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58
Program 672 - 3 generators to 1 co difference c burner requirement
No diagram available
Program 672:
Pump
A1
runs if:
S1
is greater than threshold
min1
and
S1
is higher than
S2
by the difference
diff1.
and
S2
has not exceeded threshold
max1
.
The pump
A2
runs if:
S1
is greater than threshold
min1
and
S1
is higher than
S5
by the difference
diff2
.
and
S5
has not exceeded threshold
max2
.
or
S3
is greater than threshold
min2
and
S3
is higher than
S5
by the difference
diff2
and
S5
has not exceeded threshold
max2
.
or
S4
is higher than
S5
by the difference
diff2
and
S5
has not exceeded threshold
max2
.
The output
A3
switches on if
S6
falls below the threshold
min3
.
The output
A3
switches off (dominant) if
S5
exceeds the threshold
max3.
A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1
A2 = S1 > (S5 + diff2) & S1 > min1 & S5 < max2
or
S3 > (S5 + diff2) & S3 > min2 & S5 < max2
or
S4 > (S5 + diff2) & S5 < max2
A3 (on) = S6 < min3
A3 (off) = S5 > max3
All pr1:
The burner requirement (
A3
) is only made via sensor
S6
.
A3 (on) = S6 < min3
A3 (off) = S6 > max3
(dominant)
All pr2:
The burner requirement (
A3
) is only made via sensor
S5
.
A3 (on) = S5 < min3
A3 (off) = S5 > max3
(dominant)
Required settings:
max1
… limit TK1
S2
A1
max2
… limit TK2
S5
A2
max3
… burner req. off TK 2
S5
A3
min1 …
switch-on t. boiler1
S1
A1, A2
min2 …
switch-on t. boiler2
S3
A2
min3
… burner req. on SP TK 2
S6
A3
diff1
… boiler1
S1 –
TK 1
S2
A1
diff2
… boiler1
S1
– TK 2
S5
A2
… boiler2
S3
– TK 2
S5
A2
… boiler3
S4
– TK 2
S5
A2
S3
S4
S1
min2
min1
S5
S2
max2
max1
diff2
A2
diff2
A2
diff2
A2
Burner
A3
S6 min3
S5 max3
diff1
A1