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Masonry Chimney Installations
A masonry chimney must be properly sized for the installation of a
high efficiency gas-fired pool heater. Venting of a high efficiency
pool heater into a cold or oversized masonry chimney can result in
operational and safety problems. Exterior masonry chimneys, with
one or more sides exposed to cold outdoor temperatures, are more
likely to have venting problems. The temperature of the flue
products from a high efficiency pool heater may not be able to
sufficiently heat the masonry structure of the chimney to generate
proper draft. This will result in condensing of flue products,
damage to the masonry flue/tile, insufficient draft and possible
spillage of flue products into an occupied living space. Carefully
inspect all chimney systems before installation.
Inspection of a Masonry Chimney
A masonry chimney must be carefully inspected to determine its
suitability for the venting of flue products. A clay-tile-lined
chimney must be structurally sound, straight and free of misaligned
tile, gaps between liner sections, missing sections of liner or any
signs of condensate drainage at the breaching or clean out. If there
is any doubt about the condition of a masonry chimney, it must be
relined with a properly-sized and approved chimney liner system.
An unlined masonry chimney must not be used to vent flue
products from this high-efficiency pool heater. An unlined chimney
must be relined with an approved chimney liner system when a new
pool heater is being attached to it. Metallic liner systems (Type-B
doublewall or flexible or rigid metallic liners) are recommended.
Consult with local code officials to determine code requirements or
the advisability of using or relining a masonry chimney.
Vertical Vent Termination Clearances and Location
Follow all vertical venting termination information for clearances
and location under Vertical Vent Termination Clearances and
Location, page 10.
Commercial Pool Heaters
INSTALLATION
Continued
2. Vertical DirectAire™ Venting
IMPORTANT: Before installing a venting system,
follow all venting clearances and requirements
found in the Venting, General Information section,
page 10.
The Vertical DirectAire™ vent system is the same as the
Conventional Negative Draft vent system, except it pulls
combustion air from the outdoors through a sidewall or vertical air
inlet. Follow all requirements in Conventional Negative Draft
Venting, page 14.
The Vertical DirectAire™ vent system requires you to install two
vent pipes directly to the pool heater; one vertical pipe with a
rooftop termination for the flue products and one pipe for
combustion air. For this venting option, you must purchase the DV
box adapter. The DV box attaches to the air inlet of the pool heater.
The pipe for combustion air attaches to the DV box.
You can terminate the combustion air pipe either horizontally with a
sidewall air inlet or vertically with a rooftop air inlet. The installed
length of air inlet pipe from the pool heater to the outside air inlet
cap must not exceed 50 equivalent feet (15.2m).
Figure 18 – Vertical DirectAire Installation with Sidewall
Combustion Air Inlet
Figure 19 – Air Inlet Cap for Sidewall Termination
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