Information purpose

1. Air Conditioning
& HVAC Systems

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Introduction
Air conditioning is the process of altering the properties of
air to more favourable conditions.The control of these
conditions may be desirable to maintain the health and
comfort of the occupants.
Ventilation is the process of changing or replacing air in any
space to control temperature or remove any combination of
moisture, odours, smoke, heat, dust, airborne bacteria, or
carbon dioxide, and to replenish oxygen.

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TYPICAL ALL-AIR SYSTEM

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TYPICAL ALL-AIR SYSTEM
LEGENDS
RA – RETURN AIR
SA – SUPPLY AIR
OA – OUSIDE AIR
EA – EXHAUST AIR

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TYPICAL ALL-AIR SYSTEM

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• The main components of this system are
the same as
direct expansion system but a chiller is the
additional
item. The system has the following
components….
• Compressor
• Condenser
• Chillers
• Air handling unit with chilled water coil
and/or fan
coil unit or chilled water air washers.
• Cooling tower;
• Chilled water and condenser water
pumps sets;
• Air distribution ducting and grills
AIR CONDITIONING SYSTEM (Direct Expansion System)

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TYPE OF AIR CONDITIONING
1) Window air-conditioning system
2) Split air-conditioning system
3) Central air-conditioning system
4) Package air-conditioning system
Window air-conditioning system
Split air-conditioning system

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VENTILATION
Ventilation includes both the exchange of air with the outside as well as
circulation of air within the building.
Methods for ventilating a building maybe divided into
1. mechanical /forced
2. natural types.

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Applications:
Homes
Restaurants
Industry
Offices
College or University
T
elephone exchanges
Auditoriums
Reception's areas

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Critical Inspection Involved
1) Window & Split AC – Functional testing, System Interlocks check,
Dimension, Visual, Painting
2) Package Air Conditioner - Functional testing, System Interlocks check,
Dimension, Visual, Painting
3) Centrifugal Fans / Blowers with Motors – Performance Testing,
Mechanical Run Test, Dynamic balancing, Dimension, Visual, Painting.
4) Diffusers, Louvers – Dimension, Visual
5) Ducts & Dampers – Dimension, Visual
6) Insulation & Cladding – Verification of Properties, Visual.

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