12
locating & cutting Roof/ceiling openings
IMPoRtant notE:
Do not allow debris to fall into the furnace. this
could cause unsafe operation and void the furnace
warranty. use the top cap that comes with the furnace
packaging (or alternate protector) to prevent debris
from falling into the furnace before the final roof jack
connection is made.
notE:
Refer to the installation instructions provided
with optional air conditioning packages when installing
furnaces with optional cooling coil cabinet or with optional
C* series indoor coils.
1. Locate center of Roof Jack opening, measure 13 1/2”
from the rear wall of closet or alcove along the center
line of furnace and floor opening. See
2. Cut ceiling and roof holes:
• Ceiling = 8 3/4” (222 mm) diameter
• Roof = 9 3/8” (238 mm) diameter
Installing the Roof Jack
1. Apply caulking compound on underside of roof flashing
to form a continuous strip at least 3/8” wide around the
underside of the perimeter of the flashing. See
or
.
2. Connect Roof Jack Assembly to the furnace. Insert
telescoping Roof Jack Assembly through the opening
cut on the roof.
3. Connect flue pipe to flue collar of furnace. See
4. Connect combustion air pipe to furnace collar with sheet
metal screw. See
notEs:
• It is recommended that the connection of the combustion
air pipe to the furnace be made before the flashing is
secured to the roof to maintain alignment of roof jack
and furnace connections.
• For replacement furnaces, be sure the inner flue pipe
connects over the furnace vent collar.
DO NOT use a
smaller diameter inner flue pipe which could slide
inside the furnace vent collar and restrict the flow
of furnace flue products.
5. Attach Roof Flashing. If necessary, shift roof flashing
slightly in the roof opening so that assembly is in
alignment with furnace.
notE:
If flashing is mounted on 12 degree angle, it
may be necessary to adjust the angle to match the roof
pitch; (1/12 - 4/12 maximum).
6. Press down firmly on roof flashing (over caulking) to
make the seal with roof water tight.
7. Secure flashing with appropriate fasteners.
notE:
For
added protection against leaks, coat the flashing plate
and fasteners with approved roofing compound.
Figure 18
Figure 18. Example of 2½ / 12 slant Jack
with Flashing
5/12 ROOF SLOPE
2
SLANT DECK
/12
1 2
ROOF JACK WITH
2
FLASHING
/12 SLANT
1 2
Figure 19
CEILING
CUT-OUT FOR
FLUE AND
ROOF JACK
CL
CL
24"
20"
13 1/2"
REAR WALL OF CLOSET OR ALCOVE
10"
FURNACE
OUTER
DOOR
FURNACE OUTLINE
Figure 19. cut-out Dimensions for
Flue & Roof Jack
Table 5
Table 5. slant Deck Flashings
RooF JacK
sERIEs
IF RooF
PItcH Is:
slant DEcK
FlasHInG
nuMBER
“X”
FactoR
IS:
“F Series
2” in 12”
903893 (2.5/12)
2-1/8”
2-1/2” in 12”
903893 (2.5/12)
2-1/2”
3” in 12”
903894 (3/12)
2-7/8”
3-1/2” in 12”
903894 (3/12)
3-1/4”
4” in 12”
903895 (4/12)
3-5/8”
“s” series
(2.5 / 12 Pitch only)
4-1/2” in 12”
903895 (2.5/12)
2-1/8”
5” in 12”
903895 (2.5/12)
2-1/2”
5-1/2” in 12”
903894 (3/12)
2-7/8”
6” in 12”
903894 (3/12)
3-1/4”
6-1/2” in 12”
903895 (4/12)
3-5/8”
Optional deck flashings for flat and 2.5/12 pitch roof jacks.
4/12 pitch roof jacks not applicable.
