Installation

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nal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ooropening.SeeFigure 19.
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ashing
to form a continuous strip at least 3/8” wide around the
undersideoftheperimeteroftheashing.SeeFigure
20 or Figure 21 (page 13).
2. Connect roof jack assembly to the furnace. Insert
telescoping roof jack Assembly through the opening
cut on the roof.
3.Connectuepipetouecollaroffurnace.SeeFigure
22 (page 13).
4. Connect combustion air pipe to furnace collar with sheet
metal screw. See Figure 22.
NOTES:
• Itisrecommendedthattheconnectionofthecombustion
airpipetothefurnacebemadebeforetheashingis
secured to the roof to maintain alignment of roof jack
and furnace connections.
• Forreplacementfurnaces,besuretheinneruepipe
connects over the furnace vent collar. DO NOT use a
smallerdiameterinneruepipewhichcouldslide
insidethefurnaceventcollarandrestricttheow
offurnaceueproducts.
5.Attach roof ashing. If necessary, shift roof ashing
slightly in the roof opening so that assembly is in
alignment with furnace.
NOTE: If ashing 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rmlyonroofashing(overcaulking)to
make the seal with roof water tight.
7.Secureashingwithappropriatefasteners. NOTE:For
addedprotectionagainstleaks,coattheashingplate
and fasteners with approved roofing compound.
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
CEILING
CUT-OUT FOR
FLUE AND
ROOF JACK
C
L
C
L
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ashingsforatand2.5/12pitchroofjacks.
4/12 pitch roof jacks not applicable.