American Water Heater HPE10260H045DV manual Temperature and Pressure Relief Valve, Discharge Line

Temperature and Pressure Relief Valve

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tubing so that any discharge from the valve exits only within 6 in. (152mm) above drain, or at any distance below, the structural floor, and does not contact any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstance.

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:

•Shall not be in contact with any electrical part.

•Shall be connected to an adequate discharge line.

•Shall not be rated higher than the working pres- sure shown on the data plate of the water heater.

Figure 3

Temperature and Pressure

Relief Valve Installation

Temperature and

Pressure Relief Valve

Discharge Pipe

(Do Not Plug or Cap)

Drain Pan

2 1/2” (63.5mm) Depth Maximum and 2” (51mm) wider than the water heater.

Drain Line 3/4” (19mm)	Drain
ID Minimum

6” (152mm)

Maximum

Air Gap

The Discharge Line:

•Shall not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line.

•Shall not be capped, blocked, plugged or contain any valve between the relief valve and the end of the discharge line.

•Shall terminate a maximum of 6 in. (152mm) 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 build- ing.

•Shall be of material listed for hot water distribution.

•Shall be installed to allow complete drainage of both the valve and discharge line.

Closed System/Thermal Expansion

As water is heated, it expands (thermal expansion). In a closed system, the volume of water will grow. As the volume of water grows, there will be a corresponding increase in water pressure due to thermal expansion.

For protection against excessive pressures and temperatures, a temperature and pressure relief valve must be installed in the opening marked “T & P RELIEF VALVE” (Figure 3).

To reduce the risk of excessive pressures and temperatures in this water heater, install temperature and pressure relief protective equipment required by local codes, but no less than a combination temperature and pressure relief valve 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 and Automatic Shutoff Devices for Hot Water

Supply Systems, ANSI Z21.22 - latest edition. This valve must

be marked with the maximum set pressure not to exceed the marked maximum working pressure of the water heater. Install the valve into an opening provided and marked for this purpose in the water heater, and orient it or provide

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 discharge from the valve due to excessive pressure build up. The temperature pressure relief 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. Contact a plumbing service agency or your retail supplier reguarding the installation of a thermal expansion tank.

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