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Fan coil Units (FCU)
A fan coil unit is a simple unit consisting of a heating and/or cooling coil and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings. Fan coil units circulate hot or cold water through a coil in order to condition a space. The unit is supplied hot or cold water from a central plant, or mechanical room.
Fan coil units are divided into two types: Two-pipe or four-pipe units. Two-pipe fan coil units have one (1) supply and one (1) return pipe. The supply pipe supplies either cold or hot water to the unit depending on the time of year. Four-pipe fan coil units have 2 stacked coils with two (2) supply pipes and two (2) return pipes. This allows heating or cooling to be available at the any given time .
Vertical fan coil
Majority of units in residential high rise buildings use this configuration. Located inside the wall they are easily identifiable by the large access panel where you may see service technicians open to clean the unit and change the filter throughout the year as part of a maintenance program.
Horizontal Fan coil
More often used in common areas or industrial builds. Mounted to the ceiling they are sometimes located in closets/laundry rooms or behind large access panels in the ceiling.
HRV ERV unit
Heat recovery ventilators (HRV) and energy recovery ventilators (ERV) are air exchange systems that help to enhance indoor air quality and minimize heating costs. They retain existing heat and optimize the interior moisture content in the air. These mechanical systems use fans to maintain a balanced airflow into the house while exhausting stale indoor air. HRV/ERV systems in Condominiums are tied in to your bathroom exhaust (more often then not)
In simpler terms a fan takes indoor air from your bathroom exhaust (some times other sources in home), passes it through a heat exchanging core then continues to exhaust outside. Another fan in the unit draws in fresh air from outside and passes through the core and into your home. The indoor air heats up the outdoor air in the winter and cools it in the summer.
What is the difference between an HRV and an ERV?
HRVs and ERVs are similar devices in that both supply air to the home and exhaust stale air while recovering energy from the exhaust air in the process. The primary difference between the two is that an HRV transfers heat while an ERV transfers both heat and moisture.