Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 14)

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Installation - Concentric Venting (Vertical)
Step 3 Install Exhaust Pipe
Slide the exhaust pipe through the CVA.
Be sure to provide enough exhaust piping to pass
through the roof and provide the minimum clearance
of 12 inches between the exhaust pipe termination
and the combustion air intake.
With all required clearances satisfied, attach the
exhaust pipe to the CVA.
Step 4 Install Combustion Air Pipe
Attach a field supplied combustion air pipe to the
concentric side of the CVA. Be sure to provide enough
combustion air piping to pass through the roof and
provide the minimum clearance of 12 inches between
the combustion air intake and the exterior surface of
the roof. This clearance may need to be increased to
allow for snow accumulation. Be sure to maintain the
minimum clearance of 12 inches between the exhaust
pipe termination and the combustion air intake.
Step 5 Install CVA Assembly
Place the entire CVA assembly through the roof and verify that all minimum clearance requirements as specified
in these instructions are met. Secure the CVA assembly to the ceiling with corrosion resistant sheet metal screws
through the mounting brackets.
Step 6 Attach CVA Assembly to Unit
Attach the exhaust pipe to the unit’s combustion exhaust. Using an additional combustion air pipe, connect the
unit’s combustion air supply intake to the combustion air connection on the CVA. Be sure to include the required
tee’s with drip legs and clean outs.
Step 8 Seal Opening
Seal the opening between the roof and the air intake pipe using an appropriate method.
Step 7 Install Terminals
Slide the combustion air terminal over the vent pipe and fasten it to the combustion air pipe. Attach the exhaust
vent terminal to the discharge end of the exhaust piping.
Installation
Exhaust
Connection
(Model IG)
Exhaust
Connection
(Model IGX)
Combustion Air
Connection
(Model IG)
Combustion Air
Connection
(Model IGX)
Intake End
Discharge
End