Lochinvar GAS HEATER FOR COMMERICAL POOL Installation And Service Manual page 19

Installation and Service Manual
Figure 22A – Direct Vent (Illustration with Sidewall Vent
and Sidewall Combustion Air)
Figure 22B – Sidewall Venting
WARNING: Do not combine the flue from
this unit with the vent from any other appliance.
Do not combine flues from multiple appliances
into a common vent. The flue from this unit must
be a dedicated stack.
Connect the flue vent directly to the flue outlet opening on the
top of the pool heater. Make the connections from the pool
heater vent to the outside stack as direct as possible with no
reduction in diameter. Provide adequate clearance to
combustibles for the vent connector and firestop. Follow the
vent manufacturer's instructions when installing sealed AL29-
4C vents and accessories, such as firestop spacers, vent
connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent
connector and firestop.
When planning the venting system, avoid possible contact with
plumbing or electrical wiring inside walls, ceilings, and floors.
Locate the pool heater as close as possible to the chimney or gas
vent. When a vent system is disconnected for any reason, the
flue must be reassembled and resealed according to the vent
manufacturer's instructions.
The installed length of flue from the pool heater to the outside
point of termination must not exceed 50 equivalent feet
(15.2m). Subtract 5 feet (1.5m) of equivalent length for each
90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for
each 45° elbow.
Masonry Chimney Installation
Do not use a standard masonry chimney to directly vent the
combustion products from this pool heater.
To use a masonry chimney, the chimney must use a sealed,
corrosion-resistant liner system. Sealed, corrosion-resistant
liner systems (singlewall, doublewall, flexible, or rigid) must
be rated for use with a high efficiency, positive pressure vent
system.
Corrosion-resistant chimney liner systems are typically made
from a high grade stainless steel such as AL29-4C. The liner
must be properly sized and fully sealed throughout the entire
length. Both the top and bottom of the masonry chimney must
be capped and sealed to provide a dead air space around the
liner.
WARNING: Do not vent this pool heater into
a masonry chimney without a sealed stainless
steel liner system. Any breaks, leaks, or damage
to the masonry flue/tile will allow the positive-
pressure flue products to leak from the chimney
and into occupied living spaces. This could
cause serious injury or death due to carbon
monoxide poisoning and other harmful flue
products.
IMPORTANT: Check with local code officials to
determine code requirements or the advisability
of using a masonry chimney with a sealed
corrosion-resistant liner system.
Sidewall Vent Termination Clearances and Location
Follow all sidewall venting termination information for
clearances and location under Sidewall Vent Termination
Clearances and Location, page 11.
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