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CHECKLIST—DIRECT VENT (2-PIPE) INSTALLATION
LOAD CALCULATION
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Heating Load (Btuh)
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Cooling Load (Btuh)
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Furnace Model Selection
COMBUSTION AIR AND VENT PIPING
Termination Location
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Roof or Sidewall
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Termination Kit — 2 Pipe or Concentric
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Combustion-Air Pipe Length
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Combustion-Air Pipe Elbow Quantity
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Vent Pipe Length
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Vent Pipe Elbow Quantity
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Pipe Diameter Determined from Sizing Table
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Pipe Sloped To Furnace
Pipe Insulation
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Over Ceilings
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Low-Ambient Exposed Pipes
Condensate Drain
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Unit Level or Pitched Forward
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Internal Tubing Connections Free of Kinks
and Traps
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External Drain Connection Leak Tight and
Sloped
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Condensate Trap Primed before Start-Up
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Heat Tape Installed if Required
CHECKLIST—START-UP
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Gas Input Rate
(Set Within 2 percent of Rating Plate)
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Temperature Rise Adjusted
Thermostat Anticipator
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Anticipator Setting Adjusted or
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Cycle Rate (3 Cycles per Hr) Selected
Safety Controls Check Operation
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Primary Limit
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Pressure Switch
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