GMES8 GCES8 Installation Instructions
15
• It is required by your local building codes.
Even if none of those three conditions exist which require addi-
tional 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 installed
without insulation are likely to have condensation
problems.
Insulation must be selected and installed in accordance with the
liner manufacturer ’s instructions.
Finally, cap the chimney and terminate the liner in accordance
with the liner manufacturer’s instructions.
E
LECTRICAL
C
ONNECTIONS
HIGH VOLTAGE !
T
O
AVOID
THE
RISK
OF
ELECTRICAL
SHOCK
,
W IRING
TO
THE
UNIT
M UST
BE
POLARIZED
AND
GROUNDED
.
WARNING
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POW ER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
W IRING
.
WARNING
L
ABEL
ALL
W IRES
PRIOR
TO
DISCONNECTION
W HEN
SERVICING
CON TROLS
. W
IRING
ERRORS
CAN
CAUSE
IM PROPER
AND
DANGEROUS
OPERATION
. V
ERIFY
PROPER
OPERATION
AFTER
SERVICING
.
CAUTION
HIGH VOLTAGE !
T
O
AVOID
THE
RISK
OF
INJURY
,
ELECTRICAL
SHOCK
OR
DEATH
,
THE
FURNACE
M UST
BE
ELECTRICALLY
GROUNDED
IN
ACCORDANCE
W ITH
LOCAL
CODES
OR
IN
THEIR
ABSENCE
,
W ITH
THE
LATEST
EDITION
OF
THE
N
ATIONAL
E
LECTRIC
C
ODE
.
WARNING
W IRING HARNESS
The wiring harness is an integral part of this furnace. Field alter-
ation to comply with electrical codes should not be required. Wires
are color coded for identification purposes. Refer to the wiring
diagram for wire routings. If any of the original wire as supplied
with the furnace must be replaced, it must be replaced with wir-
ing material having a temperature rating of at least 105° C. Any
replacement wiring must be a copper conductor.
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 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.
A B-vent installed as described in this section is considered 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/ CSA B149.1 and CAN/ CSA 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 chlorine or
fluorine, a liner of AL 29-4C 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/ 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).
For sizing of flexible liners, see the tables in the 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.
To install the liner, read and follow the liner manufacturer’s in-
structions and your local codes. Excess 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
excess liner inside of the chimney. Support the liner as recom-
mended by the liner manufacturer.
Some manufacturers of flexible liners offer an insulation sleeve
designed to be added to the liner before it is installed in the chim-
ney. (Poured insulation, either vermiculite 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 instructions.
• The previous liner was properly sized and installed, and
suffered from condensation damage.