Air Conditioners Aermec PXO, PXU, PWO, PWU Data sheet

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even in emergency situations, if the machines are equipped with two compressors or the plant has multiple machines. Survey has a wide range of auto-diagnosis functions and can also completely manage all the alarms. Scroll compressors Extremely quiet scroll compressors with high energy effi ciency have been installed in the direct expansion units. They offer a signifi cant reduction in energy consumption and therefore allow the impact on the environment to be limited. In fact, scroll compressors give higher volumetric performance than alternative ones at equal yield capacity. In addition, the absence of valves eliminates the pressure drop which is characteristic of the alternatives, allowing an increase in energy effi ciency in equal conditions. The scroll compressors used in the “P” Series air conditioners are selected from the most effi cient and reliable models available from highly qualifi ed international constructors. Single or double refrigerant circuit The models with “1” as the last digit of the numerical part of the identifi cation code have a single circuit and a single compressor. Those with “2” as the last digit on the other hand have two completely independent refrigerant circuits and two compressors. The installation designer can therefore choose to use a single compressor machine or one with two compressors which offers 50% redundancy. The circuits are fi tted with all the safety and regulation devices necessary for effi cient and 7
8 reliable operation. The evaporator coil can be single or double circuit depending on the number of compressors. Electronic expansion valve Electronic expansion valves are one of the most recent pieces of equipment to improve the energy effi ciency at partial loads of direct expansion machines. These valves are installed at the inlet of the evaporator, substituting the traditional thermostatic expansion ones. This permits much more precise control of the quantity of refrigerant entering the evaporator dependent on the effective requirement of the load, thus guaranteeing good capacity regulation between 100% and 50%. Electronic expansion valves also enable the amount of overheated gas at the outlet of the evaporator to be controlled, thus allowing a signifi cant reducing of the condensation pressure during winter or night-time operation whilst maintaining the evaporation pressure unchanged. Adopting the electronic expansion valve (accessory) guarantees a signifi cant increase in the EER. Ecological refrigerants The machines with direct expansion cooling system use the R-410A refrigerant, which does not damage the ozone layer.
Page 1 and 2: Serie R410A Close control air condi
Page 3 and 4: 2 an integrated system of treatment
Page 5 and 6: 4 Construction characteristics Plug
Page 7: 6 Plug fans with AC motors As an al
Page 11 and 12: 10 Refrigerant and oil charge OPA e
Page 13 and 14: 12 standard in order to protect the
Page 15 and 16: 14 “Free cooling” air-water: us
Page 17 and 18: 16 “Two sources” for the maximu
Page 19 and 20: 18 Accessories Numerous accessories
Page 21 and 22: AERMEC 20 Performance as the test c
Page 23 and 24: 22 Air cooled condensers to be matc

Air Conditioners Aermec PXO, PXU, PWO, PWU Data sheet

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