For some time now I have been advocating for an indoor single phase VRF (variable refrigerant flow) split system with a horizontal discharge condensing unit for window, through the wall and/or louver applications. Even though VRF systems have the capability for long refrigerant piping runs for outdoor roof or areaway space, sometimes that space is just not available to designers and contractors. Many condo or coop boards will not allow multi-dwelling building unit owners to put there equipment in common areas like roofs or courtyards. Inevitably, many are forced into using thru-the-wall condensing units in order to have central air conditioning in their residences. As a result, the highest efficiency alternative, VRF, is not a consideration because a through wall system was not available. Consequently, condo owners and smaller commercial tenants would have to settle for a 12 SEER thru-the-wall condensing unit instead of a 18+ SEER VRF alternative with variable speed compressor for additional partial load efficiency.
LG has answered the call for a single phase through wall option with its new Multi V Space hi-rise VRF solution. This 4.4 ton unit has a front condenser air inlet and outlet that sits flush against an exterior louver. It is designed to operate in turbulent wind conditions, which is often the case in hi-rise buildings in urban settings like Manhattan, San Francisco or Chicago. Condenser air discharge airflow is adjustable in three directions to prevent condenser air short cycling. Service and control access is all through a single interior panel located within the space. Refrigerant piping is flexible with connections at the rear or either side. Unlike the larger commercial 3 phase units, no condenser air discharge ductwork is required indoors. An optional automatic louver can open and close with system interlock to prevent draft in off cycles. The unit is quiet with projected sound power ratings at or below 55 dB(A). At only around 19″ deep, the unit footprint will mean very little floor area loss in an apartment or office.
Although the Multi V Space has been announced in the US, it is only currently available for purchase in Europe and Asia, but will be available in the US market shortly. Click here for a link to preliminary PDF literature on the equipment. This unit can be paired with any of LG’s indoor evaporators, both ducted and ductless, just like its standard outdoor heat pump counterpart. The flexibility of the system should open up a world of options for HVAC design and layout in multi-tenant urban environments where exterior HVAC equipment space is not an alternative. It will be interesting to see if competitors develop a similar alternative once the Multi V Space hits the market. More on this product as it becomes available.
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