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INST 396 Jacuzzi® J-HN Series Heater V12-16
DIGITAL THERMOSTAT OPERATION
DESCRIPTION
The sophisticated digital thermostat provides temperature read out, set point temperature, operating status of the heater and any
fault conditions.
TEMPERATURE DISPLAY
The temperature display indicates water temperature in the inlet of the heater. Therefore the pump must be operating for an
accurate pool or spa water temperature to be displayed.
Comfortable pool temperature is between 78˚F and 86˚F (26º & 30º C). Normal spa temperature is between 96˚F and 101˚F.(36º &
38º C) To select your desired temperature press the up or down button repeatedly until the desired temperature is reached.
To prevent rapid cycling of the heater, the thermostat has an inbuilt time delay which prevents the heater from turning on for two
minutes after the set point has been reached. If the time delay is activated, the symbol “L” will be displayed on the LCD screen on
the front of the heater. This is part of normal operation.
Should a fault condition occur, the heater will lock out and prevent further heating. A lock out condition is indicated by the symbols
F0 to F3. To reset a lock out condition, turn the power off for five seconds.
When the water temperature is heated to within 1.8°F of the thermostat set point, the Jacuzzi® J-HN Series series heater burner
will turn down so that the set point is not exceeded. In addition, the set point is maintained very accurately, so that when using
your spa or pool, you will notice very little variation in water temperature.
POWER LOSS TO UNIT
The following will happen in event of power loss to the unit;
WHILE THE UNIT IS ON OR IN LOCK OUT MODE
The unit will turn off. If power is restored before the fan has time to stop, around 10 seconds then the unit will not light. You will
need to turn off power to the unit and wait for 10 seconds or until fan has stopped and then turn the power back on. Turn the unit
on if it’s not already. The unit will relight.
If the power is off for more than 10 seconds or enough time for the fan to stop then the unit will turn back on and relight
automatically once the power is restored.
WHILE THE UNIT IS OFF
When power is restored the unit will remain in the off mode.
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