Rheem 95 Direct Vent Indoor Series Use and Care Manual - Page 17

Relief Valve Drain Valve shown on right without tubing. Pressure Relief Valve Drain Valve Union Relief Valve Discharge Line Water Shutoff Valve Hot Water Supply Outlet Drain Tube to suitable drain Cold Water Supply Inlet Notice: The above illustrates a pressure-­only relief valve. If local codes require a combination temperature and pressure relief valve be installed, an extension piece may be needed to ensure that the valve probe is not directly in the flow path of the water. A new pressure relief valve, complying with the Standard for Relief Valves and Automatic Gas Shut-­Off Devices for Hot Water Supply Systems, ANSI Z21.22/ CSA 4.4, must be installed at the hot water outlet connection of the water heater at the time of installation. Local codes shall govern the installation of relief valves. For safe operation of the water heater, be sure that: G T he pressure rating of the relief valve must not exceed 150 psi (1034 kPa), the maximum working pressure of the water heater as marked on the rating plate. G T he BTUH rating of the relief valve must equal or exceed the BTUH input of the water heater as marked on its rating plate. G N o valve of any type should be installed between the relief valve and the water heater G D ischarge from the relief valve should be piped to a suitable drain to eliminate potential water damage. Piping used should be of a type approved for the distribution of hot water. G H ot and cold water lines should be insulated up to the water heater. Refer to page 23 for details. G T he discharge line must be NO SMALLER than the outlet of the relief valve and must pitch downward to allow complete drainage (by gravity) of the relief valve and discharge line. G T he end of the discharge line should not be threaded or concealed and should be protected from freezing. No valve of any type, restriction or reducer coupling should be installed in the discharge line. Notice: Local codes govern the installation of relief valves. If local codes require that a temperature and pressure relief valve should be installed, the manufacturer recommends a type 40XL Watts T&P relief valve or an equivalent model be used. Notice: Manual operation of relief valves should be performed at least once a year. Turn off the electrical power and gas shutoff valve. Lift and release lever on the relief valve and check the manual operation of the relief valve. You should take precaution to avoid contact with the hot water coming out of the relief valve and to prevent water damage. Notice: If the relief valve on the system discharges periodically, a problem exists and service to the water system is required. The vinyl tubing as shown is supplied and connects to the drain valve located at the hot water outlet as shown in the diagram at left. Route the other end of the vinyl tubing to the drain pan or a suitable drain where leakage from the heater will not result in damage to the area adjacent to the heater or to lower floors of the structure. AP15317 (10_09) DV Gas Manual 10 30 09.indd 17 17 11/9/2009 3:10:28 PM