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Program 528 - 2 independent differential loops and independent burner requirement
Program 528: Pump A1 runs when:
S1 is greater than the threshold min1 and S1 is greater than S2 by the difference diff1
and S2 has not exceeded the threshold max1.
Feed pump A2 runs when:
S3 is greater than the threshold min2 and S3 is greater than S4 by the difference diff2
and S4 has not exceeded the threshold max2.
Output A3 switches on when S6 falls below threshold min3.
Output
A3 switches off (dominant) when S5 exceeds max3.
A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1
A2 = S3 > (S4 + diff2) & S3 > min2 & S4 < max2
A3 (on) = S6 < min3 A3 (off) = S5 > max3
All programs +1: The burner requirement (A3) only occurs via sensor S6
A3 (on) = S6 < min3 A3 (off) = S6 > max3 (dominant)
Required settings:
max1 … limit CYL 1 S2 A1
max2
… limit CYL 2 S4 A2
max3 … burner req. off CYL 3 S5 A3
min1 … switch-on temp. coll.1 S1 A1
min2 … switch-on temp. coll.2 S3 A2
min3 … burner req. on CYL 3 S6 A3
diff1 … coll.1 S1 – CYL 1 S2 A1
diff2 … coll.2 S3 – CYL 2 S4 A2
S1 S3
min1 min2
S2 S4
max1 max2
diff2
A2
diff1
A1
Burner
A3
S6 min3
S5 max3
CYL 1 CYL 2 CYL 3
S3
S1
S4
A2
A3
S5
S6
S2
A1
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