Telecom Brochure_403.qxd

Cellular
Radio
Paging
Microwave/
Satellite
Earth Station
PCS
Utility
Shelters
Mobile
Medical
Equipment
Vehicles
Commercial
Buildings
CATV
Mobile
Electronic
Structures
Wireless
Digital
RBOC
Cooli ng Units Designed and Built
for the Communications Industry
Air Conditioning Innovations for
theTelecommunications Industry
In our communications-based society, technologies
are being developed and used on a daily basis that
impact all of our lives. A key element of the entire
new global network of communications systems circling our cities and running parallel to our roadways
are the shelters containing the electronic equipment.
These shelters require air conditioning during most, if
not all, of the year, to offset the high heat loads of
the electronic equipment inside and ensure smooth
operations. Reliable Marvair™ Air Conditioners
keep the network operating whatever the outdoor
conditions.
In the early l980’s, Marvair™ developed innovative
air conditioning units specifically for the emerging
communications market. Marvair continues to be the
preferred choice for communications applications on a
worldwide basis because they are durable, easy to
install and perform reliably year after year.
Efficient Air Conditioning Systems
for All Telecommunications
Applications
With the telecommunications industry changing
so quickly – cellular, cable, wireless, satellite, 2.5 & 3G
– companies have made a sizable investment to
ensure that the electronic equipment vital to the communications operations work reliably inside the shelter.
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Marvair’s full line of air conditioning products from onehalf ton to six tons are designed and manufactured to
cool communications shelters, huts and cabinets. Units
are available for many voltages and most international
power supplies.
Marvair™ combines expertise in design, manufacturing and industry knowledge to be uniquely qualified to
provide the air conditioning units you need today.
Marvair™ Products are Flexible,
Cost-Efficient Solutions for Today
& Tomorrow
The optimum in cooling, Marvair’s ComPac® Series is
designed and built with all of the controls needed for
cooling your communications shelter for any season.
The ComPac II models have a built-in economizer, to
take advantage of using outside air during lower
temperatures to cool the building. The economizer
cycle can reduce the run time on the compressor by up
to 75%, extending compressor life and the longevity of
the air conditioner. The ComPac I air conditioners are
ideal for tropical or subtropical environments or where
corrosive outside air may damage sensitive telecommunications equipment.
Marvair™ units are used to cool
utility structures, mobile electronic
equipment vehicles, mobile
medical equipment vehicles and
commercial buildings.
Marvair’s ComPac® Series of Air
Conditioners -TheIndustryStandard
Baked on polyester
finish over tough
galvanneal steel for
maximum cabinet life
Copper tube, aluminum fin
evaporator and condenser coils
Mixed air sensor modulates
damper to prevent thermal
shock of electronic components
2" pleated filter
Front control panel
allows easy access and
complies with NEC
clearance codes on
redundant systems
Dry contacts for remote
alarm on lock-out
High pressure switch with
lockout relay and auto reset
low pressure switch protect
refrigerant circuit.
Timed low pressure
by-pass for start-up of
A/C in cold weather
(ComPac® I A/C only)
A Marvair™ First - Factory
Installed Economizer ComPac® II A/C Only
Low ambient control
cycles condenser fan
to regulate refrigerant
pressures
Time delay/anti-short
cycle timer
Economizer
damper motor
Enthalpy controller
High efficiency
scroll compressor
Mar
vair
’
Air s ComP
Con
diti ac ® II™
one
r
For Durability and
Versatility, the ComPac™
Air Conditioning Units
Have No Match.
Tens of thousands of these ComPac®
air conditioners are now in service
around the world. Built for ease of
installation and reliable operation, these
units can be found on shelters wherever
you look.
ComPac® models provide the air
conditioning solution for a wide range
of conditions and applications: cellular,
wireless shelters, microwave stations,
PCS, utility shelters and mobile electronic
equipment vehicles. With the built-in
economizer, they offer more reliable
operation and energy efficiency.
The ComPac® II A/C’s economizer
system makes this unit an outstanding
choice for efficient, long-term communications shelter cooling. The ComPac II
A/C is controlled by a signal from the
wall mounted indoor thermostat when
cooling is required, whether mechanical
cooling with the compressor or free
cooling with the economizer. A factory
installed enthalpy controller determines
whether the outside air is to be used,
and if suitable, the compressor is locked
out and the economizer damper opens to
bring in outside air. The temperature at
which the economizer opens is
adjustable from 53°F (12°C) at 50%
relative humidity to 78°F (46°C) at 50%
relative humidity.
