Sediment Traps; Filling The Water Heater; Venting; Vent Pipe Termination - A.O. Smith GPS-75 Instruction Manual

sedIMent traps

A sediment trap should be installed as close to the inlet of the water
heater as practical at the time of water heater installation. The
sediment trap should be either a tee fitting with a capped nipple in
the bottom outlet or other device recognized as an effective sediment
trap. If a tee fitting is used, it should be installed in conformance with
one of the methods of installation shown in Figures 11 and 12.
Contaminants in the gas lines may cause improper operation of
the gas control valve that may result in fire or explosion. Before
attaching the gas line be sure that all gas pipe is clean on the inside.
To trap any dirt or foreign material in the gas supply line, a drip leg
(sometimes called a sediment trap) must be incorporated 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).
fIGure 13.

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 filled with water. Water
must flow from the hot water faucet before turning "ON" gas to the
water heater.
To fill 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 filling of the tank, allow air to exit by opening the
nearest hot water faucet. Allow water to run until a constant flow 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

vent pIpe terMInatIon

The first step is to determine where the vent pipe will terminate, see
Figures 14, 18 and 19. The vent may terminate through the roof as
shown in Figure 19 or through a sidewall as shown in Figure 18.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
National Fuel Gas Code, ANSI Z223.1.
For your convenience instructions on proper installation through a
sidewall are provided in Figure 15 and the numbered points below:
1. The exit terminals of a mechanical vent system should be not less than
7 feet above grade when located adjacent to public walkways.
15
IMportant