8 Daikin IM 972-1
Mechanical Installation
Ducting
The installing contractor should fabricate ductwork in
accordance with local codes. Use industry manuals as a guide
when sizing and designing the duct system. Contact Air
Conditioning Contractors of America, 1513 16th St. N.W.,
Washington, D.C. 20036.
Place the unit as close to the conditioned space as possible
allowing clearances as indicated. Run ducts as directly as
possible to supply and return outlets. Use of non-flammable
weatherproof flexible connectors on both supply and return
connections at unit to reduce noise transmission is
recommended.
On du
ctwork exposed to outside temperature and humidity, use
a minimum of 2" of insulation and a vapor barrier. Distribution
system in attic, furred space or crawl space should be insulated
with at least 2" of insulation. Half-inch to 1" thick insulation is
usually sufficient for ductwork inside the air conditioned space.
Provide balancing dampers for each branch duct in the supply
system. Properly support ductwork from the structure.
IMPORTANT: In the event that the return air ducts must be
run through an “unconfined” space containing other fuel
burning equipment, it is imperative that the user be informed
against future changes in construction which might change this
to a “confined space.” Also, caution the user against any future
installation of additional equipment (such as power
ventilators), within the existing unconfined and/or confined
space which might create a negative pressure within the
vicinity of other solid, liquid, or gas fueled units.
Return Air
DANGER
Never connect return ductwork to any other heat producing
device such as fireplace insert, stove, etc. Unauthorized use
of such devices may result in fire, carbon monoxide
poisoning, explosion, personal injury, property damage or
death.
DANGER
Never allow products of combustion or the flue products to
enter the return air ductwork, or the circulating air supply. All
return ductwork must be adequately sealed and secured to
the furnace with sheet metal screws and joints must be taped.
All other duct joints must be secured with approved
connections and sealed airtight.
Failure to prevent products of combustion from being
circulated into the living space can create potentially
hazardous conditions, including carbon monoxide poisoning
that could result in personal injury or death.
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