507276-03
Page 11 of 59
Issue 1621
Return Air Guidlines
Return air can be brought in through the bottom or either
side of the furnace installed in an upflow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation.
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on page 2.
Furnace applications which include side return air and a
condensate trap installed on the same side of the cabinet
(trap can be installed remotely within 5 ft.) require either a
return air base or field-fabricated transition to accommodate
an optional IAQ accessory taller than 14.5”. See Figure 14.
Figure 14
Side Return Air
(with Transition and Filter)
WARNING
Improper installation of the furnace can result in
personal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or air in the living space. Use sheet metal screws and
joint tape to seal return air system to furnace.
In platform installations with furnace return, the furnace
should be sealed airtight to the return air plenum. A
door must never be used as a portion of the return air
duct system. The base must provide a stable support
and an airtight seal to the furnace. Allow absolutely no
sagging, cracks, gaps, etc.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices such
as a fireplace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
Figure 13
Installation Clearances
Top
Bottom (Floor)
Left Side
Right Side
Top/Plenum
1 in. (25 mm)
*Front
0
Back
0
Sides
0
†
Vent
0
Floor
0
‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†
Allow proper clearances to accommodate condensate trap.
‡
For installations on a combustible floor, do not install the furnace directly
on carpeting, tile or other combustible materials other than wood
flooring.
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Страница 3: ...507276 03 Page 3 of 59 Issue 1621 EXPANDED VIEW Figure 1 ...
Страница 22: ...507276 03 Page 22 of 59 Issue 1621 Figure 25 Figure 26 ...
Страница 28: ...507276 03 Page 28 of 59 Issue 1621 Figure 34 ...
Страница 38: ...507276 03 Page 38 of 59 Issue 1621 Figure 57 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Страница 40: ...507276 03 Page 40 of 59 Issue 1621 Figure 59 Figure 60 ...
Страница 44: ...507276 03 Page 44 of 59 Issue 1621 TYPICAL WIRING DIAGRAM Figure 65 ...
Страница 57: ...507276 03 Page 57 of 59 Issue 1621 Start Up Performance Check List ...