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98618/035-20009-001
Rev. B (1205)
COM_INT
AIR PIPE AND
_
MUST BE
FLUE ASSEMBLY
_-_
_BELOW
CEILING
_
_
WARM AIR
-
_-] m
J°
F-
_p_J
PLENUM
OR
/
FURNACE
COMBUSTION
AIR COLLAR
FIGURE 17: Roof Jack Assembly
INTERIOR
EXTENSIONS
It is recommended
(but not mandatory)
that an optional
17" (43.2 cm)
interior extension be used in order to provide easier access for installa-
tion or service for any air conditioning
evaporator
coil, which may be
added to the furnace. To choose the proper length roof jack with or with-
out the optional extension see Figure 17 and Table 9. As indicated in
Figure 18, more than one interior extension may be used to accommo-
date A "dimensions
up to 110" (284.5 cm).
AWARNING
The joint where the optional interior extension connects to the roof
jack must be below the ceiling. Failure to observe this requirement
may result in asphyxiation,
fire, or explosion
NOTE: Use of an interior extension will increase the roof jack adjust-
able heights by the amount of the interior extension height. If the
furnace
is installed on an elevated
plenum, the plenum height
must be added to the roof jack height.
CAUTION]
Do not exceed the maximum adjustable height as listed in Table 9.
These maximum heights allow an additional I 1/2" (3.81 cm) travel
before the flue pipe assembly
is fully extended against the built-in
stop. This provides an additional safeguard against the flue assem-
bly being pulled from the roof jack if upward movement
should
occur when the home is being transported
or subjected
to other
stress conditions.
Failure to follow these instructions
may result in
fire, explosion, or asphyxiation.
TABLE 9: Roof Jack C )tions
Roof Jack Model
Adjustable
Height
Adjustable
Height
with no Interior
with one 17" Interior
Number
Extension
Extension
4000B7141
14" to 78"
64" to 95"
4000B7151
66" to 90"
83" to 107"
4000B8161
59" to 79"
76" to 96"
4000B8181
73" to 93"
90" to 110"
Models 4000B8161 and 4000B8181 have removeable crowns.
CAUTION]
Use 1/2"(1.27cm) bluntorsharp end sheet metal screws tofasten
roof jack combustion air pipe to furnace combustion air collar Screw
holes are provided in pipe and collar. Excessively
long screws may
extend to flue pipe and puncture it. If substitute screws are used,
they must not exceed 1 1/2" (3.81 cm) in length. It is mandatory that
the combustion
air and flue tube assembly
be properly engaged,
and the combustion
air pipe fastened
to the furnace
with sheet
metal screws in the holes provided.
ROOF JACK MUST _r ............................
¢,,
..............
_ FLUE
BE 4000 SERIES
"
AS SHOWN
/_
GASES
i
i
\
CAULK UNDER
iI
"COMBUSTION AIR
FLASHINGS _
CAULK SWIVEL
........................................................
...................
:;_ ...................
--
'
PLENUM
:_\
:f-4
/
i
:::::::::::::::::::::::::::::::::
FLOOR
34"
FIGURE 18: Roof Jack Installation
If using an optional interior extension, place extension down on furnace
top and mate with furnace flue and combustion air collar until it lines up
with screw holes in combustion
air collar. Secure the extension to the
furnace using the p0re-punched
holes. Use 1/2" (1.27 cm) blunt 0or
sharp end sheet metal screws to fasten roof jack combustion air pipe to
furnace combustion air collar. Screw holes are provided in pipe and col-
lar. Excessively
long screws may extend to flue pipe and puncture, it. If
substitute screws are used. they must not exceed 1 1/2" (3.8a cm) in
length. Pull the roof jack flue and combustion air pipe assembly
down
and mate with extension flue and combustion
air pipes until the screw
holes line up. See Figure 18. Fasten interior extension to combustion
air pipe assembly with sheet metal screws not exceeding 1 1/2 (3.8 cm)
in length.
IMPORTANT:
Under no circumstances
shall the connection
between
the flue and combustion air pipe assembly of the roof jack and the inte-
rior extension be above the ceiling line.
Secure the roof jack to the roof with screws. Non-hardening
mastic
sealer or caulking compound
must be used to seal the roof flange to
prevent water leakage. The roof jack swivel joint must also be sealed to
prevent water leakage.
INSTALLING
CEILING
RING
The ceiling ring is to meet fire stop requirements.
Accessory
Ceiling
Ring may be used (see Figure 19) or the mobile home or modular home
manufacturer
or the installer may use other approved methods to fire
stop. If required, three sections of the Accessory ring may be used as in
Figure 19 to provide closer clearance around the roof jack.
NOTE: A portion of the outer edge of the ceiling ring may be trimmed so
the ring will fit between the warm air plenum and roof jack.
\
/
FIGURE 19: Ceiling Ring
VENT
CLEARANCES
IMPORTANT:
The vent must be installed with the minimum clearances
as shown in Figure 20, and must comply with local, state, regional
codes and requirements.
14
Unitary Products Group
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