Rheem Marathon Point-of-Use Series Use and Care Manual - Page 7

Installation To prevent stress on the relief valve fitting, which may damage the tank, support the drain pipe using metal strapping or similar method to an overhead point. Refer to Figure 3 for typical strapping method. NOTE: Local codes shall govern the installation of relief valves. If the Temperature and Pressure Relief Valve should ever need replacing, use only a valve specified by local codes, but not less than a new combination temperature and pressure relief valve, complying with the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22. The pressure rating of the relief valve must not exceed 150 PSI, the maximum working pressure of the water heater as marked on the rating plate. The BTUH Rating of the relief valve must not be less than the input rating of the water heater as indicated on the rating label located on front of the heater (1 watt = 3.412 BTUH). Metallic Conduit or Metal Sheathed Cable and fittings approved for use as a grounding conductor. BLACK GREEN Main Fuse or Circuit Breaker Panel RED for (240V) or WHITE for (120V) Only 5. DRAIN VALVE - The drain valve is factory installed. If required, to face the drain valve outlet in a different direction, loosen the union hex nut, position drain valve outlet as desired, and retighten union hex nut. Wire Nut Wire Nut NOTE: DO NOT attempt to turn the drain valve without first loosening the union hex nut. Doing so could damage the water heater beyond repair. 6. TO FILL WATER HEATER - Make certain drain valve is completely closed. Open shut-off valve in cold water supply line. Open each hot water faucet slowly to allow air to vent from the water heater and piping. A steady flow of water from the hot water faucet(s) indicates a full water heater. When the water heater is completely filled, close the faucet(s). Check all plumbing work for leaks, and repair as necessary before proceeding with installation. ! WARNING BLACK Water Heater Junction Box RED for (240V) or WHITE for (120V) Only. Figure 5A- Water heater field wiring connections using metallic conduit or metallic sheathed cable approved for use as a grounding conductor and installed with fittings approved for the purpose. Tank MUST BE full of water before power is turned on. Heating elements WlLL BE DAMAGED if energized for even a short time while tank is dry. The water heater's warranty does not cover damage or failure resulting from operation with an empty or partially empty tank. (Reference is made to the limited warranty for complete terms and conditions.) Non - Metallic Sheathed Cable with separate grounding conductor. Main Fuse or Circuit Breaker Panel Junction Box Cover BLACK GREEN Wire Nut Grounding Conductor (Bare or Green) RED (240V) or WHITE for 120V Only. Wire Nut BLACK RED (240V) or WHITE for 120V Only. Figure 4 - Water heater junction box location. Water Heater Junction Box 7. ELECTRICAL CONNECTIONS - The water heater is completely wired to the junction box inside jacket at top front of water heater (see Figure 4). An opening for a l/2" or 3/4" electrical fitting is provided for field wiring connections. A separate branch circuit with copper conductors, overcurrent protective device and suitable disconnecting means must be provided by a Figure 5B- Water heater field wiring connections using nonmetallic sheathed cable and separate grounding conductor. Grounding conductor must be attached to the ground terminal of water heater and the electrical distribution panel. 5