Sediment Traps; Filling The Water Heater; Venting; High Altitude Installations - A.O. Smith GDV Instruction Manual

SEDIMENT TRAPS

A sediment trap shall be installed as close to the inlet of the
water heater as practical at the time of water heater installation.
The sediment trap shall be either a tee fi tting with a capped
nipple in the bottom outlet or other device recognized as an ef-
fective sediment trap. If a tee fi tting is used, it shall be installed
in conformance with one of the methods of installation shown in
Figures 8 and 9.
Contaminants in the gas lines may cause improper operation of
the gas control valve that may result in fi re or explosion. Before
attaching the gas line be sure that all gas pipe is clean on the in-
side. To trap any dirt or foreign material in the gas supply line, a
drip leg (sometimes called a sediment trap) must be incorporat-
ed in the piping. The drip leg must be readily accessible. Install
in accordance with the "Gas Piping" section. Refer to the current
edition of the National Fuel Gas Code ANSI Z223.1/NFPA 54.
HOT WATER
OUTLET
UNION
DRAIN VALVE
FLOOR DRAIN
FIGURE 10

FILLING THE WATER HEATER

Never use this water heater unless it is completely full of water.
To prevent damage to the tank, the tank must be fi lled with water.
Water must fl ow from the hot water faucet before turning "ON"
gas to the water heater.
To fi ll the water heater with water:
1. Close the water heater drain valve by turning the handle to
the right (clockwise). The drain valve is on the lower front of
the water heater.
2. Open the cold water supply valve to the water heater.
NOTE: The cold water supply valve must be left open when
the water heater is in use.
3. To insure complete fi lling of the tank, allow air to exit by open-
ing the nearest hot water faucet. Allow water to run until a
constant fl ow is obtained. This will let air out of the water
heater and the piping.
4. Check all water piping and connections for leaks. Repair as
needed.

VENTING

NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO
THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO
COLD WATER
AVOID RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION
INTLET
OR ASPHYXIATION.
SHUTOFF
VALVE
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
UNION
VENTILATING AIR.
TEMPERATURE
AND VENTILATION MUST BE PROVIDED FOR SAFE
AND PRESSURE
OPERATION.
RELIEF VALVE

HIGH ALTITUDE INSTALLATIONS

Installations above 7,700 ft. (2347 m) require replacement of the
burner orifi ce in accordance with the National Fuel Gas Code
DISCHARGE PIPE
(DO NOT CAP
ANSI Z223.1/NFPA 54. Failure to replace the orifi ce could result
OR PLUG)
in improper and ineffi cient operation of the appliance, producing
carbon monoxide gas in excess of safe limits, which could result
in serious personal injury or death. Contact your gas supplier for
any specifi c changes which may be required in your area.
DRAIN PAN
6" MAXIMUM
AIR GAP
14
ADEQUATE AIR FOR COMBUSTION