State Industries ASME SSE-5 User Manual

Page 9

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9

For safe operation of the water heater, the temperature and 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 relief valve.

Install discharge piping so that any discharge will exit only within 6

inches (15.2 cm) above, or at any distance below the structural floor.

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 valve.

No valve or other obstruction is to be placed between the 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 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.

The Discharge Pipe:

• 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 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.

• Shall 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.

The temperature-pressure relief valve must be manually operated

at least once a year. Caution should be taken to 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 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.

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.

Once the water heater is installed and filled with water, check

the operation of the temperature-pressure relief valve. Follow the

instructions in the Maintenance section of this manual.

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 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 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 should 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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