Two Pipe Venting Installation - Horizontal - LG AR-DR12-05A Installation And Operation Manual

INDIRECT GAS FIRED FURNACES

Two Pipe Venting Installation - Horizontal

Attach CVA Assembly to Unit
Connect the unit's combustion exhaust to the exhaust connection on the CVA. Connect the unit's combustion air supply intake to the com-
bustion air connection on the CVA. Be sure to include the required tee's with drip legs and clean-outs.
Install Combustion Air Inlet Guard and Exhaust Vent Terminal
Slide the combustion air terminal over the vent pipe and fasten it to the combustion air pipe. Attach the exhaust vent terminal to the dis-
charge end of the exhaust piping.
Seal Opening
Seal the opening between the roof and the air intake pipe using an appropriate method.
Two Pipe Venting Installation – Horizontal
Refer to the diagram for venting on horizontal two pipe systems. Maintain at least 12 inches of clearance between the exhaust pipe termina-
tion and the exterior surface of the exterior wall.
The combustion air pipe must be a minimum of 12 inches from the exhaust pipe and 2 inches from the exterior surface of the outside wall.
A maximum of 48 inches of building wall thickness is required for separated combustion vent pipe.
Vent Connection Diameter
Figure 40: Two Pipe Venting - Horizontal
Vent terminals must be
used. The vent kit includes
two terminals per furnace.
Construct the vent system
as shown in the drawings
and refer to the table for
the correct vent connection
diameters.
Vent Length
Refer to table for minimum
and maximum vent lengths.
The minimum vent length is
5 feet and the maximum vent
length is 50 feet. 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 is 10 feet.
Install Exhaust Pipe
Run an exhaust pipe from the unit's combustion exhaust through the exterior wall to the outdoors. The exhaust pipe must terminate at least
12 inches from the outside surface of the outside wall. Attach exhaust vent terminal to the end of the exhaust pipe. Using field-supplied
mounting brackets, support the exhaust pipe as needed.
Install Combustion Air Pipe
Run a combustion air pipe from the unit's combustion air intake through the exterior wall to the outdoors.
The combustion air pipe must terminate at least 12 inches from the exhaust vent pipe and 2 inches
from the exterior surface of the outside wall. Attach the combustion air inlet guard to the end of the combustion air pipe. Using field-supplied
mounting brackets, support the combustion air pipe as needed.
Seal Wall Openings
Using an appropriate method, seal the wall openings around the piping.
Due to our policy of continuous product innovation, some specifications may change without notification.
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