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6.4 Draining the Water Running a low volume of water through the <br /> water heater to prevent freezing: <br /> If the temperature exceeds the ability of the water <br /> Heater heater to freeze protect itself, or if power is lost, <br /> the following steps may prevent the water heater <br /> and external piping from freezing. Units connected <br /> A WARNING with EZConnectTM (2-unit link) should be drained <br /> to prevent freezing if not in use. <br /> To avoid burns, wait until the equipment <br /> cools down before draining the water. The 1. Turn the water heater off and <br /> water in the appliance will remain hot after it close the gas supply valve. <br /> is turned off. <br /> 2. Turn on a hot water tap to flow <br /> If the water heater is not going to be used water about 0.1 gal/min (0.4 <br /> ti4 <br /> during a period of possible freezing weather, it L/min) or where the stream isabout 0.2 in. (5 mm)thick. <br /> is recommended that the water inside the water Figure 83 <br /> heater be drained. When the water heater or external piping i in has <br /> To manually drain the water: frozen: <br /> 1. Shut off cold water supply and gas supply. 1. Do not operate the water heater if it or the <br /> external piping is frozen. <br /> 2. Turn off the temperature controller. <br /> 2. Close the gas and water valves and turn off <br /> 3. Disconnect the power to the water heater. the power. <br /> 4. Close the hot and cold isolation valves. 3. Wait until the water thaws. Check by opening <br /> 5. Open the pressure relief valve (PRV) lever. the water supply valve. <br /> 6. Open the hot and cold drain valves. 4. Check the water heater and the piping for <br /> leaks. <br /> 7. Remove the condensate trap drain plug and <br /> allow to drain. Condensate Hot Drain <br /> 8. Remove the pump drain plug (only for pump Trap Drain Plug Valve <br /> version). <br /> 0 O C <br /> To resume normal operation: <br /> 1. Confirm that the gas supply is turned off, all <br /> taps are closed and PRV lever is closed. PRV Lever <br /> 2. Insert the condensate trap drain plug. Cold Drain <br /> Valve <br /> 3. Close the hot and cold drain valves. <br /> n Cold Isolation <br /> 4. Open the cold and hot water isolation valves. 0 Valve <br /> a <br /> 5. Open a tap and confirm that water flows, and Hot Isolation <br /> then close. • Valve <br /> rt • <br /> �D <br /> 6. Connect power to the water heater. <br /> 7. After confirming that the temperature controller <br /> is off, turn on the gas supply. Figure 84:Piping Diagram <br /> 8. Turn on the temperature controller. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 85 <br />