Trane Dedicated Outdoor Air Systems Brochure

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Trane® Dedicated
Outdoor Air Systems

Trane dedicated outdoor air systems:
Improving indoor air quality and lowering HVAC costs

High indoor
occupancy levels,
busy kitchens and
shower facilities can
significantly increase
indoor humidity
levels—which can
make occupants
uncomfortable.

Achieving acceptable indoor air quality can be

Breathe easier with lower energy bills

difficult—especially when using some traditional

Trane dedicated outdoor air systems can be

packaged rooftop HVAC systems. Many of

an energy-saving partner for your heating

these systems don’t have the latent capacity

and cooling system, allowing it to work more

to effectively manage high humidity levels,

efficiently. When incorporated as part of an

which can result in uncomfortable conditions

HVAC system’s total design, a Trane dedicated

for building occupants—even when packaged

outdoor air system can mean smaller, less-

rooftop HVAC systems are operating at full

expensive, more energy-efficient local or zone

capacity and consuming high amounts of energy.

terminal devices can be specified, saving money
on first costs. A Trane dedicated outdoor air

Adding a Trane® dedicated outdoor air system

system can pay for itself in a short amount of

can not only improve indoor air quality, but also

time, saving you money on first costs and utility

reduce HVAC operating costs. By cooling and

bills. And with a life span of up to 20 years or

filtering outdoor air before directing an optimal

more, you can expect a Trane dedicated outdoor

amount of it into a building, a Trane dedicated

air system to save money on utility bills for a long

outdoor air system can not only help maintain

time to come.

compliance with ASHRAE 62.1 ventilation
standards, but also can decrease indoor humidity
and reduce the load on HVAC systems. The
result is improved occupant comfort and lower
utility bills.
2

Code compliance: Following regulations
with proper ventilation

The benchmark method for improving a building’s

Trane dedicated outdoor air systems are an ideal

unless that outdoor air is properly conditioned,

way to ensure full compliance with ASHRAE

it can bring with it undesirable temperatures,

62.1 ventilation standards. Integrated with Trane

humidity and contaminants. Trane dedicated

controls, Trane dedicated outdoor air systems

outdoor air systems can be the single best

can precisely deliver the right amount of outdoor

way to quickly and economically improve your

air into your building, not only ensuring full

building’s IAQ by properly conditioning outdoor

compliance with applicable building codes that

air, controlling its humidity and filtering out

reference ASHRAE 62.1, but also meeting or

contaminants.

IAQ is the introduction of fresh outdoor air—but

exceeding the air pressure specifications of your
building’s design. The benefits include:

Humidity control—Trane dedicated outdoor
air systems contain a specially designed six-row

•	 Avoiding monetary building code penalties
and/or mandated corrective action
•	 Mitigating the infiltration of high-humidity
outside air
•	 Having the capacity for increased ventilation
rates to meet future requirements

evaporator coil that can quickly dehumidify
incoming outdoor air—and is optimally
engineered to maximize both moisture removal
and energy savings.
Contaminant removal—Multiple types of
air filters are compatible with Trane dedicated
outdoor air systems to keep pollen, dust and

Indoor air quality: Improving the life of
your building, improving the life of its
occupants

other outdoor air contaminants from entering

Various factors can influence a building’s indoor

Microorganism control—Trane dedicated

air quality (IAQ), including humidity, the presence

outdoor air systems are available with a UV-C

of contaminants and more. Good IAQ contributes

band irradiation light to inhibit the growth of

to occupant comfort—and comfortable building

microorganisms that otherwise could thrive on

occupants are less likely to have work absences,

the wet surface of an evaporator coil, keeping

can be more productive, and are more likely to

them out of the air that passes through the

remain building tenants longer. Additionally, a

evaporator coil and into your building’s interior.

your building.

Comfortable building
occupants are less
likely to have work
absences, can be more
productive, and are
more likely to remain
building tenants
longer.

building with superior IAQ can deliver higher
rental income.

