Installation and operating instructions Wilo-Atmos PICO 9
en
3.1 Control modes and functions
Variable differential
pressure
Δp-v
(I, II, III)
Recommended for two-pipe heating systems with radi-
ators to reduce the flow noise at thermostatic valves.
The pump reduces the delivery head to half in the case of
decreasing volume flow in the pipe network.
Electrical energy saving by adjusting the delivery head to
the volume flow requirement and lower flow rates.
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 in three prescribed fixed speed
stages (I, II, III).
4 Intended use
The high-efficiency circulators in the Wilo-Atmos PICO
series are exclusively designed for circulating fluids in
hot-water heating systems and similar systems with
constantly changing volume flows.
Permitted fluids:
• Heating water according to VDI 2035
(CH: SWKI BT 102-01).
• Water-glycol mixtures* with a maximum of 50 %
glycol.
* Glycol has a higher viscosity than water. If glycol is
added, the delivery data of the pump must be corrected
to suit the mixing ratio.
II
III
I
H/m
Q/m³/ h
NOTE
Factory setting:
Δp-v
, pump curve II
I
III
II
H/m
Q/m³/ h
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