Split Air Conditioner (Ducted)
The book “Split A.C (Ducted)” is an important subject in the ITI Refrigeration and Air Conditioning (RAC) trade. It provides detailed knowledge about ducted split air conditioning systems, which are widely used for cooling large spaces such as offices, hotels, shopping malls, and commercial buildings. These systems offer centralized cooling with uniform air distribution through ducts.
Introduction to Ducted Split AC
A ducted split air conditioner is a type of split AC system in which the cooled air is distributed to different rooms or areas through a network of ducts. Unlike wall-mounted or cassette units, the indoor unit of a ducted system is usually concealed above a false ceiling, making it invisible and improving aesthetics.
These systems are designed to provide efficient cooling for large spaces and multiple rooms using a single indoor unit.
Main Components of Ducted Split AC
The ducted split AC system consists of the following components:
Indoor Unit (Air Handling Unit - AHU)
- Evaporator Coil: Absorbs heat from air
- Blower Fan: Circulates air through ducts
- Air Filter: Cleans incoming air
- Drain Tray: Collects condensate water
Outdoor Unit
- Compressor: Circulates refrigerant
- Condenser Coil: Releases heat
- Condenser Fan: Enhances heat rejection
Duct System
- Supply ducts for distributing cooled air
- Return ducts for recirculating air
- Diffusers and grills for air distribution
Working Principle
The working of a ducted split AC system is based on the vapor compression refrigeration cycle:
- The evaporator absorbs heat from return air.
- The compressor increases pressure and temperature of refrigerant.
- The condenser releases heat to outdoor air.
- The expansion device reduces pressure before refrigerant enters evaporator.
The cooled air is then distributed through ducts to different rooms.
Features of Ducted Split AC
- Centralized cooling system
- Hidden indoor unit for better aesthetics
- Uniform air distribution
- Suitable for large spaces
Advantages
- Cooling multiple rooms with one system
- Quiet operation
- Improved interior design (hidden unit)
- Better air distribution
Limitations
- Higher installation cost
- Requires duct design and space
- Maintenance can be complex
Installation of Ducted AC
Proper installation is essential for efficient operation:
- Design proper duct layout
- Ensure proper insulation of ducts
- Provide adequate support for indoor unit
- Ensure proper drainage system
Maintenance
Regular maintenance ensures efficient performance:
- Cleaning air filters and ducts
- Checking refrigerant level
- Inspecting electrical components
- Cleaning evaporator and condenser coils
Applications
Ducted split AC systems are widely used in:
- Hotels and restaurants
- Shopping malls
- Offices and conference halls
- Large residential buildings
Conclusion
The book “Split A.C (Ducted)” provides comprehensive knowledge about ducted air conditioning systems. These systems are essential for centralized cooling and are widely used in modern buildings.
Understanding their construction, working, and maintenance helps RAC technicians handle large-scale air conditioning systems efficiently. With proper design and installation, ducted split AC systems provide comfortable and energy-efficient cooling solutions.