3

Humidity control:
Key to comfort. Key to cost savings.
Here’s how a Trane dedicated outdoor air system
can give your building higher indoor air quality
(IAQ) and lower utility costs.
• 	 When outside air is humid, Trane dedicated outdoor air
systems use a chilled evaporator coil to dry that air to a
lower dew point before bringing it inside the building.
• 	 Bringing outdoor air with a lower dew point inside
a building means significantly less air is needed for
dehumidification and to maintain optimum indoor
comfort—and smaller motors, compressors and
ductwork can be used.
When outdoor air is excessively humid, an HVAC system is

- 	 Smaller HVAC systems cost less to purchase, saving

immediately challenged to reduce that humidity. The problem

money on the initial equipment investment.

only gets worse when additional sources of indoor humidity are
added—which occurs when occupancy levels are high, or when

- 	 Smaller HVAC systems consume less energy, for lower
operating costs throughout the life of the system.

buildings incorporate rooms that naturally produce humidity,
like large kitchens and shower facilities. The result can be an
overworked HVAC system that consumes a lot of energy while

• 	 By bringing 100 percent outdoor air into the building, a

still failing to bring humidity levels within the ASHRAE 55/

Trane dedicated outdoor air system can easily meet or

Berglund recommended comfort zone.

exceed typical minimum ventilation requirements for
maximum IAQ.

Trane® dedicated outdoor air systems are specifically designed
to cool and dehumidify 100 percent outdoor air. Compared

• 	 With their combination of high energy savings and

to a system using a traditional packaged rooftop HVAC unit,

high IAQ, Trane dedicated outdoor air systems can earn

a system that incorporates a Trane dedicated outdoor air

buildings LEED® credits.

system into its design not only can maintain required indoor
ventilation levels, but also can use significantly less energy.
That can be an enormous cost savings, since an HVAC system
can represent up to 60 percent of the energy use in a typical
occupied building.

4

 

Dehumidification by design: high-performance
humidity control
Air conditioning units are designed to cool air; their dehumidification
abilities aren’t optimized for maximum effectiveness and efficiency. A Trane
dedicated outdoor air system can quickly bring indoor humidity under

Trane dedicated outdoor air
systems: a perfect match for
nearly any HVAC system

control with components specifically designed to handle the process.
Trane dedicated outdoor air systems can
• 	 Six-row evaporator coil—This 12-fins-

be designed to integrate seamlessly into

per-inch evaporator coil is precisely

many HVAC system designs, making them

engineered to manage the dehumidification

perfect for both retrofit and new construction

process. When activated, it maintains

projects. In some cases, Trane dedicated

a temperature of 38° F — an optimal

outdoor air systems can even serve as

temperature for quickly removing moisture

standalone devices.

from air while avoiding coil icing.
All commercial HVAC designs require a certain
• 	 Hot-gas reheat coil—After dehumidifying, outdoor air can be

amount of outdoor air to be introduced to

uncomfortably cold. The hot-gas reheat coil raises its temperature to a

the system. Due to their versatility, Trane

more-comfortable — but still cool — temperature. The cool, dehumidified

dedicated outdoor air systems can play a key

air is then ducted to the building’s interior or to terminal devices.

role in nearly any HVAC design, including:

– 	 To maximize energy efficiency, the hotgas reheat coil is warmed with heat
energy captured from the operation of the
compressor that chills the evaporator coil —
an effective energy-conserving strategy.

• 	 Constant-air systems
• 	 Variable-air-volume (VAV) systems
• 	 Fan coil units
• 	 Unit ventilators
• 	 Water-source heat pumps
• 	 Variable refrigerant flow (VRF) systems

– 	 The hot gas reheat coil is located a minimum
of 6 inches away from the chilled evaporator
coil, both to avoid affecting the chilling
performance of the evaporator coil, as well as
to avoid re-evaporating the condensed water
back into the air. Strategic distancing of the
hot gas reheat coil from the evaporator coil
makes the overall dehumidification process

6"

more efficient.
5

Comfort and cost savings:
How Trane dedicated outdoor air systems benefit people and budgets
Trane® dedicated outdoor air systems include numerous advanced features that help deliver efficient, effective performance.
Engineered to integrate with nearly any kind of HVAC design, a Trane dedicated outdoor air system can give your building more
indoor comfort and lower energy bills.

Energy recovery cassette — This

Six-row evaporator coil — Efficiently

Digital scroll compressors — by

optional energy-saving device recovers

and economically cools and

operating at constant speed and digitally

thermal energy from exhaust air,

dehumidifies outdoor air.

controlling position of the orbital scroll

reducing utility costs.

in relation to the fixed scroll, very precise
capacity matching at part load conditions
can be achieved.

