Diagram D0
32
T1 T2 T3 T6
min1 min2
diff1 diff2 diff3 diff4
A1 A2 A3 A4
T4 T5
max1 max4
max2
max3
Required settings:
diff1
…coll. T1 – SP1 T4
A1
diff2
…heat source T2 – TK1 T4
A2
diff3
…boiler T3 – TK1 T4
A3
diff4
…TK1 T6 – TK2 T5
A4
min1
…heat source T2
A2
min2
…boiler T3
A3
max1
…limit TK1 T4
A1
max2
…limit TK1 T4
A2
max3
…limit TK1 T4
A3
max4
…limit TK2 T5
A4
Diagram D0:
Simple solar power system, 2 feed pumps, feed pump for domestic hot
water tank
Sensors
Outputs
T1…. Collector
A1…. Solar pump
T2…. Heat source
A2…. Feed pump TK1
T3…. Boiler
A3…. Feed pump TK1
T4…. Tank TK1 bottom
A4…. Feed pump TK2
T5…. Tank TK2 bottom
T6…. Tank TK1 top
Program D0:
Function according to
diagram.
A1 = T1 > (T4 + diff1) & T4 < max1
A2 = T2 > (T4 + diff2) & T2 > min1 & T4 < max2
A3 = T3 > (T4 + diff3) & T3 > min2 & T4 < max3
A4 = T6 > (T5 + diff4) & T5 < max4
E.g. heat recovery
TK1
TK2