Odyssey
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Installation and Operation Instructions - Direct Vent
CT80-250
24
Sealing
Proper Sealing - This Balanced Flue system will leak if the following sealing procedures
are not followed. It’s easier to seal the entire system properly the first time than return at a
later date and have to remove the connections to reseal it.
The adapters are multi-start, left hand thread, with one thread twice the width of the
others. Therefore, care must be taken to ensure that the correct threads are engaged before
tightening in a counter clockwise direction.
Clearances to Combustibles - The vent must have 9” clearance to combustible within 36” of the appliance
breech. The remaining section of the vent to the terminal can have a minimum of 1” clearance. The terminal is
rated for 0” clearance.
Recommended Sealing Method - Because the balanced flue system operates with a positive pressure in the
exhaust at all times, the sealing has to be done properly to prevent leaks at the joints. The type of sealant used
throughout this installation is critical to the operation of the balanced flue system. A tube of high temperature
silicone is provided with the installation kit (#81453). This tube should be sufficient for the whole installation,
but if more sealant is needed buy one of the following: GE 106, Dow Corning 736 Heat Resistant Sealant,
Perimeter 248 High Temp or RTV Silicone Gasket.
It’s the installer’s responsibility to ensure that combustion products do not enter the home.
To obtain a good seal between the Vent Terminal and the building wall, follow Steps “A” through “J”
illustrated in Figure 7-6:
PART 1: Boiler
A.
Seal the 5” smoke collar to the smoke hood on the boiler with the high temperature silicone. Inspect all boiler
openings (sight door, burner connection, pipe joints, Etc) during initial operation, to verify there are no leaks.
Flex Pipe - Make sure that it’s long enough to form long radius bends (no smaller than 1 ft
in radius). If the flex is too long, it can be cut with a hacksaw.
Flex Adapter Collar - It is recommended to remove the collar on the 81098 & 81112 flex adapters that secure
the insulation and outer foil of the flex pipe. This can be accomplished by removing the pop rivet at the base of
the collar, and backing off the gear clamp completely. After removing the collar, you will get an unobstructed
view of the pipe joint. To reinstall, put the collar back into place and install a #8 x ½” screw in rivet hole, and re-
thread the gear clamp.
PART 2: Flex Pipe
B.
Pull the outer foil sheathing and insulation back to give an unobstructed view of the pipe joints. Put 1 bead of
silicone on both inside ends of the insulated flex pipe, approximately 1” wide and ½” from the end. Put 1
bead of silicone on both outside ends of 81098 & 81112 connectors, approximately 1” wide and 1” from the
bottom of the threads. Screw in part number 81089 & 81112 adapters into the insulated flex and pull the
insulation and the outside flex over the collar and tighten the gear clamp.
C.
Apply a wide bead on top of the flex joint.
D.
Reinstall the collars on the vent connectors using a #8 x ½” screw in rivet hole, and re-thread the gear clamp
E.
Apply silicone between the vertical overlap joint of the 5” to 3” adapter.
F.
Apply silicone on inside surface of the 5” to 3” adapter.
G.
Apply silicone on outside surface of the boiler cast collar, and slide 5” to 3” adapter over the smoke hood and
tighten the gear clamp.
H.
Perform steps D-G to install the 3” adapter #81098 over the 3” vent terminal, and tighten gear clamp.
I.
Fold the vent terminal heat shield flaps back into position.
J.
Refer to Figure 7-7 for an illustration of a typical balanced flue installation for an Odyssey boiler (CT90-120).
