50
Plumbing
INSTALLATION INSTRUCTIONS
Water Supply (cont.)
Relief Valve
A new pressure-relief valve, complying with the
Standard for Relief Valves and Automatic Gas Shut-Off
Devices for Hot Water Supply Systems, ANSI Z21.22/
CSA 4.4, must be installed at the HOT water outlet
connection of the water heater during installation.
Local codes shall govern the installation of any
relief valves or place of purchase for availability and
installation information.
NOTICES:
• The following drawing illustrates a pressure-only
relief valve. If local codes require a combination
temperature and pressure-relief valve, you may need
to install an extension piece to ensure that the valve
probe is not directly in the flow path of the water.
•
A pressure relief valve supplied with this water heater
must be installed as shown below.
• Manual operation of relief valves should be
performed at least once a year.
• I f the relief valve on the system discharges
periodically, a problem exists. Turn off the water
heater, unplug the unit, and call for service.
One end of the relief valve discharge line connects to
the HOT water outlet pipe as shown above. The other
end of the pipe should be routed to a suitable drain to
eliminate potential water damage.
For safe operation of the water heater, be sure that:
• The pressure rating of the relief valve must not
exceed 150 psi (1,034 kPa) or the maximum working
pressure of the water heater. (See the rating plate on
the water heater.)
• The BTUH rating of the relief valve must equal or
exceed the BTUH input of the water heater. (See the
rating plate on the water heater.)
• N o valve of any type should be installed between the
relief valve and the water heater.
• Discharge from the relief valve should be piped to
a suitable drain. Piping used should be of a type
approved for the distribution of hot water.
• HOT and COLD water lines should be insulated up to
the water heater. See page 51.
• The discharge line must be NO SMALLER than the
outlet of the relief valve. The drain line must pitch
downward to allow for complete drainage of the line
and the valve.
• The end of the discharge line should not be threaded
or concealed and should be protected from freezing.
No valve of any type, restriction, or reducer coupling
should be installed in the discharge line.
Relief
Valve
Union
Union
Cold Water Supply
Shut-Off Valve
Cold Water
Supply Inlet
Hot Water
Supply Outlet
Relief Valve
Discharge Line
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