Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters User Manual
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I. General Information
IMPORTANT INFORMATION – READ CAREFULLY
NOTE: The equipment shall be installed in accordance with those installation regulations required in the area where the
installation is to be made. These regulations shall be carefully followed in all cases. Authorities having jurisdiction shall be
consulted before installations are made.
All wiring on water heaters shall be in accordance with the National Electrical Code and/or local regulations.
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury, or loss
of life. Read and understand the entire manual before attempting installation, start-up, operation, or service. Installation
and service must be performed only by an experienced, skilled installer or service agency.
This water heater contains very hot water under high pressure. Do not unscrew any pipe fittings or attempt to disconnect
any components of this water heater without positively assuring that the water is cool and has no pressure. Always wear
protective clothing and equipment when installing, starting up or servicing this water heater to prevent scalding injuries.
Do not rely on the pressure and temperature gauges to determine the temperature and pressure of the water heater.
This water heater contains components that become very hot when the boiler is operating. Do not touch any components
unless they are cool.
Failure to follow all instructions in the proper order can cause personal injury or death. Read all instructions, including all
those contained in component manufacturers’ manuals before installing, starting up, operating, maintaining, or servicing
the water heater.
CAUTION
!
To reduce the risk of excessive pressures and temperatures in this water heater, install temperature and pressure
protective equipment required by local codes but no less than a combination temperature relief valve certified by a
nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials,
as meeting the requirements for Relief Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22-
latest edition. This valve must be marked with a maximum set pressure not to exceed the marked working pressure of
the water heater. Install the valve into an opening provide and marked for this purpose in the water heater, and orient it
or provide tubing so that any discharge from the valve will exit only within 6 inches above, or at any distance below, the
structural floor, and cannot contact any live electrical part. The discharge opening must not be blocked or reduced in size
under any circumstances.
These water heaters with single-wall stainless steel heat exchangers meet the Uniform Plumbing Code for installation in
potable water systems provided that:
• The boiler water, including additives, is practically non-toxic, having a toxicity rating of class 1 as listed in Clinical
Toxicology of Commercial Products, latest edition.
• The boiler water pressure is limited to maximum 30 psig by an approved safety or relief valve.
• The heat transfer medium is potable water or contains only substances that are recognized as safe by the U.S. Food
and Drug Administration. (FDA)
• The pressure of the heat transfer medium is maintained less than the normal minimum operating pressure of the
potable water system.
The maximum boiler water supply temperature to the indirect heat exchanger must not exceed 240 deg. F (115 deg. C).
Improper water quality will reduce the life of the water heater. Hard water, sediment, high or low PH and high levels of
chlorides in the domestic water should be avoided. Be sure that PH levels fall between 6 and 8 and dissolved chlorides
are less than 100 ppm. A filter must be used where sediment is greater than 5 microns in size in the water supplied to
the unit. A water softening system is recommended for areas with hard water. In cases where water quality is unknown, a
qualified water treatment expert should be consulted.
NOTICE: Damage to tanks caused by improper water quality is not covered under the warranty.