Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 10)

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C. Locating the water heater.
Water heater should be located in an area where water leakage from the tank or connections will not result in damage to
areas adjacent to the water heater or to lower floors of the structure. When such a location can not be avoided, a suitable
drain pan must be installed under the water heater, and the drain pan must be connected to a drain.
Water heater should be installed as close to the boiler as is practical for easy access for service. Unit is designed for
installation on combustible flooring and in alcoves, closets, etc.
The minimum clearances from combustible surfaces are:
Bottom-------------------------0”
Left, right, and rear sides -- 1”
Front---------------------------1”
Top-----------------------------6”
The minimum clearances for service are:
Bottom-------------------------0”
Left, right, and rear sides -- 3”
Front--------------------------30”
Top-----------------------------6”
D. Additional components
1. Shut-off valves. Allows the isolation of the water heater from the boiler system during service.
2. Unions. Allows for easy locating or removal. Use dielectric unions or couplings to protect hot and cold water
fittings from corrosion when connecting dissimilar materials such as copper and galvanized pipe.
3. Vacuum breaker. Protects the water heater from collapse if a hot tank is valved off to service other components
in the system. Required for Commonwealth of Massachusetts.
4. 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, the installation of a thermal expansion tank is
required.
5. 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 control manufacturer's instructions for application and installation.
6. Backflow preventer. Protects potable water supplies from contamination due to backflow. Required for
Commonwealth of Massachusetts.
E. Removing the Existing Domestic Water Heating System
1. External Tankless Heater- Disconnect all lines to the boiler and plug the boiler fittings. Disconnect the external
heater from the boiler piping, and the domestic piping systems.
2. Internal Tankless Heaters- Disconnect the domestic piping. Do not plug the cold water or the hot water fittings
in the internal tankless coil. Leave the coil in the boiler with the cold and hot water fittings open to prevent
pressure build-up in the coil.
Front View Top View
NOTICE
For California installation this water heater must be braced, anchored, or stapped to avoid falling or
moving during an eathquake. See instructions for correct installation procedures. Instructions may
be obtained from California Office of the State Architect.