Installation and operating instructions Wilo-Varios PICO
11
en
Constant
differential
pressure
Δp-c
(I, II, III)
Recommended for underfloor heating.
Or for large-sized pipes, applications without a variable
pipe network curve (e.g. storage charge pumps) or sin
-
gle-pipe heating systems with radiators.
The controls keep the set delivery head constant, inde
-
pendent of the delivered volume flow.
There are three pre-defined pump curves (I, II, III) to
choose from.
Constant speed
(I, II, III)
Recommended for systems with fixed system resistance
requiring a constant volume flow.
The pump runs uncontrolled in three prescribed fixed
speed stages (I, II, III).
External control via
a PWM signal
The required setpoint/actual value comparison for con
-
trol is performed by an external controller.
A PWM signal (pulse-width modulation) is fed as a cor
-
recting variable to the pump.
The PWM signal generator gives the pump a periodic
sequence of impulses (the duty cycle) in accordance
with DIN IEC 60469-1.
III
I
II
H
/m
Q
/m³/ h
I
III
II
H
/m
Q
/m³/ h
55 (45)%
45 (55)%
5 (95)%
65 (35)%
35 (65)%
75 (25)%
85 (15)%
15 (85)%
25 (75)%
H
/m
Q
/m³/ h
% PWM 1 (% PWM 2)
