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This water heater uses an immersion
thermostat(s) to activate magnetic contactors
allowing current to flow to the immersion heating
elements. The standard control system uses one
immersion thermostat for each 54kW of electric
heating power in a water heater. As an option,
additional immersion thermostats may be
provided to add additional steps of thermostatic
control. The sensing bulb for each immersion
thermostat is immersed in the stored water in the
tank to provide quick, accurate response to
changes in water temperature, The thermostat
sensing bulb is located in the tank just above the
elements it is controlling. The immersion
thermostat set point is adjustable by rotating a
knob on the control. Turning the knob counter
clockwise decreases the temperature set point and
turning the knob clockwise increases the set
point. The temperature setting shown at the top
of the knob is the selected set point. The
immersion thermostat has a fixed 6°F (3.3°C)
differential.
Set temperature control to the lowest setting
which satisfies the hot water requirements of the
system. Lower water temperatures help minimize
scale formation on the heating elements. See
thermostat information below. For sequencer
specifications, consult controller literature.
This water heater has an adjustable thermostat to
control water temperature. The thermostat is
factory pre-set at approximately 125˚ F (51.7° C)
or less. Households with small children or
invalids may require a 120˚ F (48.9° C) or lower
temperature setting to reduce risk of scald injury.
Some states may require a lower temperature
setting. Check with your local codes or electric
utility for local requirements governing the
temperature setting. Remember, no water heating
system will provide exact temperatures at all
times. Allow a few days of operation at the
setting to determine the correct temperature
setting consistent with your needs.
13
WATER TEMPERATURE SETTINGS
TEMPERATURE REGULATION
IMMERSION THERMOSTAT(S)
FIG. 17 Immersion Thermostat with Adjustment Knob
HAZARD OF ELECTRICAL SHOCK –
Before opening the electrical access panel
to adjust the thermostat make sure the
electrical supply to the water heater is
turned “OFF”.
WARNING:
Full power is present whenever the cabinet
door is opened, even with the pilot
switch(es) turned off.
DANGER:
Hotter water increases the
risk of scald injury. Setting the temperature
selector dial higher provides hotter water,
which increases the risk of scald injury.
CAUTION:
(1) This water heater, when set at the lower
temperature setting, is not capable of
producing hot water of sufficient temperature
for sanitizing purposes.
(2) Higher stored water temperature increases
the ability of the heater to supply desired
quantities of hot water, however remember:
NOTE: