Pentair Intellichlor ICXX SWG

Cell Usage

Pressing and holding the “More” button launches the System Status Mode. When the lights finish scrolling, the percent lights indicate hours of usage in 1,000s. For example, if the 40% light lights, that indicates 4,000 hours.

Flow/Temperature Switch

The flow switch also contains a thermistor that senses water temperature. The water temperature is used for the salinity calculation. If the thermistor is failing the salinity will be incorrect.

Flow switch has 4 wires:

• Red/black - flow switch
• Green/white - temperature sensor

The IntelliChlor uses the Harwil Q-12DST-C2 flow switch. It has an integrated 10k thermistor.

With no temperature input, the cell defaults to a temperature of 77 Fahrenheit. The sensors are prone to failure. When the sensor fails and it's obvious to the software that the sensor has failed, it defaults to a standard temperature of 77 f.

A suspected bad flow switch can be confirmed by cutting the black and red wires and connecting them together coming out of the cell. If the cell operates with the wires connected this confirms the flow switch was bad. Do this only for temporary diagnostic purposes.

High Salt

High salt error occurs around 4500ppm. The cell will continue generating chlorine with a high salt warning.

Low or High Salt Lights

Always check salt level independent of the cell before adding salt. A failure of the temperature sensor will give incorrect salt warnings.

Cold Temperature

The cell will stop generating chlorine when water temperate is below 60 degrees.

If the cell light says cold when the water is warm, the temperature sensor is likely bad.

Displaying Cell Water Temperature

Version 3.1 on adds the ability to determine system temperature. Pressing the “More” button after the display shows 1,000s of hours of usage, will show temperature as follows:

Lights	Temperature
No LEDs	Below 30F
40%	36 to 45F
40% and 60%	46 to 55F
60%	56 to 65F
60% and 80%	66 to 75F
80%	76 to 85F
80 and 100%	86 to 95F
100%	96 to 99F
100% blinking	over 99F
All LEDs blinking	Sensor bad

Press and hold the More button until the lights scroll and note which % light lights up. Then, immediately press the More button again and see which % lights light up.

Salinity Calculation

The salinity is calculated based on the conductivity of the water and the water temperature.

The conductivity sensor is a separate device in the cell which can be seen if you look in the cell.

The Intellichlor manual states that measurements will vary between measuring devices (salt test strips, electronic testers, andtitration). The salt sensor reading is within +/- 500 ppm accuracy.

Salt Levels

• 3600 ppm of salt is recommended for optimum water condition.
• Low salt concentration below 2600 ppm will cause the unit to turn off
• High salt concentration above 4500 ppm may cause excessive corrosion or deterioration to pool equipment and surrounding surfaces in and around the pool.
• The cell tests the salt level every 12 hours. So it may take 12 hours for the salt level on the cell to change after adding salt.

Cycle Time

The Intellichlor cycles the % generation in 5 minute intervals. If the % generation is set to 50% the cell will generate chlorine for 2.5 minutes and be idle for 2.5 minutes.

ET/ScreenLogic reports Salt Level as Zero

For some reason, unknown to Pentair, minor changes to the system will cause the salt level in the EasyTouch and ScreenLogic to read zero. This is just an error in reporting and the cell should still be working as long as the actual salt level is ok and the cell does not show a "red low salt" light on the cell. I believe that there is a timing issue in the circuitry that reports the salt reading to the EasyTouch. It is obvious that the cell knows what the real salt level is. This has been "Fixed" by the following actions:

• Just shutting off and rebooting the ET
• Replacing the flow switch
• Replacing the ET's surge card (power supply for the cell)
• Replacing the ET's main board
• Replacing the salt cell itself.

Power Center

The ICXX cells are powered by either a stand-alone Power Center box or a transformer that is integrated with an Easy Touch or Intellicenter Load Center.

Power Center Wiring

The stand-alone Power Center box can run with 120V or 240V ac power. You have to wire the transformer for 240 volts or 120 volts.

When using 240 volts (often called 220) you connect L1 to the Yellow wire and L2 to the White wire and connect the Blue/Violet to the Black wire with a wire nut.

When using the 120 volts, you connect the hot wire to the Yellow and Black wires and the Neutral to the Blue/Violet and White wires.

Cell Should Not be Powered When Pump is Off

The flow switch is a secondary safety mechanism. There should be a primary means for the cell not to be powered when the pump is off and there is no water flow. This can be with pool automation equipment or a mechanical timer.

Pentair Manuals say:

The IntelliChlor Salt Chlorinator Power Centers must be interconnected with the pool pump motor power source. This ensures the IntelliChlor Salt Chlorinator and pool pump will switch on and off together.

and

WARNING:CHLORINE GAS BUILDUP CAN OCCUR WITH IMPROPER WIRING: To reduce the risk of personal injury the IntelliChlor® Salt Chlorine Generator (SCG) Power Center must be installed on and wirded to the load side of the time clock, electronically controlled switch, or relay load side, so that it will receive power only when the pool pump is on. Otherwise, dangerous chlorine gas buildup can occur. The IECG should never be energized when the pool pump is OFF and water is not flowing through the unit.

Cell Explosions do Happen

Here is one report - Explosion near the SWG