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Program 592 - 2 generators on 2 consumers + independent differential loop
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Program 592: Pump A1 runs when:
S1 is greater than the threshold min1 and S1 is greater than S3 by the difference diff1
and S3 has not exceeded the threshold max1.
or
S2 is greater than the threshold min2 and S2 is greater than S3 by the difference diff1
and S3 has not exceeded the threshold max1.
Feed pump A2 runs when:
S1 is greater than the threshold min1 and S1 is greater than S4 by the difference diff2
and S4 has not exceeded the threshold max2.
or
S2 is greater than the threshold min2 and S2 is greater than S4 by the difference diff2
and S4 has not exceeded the threshold max2.
The feed pump A3 runs when:
S5 is greater than the threshold min3 and S5 is greater than S6 by the difference diff3
and S6 has not exceeded the threshold max3
A1 = S1 > (S3 + diff1) & S1 > min1 & S3 < max1
or S2 > (S3 + diff1) & S2 > min2 & S3 < max1
A2 = S1 > (S4 + diff2) & S1 > min1 & S4 < max2
or S2 > (S4 + diff2) & S2 > min2 & S4 < max2
A3 = S5 > (S6 + diff3) & S5 > min3 & S6 < max3
Required settings:
max1 … limit CYL 1 S3 A1
max2 … limit CYL 2 S4 A2
max3 … limit CYL 3 S6 A3
min1 … switch-on t. boiler1 S1 A1
min2 … switch-on t. boiler2 S2 A2
min3 … switch-on temp. coll. S5 A3
diff1 … boiler 1 S1 – CYL 1 S3 A1
… boiler 2 S2 – CYL 1 S3 A1
diff2 … boiler 1 S1 – CYL 2 S4 A2
… boiler 2 S2 – CYL 2 S4 A2
diff3
… coll. S5 – CYL 3 S6 A3
S1 S2
min1 min2
S3 S5 S4
max1 min3 max2
S6
max3
diff1
A1
diff1
A1
diff2