Operating Instructions; Safety Controls; Water Temperature - Rheem MHD75245 Use & Care Manual

Light duty commercial electric water heaters
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Operating the water heater.
NOTICE: It is important
that the fiberglass insulation
is replaced to maintain water
heater's performance.
!
DANGER: There is a hot
water scald potential if the
thermostat is set too high.
Locations with small
children, disabled, or elderly
persons may require a 120°F
(49°C) or lower thermostat
setting to prevent contact
with HOT water.
!
DANGER: The water
heater will experience the
highest water temperatures
the first time the unit is
operated as it is conditioned
and the temperature
stabilizes.
14
Safety Precautions
DO turn off 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
combination thermostat and temperature
limiting control (ECO) that is located
above the heating element in the upper
control box. 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 setting the
temperature dial of the adjustable surface
mounted thermostat(s) located behind the
jacket access panel(s).
Dual element heaters have two
thermostats.
Safety and energy conservation are factors
to be considered when selecting the water
temperature setting of the water heater's
thermostat(s). The lower the temperature
setting, the greater the savings in energy
and operating costs.
To comply with safety regulations the
thermostat(s) are factory set at 120°F or
less where local codes require. Canadian
models are set to 140° F (60° C). These
are the recommended starting points.
Water temperatures above 125°F (51°C)
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.
The unit must be completely filled
with water before turning on the
power.
To reset the temperature limiting control:
Turn off the power to the water
heater.
Remove the jacket access panel(s)
and insulation from the top control
box.
The thermostat protective cover
should not be removed.
Press the red RESET button.
Replace the insulation and jacket
access panel(s) before turning on the
power to the water heater.
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. This label
is located on the water heater near the
thermostat access panel.
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 3 for more
details and contact a licensed plumber or
the local plumbing authority for further
information.
The chart on the next page may be used
as a guide in determining the proper water
temperature for your location.

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