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1.0 INTRODUCTION
This high effi cient gas fi red two stage condensing furnace is an upfl ow only, warm air furnace suitable for
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residential and light commercial heating applications with inputs 40,000 to 120,000 Btu/hr.
This high effi cient furnace series is CSA certifi ed as a Category IV indirect or direct vent central forced air
furnace. When installed as a direct vent furnace, all combustion air is supplied to the furnace burners through the
air intake system. (See Section 7, "Ventilation and Combustion Piping.")
All models may be fi red by natural or LP gas (propane), and may be fi eld converted from natural gas to LP gas
using Conversion Kit W370-0018.
The furnace is shipped completely assembled except for the condensate drain trap assembly. Please inspect
for damage when the furnace is unpacked.
2.0 SAFETY SYMBOLS AND WARNINGS
Understand and pay particular attention to the words DANGER, WARNING, and CAUTION and the following
defi ned symbols are used throughout this manual to notify the reader of potential hazards of varying risk levels.
INDICATES AN IMMINENTLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, WILL
INDICATES A POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED,
INDICATES A POTENTIAL HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, MAY
RESULT IN MINOR OR MODERATE INJURY. IT MAY ALSO BE USED TO ALERT
IMPORTANT:
READ THE FOLLOWING INSTRUCTIONS COMPLETELY BEFORE INSTALLING!
W415-2306 / C / 09.22.20
DANGER
!
RESULT IN DEATH OR SERIOUS INJURY.
WARNING
!
COULD RESULT IN DEATH OR SERIOUS INJURY.
CAUTION
!
AGAINST UNSAFE PRACTICES.
H4.0.9A
!
!
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H3.3.1
H6.0
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