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All installations and services must be performed by qualified service personnel.
A. FLUE / CHIMNEY / VENT CONNECTOR
c CAUTION:
DO NOT install a manual damper in the chimney or vent connector.
Thermally- activated type vent dampers are NOT recommended for use on these furnaces.
It is desirable to install the shortest vent connector (also referred to as a flue or chimney connector)
possible with the fewest number of fittings, i.e. transitions and elbows. Generally, 6-inch diameter,
24 Ga. or heavier, single wall, lock seam-type, galvanized steel vent pipe and fittings are
satisfactory materials for the fabrication of a vent connector. However, always consult local codes
and authorities for specific minimum requirements.
For some installations, it may be prudent to turn the furnace flue elbow 90 degrees clockwise, with
respect to the front of the furnace, such that the elbow is open to the right-hand side of the unit,
rather than upward. Turning the flue elbow may better facilitate connection of the vent connector
piping to the flue elbow on the highboy and front flue, lowboy furnaces. Due to the presence of the
limit control and the wiring harness, the elbow may not be rotated 90 degrees counterclockwise.
The installer must carefully mark and cut a hole in the furnace housing to allow the vent connector
to pass through the housing.
If desired, with the furnace flue elbow turned to the right, the standard furnace top front panel (p/n
17346-2) may be replaced with the top front panel from the rear flue lowboy model (p/n 17383-2).
Refer to Appendix D: Replacement Parts for sketches of these parts. Contact your distributor to
purchase this part.
All horizontal sections of the vent connector must slope upward not less than ¼ inch per foot
from the furnace to the vent termination. Long horizontal sections of the venting system must be
supported at least every five (5) feet with metal straps to prevent sagging of the vent piping.
Secure all joints in the vent connector with sheet metal screws or equivalent fasteners. Vent
piping must not be inserted beyond the inside wall of the chimney flue.
B. DRAFT REGULATOR
A barometric-type, draft regulator is supplied with the furnace. Installation or operating
conditions that produce excess amounts of draft can reduce the heating efficiency of the furnace.
The purpose of the regulator is to adjust and control the flow of flue gases from the furnace by
stabilizing the amount of chimney draft to which the furnace is subjected.
Generally, install the barometric draft regulator in the vent connector as close as possible to the
flue outlet collar of the furnace. However, always refer to the draft regulator manufacturer's
installation instructions for application specific recommendations.
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