42
• Then adjust the red knob to the value ∆P for the requested water flow rate Q as per the following formula:
∆P = (Q / Qm)² x ∆Pm
For example:
With unit type 155 – fitted with Stratos Para 25/1-7, the requested water flow Q is 1.75 m3/h (see tables below).
For an adjustment in the maximum position (7 m w),if the measured water pressure is ∆Pm = 4.7 m, according circulating pump
curve, it relates to a flow rate of Qm = 2.3 m3/h.
Then, for a requested water flow of 1.75 m3/h, the adjustment will be :
∆P = (1.75 / 2.3)² x 4.7 = 2.1m w
Requested water flow (nominal): in m3/h
CONTENT 095 125 155 157 175 177 195 197 257 307
Pump reference
25/1-7 25/1-8 25/1-12
Water temp. 35°C
0.92 1.40 1.84 2.32 2.60 3.50 4.09
Water temp. 45°C
0.80 1.36 1.75 2.23 2.55 3.30 3.91
Water temp. 55°C
0.65 0.82 1.03 1.30 1.32 2.05 2.46
Wilo-Stratos Para 25/1-12
0 1 2 3 4 5 6 7 8 9 10 11 12
Water flow – m3/h
Differential pressure ∆P (mW)
Unit :
307
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