Greenheck IG Installation, Operation And Maintenance Manual page 11

3. Install Exhaust Pipe
Slide the exhaust pipe through the CVA. Provide
enough exhaust piping to pass through the wall (or
floor) 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.
INTAKE END
Exhaust Connection
(Model IGX)
Combustion Air Connection
(Model IGX)
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 wall and provide the minimum
clearance of 2 inches between the combustion air
intake and the exterior surface of the outside wall.
Be sure to maintain the minimum clearance of
12 inches between the exhaust pipe termination and
the combustion air intake.
5. Install CVA Assembly
Place the CVA assembly through the wall and verify
that all minimum clearance requirements as specified
in these instructions are met. Secure the CVA
assembly to the wall with corrosion resistant sheet
metal screws through the mounting brackets.
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.
7. Install Combustion Air Inlet Guard and
Exhaust Vent Terminal
Slide the combustion air inlet guard over the exhaust
pipe and fasten it to the combustion air pipe. Attach
the exhaust vent terminal to the discharge end of the
exhaust piping on the outside of the building.
8. Seal Opening
Seal the opening between the wall and the air intake
pipe using an appropriate method.
®
Exhaust Connection
(Model IG)
DISCHARGE
END
Combustion Air Connection
(Model IG)
Concentric Venting – Vertical
Refer to the diagram below for venting on vertical
concentric systems. Maintain at least 12 inches
between the top of the combustion air inlet terminals
and the bottom of the exhaust terminal. (Dim. B).
The bottom of the combustion air intake pipe must
terminate above the snow line or at least 12 inches
above the roof, whichever is greater.
A tee with cleanout must be provided on the
combustion air and exhaust pipe to prevent debris
from entering the heat exchanger.
A = 12 inch minimum, but
should size according to
expected snow depth
B = 12 inch minimum
C = 12 inch minimum
Roof Line
Vent Connection Diameter
Vent terminals must be used. Construct the vent
system as shown in the drawings and refer to the
table for the correct vent connection diameters.
Non-Concentric Vent
Connection Diameter
Furnace
Exhaust Combustion Air
(inches) (inches)
Size (MBH)
75-175
4
200-400
6
Vent Length
Refer to table for minimum and maximum vent
lengths. The total equivalent vent length must include
elbows. The equivalent length of a 4 inch elbow is
6 feet and the
equivalent length
of a 6 inch elbow
Vertical
is 10 feet.
1. Determine Venting Location
Determine the location of the concentric venting
adapter (CVA) based on any clearances that must
be maintained (follow all codes referenced in these
instructions).
Exhaust Vent
Terminal
B
Combustion Air
Inlet Terminal
A
Mounting
Mounting
Bracket
Bracket
C
Tee with
drip leg and
C
clean-out cap
Concentric Vent
Connection Diameter
Exhaust Combustion Air
(inches) (inches)
4 4 6
6 6 8
Vent Minimum Maximum
Length (feet) (feet)
10
Model IG / IGX Make-Up Air
70
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