Inspecting high-efficiency furnaces

Heating · Condensing Furnaces · printed page 135 (PDF page 136)

Book index entries

Inspecting High Efficiency Furnace – Inspecting Inspecting High Efficiency Furnaces Condensing Gas Furnaces Furnace – Condensing Gas Furnace – Condensing

Text in the illustration

supply plenum
air flow
exhaust vent
heat exchanger
run the furnace long enough to ensure that the spillage switch doesn't activate and turn the furnace off
check the temperature rise and compare it to the recommended rise shown on the data plate (beyond Standards)
check the condensate tubing for dirt or soot on the inside walls
check for leakage or blockage of the condensate tubing
is a neutralizer required in your area? check for clogging
high efficiency gas furnace
make sure that the condensate is discharging to an appropriate location

Generated explanation

A cutaway schematic of a high-efficiency condensing gas furnace shows a lower circulating-air blower moving air upward past the heat exchangers into the supply plenum. A burner, serpentine heat exchanger, lower finned exchanger, induced-draft fan, and vertical exhaust vent illustrate the combustion-gas path. Thermometers at the lower air inlet and supply plenum indicate locations for checking temperature rise against the data plate. Condensate tubing leads from the furnace and vent area to a lower collection or treatment container and an outgoing drain line. Annotations identify inspection checks for spillage-switch shutdown, dirty or sooty condensate tubing, leakage, blockage, neutralizer requirements, and appropriate condensate discharge; no actual failure is explicitly shown.

Components

gas furnace burner heat exchangers circulating-air blower induced-draft fan supply plenum exhaust vent spillage switch condensate tubing condensate neutralizer condensate discharge line thermometers

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