Rheem Indirect Water Heater - Manual (Page 6)

Page 6
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 Rheem indirect water heater.
CAUTION: Hydrogen gas is produced in a hot water system served by this indirect water 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).
TemperaTure 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 water 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.
NOTICE: Working pressure of the indirect water heater is 150 PSI. Do not exceed 150 PSI.