A.O. Smith FDV Owner's Manual - page 5
5
VENT PIPE TERMINATION
Before installing water heater determine placement of vent pipe
termination.
MAKE CERTAIN TO OBSERVE VENT LOCATION LIMITATION,
SEE FIG'S 3 & 15.
CAUTION
Use only the vent kit assembly supplied with this water heater.
Only supplied kit provides required clearances from combustibles;
both through the wall and the exterior siding. TERMINATION OF A
SIDEWALL VENT SYSTEM WITH A DEVICE OTHER THAN THE
SUPPLIED VENT KIT ASSEMBLY IS NOT RECOMMENDED AND
COULD AFFECT SYSTEM PERFORMANCE AND RESULT IN A
SAFETY HAZARD.
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 7.8c as follows:
1.
The vent terminals of a direct vent system shall be not less
than 7 feet above grade when located adjacent to public
walkways (Fig. 3).
2.
A venting system shall terminate at least 9 inches above any
forced air inlet located within 10 feet (Fig. 3).
3.
The venting system shall terminate at least 9 inches below, 9
inches horizontally from or 9 inches above any door, window
or gravity air inlet into any building.
4.
The manufacturer also recommends the vent terminations not
be installed closer than 3 feet from an inside corner of an L
shaped structure, and not less than 1 foot above grade. The
vent shall terminate a minimum 12" above expected snowfall
level to prevent blockage of vent termination.
5.
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.
Required clearances from combustible materials must be provided
in accordance with information in this manual under LOCATION
OF HEATER and with the National Fuel Gas Code and local codes.
Carefully read through these installation instructions before you
start your installation. The figures provided will give the necessary
views to complete this installation. Self drilling screws are provided,
but it may be necessary to use a 1/8" drill for a starting hole as
called for in the instructions.
NOTE: IN SOME LOCALITIES, LOCAL CODE REQUIRES AN
ADDITIONAL VENT COVER.
NOTE:The four fasteners that are required to secure the vent cap
to the external wall are not provided. These should be screw type
(not nails) chosen for the type of construction and obtained locally.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to thermostat gas inlet. The
thermostat inlet has a pad for use with a backup wrench.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compound to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases. Do not use teflon tape on thermostat fittings.
DISCONNECT THE APPLIANCE FROM THE GAS SUPPLY
PIPING SYSTEM DURING ANY SUPPLY PRESSURE TESTING
EXCEEDING 1/2 PSI (3.5 kPa). GAS SUPPLY LINE MUST BE
CAPPED WHEN DISCONNECTED FROM THE HEATER. FOR
TEST PRESSURES AT 1/2 PSI (3.5 kPa) OR LESS, THE
APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE
ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING
THE MAIN MANUAL GAS VALVE.
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
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 (SEE FIGURE 1). 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 the 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.
NO VALVE IS TO BE PLACED 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.
DO NOT THREAD, PLUG OR
CAP THE END OF THE DRAIN LINE.
VENTING
WARNING
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.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.