Design and Technical Manual

6. SYSTEM DESIGN
PRECAUTION

About fresh air intake kit
z
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 intaking outside air please 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.
Installation location
z
Area that generate substances that adversely affect the equipment, such as sulfuric •
gas,chlorine gas,add,or alkalli it will cause the copper pipes and brazed joints to corrode,whitch
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 inltration of cold air, wind and fog •
during shutdown in areas with cold climates, strong winds, or where fogs are common.
Please 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.
Temperature conditions
z
Condensation may form on the product when outside air temperature is low, and the temperature •
and humidity surrounding the product are high. Don't intake the air of below 32°F (0°
C)
into the
Fresh air intake kit.
The upper Iimit of the product's temperature range should respond to the outdoor temperature •
range.
About duct fan
z
When installing the duct fan, connect the drive relay ( • eld supplied) and operate with the indoor
unit.
Please ensure the intake air volume is below 10% of the product’s air volume HI. When •
the intaken air volume becomes too large there the operating noise may increase and room
temperature detection may be affected.
About the duct connection
z
Procure a duct with internal diameter that ts the external diameter of the duct ange. •
Please 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 affect re control measures is a
regulatory requirement of some countries.
When using metallic ducts please ensure metals (i.e., metal lath, wire lath, stainless sheeting) are •
electrically insulated. (A short occurring by electrical connection can cause re)
Please ensure to thermally insulate connected ducts to prevent condensation. •
Please 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.
Please be certain to install external air lters to parts exposed to the outside air for heat •
exchanger protection of indoor equipment.
Please avoid the inltration of rain water by installing outside ducts with an incline of at least 1/30, •
and tting hoods on openings.
- (06 - 131) -
SYSTEM DESIGN SYSTEM DESIGN