Water Piping Pressure Test; Closed System/Thermal Expansion; Temperature And Pressure Relief Valve - Kenmore 153.336930 Use & Care Manual

Water Piping Pressure Test

WARNING
If the water piping system is to be air pressure tested, the
water heater must be disconnected from the water piping
system. Failure to disconnect the water heater during air
pressure testing of the water piping system could result in
DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE.
This section is only for the manufacturer installing the water
heater when the installation is to comply with H.U.D. Standards.
When testing the water ways, H.U.D. standards state: "Water
distribution system. All water piping in the water distribution
system shall be subjected to a pressure test. The test shall be
made by subjecting the system to air or water at 100 psi for 15
minutes without loss of pressure. When air pressure is used,
the water heater shall not be connected during the test."
AIR PRESSURE TESTING
HOT WATER
OUTLET
FIGURE 19.

Closed System/Thermal Expansion

As water is heated, it expands (thermal expansion). In a closed
system, the volume of water will increase. As the volume of water
increases, there will be a corresponding increase in water pressure
due to thermal expansion. Thermal expansion can cause premature
tank failure (leakage). This type of failure is not covered under the
limited warranty. Thermal expansion can also cause intermittent
temperature-pressure relief valve operation: water discharged from
the valve due to excessive pressure build up. The temperature-
pressure relief valve is not intended for the constant relief of thermal
expansion. This condition is not covered under the limited warranty.
A properly sized thermal expansion tank should be installed
on all closed systems to control the harmful effects of thermal
expansion. Thermal expansion tanks are available from Sears
stores and through the Sears Service Centers. Contact the
local plumbing inspector, water supplier and/or the Sears
Service Center for assistance in controlling these situations.
(For additional information, see the Troubleshooting Guide later
in this manual.)
WHEN AIR TESTING,
REMOVE THE WATER
LINES FROM THE WATER
HEATER.
COLD WATER
INLET

Temperature and Pressure Relief Valve

1" MINIMUM
METAL
DRAIN PAN
For protection against excessive pressures and temperatures,
a temperature and pressure relief valve must be installed in the
opening marked "T & P RELIEF VALVE." (See Figure 20). This
valve must be design certified by a nationally recognized testing
laboratory that maintains periodic inspection of the production
of listed equipment or materials as meeting the requirements
for Relief Valves for Hot Water Supply Systems, ANSI Z21.22.
The function of the temperature and pressure relief valve is to
discharge water in large quantities in the event of excessive
temperature or pressure developing in the water heater. The
valve's relief pressure must not exceed the working pressure of
the water heater as stated on the rating plate.
IMPORTANT: Only a new temperature and pressure relief valve
should be used with your water heater. Do not use an old or
existing valve as it may be damaged or not adequate for the
working pressure of the new water heater. Do not place any
valve between the relief valve and the tank.
The Temperature & Pressure Relief Valve:
• Must not be in contact with any electrical part.
• Must be connected to an adequate discharge line.
• Must not be rated higher than the working pressure shown
on the rating plate of the water heater.
The Discharge Line:
• Must not be smaller than the pipe size of the relief valve or
have any reducing coupling installed in the discharge line.
• Must not be capped, blocked, plugged or contain any valve
between the relief valve and the end of the discharge line.
• Must pass through the structural floor and terminate
external to the building. In cold climates, it is recommended
that the discharge pipe be terminated at an adequate drain
inside the building.
22
Explosion Hazard
TEMPERATURE AND PRESSURE (T&P)
RELIEF VALVE (OPTIONAL TOP T&P
RELIEF VALVE NOT SHOWN)
DISCHARGE PIPE
(DO NOT CAP OR PLUG)
PAN DRAIN LINE
3/4" ID
MINIMUM
DRAIN LINE TERMINATES
EXTERNAL TO BUILDING
FIGURE 20.
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