Goodman Amana AMH8 Service Instructions Manual page 29

PRODUCT DESIGN
Fix 4 - Relining.
Relining options include B vent and flexible liners.
If the chimney has diagonal offsets, B vent probably can-
not be used.
If B vent is to be used, it must be supported adequately.
Supports (such as fire stops or thimbles) must be used
to prevent the B vent from coming into direct contact
with the tile liner or chimney walls. Direct contact would
result in higher heat loss, with an increased possibility
of poor venting system performance.
It is not acceptable to vent one appliance inside the B
vent and other appliances outside. The excess space
between the B vent and the chimney walls must be cov-
ered at the top of the chimney by a weatherproof, cor-
rosion resistant flashing.
The B vent should then be topped with a listed vent cap.
The listed vent cap will, when installed per the
manufacturer's instructions, prevent problems due to
rain, birds, or wind effects.
A B vent installed as described in this section is consid-
ered to be an enclosed vent system, and the sizing 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 CAN/CGA B149.2 - latest editions and
amendments may be used.
If a flexible liner is to be used, it must be made of the
proper materials:
• For most residential applications, an aluminum
liner should be acceptable.
• If the combustion air supplied to the furnace will
be contaminated with compounds containing chlo-
rine or fluorine, a liner of AL29-4C stainless steel
should be used. Common sources of chlorine and
fluorine compounds include indoor swimming pools
and chlorine bleaches, paint strippers, adhesives,
paints, varnishes, sealers, waxes (which are not
yet dried) and solvents used during construction
and remodeling. Various commercial and industrial
processes may also be sources of chlorine/fluo-
rine compounds.
• Heavier gauge 300 and 400 series stainless steel
liners were developed for use with oil or solid fuel
appliances. They are not suitable for use with gas-
fired appliances. Flexible liners specifically in-
tended and tested for gas applications are listed
in the UL "Gas and Oil Equipment Directory". (UL
Standard 1777).
For sizing of flexible liners, see Note 22 and the tables
in the National Fuel Gas Code NFPA 54/ANSI Z223.1 -
latest edition and in the National Standard of Canada,
CAN/CGA B149.1 and CAN/CGA B149.2 - latest editions
and amendments.
To install the liner, read and follow the liner
manufacturer's instructions and your local codes. Ex-
cess liner length should be pulled out of the chimney
and cut off. Use caution when doing this, as the cut
edges of flexible liners may be sharp. Do not spiral ex-
cess liner inside of the chimney. Support the liner as
recommended by the liner manufacturer.
Some manufacturers of flexible liners offer an insula-
tion sleeve designed to be added to the liner before it is
installed in the chimney. (Poured insulation, either ver-
miculite or other materials, is no longer recommended.)
Insulation will need to be added to the flexible liner if:
• It is required by the liner manufacturer's instruc-
tions.
• The previous liner was properly sized and installed,
and suffered from condensation damage.
• It is required by your local building codes.
Even if none of those three conditions exist which re-
quire additional liner insulation, the installer may wish
to consider it if:
• The local climate is very cold.
• The chimney is very tall.
• The vent connectors used are very long or have a
large number of elbows.
• Local experience indicates that flexible liners in-
stalled without insulation are likely to have con-
densation problems.
Insulation must be selected and installed in accordance
with the liner manufacturer's instructions.
Finally, cap the chimney and terminate the liner in ac-
cordance with the liner manufacturer's instructions.
Horizontal Applications and Considerations
Horizontal applications, in particular, may dictate many
of the installation's specifics such as airflow direction,
ductwork connections, and flue pipe connections.
Alternate Electrical and Gas Line Connections
Furnaces have provisions allowing for electrical and gas
line connections through either side panel. In horizontal
applications the connections can be made either through
the "top" or "bottom" of the furnace.
Propane Gas and/or High Altitude Installations
P
OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF
THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION.
CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE
AGENCY.
WARNING
T
HE APPROPRIATE KITS
A
LL
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