State Industries SSED 5 Water Line Connections, Closed Water Systems, Thermal Expansion

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.

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

DANGER

•Burn hazard.

•Hot water discharge.

•Keep clear of Temperature Pressure Relief Valve discharge outlet.

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.

The Temperature-Pressure Relief Valve must be manually operated at least twice a year. Caution should be taken to

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.

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