Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 16)

IIN NS ST TA AL LL LA AT TIIO ON N Continued
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.
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
Commercial Pool Heaters
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