Instruction manual

14
Appliances which burn propane (sometimes referred to as LP (liq-
uefied petroleum)) gas are considered gas-fired appliances.
CHECK 3 - CHIMNEY CROWN CONDITION.
Damage from condensate usually shows up first in the crown. If
any of the following trouble signs are present, the condition of the
crown is not satisfactory:
a) Crown leaning
b) Bricks missing
c) Mortar missing
d) Tile liner cracked
e) No tile liner
f) Salt staining at mortar joints. (White stains, and mortar
becomes sandy and/or erodes.)
For problems a, b, or c, see Fix 3. If problems d, e, or f are present,
see Fix 4. IMPORTANT: It may be necessary to follow both Fix 3
and Fix 4.
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 refined (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
reline the chimney (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 con-
dition.
Remove the lowest existing vent connector, and examine the in-
side of the elbow or tee at the base of the liner. A small amount of
soot may be considered acceptable, provided the installer vacu-
ums 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. Vent-
ing 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 spi-
raled 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 metal liner is the correct size for the appli-
ances 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
reline the chimney (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 mini-
mum 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/CSA B149.1 and CAN/CSA B149.2 - 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 con-
nector 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/CSA B149.1 and CAN/CSA B149.2 -
latest editions and amendments, then the clay tile liner can prob-
ably be used as a vent for the gas appliances. However, the in-
staller 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/CSA B149.1 and CAN/CSA
B149.2 - latest editions and amendments assume interior
chimneys.)
If, in the judgment of the local gas utility, installer, and/or local codes;
one or more of the above factors is likely to present a problem, the
chimney must be relined (Fix 4).
FIX 1 - LINER TERMINATION.
Any cap or roof assembly used with a liner must be approved by
the liner manufacturer for such use. The liner and cap/roof assem-
bly must then terminate above the roof in accordance with the
manufacturer’s instructions.