Tips: The TANK float switch and WELL float switch must be distinguished by direction.
If the concave point is facing downward, it is the TANK float switch; if the concave point is facing upward, it is the WELL float switch.
When the concave point is facing upward, it is normally closed; otherwise, it is normally open.
For a single TANK float switch, connect it to the TH terminal. If no float switch is used, the system can run directly.