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•
Unsuitable heating system water can cause
the formation of scale or sludge, which
affects system efficiency. It can also cause
corrosion and reduce life of the heat
exchanger.
•
Never use water that has been treated by a
reverse osmosis, deionized, or distilled
water to soften the water to fill the heating
system.
IMPORTANT
Replacement of components due to water
quality damage is not covered by the warranty.
Non-Ducted Return Closet Installation
• Clearances to combustible material is 0 in.
from unit casing, and 0 in. to plenum and
duct for first 36 in. (914 mm) and throughout
the remaining ductwork system.
• Clearance for servicing is 24 in. (610 mm) in
front of air handler.
FRONT
0 in.
SERVICING
24 in.
(610 mm)
BOTTOM
0 in.
Images are not to scale and are for illustration purposes
only. Images do not show a complete system with
plenums, duct pipes, etc.
Hydronic Air Handler Installation and Operation Manual
TOP
0 in.
SIDE
BACK
0 in.
0 in.
• Louvers or return air grilles are field-supplied.
Local codes may limit application of systems
without a ducted return to single-story
buildings.
• For a unit installed in a closet with a louvered
return opening, the minimum open area for
the louvers are:
Air Handler Models
• AH083P/AH083CP
• AH084P/AH084CP
• AH125P/AH125CP
• AH166P/AH166CP
• AH206P/AH206CP
• If the free area is not known, assume a 25%
free area for wood or a 75% free area for metal
louvers or grilles. Using the louver dimensions
and the 25% or 75% assumption, determine if
the louver open area meets the minimum open
area listed above.
• If the return air plenum is used, the return air
grille should be immediately in front of the
opening in the plenum to allow for the free flow
of return air.
• When not installed in front of the opening, there
must be adequate clearance around the air
handler to allow for the free flow of return air.
Clearances to
combustible
material is 0 in. to
plenum and duct for
first 36 in. (914 mm)
and throughout the
remaining ductwork
system.
Minimum Opening Area
320 square inches
(0.206 square meters)
360 square inches
(0.23 square meters)
450 square inches
(0.29 square meters)
19
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