A.O. Smith G6-PVT4050NV Installation Instructions And Use & Care Manual page 20

INSTALLATION
• The discharge pipe must not be
smaller than the pipe size of the
T&P Relief Valve. The pipe must also
be able to withstand 250°F (121°C)
without distortion. Use only copper
or CPVC pipe. Do not use any other
type of pipe, such as PVC, iron, flexi-
ble plastic pipe, or any type of hose.
Figure 38 - The T&P Relief Valve discharge pipe
must be installed properly and piped to an
adequate drain.
• Terminate the discharge pipe a
maximum of six inches above a
floor drain or outside the building.
Do not drain the discharge pipe
into the drain pan; instead pipe it
separately to an adequate drain.
In cold climates, terminate the
discharge pipe inside the building to
an adequate drain. Outside drains
could freeze and obstruct the drain
line — protect the discharge pipe
from freezing.
Dicharge
Pipe
6.00"
MAX
Figure 39 - Temperature and Pressure Relief
Valve Discharge Pipe
20 • Residential Gas Water Heater Use and Care Guide
• Do not place any valve or other re-
striction between the tank and T&P
Relief Valve. Do not cap, block, plug,
or insert any valve between the T&P
Relief Valve and the end of the dis-
charge pipe. Do not insert or install
any reducer in the discharge pipe.
Drain
Pipe
Step: 6
Install Shut-Off and
Thermostatic Mixing
Valves
If one is not already installed,
1
install a manual shut-off valve
in the cold water line that
supplies the water heater. Install the
shut-off valve near the water heater
so that it is readily accessible. Only
use a full-flow ball or gate valve
compatible with potable water.
Install a Thermostatic Mixing
2
Valve at each point-of-use
(for example, kitchen sink,
bathroom sink, bath, shower) per the
valve manufacturer's instructions.
MIX
Figure 40 - Install Thermostatic Mixing Valves at
each point where hot water will be used.
WARNING! Even if the water
heater's thermostat is set to a
relatively low temperature, hot water
can scald. Install Thermostatic Mixing
Valves at each point-of-use to reduce
the risk scalding.