Installation / Operation Instruction Manual
29
The water heater temperature setting is adjusted by using the control display mounted to the front of the water
heater. The water heater thermostat is set at the lowest setpoint of 70F (21.1
C) when shipped from the
factory. The control display shows the temperature setpoint in degrees Fahrenheit (F) or degrees Celsius
(C), and the status of the water heater (“Idle” or “Heating”). If the water heater is functioning normally, the
display will also show “Operational”.
For energy efficient operation of your water heater, the suggested initial temperature setting is 120F (49
C).
During the winter season, or any cold period, you may desire a higher temperature setting to adjust for the
colder incoming water. This adjustment, however, may cause additional condensation to form on the cooler
tank surface. This does NOT mean the tank is leaking. During summer months, the warmer incoming water
temperatures will benefit the performance of your water heater and reduce the amount of condensation
developed.
Condensation does NOT mean your tank is leaking. Over 40% of reported tank leaks on installation are proven
to be condensation. To avoid unnecessary expense and inconvenience, make sure the tank is leaking, and
that it is not condensation, before calling a qualified service professional.
If the water heater is to remain idle for 30 days or more or is subjected to freezing temperatures while shut off,
the water heater and piping should be fully drained, and the drain valve should be left fully open. Refer to the
“Draining the Water Heater” in this Installation and Operation Manual (page 36) for this procedure.
WARNING
If the water heater display does NOT show “Operational” in the “Status” indicator, there may be an operating
malfunction with the water heater. If this is the case, a numeric code will be displayed. Refer to the label next to
the display for the definition of the error code and call your plumbing professional or service agent to service
the water heater. DO NOT try to reset the water heater without having a qualified service person to diagnose
and correct the problem. If the display is blank or does not show an error code, make sure there is power to the
water heater.
Setting the water temperature to the maximum set point can result in scalding hot water delivered to the
faucets. It is highly recommended that the maximum setpoint be adjusted to the lowest temperature possible
for the needs of the installation. See following section to change the maximum setpoint limit (max setpoint).
Make sure the water heater control display is not in a public area that can result in the temperature settings
being improperly adjusted. See previous warnings on scalds and an ASSE approved mixing valve.
NOTICE
When the maximum setpoint is reached, the display will show “Max Setpoint” without the setpoint value. The
maximum setting is equal to approximately 180˚F (82˚C). The default temperature setpoint from the factory is
70˚F (21.1˚C).
WARNING
Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a
long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To
prevent the possibility of injury under these conditions, we recommend a hot water faucet to be open for
several minutes before you use any electrical appliance which is connected to the hot water system. If
hydrogen is present, there will be an unusual sound such as air escaping through the pipes as hot water
begins to flow. DO NOT smoke or have open flame near the faucet at the time it is open.