DUNKIRK H2OIG50DK – 50 GALLON GLASS LINED

• Easy To Install • Low Pressure Drop • Magnesium Anode Rod Corrosion Protection • Enameled Coated Steel Tank and Coil • Minimal Standby Losses • Flexible Scratch Resistant Jacket • Aquastat Sensor Well • Temperature Pressure Relief Valve • Residential Limited Warranty: Tank, 8-years; Parts, 5-years • Commercial Limited Warranty: Tank, 5-years; Parts, 2-years

When installing or during the normal operation of this water heater, basic safety precautions, to reduce the risk of fire, electric shock, or injury, should be followed. Such precautions include but not limited to the following. • Read all instructions of the water heater, hot water boiler, and all components in the heating system. • Install or locate this water heater in accordance with the provided installation instructions. • Use this water heater for its intended use as described in this manual. • As with any appliance, close supervision is necessary when used by children. • Do not operate this water heater if it is not working properly or if it has been damaged or dropped. • This water heater should only be serviced by qualified personnel. Contact nearest authorized service facility for examination, repair, or adjustment. Maximum boiler water supply temperature to the indirect heat exchanger shall not exceed 240 °F (115 °C). Manufacturer recommends use of water softening system in areas with hard water. Where water quality is unknown, consult a qualified water treatment expert. Improper water quality will reduce the life of the water heater. Avoid hard water, sediment, high or low PH and high levels of chlorides in the domestic water. Verify PH levels fall between 6 and 8, and dissolved chlorides are less than 100 ppm. Use of a filter is required where sediment is greater than 5 microns in size in the water supplied to the unit.

• Shut-off valves: Allows isolation of the water heater from boiler system during service. • Dielectric Unions: Field supplied dielectric unions are required and designed to be installed between pipe made from dissimilar metals to prevent accelerated corrosion and deterioration in the piping system due to stray current discharges. • Vacuum Breaker: Protects the water heater from collapse if a hot tank is shut off to service other components in the system. Required for Commonwealth of Massachusetts. • Thermal Expansion Tank: If the water heater is installed in a closed water supply system, such as a system having a back flow preventer in the cold water supply line, installation of a thermal expansion tank is required. • Water Hammer Arrester: Dishwashers, clothes washers, and fast-closing positive shutoff valves incorporated in the system all contribute to creating water hammer. Install a water hammer arrester to prevent damage to pipes and appliances. See water hammer arrester manufacturer’s instructions for application and installation. • Backflow Preventer: Protects potable water supplies from contamination due to backflow. Requirements for Commonwealth of Massachusetts. Boiler installation shall conform to the Commonwealth of Massachusetts code 248 CMR which includes but is not limited to: Installation by licensed plumber or gas fitter.

• Shut off the cold water supply at the main shutoff valve. • Open one or more faucets to relieve the pressure. Open the system drain, leave faucets open. • Drain the domestic water system. • Install piping and fittings, connecting the tank cold water inlet and cold water supply of the residence, using a dielectric union, heat trap, shut-off valve, vacuum breaker, expansion tank (where required), and filter (manufacturer recommended to prevent sediment buildup). • Connect the tank DHW hot water supply piping. Install piping to hot DHW hot water supply connection using a dielectric union, heat trap, vacuum breaker, and shut-off valve. • Install Pressure Temperature Relief Valve. Pipe the relief valve discharge so the discharge from the valve exits only within 6 inches above, or at any distance below, the structural floor. Any discharged water for the indirect water heater shall not contact any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances. DO NOT install any valve between the tank and Pressure Temperature Relief Valve. • The Pressure and Temperature Relief Valve shall be installed a maximum of 8” away from the tank on the DHW Outlet connection. Placing Pressure Temperature Relief Valve to close to the tank during installation could cause damage to the tank due to soldering. See Figure 3. • Fill the water heater tank. Open all faucets to allow air to purge from the tank and piping. Remove screens on faucets. Open domestic hot water shut-off valve. Open cold water inlet shut-off valve. Purge all air from the domestic water system. Allow water to run so the tank is completely purged of any debris. Run the water long enough to change at least five tank volume changes. Close all faucets. Reinstall all of the screens in the faucets. Check the system for leaks. Repair as required.