Amana GUI Installation Instructions Manual page 12

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 assembly must then terminate above
the roof in accordance with the manufacturer's instruc-
tions.
In some cases, a shorter extension above the roof may
be possible with a liner than would be required with a
masonry chimney.
For further information on relining, see Fix 4.
Fix 2 -Change venting arrangements
If the masonry chimney has more than one channel, it
may be possible to vent the gas appliances into one
channel and vent the solid or liquid fuel appliance(s) into
another channel(s). Do not vent an Air Command 80
inside of a metal liner with other appliances vented
outside the liner.
Alternatively, the homeowner may agree to discontinue
use of the fireplace (solid fuel appliance). If so, the tile
liner must be cleaned to remove creosote buildup. The
fireplace opening must then be permanently sealed.
If oil-fired appliance(s) are being replaced by gas-fired
appliance(s), the tile liner must first be cleaned to remove
the fuel oil residue.
If none of the above options is practical, the Air Com-
mand 80 may need to be vented vertically with a B Vent.
Under some conditions an Air Command 90 or 95 could
be installed rather than an Air Command 80. The Air
Command 90 or 95 can be vented horizontally or verti-
cally through PVC pipe.
Fix 3 - Rebuild the crown.
If the chimney crown is damaged, a qualified mason
must repair it in accordance with nationally recognized
building codes or standards. One such standard which
may be referenced is the Standard for Chimneys, Fire-
places, Vents, and Solid Fuel Burning Appliances, ANSI/
NFPA 211.
Fix 4 - Relining.
Relining options include B vent and flexible liners.
If the chimney has diagonal offsets, B vent probably
cannot 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 be-
tween the B vent and the chimney walls must be covered
at the top of the chimney by a weatherproof, corrosion
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.
B vent installed as described above is considered to be
an enclosed vent system, and the sizing tables in Na-
tional 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
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 chlorine or
fluorine, a liner of AL294C stainless steel should be
used. Common sources of chlorine and fluorine
compounds include indoor swimming pools and chlo-
rine bleaches, paint strippers, adhesives, paints,
varnishes, sealers, waxes (which are not yet dried)
and solvents used during construction and remodel-
ing. Various commercial and industrial processes
may also be sources of chlorine/fluorine 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 intended
and tested for gas applications are listed in the UL
"Gas and Oil Equipment Directory". (UL Standard
1777).
12