What is an induction system?
 An induction system is an air-water system that uses the energy conveyed by two fluid streams to achieve the required cooling or heating in a space.
 
The air is called the primary air and is a constant volume variable temperature air flow, supplied under pressure to the plenum of the induction terminal unit where it is discharged through a series of nozzles. An area or zone of low pressure is thus created inducing return air through the secondary water coil into a mixing chamber in front of this coil,. This is known as the secondary air stream.
 
The coil is supplied with chilled water at a temperature to offset the internal loads of the space. The flow is known as the secondary water flow, from the early designs when the water was taken from the leaving side of the primary air handler cooling coil, and was therefore secondary water. The water from the building refrigeration plant that supplied the primary air unit coil was, and is, referred to as the primary (chilled) water.
 
The systems are ideal for handling the constantly varying perimeter loads. With the ability for unit-by- unit control if needed, the induction unit remains a viable answer for control in offices and open spaces of the perimeter zones. The principle of the induction unit has now been extended into the internal zones, with savings in space requirements and energy usage.
 
What are the alternatives Dadanco can offer to owners/managers/consultants of commercial buildings with existing induction units and associated air conditioning systems?
Dadanco have two distinct upgrade paths. Choose either Dadanco Refurbishment or Dadanco Retrofit. For many clients, this choice is made after Dadanco have carried out tests on air flow and noise on the existing to determine which is the most economical path to follow.
 
Does Dadanco have something to suit the make and model of induction unit currently installed in the building?
 Yes. Dadanco has refurbishment and retrofit options for a wide range of existing induction units. The extent of refurbishment is best determined by tests on sample existing units at our Adelaide office. The written report provided on completion of the testing will describe what Dadanco recommend for your units.
 
What form of testing does Dadanco carry out on existing units?
 Arrangements are made for some site tests on, preferably, two units, which are then disconnected and sent to Adelaide. One unit is tested as is for air flow and noise, providing benchmark data. Using these test results, modifications are made to the second unit, incorporating Dadanco STARLINE nozzles and air side flow path enhancement. The modified unit is then put through the same tests. Alterations are carried out to obtain the best performance result. The two units are then returned to your building and re-installed.

	Smaller ducting reduces ceiling space requirements for services
	Reduced ceiling height results in reduced building height or more floors of lettable space for the same overall height
	Smaller risers for ducts, giving more lettable area.