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Program 448 - Burner requirement and 2 feed pump functions
Program 448: Feed 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.
The feed pump A2 runs when:
S5 is greater than the threshold min2 and S5 is greater than S3 by the difference diff2
and S3 has not exceeded the threshold max2.
Output A3 switches on when S5 falls below threshold min3.
Output
A3 switches off (dominant) when S4 exceeds max3.
A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1
A2 = S5 > (S3 + diff2) & S5 > min2 & S3 < max2
A3 (on) = S5 < min3 A3 (off) = S4 > max3
Required settings:
max1 … limit CYL 1 S2 A1
max2 … limit CYL 2 S3 A2
max3 … burner req. off CYL 1 S4 A3
min1 … switch-on temp. boiler S1 A1
min2 … switch-on temp. CYL 1 S5 A2
min3 … burner req. on CYL 1 S5 A3
diff1 … boiler S1 – CYL 1 S2 A1
diff2 … CYL 1 S5 – CYL 2 S3 A2
diff3 … see all programs +2
S1 S5
min1 min2
S2 S3
max1 max2
diff2
A2
diff1
A1
Burner
A3
S5 min3
S4 max3
CYL 1
CYL 2
A1
A2
S1
A3
S3
S2
S4
S5
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