Diagram 48
13
Diagram 48:
Burner requirement, 2 feed pumps and simple solar power unit
Sensors
Outputs
T1…. Collector
A1…. Solar pump
T2…. Tank top
A2…. Feed pump solid fuel boiler
T3…. Tank center
A3…. Feed pump oil/gas boiler
T4…. Tank bottom
A4…. Burner requirement
T5…. Solid fuel boiler (“sfb”)
T6…. Oil/gas boiler (“ogb”)
Program 48:
Function according to diagram
A1 = T1 > (T4 + diff1) & T4 < max1
A2 = T5 > (T4 + diff2) & T5 > min1 & T4 < max2
A3 = T6 > (T3 + diff3) & T6 > min2 & T3 < max3
A4 (on) = T2 < max4 – hysteresis
A4 (off) = T2 > max4
T1 T5 T6
min1 min2
diff1
A1 diff2 diff3
A2 A3
T4 T3
max1 max3
max2
Required settings:
diff1
…coll. T1 – TK T4
A1
diff2
…sf-boiler T5 – TK T4
A2
diff3
…oil boiler T6 – TK T3
A3
diff4
…see all pr8
min1
…switch-on temp. sfb T5
A2
min2
…switch-on temp. ogb T6
A3
max1
…limit TK T4
A1
max2
…limit TK T4
A2
max3
…limit TK T3
A3
max4
…burner requirement TK T2
A4
Burner A4
T2 max4
Burner
requirement