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Program 0 - Single solar power system = factory settings

Program 0: Pump A1 runs when:

 S1 is greater than the threshold min1  and S1 is greater than S2 by the difference diff1

 and S2 has not exceeded the threshold max1.

A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1

All programs +1:

In addition, if S3 exceeds the threshold max2, pump A1 is switched off.

Program 4 – Simple drain-back - solar thermal system with valve

This program can only be selected with activated drain-back function (menu Enter/MEN -

DRAINB) selected.

The basic settings are made as in program 0:

During the day, a valve on output A3 prevents the flowing away of the heat transfer medium

out of the collector.

Once the filling time has elapsed, output A3 for the valve is on.

If pump A1 is shut-off due to the temperature difference valve A3 remains open for a further

2 hours.

However the valve is immediately closed if the collector temperature protection or frost

protection function becomes active, the radiation value falls below 50W/m² with the pump

shut down (only if a radiation sensor is being used) of if low water protection is activated and

the set volume flow is not reached after the filling time.

min1

max1

diff1

Required settings:

max1 … limit CYL S2  A1

max2 … see all programs +1

min1 … switch-on temp. coll . S1  A1

diff1 … coll. S1 – CYL S2  A1

S3 for program +1