Dunkirk Hotline Indirect Water Heater - Manual (Page 7)

Page 7
SECTION II: GENERAL INFORMATION (cont.)
ANODE RODS
The anode rod is used as a sacrificial element within the volume of the storage tank. The
purpose of the magnesium anode rod is to protect the inside of the tank against corrosion.
Anode rods should be inspected twice in the first year and at least yearly once a time interval
for inspection has been developed. Water conditions can influence the consumption rate of
the anode rods. Please see the Maintenance section of this manual for instructions on how to
change the anode rods in your Hot Line water heater.
CAUTION: Hydrogen gas is produced in a hot water system served by this heater that has not been used for
a long period of time (2 weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury
under these conditions, it is recommended that the hot water faucet be opened for several minutes at the
kitchen sink before using any electrical appliance connected to the hot water system. When hydrogen is
present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to
flow. There should be no smoking or open flame near the faucet at the time it is open (UL 174).
TEMPERAURE AND PRESSURE RELIEF VALUE (T&P)
The T&P valve is factory installed. A discharge drain tube must be installed (responsibility of
the installer) and shall terminate plain, not threaded, 6 inches above the floor drain. The
drain tube material must be approved for temperatures of 120°F or greater, and a pressure of
150 PSI or greater.
BACK-FLOW PREVENTOR (CLOSED LOOP SYSTEM)
Some local municipal codes and ordinances require the use of these devices on potable
(domestic) water lines. Where back-flow preventors are required, it will be necessary to
install a thermal expansion tank (designed for used with potable water) in order to prevent
pressure build up in the indirect heater and associated piping, which could cause the T&P
valve to discharge. Follow the expansion tank manufacturer’s recommendations when
selecting a tank for your hot water system.
Note: Working pressure of the water heater is 150 PSI. Do not exceed 150 PSI.