Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Direct Venting, Flue Outlet Piping

Installation and Service Manual

For proper operation, a barometric damper is provided for Horizontal DirectAireTM installations. The damper will help to ensure a draft between negative 0.04 to 0.08 inches w.c.

TABLE-F

Horizontal DirectAire™ Kits

Input

Btu/hr Kit*

500,000 HDK3031

650,000 HDK3032

750,000 HDK3032

990,000 HDK3037

1,260,000 HDK3038

1,440,000 HDK3038

1,800,000 HDK3039

2,070,000 HDK3039

*These kits include a sidewall venter assembly, vent termination, DV box adapter, sidewall air inlet cap, and a barometric damper. See note on page 12 concerning DV box adapter.

5. Direct Venting

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

This option uses sealed AL29-4C vent materials for the flue outlet piping and separate combustion air inlet piping. This system terminates both the flue and combustion air inlet in the same pressure zone. The flue outlet and combustion air intake may terminate at either a sidewall or the rooftop.

To use the optional Direct Vent system, you must install specific vent kits and venting materials. The following is a detailed explanation of Direct Vent installation requirements, including the components used and vent kit part numbers.

Flue Outlet Piping

Venting Guidelines

If using this venting option, a sealed AL29-4C venting system for flue products is required on all models of this pool heater. This venting system operates with a positive pressure in the vent. The internal combustion air blowers generate this positive pressure which operates the combustion process and also exhausts the flue products from the building.

This vent system has specific vent material and installation requirements. Only use listed sealed AL29-4C vent system

materials. Follow all installation requirements. See TABLE–B, page 11 for proper pipe size for your pool heater. A list of sealed AL29-4C flue pipe manufacturers is located on page 22.

Seal all vent joints and seams gas-tight.

Drain Tee Installation

A drain tee must be installed in the vent pipe to collect and dispose of any condensate that may occur in the vent system. The drain tee must be installed as the first fitting after the horizontal ell on the top of the unit (see Figure 22A). Plastic drain tubing, sized per the vent manufacturer’s instructions, shall be provided as a drain line from the tee. The drain tubing must have a trap provided by a 3" (7.6cm) diameter circular trap loop in the drain tubing. Prime the trap loop by pouring a small quantity of water into the drain hose before assembly to the vent. Secure the trap loop in position with nylon wire ties. Use caution not to collapse or restrict the condensate drain line with the nylon wire ties. The condensate drain must be routed to a suitable drain for disposal of condensate that may occur in the direct vent system. Refer to the condensate drain installation instructions as supplied by the manufacturer of the vent material.

￿WARNING: Do not combine the flue from this unit with the vent from any other appliance. Do not combine flues from multiple appliances into a common vent. The flue from this unit must be a dedicated stack.

Connect the flue vent directly to the flue outlet opening on the top of the pool heater. Make the connections from the pool heater vent to the outside stack as direct as possible with no reduction in diameter. Provide adequate clearance to combustibles for the vent connector and firestop. Follow the vent manufacturer’s instructions when installing sealed AL29- 4C vents and accessories, such as firestop spacers, vent connectors, thimbles, caps, etc.

Provide adequate clearance to combustibles for the vent connector and firestop.

When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls, ceilings, and floors. Locate the pool heater as close as possible to the chimney or gas vent. When a vent system is disconnected for any reason, the flue must be reassembled and resealed according to the vent manufacturer’s instructions.

The installed length of flue from the pool heater to the outside point of termination must not exceed 50 equivalent feet (15.2m). Subtract 5 feet (1.5m) of equivalent length for each

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