Vent Pipe System
This water heater uses a non-direct, single-pipe vent
system to remove exhaust gases created by the
burning of fossil fuels. Air for combustion is taken from
the immediate water heater location or is ducted in from
the outside (see “Combustion Air Supply and
Ventilation”).
This water heater must be properly vented for the
removal of exhaust gases to the outside atmosphere.
Correct installation of the vent pipe system is
mandatory for the proper and efficient operation of this
water heater and is an important factor in the life of the
unit.
The vent pipe must be installed according to all local
and state codes or, in the absence of local and state
codes, the “National Fuel Gas Code”, ANSI
Z223.1(NFPA 54)-latest edition. The vent pipe
installation must not be obstructed so as to prevent the
removal of exhaust gases to the outside atmosphere.
U.L. recognized fuel gas and carbon monoxide (CO)
detectors are recommended in all applications and
should be installed using the manufacturer’s
instructions and local codes, rules, or regulations.
Important: If you lack the necessary skills required to
properly install this venting system, you should not
proceed, but get help from a qualified service
technician.
Drafthood Installation
Align the legs of the drafthood with the slots provided.
Insert the legs and secure the drafthood to the water
heater's top with the four screws provided as shown in
Figure 9. Do not alter the drafthood in any way. If you
are replacing an existing water heater, be sure to use
the new drafthood supplied with the water heater.
Figure 9
Drafthood Installation
Sheet Metal Screws (four provided)
Drafthood
Jacket top
Install the drafthood with
the four screws provided.
Vent Pipe Size
It is important that you follow the guidelines in these
instructions for sizing a vent pipe system. If a transition
to a larger vent size is required, the vent transition
connection must be made at the drafthood outlet.
Vent Connectors
1. Type B, Doublewall, U.L. Listed Vent Pipe.
2. Singlewall Vent Pipe.
Maintain the manufacturer’s specified minimum
clearance from combustible materials when using type
B doublewall vent pipe.
Vent connectors made of type B, doublewall vent pipe
material may pass through walls or partitions
constructed of combustible material, if the minimum
listed clearance is maintained.
Maintain a six inch minimum clearance from all
combustible materials when using singlewall vent pipe.
Important: Singlewall vent pipe cannot be used for
water heaters located in attics and may not pass
through attic spaces, crawl spaces or any confined or
inaccessible location. A singlewall metal vent connector
cannot pass through any interior wall.
When installing a vent connector, please note the
following:
!Install the vent connector avoiding unnecessary
bends, which create resistance to the flow of vent
gases.
!Install without dips or sags with an upward slope of
at least 1/4-inch per foot.
!Joints must be fastened by sheet metal screws or
other approved means. It must be supported to
maintain clearances and prevent separation of
joints and damage.
!The length of the vent connector cannot exceed
75% of the vertical vent height.
!The vent connector must be accessible for
cleaning, inspection, and replacement.
!Vent connectors cannot pass through any ceiling,
floor, firewall, or fire partition.
Important: Existing vent systems must be inspected for
obstructions, corrosion, and proper installation.
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