Cellular Radio Paging Microwave/ Satellite Earth Station PCS Utility Shelters Mobile Medical Equipment Vehicles Commercial Buildings CATV Mobile Electronic Structures Wireless Digital Cooling Units Designed and Built for the Communications Industry RBOC
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. 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. 2 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 2" pleated filter Front control panel allows easy access and complies with NEC clearance codes on redundant systems Timed low pressure by-pass for start-up of A/C in cold weather (ComPac I 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 Copper tube, aluminum fin evaporator and condenser coils Mixed air sensor modulates damper to prevent thermal shock of electronic components Dry contacts for remote alarm on lock-out High pressure switch with lockout relay and auto reset low pressure switch protect refrigerant circuit. 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. Marvair s ComPac II Air Conditioner A Marvair First - Factory Installed Economizer - ComPac II A/C Only 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. 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. 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. 3
Marvair Environmental Control Units 4 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 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... 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: 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. 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. 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). 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. 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. *See ComPac Product Data Sheet for details. 5
CommStat 3 & LL357A1 Controllers and Accessories Factory Selected Accessories Optimize Performance of Marvair Units ComPac A/C and ECU Accessories: Supply Grille Return Filter Grille Return 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. 6
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 parts warranty. SILVER S E R V I C 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