Table of Contents
Advertisement
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 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 in-
structions, 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 in the
latest edition of the National Fuel Gas Code NFPA 54/ANSI
Z223.1.
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 latest edition
of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
To install the liner, read and follow the liner manufacturer's
instructions 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 recommended 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 chimney. (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.
•
It is required by your local building codes.
Even if none of those three conditions exist which require ad-
ditional 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.
Electrical Connections
HIGH VOLTAGE !
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
,
ELECTRICAL SHOCK
DISCONNECT ELECTRICAL POWER
BEFORE SERVICING OR CHANGING ANY ELECTRICAL
.
WIRING
L
ABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING
. W
CONTROLS
IRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS
. V
OPERATION
ERIFY PROPER OPERATION AFTER SERVICING
HIGH VOLTAGE !
T
O AVOID THE RISK OF INJURY
,
DEATH
THE FURNACE MUST BE ELECTRICALLY
POLARIZED AND GROUNDED IN ACCORDANCE WITH
LOCAL CODES OR IN THEIR ABSENCE
N
EDITION OF THE
ATIONAL
Wiring Harness
The wiring harness is an integral part of this furnace. Field
alteration to comply with electrical codes should not be re-
quired. 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 wiring material having a temperature
rating of at least 105°C. Any replacement wiring must be a
copper conductor.
14
WARNING
CAUTION
.
WARNING
,
ELECTRICAL SHOCK OR
,
WITH THE LATEST
E
C
.
LECTRIC
ODE
Advertisement
Table of Contents
Troubleshooting
