G115 Direct Vent Installation Instructions

Installation of Insulated Flexible Oil Vent.

1. Apply a ¼" wide bead of high temperature silicone all around the boiler vent connection 1" from

the end. Install 5" to 4" reducer on boiler vent connection. Secure properly with a clamp.

2. Carefully measure the required length of vent pipe and cut with a hacksaw. Allow for the two end

adapters in your measurement.

3. Apply a small bead of silicone to the outside of the oil vent ends. Twist end adaptors to each end

of the oil vent. Turn adaptors counter clockwise. Engage the outer cover of the adaptor evenly

over the exterior of the vent pipe. Turn the adaptor until the vent pipe interior seats evenly

against the expanded teflon gasket of the end connector. Secure adaptors to the vent pipe with

the provided clamps.

4. Apply a ¼" wide bead of high temperature silicone all around at the 5" x 4" boiler reducer and

wall termination connection. Slide adaptors on reducer and wall termination pipe all the way.

Tighten with clamps.

5. Support the flexible vent pipe at regular intervals with brackets or hangers. Maintain a 1/4" rise

per foot on horizontal runs. Avoid any sag in the vent. Do not bend pipe excessively.

NOTE: Wrap 3" ceramic insulation around adaptor near termination and secure with sheet metal

or foil tape and hose clamps to maintain 1" clearance.

Installation of Galvanized Vent Pipe.

1. Apply a ¼" wide bead of high temperature silicone all around the boiler vent connection 1" from

the end. Install 5" to 4" reducer on boiler vent connection. Secure properly with a clamp.

2. Install 4" galvanized vent pipe (maximum of 6 ft) and 90º elbows (maximum of 2) as needed.

Apply high temperature silicone at all pipe joints and screw heads. Make sure all joints are sealed

hermetically.

IMPORTANT NOTICES:

Once the entire venting system is installed, make sure all joints are secure. All seams and joints of the

exhaust venting must be checked for gas tightness. High temperature tape or high temperature

silicone sealant can be used to ensure an air-tight venting system. It is required to have the entire system

checked and serviced by a qualified technician at least once annually following initial installation.

Installation Procedure for Air Intake Terminal and Inlet Air Pipe

1. Cut properly sized opening in the outside wall and install the 4" air intake hood. (Applies only

when the Aerocowl termination is used). Caulk as needed.

2. Install a 4" air supply pipe from the intake terminal to the air intake boot on the burner.

Galvanized pipe (4") or flexible 4" metal piping can be used. Use minimum number of elbows

and keep the total pipe length to a minimum. Properly support pipe sections every 4 feet with a

hanger or bracket. The installation must comply with all local codes and authorities having

jurisdiction.

Note: In climates where the outside air temperature drops below -20 ºF, it is recommended to

have a minimum of 6 to 8 ft of 4” diameter metal pipe in conditioned (warm) space to prevent

cold combustion air from causing fuel gelling problems. A vacuum relief breaker on the air intake

side can also be used to draw in some conditioned combustion air.

3. Total inlet pipe length is not to exceed total equivalent length of 15 ft. In case an outside intake

riser (Fig. 1) is used, add in this intake length to the total inlet pipe length. (Allow 1 ft for each 90º

elbow).

4. Use the provided 4" to 3" reducer to connect duct to burner intake (Riello burner only). Secure

with silicone to burner intake. Use wrap-around clamps at both the burner and the inlet

termination to provide an easy means of disconnecting the combustion air intake from the burner

for service and inspection purposes.