Design Technical Manual

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PRECAUTION
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About fresh air intake kit
• The Fresh Air Intake Kit can be installed onto cassette type air conditioners.
• The volume of ventilated air provided by the Fresh Air Intake Kit may be unable to fulll ventilation
regulations in all countries.
On such occasions we ask that this kit be used along with Energy recovery ventilators.
• When in taking outside air, ensure correct air-conditioning design as based on air-conditioning
load calculations.
As outside air is not being processed an increase in outside air load can a󰀨ect air conditioning.
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Installation location
• Areas that generate corrosive gases such as sulfuric acid, chlorine gas and alkalis that will cause
copper pipes and brazed joints to corrode and could cause refrigerant leaks.
• Coastal areas with exposure to salt air. Salt air can cause corrosion leading to unit failure or
condensate leaks.
• Be certain to use electric dampers and shutters to avoid inltration of cold air, wind and fog
during shutdown in areas with cold climates, strong winds, or where fogs are common.
• Ensure the product is installed a distance of at least three times the duct diameter away from
exterior wall air inlets, or air exhausts for the prevention of short circuits.
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Temperature conditions
• Condensation may form on the product when outside air temperature is low, and the temperature
and humidity surrounding the product are high. Do not intake the air of below 32°F (0°
C)
into the
fresh air intake kit.
• The unit should not be operated above the max outdoor operating temperature.
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About duct fan
• When installing the duct fan, connect the drive relay (locally purchased) and operate with the
indoor unit.
• Ensure that outside air introduced into the unit is below 10% of the units “high” air volume.
Exceeding this limit could cause excessive noise temperature uctuations.
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About the duct connection
• Procure a duct with internal diameter that ts the external diameter of the duct ange.
• Note that regulations of some countries may require the use of a nonammable duct.
• If the duct penetrates a re-retarding division or other re-proong measures, the installation
of re dampers, or a construction that does not adversely a󰀨ect re control measures is a
regulatory requirement of some countries.
• When using metallic ducts, ensure metals (i.e., metal lath, wire lath, stainless sheeting) are
electrically insulated. (A short occurring by electrical connection can cause re)
• Ensure to thermally insulate connected ducts to prevent condensation.
• Make certain that netting or other measures are installed in parts exposed to the outside air to
prevent inltration of small animals such as birds and insects.
• Install lters on the outside air to protect the indoor unit heat exchanger.
• Avoid the inltration of rain water by installing outside ducts with an incline of at least 1/30, and
tting hoods on openings.
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