Completed Installation Typical - A.O. Smith GCV300 Service Handbook

COMPLETED INSTALLATION TYPICAL

See Labels and
Installation Instructions
and Use & Care Guide
for clearances.
To Fixtures - Hot
Tempered Water
To Fixtures
Untempered
Hot Water
Hot
Water
Outlet
Mixing Valve
(Set to 120°F)
Follow the Mixing
Valve Manufacturer's
Instructions
Union
Sediment Trap
3" Minimum.
Base Ring Filter:
Air is drawn in for combustion. Keep area clean
and free from flammables and flammable vapors.
The water heater 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)- current edition.
* NOTE: If on a well system, the expansion tank should be set to the maximum pressure of the pump tank.
6 • Residential Standard Gas Water Heater Service Handbook 6 • Residential Standard Gas Water Heater Service Handbook
Exhaust Vent to
Ouside of Building
Union
Gas Supply
Cold
Water
Inlet
Water
Shut-Off
Valve
Union
Temperature-Pressure Relief Valve
with discharge piped to an
adequate drain. Do not cap or plug.
Manual Gas
Shut-off Valve
Metal Drain Pan piped to an adequate drain.
NOTE: Drain pan diameter must be at least
2 inches wider than the diameter of the
water heater.
Figure 1.
Water
Supply- Cold*
*Massachusett: Install
a vacuum relief in cold
water line per section
19 MGL 142.
Expansion Tank
Pressurized to Equal
Supply Water Pressure*
(Relieve water pressure
on the expansion tank
before adjusting air
pressure.)
Gas Control Valve/Thermostat
Recommended setting of 120°F.
Do not cap or plug.
6" Maximum Air Gap
NOTE: Local codes
may vary.
Drain