3 Level Liquid Level Relay

3 Level liquid Level Control “Filling & Emptying” with duty cycling DIP Switch Selectable

Used for control of water levels in tanks and sumps over short distances. The LLC3 controls 2 pump relays operated at different levels for “Duty” and “Standby” operation. The unit automatically alternates the pump relays between duty and standby using a built-in flip- flop action.

There are 4 DIP switches available to select emptying or filling
Filling: Sw 1 + 2 - ON (up position); Sw 3 + 4 - OFF (down position)

Emptying: Sw 1 + 2 - OFF(down position); Sw 3 + 4 - ON (up position)

Avanti AEL probes: connected to the terminals:
5 - “High;” 6 - “Middle;” 7 - “Low;” 8 - “Common”

Filling: If the level is below probe 7 - “Low” both relays will energise and when the level reaches probe 5 - “High” both relays will de-energise. When the level drops below probe 6 - “Middle” relay 1 will energise and de-energise when the level reaches probe 5 - “High.” The next on cycle with probe 6 - “Middle” out of the water, relay 2 will energise (alternating). If the level continues to fall and goes below the probe 7 - “Low,” both pumps will energise and only de-energise when probe 5 - “High” is reached (all probes in the water).

Emptying: When a rising level reaches probe 6 - “Middle,” relay 2 energises and de-energises when probe 7 - “Low” is reached. On the next rising level to probe 6 - “Middle” - relay 1 will energise (alternating). If the level continues to rise and probe 5 - “High” is reached, both relays will be energised (Duty & Standby) and when the level reaches probe 7 - “Low” both relays will de-energise.