York DFAH - Manual (Page 17)

107272-UIM-B-1105
Unitary Products Group 17
Models 4000B8161 and 4000B8181 have removable crowns.
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 pre-punched holes. Use 1/2” (1.27 cm) blunt or sharp
end sheet metal screws to fasten roof jack combustion air pipe to fur-
nace 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” (3.8a 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 29. 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.
Secure Roof Jack to Roof
1. Apply caulk or other sealant to underside of Roof Jack flashing.
2. Locate Roof Jack such that pipes are plumb.
3. Secure Roof Jack flashing with nails, screws or staples.
4. Install roofing material over Roof Jack flashing.
5. Seal Roof Jack swivel joint Chemcaulk 900 sealant. Not required
for Roof Jacks with fixed slant flashing.
Complete Installation, as required
1. I nstall Exterior Roof Jack Extension, if applicable. Refer to installa-
tion instructions provided with Exterior Roof Jack Extension. Refer
to Figure 32.
2. Install Crown Assembly, if applicable. Refer to installation instruc-
tions provided with Crown Assembly. If Crown Assembly is not
installed, attach warning tags provided with Roof Jack to: Refer to
Figure 32.
Do not exceed the maximum adjustable height as listed in Table 9.
These maximum heights allow an additional 1 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 Options
Roof Jack
Part Number
Adjustable Height with
no Interior Extension
Adjustable Height with a
17” Interior Extension
IN CM IN CM
4000B7141 14” to 78” 35.6 to 198.1 64” to 95” 162.6 to 241.3
4000B7151 66” to 90” 165.1 to 228.6 83” to 107” 210.8 to 271.8
4000B8161 59” to 79” 149.9 to 200.7 76” to 96” 193.0 to 243.8
4000B8181 73” to 103” 185.4 to 261.6 90” to 110” 228.6 to 279.4
Use 1/2” (1.27 cm) blunt or sharp end sheet metal screws to fasten
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 man-
datory 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.