Basic Installation - A.O. Smith GCV Series Service Handbook

INSTALLATION OF RESIDENTIAL GAS WATER HEATER
See Labels and
Installation Instructions
and Use & Care Guide
for clearances.
To Fixtures - Hot
Tempered Water
To Fixtures
Untempered
Cold
Hot Water
Water
Inlet
Hot
Water
Outlet
Mixing Valve
(Set to 120°F)
Follow the Mixing
Valve Manufacturer's
Instructions
Union
Sediment Trap
(Drip Leg) 3" Minimum.
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.
** White-Rodgers® gas control valve/thermostat shown in this figure. The valve may vary according to model and year.
BASIC INSTALLATION & OPERATION
Exhaust Vent to
Ouside of Building
Union
Union
Gas Supply
Figure 1
Water
Shut-Off
Valve
Temperature-Pressure Relief Valve
with discharge piped to an
adequate drain. Do not cap or plug.
Manual Gas
Shut-off Valve
Gas Control Valve/Thermostat
Recommended setting of 120°F.*
Metal Drain Pan piped to an adequate drai
NOTE: Drain pan diameter must be at leas
2 inches wider than the diameter of the
water heater.
8
Water
Supply- Cold*
*Massachusett: Install
a vacuum relief in cold
water line per section
19 MGL 142.
Expansion Tank
Pressurize to Equal
Supply Water Pressure*
(Relieve water pressure
on the expansion tank
before adjusting air
pressure.)
Do not cap or plug.
6" Maximum Air Gap
NOTE: Local codes
may vary.
Drain