Lennox SIGNATURE SLO185UFV Series Installation Instructions Manual Download

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Page 10

6 - After it has been determined that each appliance re

maining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other fuel burning appliance to its previous condi
tion of use.

7 - If improper venting is observed during any of the

above tests, the common venting system must be
corrected.

Flue Connections

IMPORTANT

When flue pipe is installed at less than minimum
clearance listed in table 2, radiation shields must be
installed. See figure 13.

Use 24 gauge or heavier galvanized smoke pipe and fit
tings to connect the furnace to the vent. Connect flue pipe
to chimney using the least number of elbows and angles
possible. Flue pipe or vent connector must be inserted into
but not beyond the inside surface of the chimney flue. No
reduction in diameter of flue pipe is acceptable. It is best to
have flue pipe as short and direct as possible. Where two
or more appliances vent into a common flue, the area of
the common flue should be at least equal to the area of the
largest flue or vent connector, plus 50% of the area of any
additional flues or vent connectors. Install a barometric
draft control (provided) and flue pipe according to instruc
tions packed with control.

Inspect flue pipe annually. Clean soot or ash from flue pipe,
if necessary. If pipe is rusted, replace.

Barometric Draft Control Installation

NOTE -

DO NOT install the barometric draft control if the

furnace is equipped with an air intake kit. See figure 9.

Install the provided barometric draft control in the flue pipe

at least 12 inches

beyond the furnace flue outlet to pro

vide space for flue gas sampling. The barometric draft con
trol may be installed in either vertical or horizontal sections
of the flue pipe; however, it should be positioned

no more

than 18”

beyond the furnace flue outlet. Follow the instruc

tions packed with the barometric draft control.

Alternate Side Flue Connections

The vent pipe may exit the top or sides of the cabinet. A
hole is provided in the top cap for top exit. For side exit, lo
cate the center hole punched in the side of the cabinet. See
unit dimensions on page 2. Using it as the center point,
cut a 6 inch (152 mm) round hole in the cabinet's side.

Install the barometric draft control within 18 inches of
the furnace flue outlet.

Attach the provided finishing

plate to cover rough edges.

Supply & Return Air Plenums

Secure return air plenum to unit using sheet metal screws.

NOTE - The following are suggested procedures that should
be followed when installing the supply air plenum.

1. Use sealing strips of fiberglass.
2. In all cases, the plenum should be secured to furnace or

evaporator cabinet with sheet metal screws.

3. Install supply and return air ducts as desired.

Oil Supply Line Sizing

Ensure that the restrictions of the piping system, plus any
lift involved, do not exceed the capability of the oil pump.
Use the following guidelines when determining whether to
use a single-or two-stage oil pump.

One-Pipe System

When using a one-pipe system (see figure 14), even with
the oil tank that is above the burner and a vacuum of 6”
(152 mm) Hg or less, a single-stage fuel pump with a sup
ply line and no return line should be adequate.

Manual bleeding of the fuel pump is required on initial start
up. Failure to bleed air from the oil pump could result in an
air lock/oil starvation condition.

NOTE - As an extra precaution, cycle heating on and off
ten times after bleeding air from the oil pump. This will
eliminate air in the gun assembly.

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