129098-UIM-G-0411
Johnson Controls Unitary Products
17
EXTERIOR ROOF JACK EXTENSION
Available to comply with instances in which the roof jack crown needs to
be raised to meet a roof clearance requirement. One extension will
raise the roof jack crown by 18 inches.
CONNECTING ROOF JACK TO FURNACE
NOTE:
Combustion air tube and flue pipe are part of the same assem-
bly. Only the combustion air tube need be fastened to the furnace.
1.
Check to be certain that the flue pipe and combustion air tube are
present.
2.
Pull the telescoping flue tube and combustion air tube assembly
down from the roof jack. Slide the flue tube/combustion air tube
assembly down firmly over the furnace flue outlet and combustion
air collar. Insure that the back, side and front of combustion air
tube collar is fully engaged and is in contact with gasket. Fasten
the combustion air tube to the furnace combustion air collar using
a 1/2 inch sheet metal screw. (Screw hole provided in combustion
air tube and furnace combustion air collar. See Figure 24).
COMBUSTION AND VENTILATION AIR
This furnace is a sealed combustion (direct vent) unit and is design cer-
tified to use only a 4000 Series roof jack. These roof jacks are designed
to provide combustion air to the furnace and to exhaust flue products to
the outside. No other combustion air openings or ducts are needed.
FIGURE 23:
Roof Jack
UPPER
CAP
LOWER
CAP
CROWN
ASSEMBLY
BASE
STEP 1:
Remove upper and lower cap.
Remove the two (2) screws
that secure the upper cap to
the crown assembly base and
remove the upper cap. Next,
remove the three (3) screws
that secure the lower cap to
the crown assembly base.
Set bothcaps aside for later use.
Extension
Crown
Assembl
y
Base
STEP 2:
Place the roof jack extension on top of the
crown assembl
y
base, pushing down firml
y
to assure a snug fit.
IMPORTANT:
Make sure that the pipes are
connected.
Using the four (4) holes at the base of the
extension as a guide, drill four (4) holes
1/8” diameter into the crown assembl
y
base.
Secure the extension to the crown assembl
y
base with the four (4) screws provided.
Install the lower cap on top of the extension
so that the center pipe sticks through
the hole in the lower cap.
UPPER
CAP
LOWER
CAP
EXTENSION
BRACKET
EXTENSION
CROWN
ASSEMBLY
BASE
STEP 3:
Reinstall upper and lower cap to extension.
Using the three (3) screws removed
in Step 1, attach the lower cap to the
extension bracket. Install the upper
cap over the center pipe of the extension.
Using the two (2) holes located at the
base of the upper cap as guides, drill
two (2) 1/8” diameter holes into the center pipe.
Finally, attach the upper cap to the center
pipe using the two (2) screws removed in
Step 1 to the center pipe.
STEP 4:
Complete assembly.
Place these instructions in the customer
packet provided with the furnace.
The inner flue pipe must be present.
It is mandatory that the combustion air pipe and flue pipe assem-
bly be fully engaged. The combustion air pipe MUST be securely
fastened to the furnace with a sheet metal screw in the hole pro-
vided.
Use a 1/2" blunt or sharp end sheet metal screw to fasten roof
jack combustion air pipe to furnace combustion air collar. Screw
hole is provided in the pipe and collar. Excessively long screws
may extend to flue pipe and puncture it. Screws are not to
exceed 1 1/2" in length.
FIGURE 24:
Connecting Roof Jack to Furnace
COMBUSTION
AIR TUBE
SECURE STRAP
TO WALL
FLUE
PIPE
FURNACE
FLUE OUTLET
GASKET
FRONT OF
FURNACE
COMBUSTION
AIR TUBE COLLAR
It is mandatory that the combustion air and flue tube assembly
be fully engaged at back sides and front, and combustion air
tube securely fastened to the furnace with a sheet metal screw
in the screw hole provided.
#8 OR #10 SCREW
RECOMMENDED
