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All programs +1: In additional, hot water cylinder load pump A2 also switches on via the
heater boiler temperature S1.
Pump A2 runs when:
S1 is greater than the threshold min1 and S1 is greater than S4 by the difference diff3
and S4 has not exceeded the threshold max2
or S3 is greater than threshold min2 and S3 is greater than S4 by the difference diff
and S4 has not exceeded max2.
A2 = (S1 > (S4 + diff3) & S1 > min1 & S4 < max2)
or (S3 > (S4 + diff2) & S3 > min2 & S4 < max2)
All programs+2: The pump A3 runs if:
S5 is greater than threshold min3 and S5 is higher than S6 by the difference diff3
and S6 has not exceeded threshold max3
A3 = S5 > (S6 + diff3) & S5 > min3 & S6 < max3
Program 112 - 2 independent differential loops
Example: Solar thermal system with return flow booster
Program 112: Pump A1 runs, if:
S1 is greater than threshold min1 and S1 is greater than S2 by the difference diff1
and S2 has not exceeded the threshold max1.
The output A2 switches on, if:
S3 is greater than threshold min2 and S3 is greater than S4 by the difference diff2
and S4 has not exceeded the threshold max2.
A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1
A2 = S3 > (S4 + diff2) & S3 > min2 & S4 < max2
S1 S3
min1 min2
S2 S4
max1 max2
diff2
A2
diff1
A1
Required settings:
max1 … limit CYL S2 A1
max2 … limit return S4 A2
min1 … switch-on temp. coll. S1 A1
min2 … switch-on temp. CYL top S3 A2
diff1 … coll. S1 – CYL S2 A1
diff2 … CYL S3 – return S4 A2
S1
S2
A1
S1
S3
S4
A2
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