Operating Instructions; Operating The Water Heater; Safety Controls; Water Temperature - Rheem HB Duct Ready Series Use & Care Manual

Operating the water heater

CAUTION: Hydrogen gas can be produced in a hot water system served by this water heater that has not been
used for a long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!!
To dissipate such gas and to reduce risk of injury, 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. If hydrogen is
present, there will be an unusual sound such as air escaping through the pipe as the water begins to flow. DO NOT
smoke or use an open flame near the faucet at the time it is open.
WARNING: If the water
heater has been subjected
to fire, flood or physical
damage, disconnect all
power to water heater, and
DO NOT operate the water
heater again until it has
been checked by a qualified
service technician.
NOTICE: DO NOT use
this appliance if any part
has been under water.
Immediately call a qualified
installer or service agency
to replace a flooded water
heater. DO NOT attempt
to repair the unit! It must
be replaced.
!
DANGER: There is a
hot water scald potential if
the thermostat is set too
high. Households with small
children, disabled, or
elderly persons may require
a 120°F or lower thermostat
setting to prevent contact
with HOT water.
Safety Precautions
Disconnect all power to water
heater if it has been subjected to
over heating, fire, flood, physical
damage.
DO NOT turn on water heater
unless it is filled with water.
DO NOT turn on water heater if
cold water supply shut-off valve
is closed.

Safety Controls

The water heater is equipped with a
temperature limiting control (ECO)
that is located above the upper heating
element in contact with the tank
surface. If for any reason the water
temperature becomes excessively
high, the temperature limiting control
(ECO) breaks the power circuit to
the heating element. Once the control
opens, it must be reset manually.
CAUTION: The cause of the high
temperature condition must be
investigated by qualified service
technician and corrective action
must be taken before placing the
water heater in service again.
Water Temperature Setting
The temperature of the water in the
water heater can be regulated by
selecting the desired temperature on
control display.
Safety and energy conservation
are factors to be considered when
selecting the water temperature setting
of the water heater. The lower the
temperature setting, the greater the
savings in energy and operating costs.
To comply with safety regulations the
temperature is factory set at 120°F or
less where local codes require. This is
the recommended starting point.
Water temperatures above 125°F can
cause severe burns or death from
scalding. Be sure to read and follow
the warnings outlined in this manual
and on the label on the water heater.
If there is any difficulty in
understanding or following the
Operating Instructions or the
Care and Cleaning section, it is
recommended that a qualified
person or serviceman perform the
work.
To reset the temperature limiting
control: (Refer to Illustration in Cavity
Insert section):
Disconnect all power to unit
before starting maintenance.
Remove the upper cavity cover
and insulation.
Press the red RESET button.
Replace the insulation, jacket
access panel and plastic housing
before turning on the power to
the water heater.
This label is located on the front of the
water heater.
Mixing valves are recommended
for reducing point of use water
temperature by mixing hot and cold
water in branch water lines. It is
recommended that a mixing valve
complying with the Standard for
Temperature Actuated Mixing Valves
for Hot Water Distribution Systems,
ASSE 1017 be installed. See page 4
for more details and contact a licensed
plumber or the local plumbing
authority for further information.
The chart on the page 3 may be used
as a guide in determining the proper
water temperature for your home.
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