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Air Conditioning Products

AHU System

The definition of air handling unit from ANSI/AHRI Standard 430-2009 states that it is "A factory-made encased assembly consisting of a fan or fans and other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air...."

The AHU is used to control the following parameters of the space.

  • Temperature
  • Humidity
  • Air Movement
  • Air Cleanliness
  • There are basically two types of air handling unit that are in used and they are the "Draw-Through" or "Blow-Through".
  • In the Draw-Through type, the fan pulls the air through the mixing box, filters and cooling coil before discharging it from the fan outlet to the space to be conditioned or to the ducting network. The design can be vertical or horizontal. In this case, the section before the fan has negative pressure.
  • In the Blow-Through type, the fan blows the air through the mixing box, filters and cooling coil before discharging them to the space being conditioned or the ducting system. In this case, the section after the fan has positive pressure.

Package Unit

Package air conditioner is a bigger version of the window air conditioner. However, unlike window air conditioner or PTAC units, it has a higher cooling or heating capacity and is usually able to cool an entire house or a commercial building. The nominal capacities ranges from 3 tonne to 15 tonne.

The conditioned air are transferred to the space to be conditioned through ducting which is usually hidden in the ceiling and wall of the building. The unit is placed outside the house, a special room in a building or even on top of a roof. This unit is factory assembled and skilled technicians are needed to install this type of unit.

Protection devices such as High/Low pressure switch, overload relays for all motors, water flow and air flow switches are included in the units. The compressor have winding protection thermostat built into the winding to disconnect the circuit in the event of overheating.

There is an interlocking circuit with the evaporator fan motor starter to ensure that the compressor can only start if the fan motor is running. 

Two Refrigeration Systems

In some units, two independent refrigeration systems are included in the package. In this case, the cooling coils have a common tube sheets though the two systems are independent. The tubes of the coil are entwined.

Two separate water-cooled condensers or a condenser with an internal partition that forms two independent condensers are used. The water side is common to both the independent condenser portions.

It is a common practice to have one compressor running all the time with the other compressor control by a single-stage thermostat. In this case, the capacity can be controlled either to 50% or 100%. However, newer units have two-stage thermostat that can control the capacity from 0%, 50% or 100%.



Roof Top

Rooftop air conditioner is a self-contained unit which is usually installed on the rooftop of a commercial building. The type of unit can be for cooling only, heating only or a combination of both. Departmental stores, cinemas and supermarkets are ideal buildings for this type of air conditioning. Installing this unit is economical because it is already factory tested and assembled by the time it arrived at the site.

As these units are installed outdoor, they must be designed to withstand tough conditions such as strong gust of winds, rain and direct sunlight. Paint coating used is of suitable grade to withstand these harsh weather conditions.

The doors will usually have designed that are able to withstand the wind conditions as well as water from seeping into the housing assemble. When installing, make sure that the rooftop is strong enough to take the weight of the unit.

Maintenance of Rooftop Air Conditioner

As the rooftop units are usually located on the roof of a building, various precautions have to be taken to ensure that your safety is of utmost importance when doing maintenance or trouble shooting the units. Here are some of them.

  • When the weather is hot with direct sunlight, use gloves when handling heated panels. Panels are usually made of metal and they will be hot when heated under the sun. Get a hat and sun glasses to reduce the loss of fluid from your body due to the heat. Always have a bottle of water to replenish your body fluid after working for a period of time.
  • Under strong wind condition, always ensure that the doors of the panel are securely opened. This is to prevent the wind from swinging the panels which may cause injury to the personnel more so if the personnel is here for the first time. If the wind is strong, consider setting up wind shelter. Safety belts which are securely hooked to the solid part of the units should be used when necessary.


AHU System




Roof Top

VRF System