Vent Pipe Sizing And General Installation; Outdoor Installations; Indoor And Outdoor Shelter Installations - Jandy LG125 Installation And Operation Manual

Model LG Pool and Spa Heater
exhausts air from the room where the heater is
installed can deplete the combustion air supply or
reverse the natural draft action of the venting system.
This could cause flue products to accumulate in the
room. Additional air must be supplied to compensate
for such exhaust.
The information in Table 3 is not applicable in
installations where exhaust fans or blowers of any type
are used. Such installations must be designed by
qualified engineers.
If a blower or fan is used to supply air to the
room, the installer should make sure it does not create
drafts which could cause nuisance shutdowns of the
pilot.
The heater must be completely isolated and
protected from any source of corrosive chemical
fumes such as those emitted by trichlorethylene,
perchloroethylene, chlorine, etc.
WARNING
Do not store any chemicals, cleaners, or other
corrosive material near combustion air
openings or in the room. Avoid locating dryer
vents in the vicinity of combustion air openings.
Failure to prevent corrosive materials from
mixing with combustion air can result in
reduced heater life and unsafe heater
operation.
3.2 Vent Pipe Sizing and General
Installation

3.2.1. Outdoor Installations

For outdoor installations, exhaust venting
considerations will determine the placement of the
heater (See Section 2.3.4). If the heater cannot be
placed so as to meet the requirements stated in Section
2.3.4, a vent pipe and cap may be added to the heater
to move the exhaust vent opening to a position that
complies with the requirements. When the heater is
installed in areas of high wind or when unavoidably
installed near a vertical obstruction where
downdrafting may occur, it may be desirable to add a
vent cap directly to the top of the heater. In all cases,
vent pipes and caps must be of the same diameter as
the exhaust outlet of the heater. Approved vent caps
may be obtained through your Jandy distributor.
3.2.2. Indoor and Outdoor Shelter
Installations
WARNING
Vent pipe diameter must be as required by the
National fuel Gas Code ANSI Z223.1 or the
Canadian Installation Codes for Gas
Appliances CAN/CSA-B149.1. Undersize pipe
can result in inadequate venting and oversize
pipe can result in vent condensation. In either
case the result can be release of combustion
products to the indoors. This can cause
serious injury or death by carbon monoxide
poisoning or asphyxiation.
All indoor installations and outdoor shelter
installations require the addition of a factory approved
drafthood. The drafthood must be installed without
modification.
All vent installations must be made in accordance
with all local, state or provincial codes and with:
1. Chapter covering "Venting of Equipment" of the
national Fuel Gas Code, ANSI 223.1 latest
edition , or the applicable provisions of the local
building codes.
2. In Canada , CAN/CSA-B149.1.
Avoid long horizontal runs of the vent pipe, and
90° elbows, reductions and restrictions. Horizontal runs
should have at least a 1/4 inch rise per foot (20mm
per meter) in the direction of flow.
Avoid terminating heater vents near air condition-
ing or air supply fans. The fans can pick up exhaust
flue products from the heater and return them inside
the building, creating a possible health hazard.
Do not locate the vent terminal where flue
products could strike against building materials and
cause degradation.
Vent opening should be well away from trees or
other obstructions that would prevent free air flow to
and from vent terminal. Do not terminate the vent
under decks, stairways, or car ports.
Be sure to support all venting so that connections
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