Vent Pipe Termination; Vent Terminal Installation - A.O. Smith FPSH Owner's Manual

BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR
OTHER MATERIAL ACCEPTABLE FOR THIS PURPOSE. DO
NOT USE MATCHES CANDLES, FLAME OR OTHER SOURCES
OF IGNITION TO LOCATE GAS LEAKS.
RELIEF VALVE (P)-FIG. 1
A NEW TEMPERATURE AND PRESSURE RELIEF VALVE
COMPLYING WITH THE STANDARD FOR RELIEF VALVES AND
AUTOMATIC GAS SHUT OFF DEVICES FOR HOT WATER
SUPPLY SYSTEMS, ANSI Z21.22 (LATEST EDITION) MUST BE
INSTALLED IN THE HEATER IN THE MARKED OPENING
PROVIDED. THE VALVE MUST BE OF A SIZE (INPUT RATING)
THAT WILL BE ADEQUATE FOR YOUR SIZE HEATER.
Check the metal tag on the relief valve and compare it to the
heater's rating plate. The pressure rating of relief valve must not
exceed the working pressure shown on the rating plate of the
heater. In addition the hourly Btu rated temperature steam
discharge capacity of the relief valve shall not be less than the
input rating of the heater.
BETWEEN THE RELIEF VALVE AND TANK. DO NOT PLUG
THE RELIEF VALVE.
The drain line connected to this valve must not contain a reducing
coupling or other restriction and must terminate near a suitable
drain to prevent water damage during valve operation. The
discharge line shall be installed in a manner to allow complete
drainage of both the valve and line.
OR CAP THE END OF THE DRAIN LINE.
VENTING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO
THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID
RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR
ASPHYXIATION.

VENT PIPE TERMINATION

NOTE: Before installing power venter determine place of vent
pipe termination. See figure3 on page 7.
IMPORTANT
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the latest edition of the
National Fuel Gas Code, ANSI Z223.1, 7.3.4e and 7.8a,b, as
follows:
1. The exit terminals of a mechanical vent system shall be not
less than 7 feet above grade when located adjacent to public
walkways. (Figure. 3)
2. A venting system shall terminate at least 3 feet above any
forced air inlet located within 10 feet. (Figure 3)
NO VALVE IS TO BE PLACED
DO NOT THREAD, PLUG
WARNING
3. The venting system shall terminate at least 4 feet below, 4 feet
horizontally from or, 1 foot above any door, window or gravity
air inlet into any building.
The manufacturer also recommends that the vent termination
should not be installed closer than 3 feet from an inside corner
of an L shaped structure and not be less than 1 foot above
grade.
The vent shall terminate a minimum of 12'' above expected
snowfall level to prevent blockage of vent termination.
4. In cold climates, it is recommended that vent termination not
be mounted directly above or within 3 feet horizontally from an
oil tank vent or gas meter to avoid potential freeze-up from
condensation.
Plan the vent system layout so that proper clearances are
maintained from plumbing and wiring.
Vent pipes serving power vented appliances are classified by
building codes as "vent connectors". Required clearances from
combustible materials must be provided in accordance with
information in this manual under LOCATION OF HEATER and
VENT TERMINAL INSTALLATIONS, and with the National Fuel
Gas Code and local codes.
IMPORTANT
Plan the layout of the vent system backwards from the vent
termination to the appliance. Take into consideration that an elbow
may be necessary to make the first vent pipe connection to the
blower outlet.
Use only the vent terminal supplied with this unit. Termination of
a sidewall vent system with a device other than the supplied vent
terminal could affect system performance and result in a safety
hazard.

VENT TERMINAL INSTALLATION

1. After the point of termination has been determined, use the
cover plate as a template to mark the hole for the vent pipe to
insert through the wall.
AND PIPING INSIDE OF WALL.
2. If the Vent Terminal is being installed on the outside of a finished
wall, it may be easier to mark both the inside and outside wall.
Align the holes by drilling a hole through the center of the
template from the inside through to the outside. The template
can now be positioned on the outside wall using the drilled
hole as a centering point for the template.
3. A) MASONRY SIDE WALLS
Chisel an opening approximately one half inch larger than the
marked circle.
B) WOODEN SIDE WALLS
Drill a pilot hole approximately one quarter inch outside of the
marked circle. This pilot hole is used as a starting point for a
saws-all or sabre saw blade. Cut around the marked circle
staying approximately one quarter inch outside of the line.
(This will allow the vent pipe to easily slide through the opening.
The resulting gap will be covered up by the vent terminal
cover plates.) Repeat this step on inside wall if necessary.
6
CAUTION
BEWARE OF CONCEALED WIRING