Following the enthalpy control activation, the mixed air sensor measures the
temperature of the air entering the
indoor blower from the outside and
modulates the economizer damper to
supply the precise ratio of indoor and
outdoor air for a discharge temperature
of 50° to 56°F (10° to 13°C) to prevent
thermal shock of the electronic components. The compressor will not operate
when the economizer is functioning. If
the outside air becomes too hot or
humid, the economizer damper closes
and mechanical cooling is activated.
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Marvair™ Environmental
Control Units
Marvair™ Environmental Control Units (ECU) were
designed for the rigorous requirements of the
telecommunications cabinet. Like Marvair ComPac®
series of air
conditioners,
the MiniPac™,
SlimPac™ and
DoorPac™ ECUs
have the
specialized
controls and
features needed
to operate over
a wide range of
ambient conditions. Their
quiet operation permits them to be installed in areas
where low sound levels are important.
Standard Features
• High pressure switch with lockout relay and automatic
reset low pressure switch protects refrigerant circuit
• Adjustable compressor time delay
• Dry contacts for remote alarm or notification upon
lockout
Low Temperature
Start-Up and Operation
• Low ambient control cycles
condenser motor to maintain proper refrigerant
pressures
• Timed low pressure by-pass
for start-up of compressor
when outdoor temperatures
are below 55°F (13°C)
Rugged Construction
• Metal cabinet with bakedon, weather resistant finish
• High efficiency compressor
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• Copper tube, aluminum fin
evaporator and
condenser coils
• Decorative coil guard protects condenser coil
SlimPac™ ECU
The SlimPac™ ECU is built in cooling capacities of
12,000 and 18,000 BTUH. With its unique profile,
the SlimPac ECU mounts quickly on the exterior of a
cabinet on either side of the splice chamber.
MiniPac™ ECU
The MiniPac™ ECU has nominal cooling capacities
from 4,400 to 8,000 BTUH. The use of a condenser
blower and an over/under condenser air intake and
discharge design allows the unit to be installed with
a minimum of clearance around the sides.
DoorPac™ ECU
The DoorPac™ ECU has a nominal cooling capacity
of 12,000 BTUH and is installed through the door or
a telecommunication cabinet. This unique design
minimizes the exterior space required.
ECU60
As more telecommunication equipment is added to
existing shelters, heat loads increase and more cooling is required. The Marvair™ ECU60 provides an
ideal solution to this problem. The ECU60 is designed
as a field replacement for
Marvair’s 3 Ton ComPac® I air
conditioner. The unique
design eliminates the need to
cut new openings in the shelter. It has the same size supply and return openings as
the AVP36 but with 50%
more cooling capacity.
When you need to increase
the cooling capacity and your
current unit is the ComPac® II
air conditioner with the built-in
economizer, we can provide a
wall curb that mounts on the
side of the shelter. This curb
provides a transition from the
existing openings to a 5 Ton
ComPac II air conditioner.
Speciality Air Conditioners
and ECUs
From the Deserts of the Mid-East to
the Arctic Tundra, Communications
Continue Thanks to the Marvair™
Air Conditioning Capabilities...
• Hot Gas By-Pass – ComPac® I A/C only – Used in
specialty applications to prevent magnetic voltage
disturbance caused by compressor cycling. Two hot
gas by-pass option packages are available to allow
operation to 20°F (-7°C) or minus 20°F (-29°C).
As the communications industry expands further
across the globe, outside conditions for the communications shelters will differ greatly while the internal
components will still need to be cooled and maintained
at a consistent temperature for reliable operation.
Marvair™ Air Conditioning units offer solutions to the
changing landscapes and provide more versatility than
any other type of communications cooling units. What
this means to our customers is that the ComPac® I and
ComPac II units can be easily modified at the time of
order to suit special conditions or climate requirements.
Our option packages include:
• Counterflow - ComPac® I and II A/C - Units can be
built with air flow from the bottom of the unit for
under-floor air conditioning or special requirements.
Harsh Environment Conditions*
• Climate Options – The Extreme Duty Package consists of various components and controls to allow
Marvair™ ComPac® II units to operate from -20°F
(-29°C) to 130°F (54°C) and the ComPac I units to
operate from 0°F (-18°C) to 130°F (54°C).
• Coastal Environment Kit – ComPac® I A/C only –
Protective coatings added on selected internal
components when units are to be installed near
an ocean or sea.
• Protective Coil Coatings – Either the condenser coil
or evaporator coil or both can be coated with a
protective coating. Used in marine or corrosive
environments such as power plants, paper mills and
applications susceptible to salt-spray.
• Stainless Steel Cabinet – ComPac® I A/C only – all
exterior sheet metal constructed of stainless steel for
high durability or unusual weather conditions.
