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Installation precautions
• 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 ventila-
tion regulations in all countries. On such occasions we ask that this kit be used along with Ener-
gy recovery ventilators.
– When intaking outside air, ensure correct air conditioning design as based on air conditioning
load calculations. As outside air is not being processing an increase in outside air load can af-
fect air conditioning.
• Installation location
– Area that generated substances that adversely affect the equipment, such as sulfuric gas, chlo-
rine gas, add, or alkali it will cause the copper pipes and brazed joints to corrode, which can
cause refrigerant leakage.
– Area with high salt content, such as at the seaside. It will deteriorate metal parts, causing the
parts to fall or the unit to leak water.
– Be certain to use electric dampers and shutters to avoid infiltration of cold air, wind and fog dur-
ing shutdown in areas with cold climate, strong winds, or where fogs are common.
– Ensure the product in 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.
• 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 0 °C into the Fresh
air intake kit.
– Do not take fresh air at a temperature that exceeds the upper limit of the operation temperature
range of the outdoor unit.
• About duct fan
– When installing the duct fan, connect the drive relay (locally purchased) and operate with the
indoor unit.
– Ensure the intake air volume is below 10 % of the product’s air volume High. When the intake
air volume becomes too large there the operating noise may increase and room temperature de-
tection may be affected.
• About the duct connection
– Purchase 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 measure is a regulatory
requirement of some countries.
– When using metallic ducts, ensure metals (i.e., metal lath, wire lath, stainless sheeting) are elec-
trically insulated. (A short occurring by electrical connection can cause fire.)
– Ensure the 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.
– Be certain to install external air filters to parts exposed to the outside air for heat exchanger pro-
tection of indoor equipment.
– Avoid the infiltration of rain water by installing outside ducts with an incline of at least 1/30, and
fitting hoods on openings.
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10-3. Fresh air intake kit for cassette type (UTZ-VXRA) 10. Optional parts installation
SYSTEM
DESIGN
SYSTEM
DESIGN
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