More benefits for your building — and you
Reduced-size HVAC components — HVAC
components can be smaller in size, due to the Trane
dedicated outdoor air system’s ability to precondition
outdoor air. Smaller equipment can have a lower first
cost—and use less energy for reduced operating costs.
Smaller ductwork — The Trane dedicated outdoor air
Fully modulating indirect-

High-efficiency plenum

system helps the HVAC system provide all the indoor

fired gas burner — Delivers

fan — Premium-efficiency

comfort required using less air—and using smaller

the precise amount of heat

direct-drive motor with a

ductwork, which costs less.

called for by demand levels,

variable-speed drive powers

saving energy and utility

backward-curved blades to

Lower-power electrical riser — An HVAC system

costs.

efficiently move air.

enhanced with a Trane dedicated outdoor air system
uses less electricity, so it requires a lower-power
electrical riser — another first-cost saving.

6

Carefully designed with less maintenance in mind
Trane dedicated outdoor air systems are engineered not only to be easy to maintain, but also to need less maintenance altogether.
Thoughtful design features and durable components help make Trane dedicated outdoor air systems easier to keep running at peak
efficiency longer—and more affordably, too.

D

B

C

A

A

B

Easy slide-out access — Makes servicing the plenum

D

Easy-change air filter holder — Allows fast, tool-less

fan/motor combination and optional energy recovery

filter changes — and quick adjustment for switching

cassette fast and easy.

between 2-, 4- and 6-inch filters.

Beltless fan motor — Direct-drive design means no belts

25-year warranted heat exchanger (not shown) — 

to break or change.

Long-life type 409 stainless steel construction for superior
oxidation and corrosion resistance.

C

No-tool, reversible access doors — The access doors
on Trane dedicated outdoor air systems don’t require tools

Optional electro-fin coating (not shown) — Protects

to open, and their reversible hinges and handles make

coils from environmental corrosion for longer service life.

opening easier in tight-fit installations.

7

Trane solutions:
Making buildings better for life
Performance
Trane® products are designed, engineered, built and tested to
provide exceptional performance. Trane dedicated outdoor air
systems efficiently provide conditioned 100 percent outdoor
air to a building’s interior, improving IAQ and reducing energy
costs—an HVAC solution that honors a long legacy of indoor
comfort solutions developed by Trane.

Innovation
Trane was built on the belief that innovative leadership can
address virtually any challenge. Trane dedicated outdoor air
systems help efficiently solve IAQ challenges, and have earned
their place in a century of Trane technological breakthroughs in
the science of HVAC solutions.

solution that will provide years of service and satisfaction.
Because Trane offers a wide variety of products—including
Trane dedicated outdoor air systems—we are uniquely able to
match every customer with a system or combination of systems
that’s right for them.

Knowledge
To become and remain an industry leader requires a full
understanding of existing knowledge and a never-ending
quest for new discoveries. For one hundred years, Trane has
built and maintained its leadership status in the HVAC industry
by employing the brightest and most inquisitive scientists,
engineers and design experts—all of whom share a singular
passion to know and explore the ever-evolving technology that
improves the lives of our customers.

Commitment
Our commitment to customer satisfaction is what has kept
Trane an industry leader for more than a century. Carefully
listening to our customers and truly understanding their needs
is the surest way for us to recommend the right indoor comfort

Visit Trane.com/OAU for more information on Trane dedicated
outdoor air systems—or contact your local Trane account
manager to learn more.

Scan the code to learn more
about the all-new Trane
dedicated outdoor air systems.

Ingersoll Rand (NYSE:IR) advances the quality of life by creating and sustaining safe, comfortable and efficient
environments. Our people and our family of brands—including Club Car®, Ingersoll Rand®, Schlage®, Thermo King® and
Trane®—work together to enhance the quality and comfort of air in homes and buildings; transport and protect food
and perishables; secure homes and commercial properties; and increase industrial productivity and efficiency.
We are a $14 billion global business committed to a world of sustainable progress and enduring results.

ingersollrand.com

We are committed to using environmentally conscious print practices.

© 2013 Ingersoll-Rand Company

OAU-SLB003-EN
July 17, 2013



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