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ComPac® Photo ComPac® I & ComPac® II

The ComPac® I and ComPac® II air conditioners are the world's foremost air conditioners for use in cooling telecommunications shelters and enclosures. Both the ComPac I and ComPac II air conditioner have the necessary controls and safeties for operation in cool or cold weather. The primary difference in the two units is that the ComPac® II has a factory installed economizer. The economizer cycle uses outside air, when cool and dry, to cool the telecommunications equipment. The economizer cycle can reduce run time on the compressor by up to 75% thereby extending compressor life, reducing downtime, and energy costs.

Three model lines of ComPac air conditioners are built - the AVPA line, the HVPA line and the HVEA line. The HVEA line is our most efficient units with EER's (Energy Efficiency Ratio) up to 13.1 and feature an electronically commutated outdoor fan motor. The HVEA units have EER's up to 11.4 and the AVPA units have EER's that range from 9.00 to 10.30.

The ComPac® I and ComPac® II are built in cooling capacities of 1, 2, 2-1/2, 3, 3-1/2, 4, 5 and 6 tons. Units are built for operation on a variety of electrical supplies - 208/230v, 380v, and 460v and for either 50Hz or 60Hz. Units are tested to Underwriters Laboratories Standard, listed by ETL, and rated according to the Air Conditioning and Refrigeration Institute Efficiency Standard 390.

The HVPSA and HVESA lines are available with 2-stage compressors on the 3, 3-1/2, 4 & 5 ton models. First stage cooling is approximately 65% of the total cooling capacity. The 2-stage compressor provides lower start-up amps which can be critical when operating with a generator. The two stage compressor also reduces energy costs and is able to more precisely match the cooling capacity of the air conditioner with the heat load in the shelter. Both ComPac I and ComPac II units are available with 2-stage compressors.

Special Environmental Packages

The Extreme Duty Package allows selected Marvair wall mount air conditioners to operate in extremely cold and hot ambient conditions. The Extreme Duty Kit is always factory installed and is available on HVPA and HVEA models.

For non-economizer units, the Extreme Duty designator is "D". These units will operate from 0° F to 130° F (-18° to 54°C). For economizer units, the Extreme Duty designator is "E". These units will operate from -20° F to 130° F (-29° to 54°C).

The Extreme Duty Package includes the following:
  • Suction line accumulator
  • Thermal expansion valve (TXV)
  • Crankcase heater (not required on scroll compressors)
  • Hard start kit
  • An auto reset high pressure switch
  • Outdoor thermostat and fan cycle switch. The fan cycle control is standard on ComPac air conditioners & operates based upon the liquid line pressure. The outside thermostat opens whenever the outside temperature is below 50° F (10°C) and closes when the outside temperature is 50° F (10°C) or higher. Whenever the temperature is below 50°F (10°C), the fan cycle switch is in the circuit; when temperatures are 50° F (10°C) or higher, the fan cycle switch is not in the circuit. The outdoor thermostat is used with a TXV to prevent excessive cycling or "hunting" of the TXV.
  • Dehumidification package - Field or factory installed controls allow humidity to be maintained at or below a specified humidity set point. Dehumidification is achieved by operating mechanical cooling in conjunction with electric reheat. These units do not have the ability to add humidity to the building.
  • Hot Gas Bypass - Factory installed refrigeration controls permit near continuous operation of the compressor. Used in specialty structures, e.g. magnetic resonance imaging (MRI) and television broadcast buildings to eliminate voltage spikes caused by the compressor starting and stopping.
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