Greenheck Fan 470656 Concentric Venting – Vertical, Install Exhaust Pipe, Install CVA Assembly

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	Exhaust Connection
(Model IGX)	(Model IG)

DISCHARGE

END

Combustion Air Connection	Combustion Air Connection
(Model IGX)	(Model IG)

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.

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	Exhaust Vent
expected snow depth	Terminal

B = 12 inch minimum		B
C = 12 inch minimum				Combustion Air
	A			Inlet Terminal
	Roof Line
	Mounting			Mounting
	Bracket	EXHAUST	COMBUSTION AIR	Bracket
		C
				Tee with
		C		drip leg and
				clean-out cap

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		Concentric Vent
	Connection Diameter		Connection Diameter
Furnace	Exhaust	Combustion Air	Exhaust	Combustion Air
Size (MBH)	(inches)	(inches)	(inches)	(inches)
75-175	4	4	4	6
200-400	6	6	6	8

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
	Vent	Minimum	Maximum
equivalent length
	Length	(feet)	(feet)
of a 6 inch elbow
	Vertical	10	70
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).

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Model IG / IGX Make-Up Air 11