end, the projection should meet the NC requirements for your job.

Creating quiet spaces is increasingly difficult because of the trend toward “IAQ-hardened” systems. “IAQ hardening” involves removing fiberglass insulation, which acts as a sound absorber, from inside the ducts and even the units. Without this insulation, the air handler makes too much noise.

With Trane’s acoustic options and the TOPSS selection program, you can create the unit you need for your quiet application. With these options, you can select an air handler that is more than 20 dB quieter than a conventional unit. The starting point is the Trane AHRI Standard 260 sound database.

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To determine the most cost-effective acoustical solution for a given application, follow these steps:

Select the unit and predict the unit sound power using the TOPSS selection program.

Project the…