Installation Guide

16 • Residen al Gas Water Heater Use and Care Guide for Manufactured Homes
INSTALLATION
INSTALLATION
Temperature
and Pressure
Relief Valve
Discharge Pipe
Figure 19: Temperature and Pressure Relief
Valve Pipe
• 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 distor on. Use
only copper or CPVC pipe. Do not
use any other type of pipe, such
as PVC, iron, fl exible plas c pipe,
or any type of hose.
• Terminate the discharge pipe a
maximum of six inches above
a fl oor drain or through the
structural fl oor to the outside.
Do not drain the discharge pipe
into the drain pan; instead pipe it
separately to an adequate drain
or outside the building. 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.
• Do not place any valve or other
restric on 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 discharge pipe. Do
not insert or install any reducer in
the discharge pipe.
2
Install the foam insulator
(supplied) on the T&P Relief
Valve body. Locate the slit
running the length of the insulator.
Spread the slit open and fi t the
insula on over the T&P Relief Valve
body. Apply gentle pressure to the
insula on to ensure that it is fully
seated on the T&P Relief Valve. Once
seated, secure the insula on with
tape. Make sure that the insula on
and tape:
• Do not block or cover the T&P
Relief Valve drain opening.
• Do not block or hinder access to
the manual lever on the valve.
• Do not interfere with the T&P
Relief Valve’s opera on.
Step 8:
Install Shutoff and
Thermosta c Mixing
Valves
1
If one is not already installed,
install a manual shutoff valve
in the cold water line that
supplies the water heater. Install the
shutoff valve near the water heater so
that it is readily accessible. Only use a
full-fl ow ball or gate valve compa ble
with potable water.
2
Install a Thermosta c Mixing
Valve at each point-of-use
(for example, kitchen sink,
bathroom sink, bath, shower) per the
valve manufacturer’s instruc ons.
Figure 20: 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
rela vely low temperature, hot water
can scald. Install Thermosta c Mixing
Valves at each point-of-use to reduce
the risk of scalding.
3
For water heaters that are fed
by a solar water hea ng
system (or any other pre-
hea ng system), always install a
Thermosta c Mixing Valve or other
temperature limi ng device in the
inlet water supply line to limit water
supply inlet temperature to 120°F.
Solar water hea ng systems can
supply water with temperatures
exceeding 180°F and may result in
water heater malfunc on.
WARNING! Hot water provided by
solar hea ng systems can cause
severe burns instantly, resul ng in
severe injury or death.
Step 9:
Connect the Water
Supply
Note that all piping and components
connected to the water heater must
be suitable for use with potable water.
1
Determine the type of water
pipes in your home. Most
homes use copper water
pipes, but some use CPVC or cross-
linked polyethylene (PEX). Use fi  ngs
appropriate for the type of pipe in your
home. Do not use iron or PVC pipe.
2
Connect the cold water
supply using 3/4 inch
Na onal Pipe Thread “NPT” to the
fi  ng marked “C” (COLD).