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Top of Tempstar condensing gas furnace shows signs of reverse air flow (C) Roger Hankey at InspectApedia.comCondensing Gas Furnace Inspection
CO Gas Leak Test Procedures, DRAFT IN PROCESS

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Inspection & tests of a condensing gas furnace:

Visual inspection of a 1996 Tempstar™ condensing gas furnace discovers signs of "reverse air flow" at the condensing furnace air intake. This condition leads home inspector Roger Hankey to expand the inspection scope to test the heating system for safety.

Page top photo: initial inspection at the top of this Tempstar™ gas furnace shows discoloration at the combustion air intake, a possible sign of improper and unsafe system operation discussed below.



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Condensing Gas Furnace Inspection, Tests, & Carbon Monoxide CO Gas Hazards

Top of Tempstar condensing gas furnace shows signs of reverse air flow (C) Roger Hankey at InspectApedia.comFurnace inspection leads to recommended test

Roger Hankey

On a 20˚F day in December 2017 an initial tour of the house found a condensing gas furnace in the basement with a plastic vent pipe and no pipe on its air intake.

A plastic grid over the combustion air intake was discolored and cracked consistent with heat damage [photos above].

[Click to enlarge any image]

Also a very slight odor was found at the intake consistent with the odorant in natural gas.

Opening the front panel revealed corrosion consistent with condensate leak below the inducer but no active leak was found.

2018-01-15 This article is under draft & revision and will be re-posted here as soon as those notes are complete.

Meanwhile, see the procedures discussed at HEAT EXCHANGER LEAK TEST - Editor.

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Continue reading at HEAT EXCHANGER LEAK TEST - home, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see HEAT EXCHANGER LEAK ALLOWED

Or see HOW to INSPECT HEATING SYSTEMS

Or see TEMPSTAR HVAC MANUALS for the manual for the heating system discussed on this page

Or see these

Condensing Heater Inspection Articles

Furnace Heat Exchanger Articles

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