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035-16328-002Rev. C (0902)
ROOF JACK
AWARNING
Failure to follow aft venting instructions can result
in fire, asphyxiation, or explosion.
[AkCAUTION
Only use the appropriate roof jack. See Figures 6
& 7 for correct application.
Do not exceed the maximum height as deter-
mined from Figures 6 & 7. Installer should allow
an additional 1-1/2" travel before the flue pipe
assembly is fully extended against the built-in
stop. This provides an additional safeguard
against the flue assembly being pulled from the
roof jack during transportation or other stress
conditions.
EXISTING FURNACE REPLACEMENT
Ifthis furnace replaces an existing furnace, do the following:
f. If a 2nd roof, roof cop or addition has been made to the
existing roof of the home, remove the old roof jack com-
pletely! To avoid the possibility of an impropedy installed
pipe or gaps in the old roof jack, INSTALL A NEW ROOF
JACK. Your ceiling and roof height will determine the cor-
rect roof jack to use. Refer to the vent selection table, of
the furnace installation instructions.
2. After unpackingthe roof jack, check the rain caps. Insure
they are not damaged, tilted or crooked. Do not twist,
crush or sit on the roof cape during installation. Damaged
roof cape will cause improper furnace operation. The fur-
nace will not heat properly and could result in explosion.
3. Before inserting the roof jack into the furnace top,
inspect the furnace flue and combustion air opening for
debris or insulation which might have fallen in during pre-
installation steps. Do not proceed unless all debris has
been cleaned out or removed.
4. After installing roof jack on furnace top collar, check to
make sure there is no gap in back or side between the
pipe collar and the furnace casing top.
5.
6.
Use only the pipes provided with the roof jack assembly.
Do not add to or adapt other sheet metal pipes. Do not
cut, insert or add other pipes to this assembly.
In no case should there be a gap between sections of
the flue pipe or the combustion air pipe. If necessary to
prevent excessive air leakage, the installer should seal
joints in the combustion air tube with aluminum type or
other suitable sealant.
NEW HOME INSTALLATION
Ifthis furnace is installedon a new home do the following:
1. Inspect the furnace top collars for signs of insulation or
ceiling debris which might have fallen in during cutting of
the ceiling and roof holes. Remove all debris before con-
tinuing.
2. After unpacking the roof jack, check the rain caps. Insure
they are not damaged, tilted or crooked. Do not twist,
crush or sit on the roof caps during installation. Damaged
roof cops will cause improper furnace operation. The fur-
nace willnot heat properly and could result inexplosion.
3. Before inserting the vent pipe into the furnace top,
inspect the furnace flue and combustion air opening for
debris or insulationwhich have fallen in during pre-instal-
lation steps. Do not proceed unless all debris have been
cleaned out or removed.
4.
After installing roof jack on furnace top collar, check to
make sure there is no gap in back or side between the
pipe collar end the furnace casing top. If necessary to
prevent excessive air leakage, the installer should seal
joints in the combustion air tube with aluminum type or
other suitable sealant.
INSTALLATION IN SNOW REGIONS
When the combustion air pipe inlet is covered or blocked with
snow, the furnace will not operate properly due to the
depleted combustion air supply.
Therefore, if the furnace will be located in regions where
snowaccumulation on the roof exceeds 7" or in H.U.D. Snow
Load Zones, a roof jack extension (Part No. 7680B6541) is
recommended.
LOCATING AND CUTTING ROOF JACK OPENING
To facilitate the proper installation of the roof jack, it is very
important that the roof jack opening in the ceiling and roof be
on the same vertical center line as the furnace flue collar. See
Figure 9.
Mark this location on ceiling and scribe a circle with a 5"
radius (10" diameter) around this mark. Cut opening for roof
jack through ceiling and roof. (If furnace was installed during
construction, cover furnace and flue opening to prevent
debris from entering flue when hole is cut for roof jack.)
INSTALLING ROOF JACK IN ROOF
(See Figure 6 & 7 for Dimensional requirements.)
Insert reef jack into opening inthe roof.
The roof jack should be secured to the furnace before roof
flange (flashing) is secured to the roof. This will insure a bet-
ter alignment of the flue pipe and furnace flue collar. Caulk
around and under roof flange to provide a water tight seal,
before secoring roof jack flashing to roof.
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