Empire Comfort Systems DVD48FP5, DVD42FP5, DVD48FP3 Vertical Termination, General Maintenance

VERTICAL TERMINATION

Locate and mark the center point of the vent pipe using a nail on the underside of the roof. Drive the nail through the center point. Mark the outline of the roof hole around this center point.

NOTE: Size of the roof hole dimensions depend on the pitch of the roof. There must be a 1 inch clearance (25mm) to the vertical pipe sections. This clearance is to all combustible material.

Cover the opening of the vent pipe and cut and frame the roof hole. Use framing lumber the same size as the roof rafters and install the frame securely. Flashing anchored to frame must withstand high winds. The storm collar is placed over this joint to make a water- tight seal. Non-hardening sealant should be used to completely seal this flashing installation.

Determining Minimum Vent Height Above the Roof.

WARNING: Major U.S. building codes specify minimum chimney and/or vent height above the roof top. These minimum heights are necessary in the interest of safety. These specifica- tions are summarized in Figure 47.

	LOWEST
	DISCHARGE
VENT CAP	OPENING

GAS VENT

H

	ROOF PITCH IS X/12
	H (Min.) - Minimum height from
	roof to lowest discharge opening
ROOF PITCH		H (Min.)
Flat to 6/12		12" (305 mm)
6/12 to 7/12		15" (381 mm)
Over 7/12 to 8/12		18" (457 mm)
Over 8/12 to 16/12		24" (610 mm)
Over 16/12 to 21/12		36" (914 mm)

Figure 47

Note that for steep roof pitches, the vent height must be increased. In high wind conditions, nearby trees, adjoining roof lines, steep pitched roofs, and other similar factors can result in poor draft, or down-drafting. In these cases, increasing the vent height may solve this problem.

Figure 58

When terminating the vent cap near an exterior wall or overhang, maintain minimum clearances as shown in Figure 48.

General Maintenance

Conduct an inspection of the venting system semi-annually. Recommended areas to inspect are as follows:

1.Check areas of the venting system which are exposed to the elements for corrosion. These will appear as rust spots or streaks and, in extreme cases, holes. These components should immediately be replaced.

2.Remove the cap and shine a flashlight down the vent. Remove any bird nests or other foreign material.

3.Check for evidence of excessive condensate, such as water droplets forming in the inner liner and subsequently dripping out at joints. Condensate can cause corrosion of caps, pipe and fittings. It may be caused by having excessive lateral runs, too many elbows and exterior portions of the system being exposed to cold weather.

4.Inspect joints to verify that no pipe sections or fittings have been disturbed and, consequently, loosened. Also, check mechanical supports, such as wall straps or plumbers’ tape for rigidity.

Venting terminal shall not be recessed into a wall or siding.

Aremovable panel or other means must be provided in the enclosure for visual inspection of the flue connection.

NOTE: This also pertains to vertical vent systems installed on the outside of the building.

Slide the vertical top SD-991 over the ends of the vent pipe and secure. (See Figure 49)

Installing the Vent System in a Chase

A chase is a vertical box-like structure built to enclose the gas appliance and/or it’s vent system. Vertical vent runs on the outside of a building may be, but are not required to be installed inside a chase.

Figure 49

CAUTION: Treatment of firestop spacers and construction of the chase may vary with the type of building. These instructions are not substitutes for the requirements of local building codes. Therefore, your local building codes must be checked to determine the requirements for these steps.

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