Champion eucc series Betriebsanweisung

Each tank contains a dual float. A metal stem holds 2 stainless steel floats
which are free to move up and down. Magnets in the floats operate reed
switches in the stem. The switches control relays that control the tank heat

circuit.

1.

The bottom float controls the heat.

2.

When the bottom float is up, the bottom reed switch is Normally
Closed (NC).

1.

The top float controls a fill valve.

2.

When the top float is down, the top reed switch is Normally Open
(NO).

3.

When the top float is up, the top reed switch is Normally Closed
(NC).

1.

When the tank is completely empty, the top float is down and its reed switch is NO.

2.

The control relay for the float switch is de-energized.

3.

The fill valve for the tank is energized and the tank begins to fill with water.

4.

As the water level in the tank rises, the bottom float begins to move up.

5.

When the bottom float is completely up, its NO reed switch contacts close.

6.

This prepares the heat circuit, but the heat Does Not energize at this time.

7.

The tank continues to fill until the top float is completely up.

8.

The top float’s NO reed switch contacts close. Its control relay energizes.
The fill valve de-energizes.

9.

The heat circuit energizes through the NC contacts of the bottom float and the contacts of the
control relay.

1.

If the water level in a tank falls below the level of the top float, the top float moves down
and its reed switch contacts open.

2.

When the water level falls below the level of the bottom float, the bottom float moves down
and its reed switch opens.

3.

The control relay de-energizes. The fill valve energizes and refills the tank.

4.

The heat circuit will de-energize until the water level in the tank raises the top float again.

5.

The bottom float keeps the heat circuit ready as long as the water level is above the level
of the bottom float.