Below are some schematics of all the main components of a ducted air conditioner and below that, a description of each with a brief explanation of its function.


In very simple terms, this is how Ducted Airconditioning works:

  1. The Outdoor Unit. Houses the compressor, evaporative coils/heat exchanger, and electronic boards or ‘brains’ of the system. Unlike most other systems, it has vertical air discharge which keeps surrounding air temperature around the unit to a minimum ensuring maximum efficiency. Ideal for installations close to boundary fences.
    Hot Gas (which is hot because it has drawn the heat from the indoor air) is pumped from the indoor unit to this outdoor unit where cooler ambient air is blown over the fan coil fins which cools the gas down. The compressor now recompresses the gas, and pumps it back indoors.
  2. Indoor Fan Unit. Compressed gas evaporates in the tubing of the indoor fan coil. Evaporation is a cooling process which cools the fins down. Warm indoor air (recirculated back from the rooms) is blown over the fins which cool the air down – is then blown to each room through the insulated ducting. There is a drip tray at the bottom of the unit which catches condensate accumulating on the cold metal parts which then drains to the outside.
  3. Plenum. A metal component fitted to the fan unit with a number of attachments for ducting to be connected. This ducting is usually a string which branches off to different rooms/zones and different ceiling outlets/diffusers.
  4. Purtech Return Air Grille & Filter. Once air is blown into a zone/room, it needs to recirculate back to the indoor unit in the ceiling to be cooled down again and it does this through the return air grille – being filtered at the same time. The 3-layer filter also has electrostatic properties to remove ultrafine particles.
  5. Drip Tray (with old style drain) channels condensate to the outside. The new style S-drain is a great improvement on ensuring the drain stays open and is properly cleaned during servicing and lasts.
  6. Branch Takeoff. An insulated branch-off section which splits the main duct into 2 or 3 smaller ducts going to each room/outlet.
  7. Zone Motor / Damper. Controls the volume of air going down that duct, which in turn controls the temperature of that room. More cold air into a room means it will eventually get colder.
  8. Flexible Duct. This duct has an R1 thermal rating with a smooth inner surface to minimize noise and maximize air flow. The inner core has an encased spring steel coil which prevents it from collapsing or getting squashed. The polyester insulation layer will not support bacterial or fungal growth and does not contain harmful glass fibers.
  9. Stylish Round Ceiling Diffuser. Diffusers to choose from are Elegant Round, Square Multidirectional, Square Silhouette, Circular Heritage, Round Jet & Bar Grille.
  10. Master Wall Controller. Switches zones on/off, fan speed low to high, temperature up/down.
  11. Mobile App – ActronConnect (Optional Extra Controller). Will control most new Actron systems from anywhere in the world. (On/Off, fan speed, room temperatures.)
  12. Individual Zone/room controller (For ACTRON ESP Ultima & ESP Platinum Ultima – on/off & temp. up/down). Has a temperature sensor which gives feedback to the system to increase or decrease airflow automatically to ensure the temperature is maintained exactly.