Installation & Operation Manual

2 Venting (continued)

Masonry chimney installation

Do not use a standard masonry chimney to directly vent the combustion products from this unit.

To use a masonry chimney, the chimney must use a sealed, corrosion-resistant liner system. Sealed, corrosion-resistant liner systems (single-wall, double-wall, flexible, or rigid) must be rated for use with a high efficiency, positive pressure vent system.

Corrosion-resistant chimney liner systems are typically made from a high grade stainless steel such as AL29-4C. The liner must be properly sized and fully sealed throughout the entire length. Both the top and bottom of the masonry chimney must be capped and sealed to provide a dead air space around the liner.

￿WARNING

Do not vent this unit into a masonry chimney without a sealed stainless steel liner system. Any breaks, leaks, or damage to the masonry flue/tile will allow the positive-pressure flue products to leak from the chimney and into occupied living spaces. This could cause serious injury or death due to carbon monoxide poisoning and other harmful flue products.

NOTICE

Check with local code officials to determine code requirements or the advisability of using a masonry chimney with a sealed corrosion-resistant liner system.

Horizontal DV venting termination

Horizontal venting uses the unit’s internal combustion air blower 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. 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 22.

TABLE - 2E

DIRECT VENT KITS

MODEL

HORIZONTAL

VERTICAL

MODEL

HORIZONTAL

VERTICAL

KIT*

KIT*

KIT*

KIT*

 

 

402

DVK3004

VDK3026

992

DVK3000

VDK3023

502

DVK3004

VDK3026

1262

DVK3001

VDK3024

652

DVK3005

VDK3027

1442

DVK3001

VDK3024

752

DVK3005

VDK3027

1802

DVK30000

VDK3024

--

--

--

2072

DVK30000

VDK3024

*These 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.

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.

27

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Lochinvar 402 - 2072 Horizontal DV venting termination, Masonry chimney installation, Combustion air inlet piping

402 - 2072 specifications

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