Diagram B0
29
All Pr1:
The feeding of the hot water tank is normally done by the difference buffer
T5
– hot water tank
T2
. This program considers also the boiler temperature
T6
.
A1 = T1 > (T4 + diff1) & T4 < max1
A2 = T5 > (T2 + diff2) & T2 < max2 & T5 > min1
or T6 > (T2 + diff4) & T2 < max2 & T6 > min2
A3 = T6 > (T3 + diff3) & T3 < max3 & T6 > min2
A4 (on) = T5 < max4 – hysteresis
A4 (off) = T5 > max4
All Pr2:
Separated on and off thresholds for the burner requirement
A3 = T6 > (T3 + diff3) & T6 > min2
A4 (on) = T5 < max3
A4 (off) = T3 > max4
All Pr4:
Diagram with solid fuel boiler instead of a solar power system. The thresh-
old
min1
affects not at
T5
but at
T1
.
T1 T5 T6
min1 min2
diff1 diff2 diff4 diff3
A1 A2 A2 A3
T4 T2 T3
max1 max2 max3
Required settings:
diff1
…coll. T1 – TP1 T4
A1
diff2
…TK1 top T5 – TK2 T2
A2
diff3
…boiler T6 – TK1 T3
A3
diff4
…boiler T6 – TK2 T2
A2
min1
…switch-on temp. TK1 T5
A2
min2
…switch-on temp. boiler T6
A2, 3
max1
…limit TK1 T4
A1
max2
…limit TK2 T2
A2
max3
…limit TK1 T3
A3
max4
…burner requirement T5
A4
Burner A4
T5 max4