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49
INSTALLATION INSTRUCTIONS
Plumbing
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.
NOTICE:
• 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 relief valve probe is
not directly in the flow path of the water.
• Local codes govern the installation of relief valves. If
local codes require that a temperature and pressure-
relief valve be installed, the manufacturer recommends
a type 40XL Watts temperature and pressure-relief
valve or equivalent model be used.
• Manual operation of relief valves should be performed
at least once a year.
• If 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.)
No 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 50.
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.
Cold Water Supply
Shut-Off Valve
Union
Union
Service
Valve
Service
Valve
Relief
Valve
Cold Water
Supply Inlet
Hot Water
Supply Outlet
Relief Valve
Discharge Line
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