Lochinvar EnergyRite ER302 - Manual (Page 22)

Installation & Operation Manual
22
4
Vertical venting
Incorrect installation and/or location of the air inlet opening
can allow the discharge of flue products to be drawn into the
combustion process on the pool heater. This can result in
incomplete combustion and potentially hazardous levels of
carbon monoxide in the flue products. This will cause
operational problems with the pool heater and possible spillage
of flue products which can cause personal injury, death, or
property damage.
Length of air inlet pipe
The total equivalent length of the DirectAire sidewall or vertical
rooftop combustion air inlet pipe must not exceed a maximum
of 50 equivalent feet in length. Subtract 5 feet for each elbow in
the air intake system. Do not exceed limits for the combustion
air inlet piping lengths.
Combined air inlet points
The air inlet pipes from multiple pool heaters installed with the
DirectAire venting system can be combined to a single common
connection. The common air inlet pipe must have 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
5" air inlet pipes (19.6 in
2 area each) have a total of 39.2 in 2 and
will require a single 8" (50.3 in 2 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 to
the common air inlet. This exterior opening for combustion air
must connect directly to the outdoors. The total length of the
combined air inlet pipe must not exceed a maximum of 50
equivalent feet. Subtract 5 feet for each elbow in the air inlet
pipe. You must deduct the restriction in area provided by any
screens, grills, or louvers installed in the common air inlet point.
These are common on the sidewall air inlet openings. Screens,
grills, or louvers installed in the common air inlet can reduce the
free area of the opening from 25% (metal louvers) to 75%
(wood louvers) based on the materials used.
Air inlet pipe materials
The DirectAire Vertical system requires installation of a separate
pipe to supply combustion air from outdoors directly to the
unit. The following air inlet pipe materials and sealing
recommendations apply whenever an optional venting system is
used to duct combustion air directly to the pool heater.
The air inlet pipe(s) must be sealed. Choose acceptable
combustion air inlet pipe materials from the following specified
materials in this section.
PVC, CPVC, or ABS (4" or 5" I.D.)*
Dryer Vent (not recommended for rooftop air inlet)
Galvanized steel vent pipe with joints and seams
sealed as specified below.
Type “B” double-wall vent with joints and seams
sealed as specified below.
* Plastic pipe requires an adapter (not provided) to
transition between the air inlet and cap.
Sealing of single-wall galvanized or Type “B” double-wall vent
material used for combustion air supply in a DirectAire Vent
System:
a. Seal all joints and seams of the air inlet pipe using
either aluminum foil duct tape meeting UL Standard
723 or 181A-P or a high quality UL listed silicone
sealant such as those manufactured by Dow Corning
or General Electric.
b. Do not install seams of air inlet pipe on the bottom
of horizontal runs.
c. Secure all joints with a minimum of three sheet metal
screws or pop rivets. Apply aluminum foil duct tape or
silicone sealant to all screws or rivets installed in the air
inlet pipe.
d. Ensure that the air inlet pipe is properly supported.
ƽ CAUTION
Using other vent or air intake materials, failure
to properly seal all seams and joints or failure
to
follow vent pipe manufacturer’s
instructions can result in personal injury,
death, or property damage. Mixing of venting
materials will void the warranty and
certification of the pool heater.
NOTICE
The use of double-wall vent material for the
combustion air inlet pipe is recommended
when the pool heater is operated in cold
climates to prevent the condensation of
airborne moisture in the incoming
combustion air.
Vent kits
The DirectAire Vertical Vent kit for sidewall or rooftop air inlet
must be ordered from the pool heater manufacturer for single
unit installations. The part number for each kit is listed by unit
size. Each kit includes the flue outlet adapter, air inlet collar and
in sidewall air kits, a sidewall combustion air inlet cap to supply
air to a single pool heater. Each kit includes instructions for
proper installation. The flue pipe, rooftop vent cap for the flue,
vertical air inlet cap, and air inlet pipe are purchased locally. The
air inlet cap for the combined air supply from multiple units
must be purchased locally.