Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Vertical DirectAire Venting

Commercial Pool Heaters

INSTALLATION Continued

problems. The temperature of the flue products from a high efficiency pool heater may not be able to sufficiently heat the masonry structure of the chimney to generate proper draft. This will result in condensing of flue products, damage to the masonry flue/tile, insufficient draft and possible spillage of flue products into an occupied living space. Carefully inspect all chimney systems before installation.

Inspection of a Masonry Chimney

A masonry chimney must be carefully inspected to determine its suitability for the venting of flue products. A clay-tile-lined chimney must be structurally sound, straight and free of misaligned tile, gaps between liner sections, missing sections of liner or any signs of condensate drainage at the breaching or clean out. If there is any doubt about the condition of a masonry chimney, it must be relined with a properly-sized and approved chimney liner system. An unlined masonry chimney must not be used to vent flue products from this high- efficiency pool heater. An unlined chimney must be relined with an approved chimney liner system when a new pool heater is being attached to it. Metallic liner systems (Type-B doublewall or flexible or rigid metallic liners) are recommended. Consult with local code officials to determine code requirements or the advisability of using or relining a masonry chimney.

Vertical Vent Termination Clearances and Location Follow all vertical venting termination information for clearances and location under Vertical Vent Termination Clearances and Location, page 10.

You can terminate the combustion air pipe either horizontally with a sidewall air inlet or vertically with a rooftop air inlet. The installed length of air inlet pipe from the pool heater to the outside air inlet cap must not exceed 50 equivalent feet (15.2m).

Figure 18 – Vertical DirectAire Installation with Sidewall Combustion Air Inlet

2. Vertical DirectAire™ Venting

IMPORTANT: Before installing a venting system, follow all venting clearances and requirements found in the Venting, General Information section, page 10.

The Vertical DirectAire™ vent system is the same as the Conventional Negative Draft vent system, except it pulls

combustion air from the outdoors through a sidewall or vertical Figure 19 – Air Inlet Cap for Sidewall Termination air inlet. Follow all requirements in Conventional Negative

Draft Venting, page 14.

The Vertical DirectAire™ vent system requires you to install two vent pipes directly to the pool heater; one vertical pipe with a rooftop termination for the flue products and one pipe for combustion air. For this venting option, you must purchase the DV box adapter. The DV box attaches to the air inlet of the pool heater. The pipe for combustion air attaches to the DV box.

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