Lochinvar 999 - 750, CF-CH(E)-i&s-08, 399 Horizontal DV Venting Termination, Flue Pipe Materials

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

Horizontal DV Venting Termination

Horizontal venting uses the unit’s internal combustion air blowers to force the flue products out of the horizontally- terminated flue.

You must purchase a horizontal direct vent kit from the appliance manufacturer to ensure proper operation. See TABLE–G, page 24 to determine which horizontal direct vent kit you need. When installing the vent cap, the wall opening must provide an air space clearance of 2 inches (5.1cm) around the flue pipe. The diameter of the opening for installation of the sidewall cap will be 4 inches (10.2cm) larger (minimum) than the nominal diameter of the installed vent pipe to the horizontal vent cap.

Install the horizontal vent cap from the outside. Mount the vent cap to the wall using four screws or wall anchors. Seal under the screw heads with caulking. Install the Category IV vent pipe from the unit to the vent cap. See detailed instructions packed with the horizontal direct vent kit.

Horizontal Vent Termination Clearances and Location

Follow all sidewall venting termination information for clearances and location under Sidewall Vent Termination Clearances and Location, page 12.

TABLE-G

Direct Vent Kits

Input	Horizontal	Vertical
Btu/hr	Kit*	Kit*
399,999	DVK3004	VDK3026
500,000	DVK3004	VDK3026
650,000	DVK3005	VDK3027
750,000	DVK3005	VDK3027
990,000	DVK3000	VDK3023
1,260,000	DVK3001	VDK3024
1,440,000	DVK3001	VDK3024
1,800,000	DVK3002	VDK3024
2,070,000	DVK3002	VDK3024

*The DVK kits include a DV box adapter, air inlet cap, and a sidewall vent termination. The VDK kits include a DV box adapter and an air inlet cap.

Flue Pipe Materials

The following manufacturers supply flue materials suitable for these models. All materials are made with AL29-4C stainless steel. Call the following numbers for the nearest distributor.

Heat-Fab, Inc. Saf-T CI Vent. 1-800-772-0739.

Protech Systems, Inc. Fas-N-Seal Vent. 1-800-766-3473.

Metal-Fab, Inc. Corr/Guard Vent. 1-800-835-2830.

Combustion Air Inlet Piping

The Direct Vent system requires the installation of a pipe to supply combustion air from the outdoors directly to the unit. Make sure the combustion air inlet is in the same pressure zone as the vent terminal.

In cold climates, use a Type-B double-wall vent pipe or an insulated single wall pipe for combustion air. This will help prevent moisture in the cool incoming air from condensing and leaking from the inlet pipe.

CAUTION: Units that are shut down or will not operate may experience freezing due to convective airflow in the air inlet pipe.

Length of Air Inlet Pipe

The installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2m). Subtract 5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.

Do not exceed the limits for the combustion air inlet piping lengths.

Connecting the Air Inlet Pipe to the Unit

Connect the air inlet piping directly to the unit by attaching it to the DV box adapter. The DV box adapter is included in the direct vent kits for horizontal direct vent. The combustion air inlet area of the unit is located at the right rear corner of the unit. This unit uses a simple air filter to ensure clean air is used for the combustion process. Attach the DV box adapter over the air filter (see FIG. 24). Align screw holes on the DV box adapter with the screw holes surrounding the air filter hanger. Insert sheet metal screws and tighten firmly.

FIG. 24 Attaching DV Box Adapter to Unit

24