Special Purpose*
• Dehumidification Kit – ComPac® I and II A/C –
Humidity Controller bypasses cooling thermostat and
allows electric heat to operate simultaneously.
Marvair™ DualPac™ Air Conditioners
The DualPac™ air
conditioners are unique
in that they incorporate
two independent air
conditioning systems
within a single cabinet.
This provides redundancy without the need
for two separate units.
The units have two
compressors, two
condenser coils, a separately
circuited evaporator coil, separate controls, one
evaporator blower motor and one condenser fan motor.
The DualPac™ air conditioners are especially
effective in sites where the heat load is expected to
increase as new communications equipment is added
due to growth of system demand. Matching cooling
capacity with cooling needs, results in improved
reliability because of fewer start/stop cycles and more
precise temperature control within the enclosure.
Marvair™ Custom Units
Marvair™ combines expertise in design, manufacturing and industry knowledge to provide air conditioning
systems and solutions for what you need today.
Shelters, cabinets, huts, unique shelter designs, tight
dimensions or unusual capacity requirements are not a
problem; we can build a custom solution. Marvair
continues to monitor the telecommunications industry
and develop new products to solve unique cooling
situations and respond to market changes.
• High Filtration Package - ComPac® I and II A/C Units are built with up to 95% efficient filters.
ComPac II units have a prefilter on outside air.
*See ComPac® Product Data Sheet for details.
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CommStat 3™ & LL357A1
Controllers and Accessories
Factory Selected Accessories
Optimize Performance of
Marvair™ Units
ComPac® A/C and ECU Accessories:
• Supply Grille
• Return Grille
• Return Filter Grille
• Thermostats & Sub-Bases
Marvair™ Lead/Lag Controllers
Marvair™ lead/lag controllers will operate a fully or
partially redundant air conditioning system providing two
stages of cooling and two stages of heating. The controllers insure equal wear on both air conditioners or
ECUs while allowing the lag unit to assist upon demand.
CommStat 3™ Solid State Controller with user
defined set points. LEDs indicate control power, function
(heating or cooling
of each unit), the
lead unit and high
or low refrigerant
pressure lockout. A
digital display shows
temperatures in
either Fahrenheit or
Celsius. The comfort override button temporarily overrides set points for 90 minutes to provide a comfortable
working environment for personnel. The lead/lag
changeover is programmable in 1/2 day increments
from 1/2 to 7 days.
Five alarm relays - power, low building temperature,
high building temperature, refrigerant pressure lockout
and smoke alarm - can be used for remote alarm or
notification.
The CommStat 3™ Controller is factory programmed
with standard industry set points, but set points can be
quickly and easily changed in the field.
LL357A1 Controller has silent, dust-free mercury
switches operated by coiled bi-metallic elements. The
solid state timing device provides lead/lag switch over
every 3-1/2 or 7 days and retention for up to one hour
on power loss. The LL357A1 controller has an auto system switch, locking cover and adjustable locking temperature lever screws. To facilitate service, a push
button mounted on the timing module switches the lead
to the lag unit after being depressed for 3 seconds.
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Customer Service Network,
Spare Parts Kits & Warranty
Marvair™ Nationwide Network
of Service Contractors
Most companies want an air conditioning system
on their communications shelters that they can put in
the field and walk away from. Marvair™ air conditioners are designed for years of reliable operation.
However if service is required, Marvair™ has a
Nationwide Network of Service Contractors to
quickly investigate problems and bring units quickly
back on line. The communications industry has a
critical need for quick and reliable response to
problems. Considering the investment and loss of
revenue when a shelter goes down, it makes sense
to use an air conditioner designed and built for this
type of use, and also deal with a company that has
contractors available throughout a network to
service and maintain the integrity of the air
conditioning system.
In the United States., simply call our toll free
number: 800-841-7854, for the closest service
contractor.
Marvair™ “Spare Parts Kits”
Communications shelters are not always in the
easiest to reach places, and for that reason,
Marvair™ also sells many customers a “Spare Parts
Kit” – a complete inventory of many components
that will allow easy service and rapid repair of a unit
in situations where downtime is critical.
Silver Service™ Warranty
As an added service to our customers, we can
provide an extended warranty on our air conditioning
units. The optional extended Silver Service™
Warranty offers first
year limited labor
warranty in
addition to the
standard Marvair™
C E
I
parts warranty.
R V
R
E
V
SIL
S E
Nationwide Network of Service Centers
7
156 Seedling Drive ◆ Cordele, GA 31015
Phone: 229-273-3636 ◆ Fax: 229-273-5154
Email: marvair@ airxcel.com ◆ www.marvair.com
April 2003
Supersedes June 1999