Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 18)

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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

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.

Commercial Pool Heaters

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