Hubbell Electric Heater Company J - Manual (Page 25)

2. LOF, for low water off.
iii. Low water reset – sets the low water reset for either automatic or manual
1. LAU, for low water automatic reset. (Factory Default)
2. LAn, for low water manual reset.
iv. Temperature units – sets the temperature units to either degrees
Fahrenheit or Celsius.
1. DEF, for degrees Fahrenheit. (Factory Default)
2. DEC, for degrees Celsius.
v. Differential – sets the number of degrees below setpoint that the heater
will resume heating after it has achieved setpoint.
1. d##, where ## is the differential in degrees (1 to 20). (Factory set
at 02)
vi. Display – sets the display to either setpoint or actual temperature.
1. dSS, for display setpoint temperature. (Factory Default)
2. dSt, for display actual temperature.
vii. Heater Interlock – sets the heater interlock mode to on or off. (Only
available with r23 or later software).
1. HoF, to disable the 24-volt interlock feature. (Factory Default)
2. Hon, to enable the 24-volt interlock feature.
e. To leave the configuration menu, wait 5 seconds without pushing any buttons or
press the UP and DOWN buttons simultaneously.
5. To reset any high-limit, no probe, or low water (when in manual reset mode) fault
condition, press the RESET button.
6. Display
a. By default the display will show the setpoint of the booster heater.
b. The decimal points on the display, as shown below, indicate that the controller
is calling for a contactor to pull in.
ANNUAL INSPECTION
1. Monitor water temperature
a. Let water heater completely heat to a designated temperature setting.
b. After controller satisfies (that is, when the magnetic contactor actually clicks
off), draw water from as close as possible heater outlet and measure the
temperature.
c. Compare the water temperature of outlet water to the temperature setting of
the display when it satisfies. Normal variation between the two points is
approximately + 5°F.
d. If these two readings do not coincide within acceptable tolerances and
verification has been made of the accuracy of the temperature-reading gauge,
replace the control board and/or the sensor probe.
2. Lift test lever on relief valve and let water run through valve for a period of
approximately 10 seconds. This will help flush away any sediment that might build up
in water passageways.
3. Inspect element for leakage as follows:
a. Shut off power supply.
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