The Tank Full Switch uses a float and a counterweight to define the pump ON and OFF levels inside the tank. Correct adjustment is essential to ensure reliable switching and to avoid frequent start/stop cycles.
Before proceeding, make sure that the “Tank Full Switch” accessory is activated (either manually or via the S-connect app). See article
Role of the counterweight:
The counterweight is a critical component of the Tank Full Switch. It:
- Fixes the switching point
- Ensures a defined tipping movement of the float
- Prevents switch fluttering (frequent ON/OFF cycles)
- Prevents the float from moving uncontrollably
Without the counterweight, the float would not tilt correctly and the switch would not operate reliably.
Step-by-Step adjustment
WARNING - Disconnect power from the controller before performing any installation, inspection, maintenance or cleaning activities.
Place the float and counterweight inside the tank.
Position the float at approximately the desired maximum water level (Pump OFF position).
Secure the float cable at the top of the tank using a cable clamp or another suitable fixing point.
The counterweight determines the pivot point of the float and therefore:
- The water level at which the pump switches OFF
- The water level at which the pump switches ON
- The distance between both points (the pumping range or hysteresis)
- The further the counterweight is from the float, the greater the pumping range.
- The closer the counterweight is to the float, the smaller the pumping range.
Adjust the position of the counterweight by sliding it along the cable until the desired level range is achieved.
If necessary, also readjust the fixing point of the float cable at the top of the tank.
Verify float clearance inside the tank, ensuring that the float:
- Hangs freely
- Does not touch the walls of the tank
- Does not come into contact with pipes or other internal elements
- Does not rest on the bottom of the tank
Minimum recommended distance from tank walls: ≥ 5 cm [2 in]
Reconnect power and turn on the controller. Check that:
- The pump switches OFF when the upper level is reached
- The pump switches ON again when the water level drops
If required, readjust the position of the counterweight until the desired switching behavior is achieved.
