Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 13)

Figure 14 – Sidewall Combustion Air Inlet

Figure 15 – Air Inlet Cap for Sidewall Termination

To prevent recirculation of flue products from an adjacent vent

cap into the combustion air inlet, follow all applicable

clearance requirements in the latest edition of the National

Fuel Gas Code and/or CAN/CGA-B149 Installation Code and

instructions in the Installation and Service Manual.

You must install the combustion air inlet cap at least one foot

(0.30m) above ground level and above normal snow levels.

The point of termination for the combustion air inlet cap must

be at least 3 feet (0.91m) below the point of flue gas

termination (powered vent cap) if it is located within 10 feet

(3.05m) of the flue outlet from the powered vent cap. Make

sure to properly install the air inlet cap assembly on the air

inlet pipe.

You must install the combustion air inlet cap and the powered

vent cap on the same wall and in the same pressure zone. Do

not install the combustion air inlet cap closer than 10 feet

(3.05m) from an inside corner of an L-shaped structure.

Vertical Rooftop Air Inlet

Use the vertical air inlet terminations available from the pool

heater manufacturer, recommended and/or supplied by the vent

manufacturer, or use two 90° elbows as described on

page 24.

Figure 16 – Roof Top Combustion Air Inlet

Clearances

You must locate the air inlet termination elbow at least 12"

(30cm) above the roof or above normal snow levels.

If the air inlet cap is within a 10 foot (3.05m) radius of the flue

outlet, the point of termination for the combustion air inlet cap

must be at least 3 feet (0.91m) below the point of flue gas

termination (vent cap).

Do not install the combustion air inlet cap closer than 10 feet

(3.05m) from an inside corner of an L-shaped structure.

Combined Air Inlet Points

The air inlet pipes from multiple pool heaters can be combined

to a single common connection if the common air inlet pipe

has a cross sectional area equal to or larger than the total area

of all air inlet pipes connected to the common air inlet pipe.

Example: Two 10" air inlet pipes (78.5 in

area each) have a

total area of 157 in

and will require a 15" (176.7 in

area)

common air inlet pipe.

The air inlet point for multiple pool heater air inlets must be

provided with an exterior opening which has a free area equal

to or greater than the total area of all air inlet pipes connected

Installation and Service Manual

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Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual Page 13

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