Water Line Connections; Closed Water Systems; Thermal Expansion - State Water Heaters SSED 5 Instruction Manual

For safe operation of the water heater, the Temperature-Pressure
Relief valve must not be removed from its designated opening
nor plugged. The Temperature-Pressure Relief valve must be
installed directly into the fitting of the water heater designed for the
Temperature-Pressure Relief valve. Install discharge piping so that it
will terminate a maximum of six inches (15.2 cm) above a floor drain
or external to the building. In cold climates, it is recommended that
the discharge pipe be terminated at an adequate drain inside the
building. Be certain that no contact is made with any live electrical
part. The discharge opening must not be blocked or reduced in size
under any circumstances. Excessive length, over 30 feet (9.14 m),
or use of more than four elbows can cause restriction and reduce the
discharge capacity of the Temperature-Pressure Relief valve.
No valve or other obstruction is to be placed between the
Temperature-Pressure Relief valve and the tank. Do not connect
discharge piping directly to the drain unless a 6" (15.2 cm) air gap is
provided. To prevent bodily injury, hazard to life, or property damage,
the Temperature-Pressure Relief valve must be allowed to discharge
water in adequate quantities should circumstances demand. If the
discharge pipe is not connected to a drain or other suitable means,
the water flow may cause property damage.
CAUTION
Water Damage Hazard
•
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
t&p Valve discharge pipe requirements:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both the
Temperature-Pressure Relief valve and the discharge pipe.
• Must terminate a maximum of six inches above a floor drain or external
to the building. In cold climates, it is recommended that the discharge
pipe be terminated at an adequate drain inside the building.
• Shall not have any valve or other obstruction between the relief
valve and the drain.
DANGER
The Temperature-Pressure Relief valve must be manually
operated at least twice a year. Caution should be taken to
•
Burn hazard.
•
Hot water discharge.
•
Keep clear of Temperature
Pressure Relief Valve
discharge outlet.
ensure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief valve discharge line, and (2) the
water manually discharged will not cause any bodily injury or
property damage because the water may be extremely hot. If after
manually operating the Temperature-Pressure Relief valve, it fails
to completely reset and continues to release water, immediately
close the cold water inlet to the water heater, follow the draining
instructions in this manual, and replace the Temperature-
Pressure Relief valve with a properly rated/sized new one.
note: The purpose of a Temperature-Pressure Relief valve is to
prevent excessive temperatures and pressures in the storage tank. The
T&P valve is not intended for the constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on all closed
systems to control thermal expansion, see Closed Water Systems and
Thermal Expansion on page 9.
If you do not understand these instructions or have any questions
regarding the Temperature-Pressure Relief valve call the toll
free number listed on the back cover of this manual for technical
assistance.

Water lIne connectIons

This manual provides detailed piping installation diagrams (see back
section of this manual) for typical methods of application. For the heater
inlet and outlet connections, di-electric unions are recommended. The
water heater may be installed by itself, or with a separate storage
tank, on both single and two-temperature systems. When used with
a separate storage tank, the circulation may be either by gravity or by
means of a circulating pump. When a circulating pump is used it is
important to note that the flow rate should be slow so that there will be
a minimum of turbulence inside the water heater.

closed Water systeMs

Water supply systems may, because of code requirements or such
conditions as high line pressure, among others, have installed devices
such as pressure reducing valves, check valves, and back flow
preventers. Devices such as these cause the water system to be a
closed system.

therMal eXpansIon

As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows 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 Temperature-Pressure Relief valve due
to excessive pressure build up. This condition is not covered under
the limited warranty. The Temperature-Pressure Relief valve is not
intended for the constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on all
closed systems to control the harmful effects of thermal expansion.
Contact a local plumbing service agency to have a thermal
expansion tank installed.
9