REUK 12V Programmable Sump Pit Controller
Pictured above is a labelled image of the REUK Programmable Sump Pit Controller.
If you are using a liquid sensor, ensure that the red lead of the sensor is connected to the point labelled liquid sensor +ve and the black lead to liquid sensor GND. We recommend that the liquid sensor be fitted at a 20 degree angle from the horizontal (rather than horizontal) so that liquid can drain from it more quickly. If you position the sensor vertically, there is the likelihood that one half of the liquid sensor will remain submerged in liquid for a long period of time which is not a good idea.
If you are using a float switch it does not matter which way around the two leads are connected.
Programming the Controller
Time how long it takes to empty your sump pit and programme in a pumping time of around 70-80% of that time to ensure that the pump will never run dry.
The controller is pre-programmed with a minimum pumping time - e.g. 2 minutes*. The mini push switch is used to increase this to correspond to the actual pumping time necessary for your sump pit. If your circuit is set to produce pumping times with 15 second steps you could therefore set your timer to 2 minutes, 2m15, 2m30, 2m45, 3m00 and so on following the simple instructions below.
*The minimum time delay and the size of the increments should be agreed with REUK before purchase.
In the instructions which follow we'll work with a 2 minute minimum time delay and 15 second increments.
Press the mini push switch once to enter programming mode. The LED indicator will light up and stay on for 2 seconds. When it goes out, press the mini push switch the same number of times as you require addition 15 second increments. So, if you want the pump to come on for 4 minutes, you start from the base of 2 minutes and require a further 8 x 15 secs to get to 4 minutes.Therefore, you would press the button 8 times.
If you don't press the mini push switch for 2 seconds, the circuit will assume you have finished. It will then flash the LED on and off the same number of times as you have entered thereby confirming you have programmed the circuit correctly.
Your entered pumping time is stored on the microprocessor chip and will be saved even when the circuit is not powered. You can change/reset the pumping time whenever you want following the above instructions (but not when the pump is already on).
Pump Activation
The pump will only be activated if the float switch (or liquid sensor) detects water continuously for 2 seconds. This prevents the pump being activated by a splash or drip of water, or the sensor/float switch being knocked.
The Relay
The fitted relay is rated at 12A at up to 30VDC and up to 230VAC. However, this circuit has not been designed for direct connection to high voltage pumps. If you intend to use this circuit to control a high voltage pump, then you must use the on board relay output to switch a secondary relay on a complete separate board which must be earthed and insulated in accordance with the law. The services of a qualified electrician should be employed.