A2
A1
S5
W
W
S4
S1
K
W
Program 656 - Preparation of hot water including circulation and burner requirement
Only makes sense if the speed control is activated!
(Absolute value control system: AC I1, Differential control DC N31)
Program 656: Pump A1 runs when:
the flow switch (FS) S5 detects flow. The nominal value DVA for the PSC speed control
(absolute value control) of pump A1 is specified for sensor S1.
The circulation pump A2 runs when:
S3 is greater than the threshold min1 and S3 is greater than S4 by the difference diff1
and S4 has not exceeded the threshold max1.
Output A3 switches on when S3 falls below threshold min3.
Output
A3 switches off (dominant) when S2 exceeds max3.
A1 = flow switch (S5) = ON
A2 = S3 > (S4 + diff1) & S3 > min1 & S4 < max1
A3 (on) = S3 < min3 A3 (off) = S2 > max3
All programs +1: Circulation pump A2 is only switched on when in addition to the basic
function the volume flow switch
(FS) S5 is on (A1 = ON).
All programs +2: The burner requirement (A3) only occurs via sensor S3.
A3 (on) = S3 < min3 A3 (off) = S3 > max3 (dominant)
Required settings:
max1 … limit circulation return S2 A2
max3 … burner req. off CYL S2 A3
min1 … switch-on temp. CYL S3 A3
min2
… see all programs +4
min3 … burner req. on CYL S3 A3
diff1 … CYL S3 – circulation return S4 A2
S3
min1
S4
max1 A1 = FS (S5) = ON
Burner
A3
S3 min3
S2 max3
diff1
A2
CW
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