19
Venting continued-
Venting
The venting instructions must be followed to avoid restricted combustion or recirculation of flue gases. Such
conditions cause sooting or risks of fire and asphyxiation.
This water heater can be installed as either a direct vent system or power vent (air from inside) system. If it is installed
as a direct vent system, then the air intake and the exhaust vent are piped to the outside. If a power vented system is
used, then air is drawn from inside and only the exhaust is piped to the outside. Determine which system is best for
your application and install as described in the following sections.
Direct Vent Installation
Venting may be run horizontally through an outside wall or vertically through a roof through using either 2 in
(5.1 cm),
3 in
(7.6 cm)
, 4 in
(10.2 cm), or 6 in (15.2 cm)
diameter pipe. This water heater is supplied with a screened intake
elbow and exhaust coupling referred to as the air intake terminal and the exhaust vent terminal.
Direct Vent Terminal Location
Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. Before the vent is
installed, determine the vent pipe termination location as shown in Figure 11.
CAUTION
All intake and exhaust venting components
must
have the same diameter size.
DO NOT
use a different size on the intake and
exhaust venting. For 2 in
(5.1 cm)
or 4 in
(10.2 cm)
venting, use the supplied 3 in
(7.6 cm)
vent terminals. If a 2 in
(5.1 cm)
vent terminal is preferred, use 2 in
(5.1 cm)
terminal (p/n 239-39831-00). This terminal is available from your supplier.
Be sure the condensate runs freely to a drain and does
NOT
accumulate inside the water heater. In cold climates, precautions
may need to be taken to ensure that the condensate drain does not freeze. Make sure the condensate trap or drain loop is
installed to prevent flue gases from being discharged into the room.
High levels of dust and debris such as road and construction dust, insects, and tree pollen may clog the burner resulting in
poor performance and damage to the water heater. Avoid air intake locations where debris can be created such as exhaust
ventilation hoods, gravel parking lots, and near outdoor spotlights that attract bugs. For these installations, an air intake filter kit
(p/n 239-47330-00) is available as an accessory service part from the installer of this water heater. The air intake filter kit is
NOT
designed to filter out airborne contaminants or chemicals that may damage the water heater.
CAUTION
The vent shall terminate a minimum of 12 in
(30 cm)
above expected snowfall level to prevent blockage of vent
termination.
The horizontal centerline of the exhaust vent terminal (if applicable)
must NOT
be located lower than the horizontal
centerline of the air intake terminal if vented through the same wall.
A service drain loop must be installed in the drain tubing to serve as a condensate trap to prevent flue gases from
escaping into the room.
DO NOT position the air intake above the exhaust terminal.
NEVER
locate the air intake where exhaust gases can be introduced.
WARNING
The 100T250 and 100T300 models are
NOT
approved for 2 in diameter vent pipe. Venting with 2 in pipe on these models
may result in damage to the water heater or cause an unsafe condition.
DO NOT
use 2 in vent or air intake pipe on
100T250/300 models.
NOTICE
The air intake and exhaust terminals may be located on separate outside walls or one terminal may exit the roof
while the other is through the wall. The total combined equivalent vent length must be within the limits specified in
the venting tables and the intake length cannot exceed the exhaust by more than 30 ft. The minimum
recommended vent separation distance between the intake and exhaust terminals is 36 in. Local conditions may
require a need for greater vent separation distances.
Summary of Contents for 100T199
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