Amana GUI Installation Instructions Manual page 11
Gas fired warm air furnace
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Check 4 - Debris in Cleanout
A cleanout (dropleg) must be present such that the upper
edge of the cleanout cover is at least 12 inches below the
lower edge of the lowest chimney inlet opening.
A chimney without a cleanout could become partially
blocked by debris. If no cleanout is present, the chimney
must be relined. (Fix 4)
Remove the cleanout cover, and examine the cleanout
for debris. If significant amounts of any of the following
are found:
•
Fuel oil residue
•
Bricks
•
Mortar or sand
•
Pieces of the tile liner
•
Rusted pieces of the metallic liner
…then the chimney must be relined. (Fix 4)
Check 5 - Liner condition.
If a metal liner is present, it must be checked. It cannot
be assumed that all existing metal liners are correctly
installed and in good condition.
Remove the lowest existing vent connector, and examine
the inside of the elbow or tee at the base of the liner. A
small amount of soot may be considered acceptable,
provided the installer vacuums it away. If rusted pieces of
the liner have collected here, the metal liner must be
removed and replaced. (Fix 4)
Next, gently tap the inside of the liner with a phillips
screwdriver. If the screwdriver perforates the liner, or if
the tapping does not sound like metal hitting metal, the
liner must be removed and replaced. (Fix 4)
Remember that all appliances must be vented inside the
liner. Venting one appliance inside the liner and another
appliance outside the liner is not acceptable.
Next, use a flashlight and small mirror to sight up the liner.
B vent must be supported so as to not come into direct
contact with the chimney walls or tile liner. If it is not, it can
probably be rehung so as to be acceptable. A thimble or
fire stop may be helpful here.
Flexible liners should be hung straight or nearly straight.
If it is spiraled in the chimney and in good condition, it
should be rehung. To do this, break the top seal; pull up
and cut off the excess liner length, and refit the top seal.
Use caution when doing this, as the cut edges of flexible
liners may be sharp.
The surfaces of the liner must be physically sound. If
gaps or holes are present, the metal liner must be
removed and replaced. (Fix 4)
Finally, confirm that the metallic liner is the correct size
for the appliances to be installed. Use the GAMA tables
and rules.
If a metal liner is not present, a clay tile liner must be
present, or the chimney must be lined. (Fix 4)
Use a flashlight and small mirror at the cleanout or vent
connector to inspect the clay tile liner. If any of the
following problems are present:
•
Tile sections misaligned
•
Tile sections missing
•
Gaps between tile sections
•
Signs of condensate drainage at the cleanout or vent
connectors
•
Mortar protruding from between tile sections
•
Use of sewer pipe or drainage pipe rather than an
approved fire clay tile
…then the chimney must be relined. (Fix 4)
Next, measure the size of the liner. It may be possible to
do this from the cleanout. The liner must be at least as
large as the minimum size established by the tables in
National Fuel Gas Code, NFPA 54 / ANSI Z223.1 - latest
edition and in the National Standard of Canada, CAN/
CGA B149.1 and .2 - latest editions and amendments. If
the liner is too small or too large, then the chimney must
be relined. (Fix 4)
Check 6 - Dilution Air.
If gas-fired appliances are to be vented into a clay tile
liner, a source of dilution air is required.
Dilution air cannot be obtained through:
•
Induced draft appliances
•
Natural draft appliances with vent dampers
Sufficient dilution air can ordinarily be obtained through
the draft hood of a natural draft appliance only if the
appliance’s vent connector does not include a vent
damper.
If dilution air will not be available, the chimney must be
relined. (Fix 4)
Check 7 - Complete the Installation.
If Checks 1 through 6 have been satisfactory, and the
liner is an acceptable size as determined by the tables in
National Fuel Gas Code, NFPA 54 / ANSI Z223.1 - latest
edition and in the National Standard of Canada, CAN/
CGA B149.1 and .2 - latest editions and amendments,
then the clay tile liner can probably be used as a vent for
the gas appliances. However, the installer must keep in
mind the following factors which may render the tile liner
unsuitable for use as a vent:
•
Extremely cold weather
•
Long vent connectors
•
Masonry chimneys with no air gap between the liner
and the bricks. (In practice, this can be difficult to
detect.)
•
Exterior chimneys (The tables in National Fuel Gas
Code, NFPA 54 / ANSI Z223.1 - latest edition and in
the National Standard of Canada, CAN/CGA B149.1
and .2 - latest editions and amendments assume
interior chimneys.)
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