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
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/CSA B149.1 and
CAN/ CSA B149.2—latest editions and amendments.
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
To avoid the risk of electrical shock, wiring to
the unit must be polarized and grounded.
To avoid personal injury or death due to
electrical shock, disconnect electrical
power before servicing or changing any
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
To avoid the risk of injury, electrical shock
or death, the furnace must be electrically
grounded in accordance with local codes or
in their absence, with the latest edition of the
National Electric Code (NEC).
NOTE: 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 the 3 conditions exist which require additional
liner insulation, the installer may wish to consider installing
additional insulation 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.
The wiring harness is an integral part of this furnace. Field
alteration 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 wiring material having a temperature rating of at least 105°C.
Any replacement wiring must be a copper conductor.
115-Volt Line Connections
Before proceeding with electrical connections, ensure that the
supply voltage, frequency and phase correspond to that
specified on the unit rating plate. Power supply to the furnace
must be NEC Class 1, and must comply with all applicable
codes. The furnace must be electrically grounded in accordance
with local codes or, in their absence, with the latest edition of The
National Electric Code, ANSI NFPA 70 and/or The Canadian
Electric Code CSA C22.1.
Use a separate fused-branch electrical circuit containing properly
sized wire, and fuse or circuit breaker. The fuse or circuit breaker
must be sized in accordance with the maximum overcurrent
protection specified on the unit rating plate. An electrical
disconnect must be provided at the furnace location.
Connect hot, neutral and ground wires as shown in the wiring
diagram located on the unit's blower door.
Line polarity must be observed when making field connections.
Line voltage connections can be made through either the right or
left side panel. The furnace is shipped configured for a left side
(right side for counterflows) electrical connection with the
junction box located inside the burner compartment. To make
electrical connections through the opposite side of the furnace,
the junction box must be relocated to the other side of the burner
compartment prior to making electrical connections. To relocate
the junction box, follow the steps shown in "Junction Box
NOTE: Wire routing must not to interfere with circulator blower
operation, filter removal or routine maintenance.