Fujitsu Airstage J-II Series Design & Technical Manual page 963

„ PRECAUTION
„
z 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 fulfill 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 affect air conditioning.
z 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 infiltration 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.
z 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.
z About duct fan
„
• When installing the duct fan, connect the drive relay
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 fluctuations.
z About the duct connection
„
• Procure a duct with internal diameter that fits the external diameter of the duct flange.
• Note that regulations of some countries may require the use of a nonflammable duct.
• If the duct penetrates a fire-retarding division or other fire-proofing measures, the installation
of fire dampers, or a construction that does not adversely affect fire 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 fire)
• 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 infiltration of small animals such as birds and insects.
• Install filters on the outside air to protect the indoor unit heat exchanger.
• Avoid the infiltration of rain water by installing outside ducts with an incline of at least 1/30, and
fitting hoods on openings.
(locally purchased) and operate with the
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