Installation / Operation Instruction Manual

9 238-49754-00D 9/20
Step 7: Continue installing straight sections of pipe and elbows and support with pipe support clamps as previously
shown a minimum of every 36 inches (1 meter). Run the vent pipe near the outside wall or roof to be terminated. A
Centrotherm ISTAGL-0202, 0303, or 0404 PVC Termination Adapter (2”, 3” or 4” diameters) must be used to connect the
Centrotherm polypropylene vent pipe to PVC pipe first before exiting the wall or roof. The Centrotherm polypropylene
to PVC Vent Adapter has a male ungasketed end and a male outside gasket on the other end. The ungasketed end of
the Centrotherm PVC Termination Adapter is inserted into the last section of the gasketed end of vent pipe. The arrow
on the Centrotherm PVC termination adapter must point toward the vent terminal. Connect the PVC coupling and flue
pipe clamp to the gasketed end of the PVC Termination Adapter. Cut the PVC pipe to the length needed to exit the wall
or roof. Refer to the installation instruction manual supplied with the water heater for information regarding the
location of the vent terminals.
Install the appropriate diameter Centrotherm ISTAGL PVC Termination Adapter on the end of the last pipe.
Install a PVC coupling onto the male gasketed end of the Centrotherm PVC Termination Adapter. A reducer coupling
may be needed to use the supplied vent terminals if a larger pipe diameter size was used. Cement the straight section
of PVC pipe to the PVC pipe coupling. Install the PVC pipe to exit the wall or roof, and then cement the vent terminal
onto the PVC or CPVC pipe. Refer to the venting section of the water heater Installation and Operating Instruction
manual for the appropriate solvent and cement to use. The exhaust vent terminal for the EF model series is shown. Use
the vent terminals supplied with the water heater. See the following photos.
PVC Termination Adapter
PVC termination adapter
PVC Coupling
Arrow points toward outside vent
terminal