Lochinvar SDT/SET065 - 119 4Domestic Side Tank Piping continued, Anti-scaldValves Mixing Valves

SDT/SET Installation & Operation Manual

4Domestic Side (Tank) Piping (continued)

Anti-scald Valves (Mixing Valves)

Temperature & Pressure (T&P) Relief Valve

Anti-scald valves used with water heaters are also called tempering valves or mixing valves. An anti-scald valve mixes cold water in with the outgoing hot water to assure that hot water reaching a building fixture is at a temperature low enough to be safe. ASSE1017 and ASSE1070 certified valves are recommended.

Usually, the maximum temperature of the outlet water will stay near the setting of the tank control. In some cases, however, hot water usage patterns can cause the outlet water temperature to rise significantly above the control setting.

The temperature of water going to the fixtures may be more carefully controlled through the use of a thermostatic mixing valve. This device blends a controlled amount of cold water with the hot water leaving the tank so that water at a more constant temperature exits the mixing valve. Anti-scald mixing valve piping is illustrated in FIG.’s 3-1 thru 3-4.

￿WARNING

For protection against excessive temperatures and pressure, install temperature and pressure protective equipment required by local codes, but not less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials as meeting the requirements for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22 and the Standard CAN1-4.4, Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves. The combination temperature and pressure relief valve shall be marked with a maximum set pressure not to exceed the maximum working pressure of the water heater. The combination

￿WARNING

An anti-scald mixing valve does not eliminate the risk of scalding.

*Set the tank thermostat as low as practical.

*Feel water before bathing or showering.

*If anti-scald or anti-chill protection is required, use devices specifically designed for such service. Install these devices in accordance with their manufacturer’s instructions.

temperature and pressure relief valve shall also have an hourly rated temperature steam BTU discharge capacity not less than shown in Table 4A, page 14.

Install the combination temperature and pressure relief valve into the opening provided and marked for this purpose on the water heater.

Install Drain Valve

Drain valve and fittings are supplied by others.

Standard Installation

•Install a tee connection at the domestic cold water inlet (FIG. 4-1).

Figure 4-1Drain Valve Installed

DRAIN

VALVE

13