Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Sidewall Fan, Sidewall Venting Termination

Commercial Pool Heaters

INSTALLATION Continued

Sidewall Fan

The sidewall fan can be mounted on the inside/outside (depending upon model) with a sidewall vent hood installed on the exterior wall. The sidewall fan and accessories are included in a venting kit provided by the appliance manufacturer. See TABLE–E for kit numbers.

The venting kit includes the sidewall fan, vent hood, tapered vent adapter, barometric damper, proving switch and all necessary relays to interlock with the heaters control system. The tapered vent adapter reduces the vent size at the inlet to the fan. There should be no reduction in vent diameter from the pool heater’s flue outlet to the sidewall fan. The barometric damper must be installed on the flue and adjusted to supply a negative draft within the range of 0.04 to 0.08 inches w.c. while the pool heater is operating.

Flue Outlet Piping

With this venting option, you must use Type-B doublewall (or equivalent) vent materials. Vent materials must be listed by a nationally-recognized test agency for use as vent materials. Make the connections from the pool heater vent to the sidewall fan/cap as direct as possible with no reduction in diameter. Use the National Fuel Gas Code venting tables for doublewall vent to properly size all vent connectors and stacks. Follow the vent manufacturer’s instructions when installing Type-B vents and accessories, such as firestop spacers, vent connectors, thimbles, caps, etc.

When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls.

The maximum installed length of sidewall vent pipe with an induced draft fan must not exceed 100 feet (30.5m) on the 500,000 - 2,070,000 Btu/hr models. Note: Models 990,000 - 2,070,000 are not approved for sidewall venting without a fan. The maximum installed length of sidewall vent pipe without an induced draft fan must not exceed 50 feet (15.2m) on the 500,000 - 750,000 Btu/hr models. Subtract 5 feet (1.5m) for each 90° elbow. Subtract 2.5 feet (0.7m) for each 45° elbow.

Sidewall Venting Termination

The sidewall vent cap must be installed on an exterior sidewall. The sidewall fan/powered sidewall vent cap and accessories are included in a venting kit which is furnished by the pool heater manufacturer in accordance with CSA International requirements. This venting kit includes the powered sidewall fan/cap, proving switch and all necessary relays to interlock with the pool heater’s control system.

The sidewall fan/powered vent cap must be interlocked with the pool heater’s control system to start the fan on a call for heat and prove fan operation before the pool heater fires. Plug- in and terminal strip connections are provided on the pool heater for easy connection of the factory supplied vent kit and control package for the sidewall vent fan.

Sidewall Venting Without Fan

For 500,000 - 750,000 Btu/hr models approved for sidewall venting without an external power vent fan, you must install specific vent kits and venting materials. The following is a detailed explanation of Sidewall Venting Without an External Fan installation requirements.

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 Figures 22A and 22B). 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.

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