Installation
Optional Piping Vestibule
If the unit was ordered with the vestibule, the NA (Non-
Access side) clearance dimension must be measured from
the vestibule.
Typical Unit with Piping
Vestibule and Factory-
Supplied Curb Kit
Ductwork Configurations
NOTE
Downblast Discharge Ductwork
- whenever
downblast discharge is used, the ductwork directly
beneath the unit must be connected with either a “T”
or an “L” configuration and the area directly beneath
the heat source must not have any openings such as
louvers or grates.
Rail Mounting and Layout
• The units may be installed on rails provided and
installed by others. Ensure that rails are designed to
handle the weight of the unit and provide proper load
distribution on building supports.
• Make sure that rail positioning does not interfere with
the openings on the unit.
• Rails should run the width of the unit and extend
beyond the unit a minimum of 12 inches on each side.
• Set unit on rails.
Typical Unit Installed on Rails Supplied by Others
No louvers or
grates
Summary of Contents for AR-DE12-05A
Page 75: ...Gas Supply In Typical Split Burner Manifold ...
Page 94: ...NOTE For HMA gas furnace for 311 and 352 chassis see separate IOM Manual ...
Page 96: ...HANDHELD KEYPAD DISPLAY OPTIONAL ...
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