4
!
WARNING
IF UNIT IS TO BE INSTALLED WITHOUT AN INDOOR COIL, RETURN DUCT OR
PLENUM, IT MUST NOT BE IN STALLED DIRECTLY OVER COMBUSTIBLE MATE-
RIAL. IF INSTALLED WITHOUT AN INDOOR COIL WITH A RETURN DUCT OR
PLENUM, THE AIR PLENUM OR DUCT MUST HAVE A SOLID SHEET METAL
BOTTOM WITH NO RETURN AIR OPENINGS, REGISTERS OR FLEXIBLE AIR
DUCTS LOCATED DIRECTLY UNDER THE UNIT. EXPOSING COMBUSTIBLE
MATERIAL TO THE RETURN OPENING OF AN UPFLOW UNIT WITHOUT AN
INDOOR COIL CAN CAUSE A FIRE RESULTING IN PROPERTY DAMAGE, PER-
SONAL INJURY OR DEATH.
!
WARNING
THE RXBB-AA COMBUSTIBLE FLOOR BASE IS REQUIRED WHEN SOME
UNITS WITH ELECTRIC HEAT ARE APPLIED DOWNFLOW ON COMBUSTIBLE
FLOORING. FAILURE TO USE THE BASE CAN CAUSE A FIRE RESULTING IN
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. SEE CLEARANCES
FOR UNITS REQUIRING A COMBUSTIBLE FLOOR BASE.
!
WARNING
THE FIRST 36 INCHES OF SUPPLY AIR PLENUM AND DUCTWORK MUST BE
CONSTRUCTED OF SHEET METAL AS REQUIRED BY NFPA 90B. THE SUPPLY
AIR PLENUM OR DUCT MUST HAVE A SOLID SHEET METAL BOTTOM
DIRECTLY UNDER THE UNIT WITH NO OPENINGS, REGISTERS OR FLEXIBLE
AIR DUCTS LOCATED IN IT. IF FLEXIBLE SUPPLY AIR DUCTS ARE USED THEY
MAY BE LOCATED ONLY IN THE VERTICAL WALLS, OF A RECTANGULAR
PLENUM, A MINIMUM OF 6 INCHES FROM THE SOLID BOTTOM. METAL
PLENUM OR DUCT MAY BE CONNECTED TO THE COMBUSTIBLE FLOOR
BASE, IF NOT, IT MUST BE CONNECTED TO THE UNIT SUPPLY DUCT
FLANGES SUCH THAT COMBUSTIBLE FLOOR OR OTHER COMBUSTIBLE
MATERIAL IS NOT EXPOSED TO THE SUPPLY AIR OPENING FROM THE
DOWNFLOW UNIT. EXPOSING COMBUSTIBLE (NON-METAL) MATERIAL TO
THE SUPPLY OPENING OF A DOWNFLOW UNIT CAN CAUSE A FIRE RESULT-
ING IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
EXCEPTIONS TO DOWNFLOW WARNINGS:
• INSTALLATIONS ON CONCRETE FLOOR SLAB WITH SUPPLY AIR PLENUM
AND DUCTWORK COMPLETELY ENCASED IN NOT LESS THAN 2 INCHES OF
CONCRETE (SEE NFPA 90B).
• INSTALLATIONS OF UNITS WITHOUT ELECTRIC HEATERS.
!
WARNING
THE SUPPLY AIR PLENUM OR DUCT MUST HAVE A SOLID SHEET METAL
BOTTOM WITH NO SUPPLY AIR OPENINGS, REGISTERS OR FLEXIBLE AIR
DUCTS LOCATED IN IT FOR THE FIRST 36 INCHES OF HORIZONTAL SURFACE
ON UNITS WITH ELECTRIC HEATERS. FAILURE TO OBSERVE SUPPLY
PLENUM, DUCT WARNINGS CAN CAUSE A FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
!
WARNING
(SEE WARNINGS IN REGARD TO DUCTWORK)
DO NOT INSTALL THIS UNIT IN MANUFACTURED (MOBILE) HOMES.
IMPROPER INSTALLATION IS MORE LIKELY IN MANUFACTURED HOUSING
DUE TO DUCTWORK MATERIAL, SIZE, LOCATION, AND ARRANGEMENT.
INSTALLATIONS IN MANUFACTURED HOUSING CAN CAUSE A FIRE RESULT-
ING IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
EXCEPTION: MANUFACTURED HOUSING INSTALLATIONS ARE APPROVED
ONLY WITH DOCUMENTATION BY A RECOGNIZED INSPECTION AUTHORITY
THAT THE INSTALLATION HAS BEEN MADE IN COMPLIANCE WITH THE
INSTRUCTIONS AND ALL WARNINGS HAVE BEEN OBSERVED.
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