Important Points Regarding Model Choice

Target Space and Volume of the Space

If a space larger than required is allocated, then the load on the air processor will be greater than expected, requiring a greater processing capacity. It may also result in fluctuations in temperature, humidity, and cleanliness, therefore it is recommended to keep the size of the space down to the minimum space required. Equipment and facilities located inside the target area will also take up considerable space and so this should also be taken into account.
Furthermore, while precision air processing in areas where the level of sealing is not very high is possible, there will be air flow losses and therefore it is recommended that such cases be discussed with us ahead of time.

Temperature and Humidity Settings

Regarding the target temperature-humidity setting conditions, if the control range is very tight (with respect to the control precision) then there are points which must be considered which may result in added costs in addition to issues such as effects of disturbances on the inside and outside of the target space, air processor control method, and stability. We recommend confining the space to one which will require the minimum temperature and humidity setting constraints.
In addition, the introduction of items into the surrounding space will also have a large impact on the temperature and humidity conditions inside the target space, and therefore, the conditions of the surrounding space must also be sufficiently considered.

Surrounding Conditions

Regarding the temperature and humidity conditions surrounding the target space, there may be a difference between a user's control values and actual values. If factory air processing capacity or insulation measures are not sufficiently put into place, then augmentation to the start of the line or increased production can lead to insufficiencies in air conditioning and heating power, which can result in higher than intended temperatures or over-cooling, and general fluctuations in the temperature and humidity inside the chamber. Cooling of the inside of the chamber during cold winter months can result in the inability of the air processor to function normally. Confirm minimum and maximum values throughout the year .
The surrounding temperature and humidity conditions can have a large effect upon the installation conditions inside the target area, and therefore this should be sufficiently confirmed ahead of time.

Cleanliness Class and Air Processing / How to Choose an Air Processing Method (Air Cooled vs. Water Cooled)

Depending on the refrigeration method, air processors can be broadly divided into two groups, air cooled and water cooled. Air cooling basically offers extremely easy installation, and a simple way to a high precision controlled air space. Water cooling is used in larger spaces that require greater cooling capacity. And since it less prone to effects of external disturbances, it is suitable when high precision is demanded. It offers clean controlled air without exhaust or heat output.

Air Cooled

A source of intake air used for cooling in the heat exchange process of the refrigeration cycle. Heat exchange occurs as an electric fan blows across coils that radiate heat. Cooling water piping for the heat exchanger is not required so installation is comparatively easier. (※ For models with built-in humidification units, water and compressed air piping for humidification is required.)

Water Cooled

Cooling water is used for heat exchange in the refrigeration cycle. Due to the fact that the rate of heat exchange is higher compared to cooling using outside air, and also do to the fact that it is more stable, these systems are able to accommodate low (1 m3/min) to high (120 m3/min) levels of air flow. In addition, the heat output from the fan motor is eliminated, and there is also no problem with dust being blown around from the fan. These systems are particularly suited in areas where high levels of cleanliness are demanded.


The ORION PAP Series operates with Heat Pump Balance Control, and in the case of water-cooled products, heating operation occurring under heat pump balance control means that as heat is taken up from from the cooling water (for the purpose of heating operation), the operation will also have the effect of further cooling the cooling water itself. Due caution should be taken when dedicated chillers for cooling water are installed on a 1 to 1 arrangement with regard to the air processors. And in case of cooling water supplied via a cooling tower, in particular in cold winter months, measures should be taken to ensure that the cooling water temperature does not fall down to 15 ℃ or lower by, as an example, using the water to cool other equipment first and then using it for the air processor as "secondary" cooling water