Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Horizontal DV Venting Termination

Commercial Pool Heaters

INSTALLATION Continued

90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.

Masonry Chimney Installation

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

To use a masonry chimney, the chimney must use a sealed, corrosion-resistant liner system. Sealed, corrosion-resistant liner systems (singlewall, doublewall, 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 pool heater 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.

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

Vertical DV Venting Termination

You must use the vent termination recommended by the vent manufacturer for vertical direct vent terminations. Follow all vertical venting termination information for clearances and location under Vertical Vent Termination Clearances and Location, page 10.

Horizontal DV Venting Termination

Horizontal venting (air inlet and flue outlet on the same wall) uses the pool heater’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 pool heater manufacturer to ensure proper operation. See TABLE–G, this page, 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 sealed, AL29-4C vent pipe from the pool heater to the vent cap.

Horizontal Vent Termination Clearances and Location

Follow all sidewall venting termination information for clearances and location under Sidewall Vent Termination Clearances and Location, page 11.

TABLE-G

Direct Vent Kits

Input	Horizontal	Vertical
Btu/hr	Kit*	Kit*
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 kit includes a DV box adapter, air inlet cap, and a sidewall vent termination. The VDK kit includes a DV box adapter and an air inlet cap. See note on page 12 concerning DV box adapter.

Flue Pipe Materials

The following manufacturers supply flue materials suitable for these models. All materials are made with AL29-4C stainless steel. Call the numbers below 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 pool heater. The air inlet piping can either be brought in horizontally from a sidewall or vertically from the rooftop. Make sure the combustion air inlet is in the same pressure zone as the vent terminal.

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