Waterco Digiheat In Line Heaters
OPERATING THE DIGIHEAT
After familiarising yourself with the layout and settings of the touch pad (see previous section), fill the
spa or pool with water and follow the instructions below.
We suggest that you instruct all the people who will use the spa or pool fitted with the DigiHeat on
how to operate it by either by giving them this manual or by showing them yourself.
Reading, understanding and following this guide should lead to trouble free operation of the DigiHeat
spa and pool heater.
1. Fill the spa or pool with water and then switch on the water pump.
2. Switch on the power to the DigiHeat. The controller will then display “OFF” or the water
temperature. If the pump is not running or if there is insufficient water flow, “nFL” will be displayed.
(Please refer to troubleshooting section of this manual for “nFL”)
3. If the display reads “OFF” press the on/off button to switch on the Digiheat, the temperature will
then be displayed.
4. Press and release the Up or Down button and the set temperature will be displayed with either
the ˚C or oF indicator LED flashing.
• To increase the desired set temperature press and hold the up button which will allow the
set temperature to be raised up to a maximum of 40˚C (104˚F). Release the button when the
desired temperature is displayed on the screen.
• To decrease the desired water temperature press and hold the down button. Release the
button when the desired temperature is displayed on the screen.
5. With an accurate thermometer check that the actual water temperarture in the pool or spa is the
same as the temperature displayed on the Digiheat.
If the displayed water temperature is different to the actual water temperature the controller will need
to be calibrated. This can only be done whilst the temperature is shown in ˚C. Refer to the following
section “temperature calibration”.
TEMPERATURE CALIBRATION (bias)
It is possible to have a temperature variation between the water in the spa or pool and the DigiHeat
controller. This is also referred to as the “Bias” adjustment setting. This adjustment can only be
carried out whilst the controller is set for “C” (centigrade).
Example:
if the water in the pool or spa is 26º C and the DigiHeat control displays 24ºC.
To calibrate the temperature variation, set the bias to +2 with the following procedure:
1. Switch on both the pump and the Digiheat.
2. With the use of an accurate thermometer read the pool or spa water temperature (e.g.: 26˚C).
3. Next read the temperature displayed on the DigiHeat control (eg: 24˚C).
4. To determine the bias setting subtract the pool or spa water temperature from the DigiHeat
Temperature.
Eg : 26 - 24 = 2˚C. Therefore we must compensate for the variation by setting the bias to +2.
If the temperatures were reversed eg; the water temperature was 24 and the Digiheat control was
26 we would require a bias setting of -2.
Eg : 24 - 26 = -2. Therefore we must compensate for the variation by setting the bias to -2.
5. Enter the programming mode by simultaneously pressing on the UP and DOWN arrows.
6. Once the temperature display is flashing press on the ON/OFF button.
7. Using the UP and DOWN arrows, enter the calibration value, (+2). In this case, by pressing the UP
arrow twice.(if the down arrow is used the bias will be a negative figure)
8. Once the bias has been entered wait until the calibrated temperature appears back on the display.
LOSS OF POWER
If the power supply to the Digiheat is lost, either by disconnecting it from the power supply or from
a “blackout”, when power is restored the DigiHeat will operate as follows,
1. If the Digiheat was “ON” prior to the power interruption, it will continue heating if the pump is
running and the set temperature is higher than the displayed temperature when the power is
restored. If the pump is not running the display will show nFL.
2. If the Digiheat was switched “OFF” prior to the power interruption, it will remain “OFF” when
power is restored.
EMPTYING THE SPA
If you intend emptying the water from the spa, disconnect the Digiheat and pump from the power
supply (isolating switch) to ensure the Digiheat will not be accidentally switched on while the spa is
empty. The pump can be damaged if it is run without water. Serious damage or injury may result.
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pg 07
