Wilo Yonos PICO User manual
























4 209 895-Ed.01 / 2017-03
Wilo-Yonos PICO
Pioneering for You
en Installation and operating instructions

Fig. 1:
1 9
4
5
2
3
671112
810
Fig. 2: Fig. 3a:
Fig. 3b:
PE NL

Fig. 3c:
Fig. 3d:
Fig. 3e:
Fig. 3f:
Fig. 4:

4Wilo SE 03/2017
en
1 General information
About these
instructions
These installation and operating instructions are an
integral part of the product. Read these instructions
before commencing work and keep them in an accessi-
ble place at all times.
Strict adherence to these instructions is a precondition
for the intended use and correct operation of the pro-
duct. All information and markings on the product must
be observed.
The language of the original operating instructions is
German. All other languages of these instructions are
translations of the original operating instructions.
2Safety
This chapter contains basic information which must be
adhered to during installation, operation and mainte-
nance. Additionally, the instructions and safety instruc-
tions in the other chapters must be observed.
Failure to follow the installation and operating instruc-
tions will result in risk of injury to persons and damage to
the environment and the product. This will result in the
loss of any claims for damages.
Failure to follow the instructions will, for example, result
in the following risks:
• Danger to persons due to electrical, mechanical and
bacteriological factors as well as electromagnetic fields
• Environmental risks due to leakage of hazardous sub-
stances
• Property damage
• Failure of important functions of the product
Identification of
safety instructions
These installation and operating instructions set out
safety instructions for preventing personal injury and
damage to property that are displayed in different ways:
• Safety instructions relating to personal injury start
with a signal word and are preceded by a
corresponding symbol.

Installation and operating instructions Wilo-Yonos PICO 5
en
• Safety instructions relating to property damage start
with a signal word and are displayed
without a symbol.
Signal words DANGER!
Failure to observe the safety instructions will result in
serious injuries or death!
WARNING!
Failure to follow the instructions can lead to (serious)
injuries!
CAUTION!
Failure to follow the instructions can lead to property
damage and a possible total loss.
NOTE
Useful information on handling the product.
Symbols These instructions use the following symbols:
Personnel
qualifications
Personnel must:
• Be instructed in the locally applicable accident pre-
vention regulations.
• Have read and understood the installation and
operating instructions.
Personnel must have the following qualifications:
• Electrical work must be carried out by an authorised
electrician (in accordance with EN 50110-1).
Danger due to electrical voltage
General danger symbol
Warning of hot surfaces/media
Warning of magnetic fields
Notes

6Wilo SE 03/2017
en
• Installation/dismantling must be carried out by a
qualified technician who is trained in the use of the
necessary tools and mounting materials.
• The product must be operated by persons who are
instructed in the functioning of the complete system.
Definition of “qualified electrician”
A qualified electrician is a person with appropriate techni -
cal education, knowledge and experience who can iden -
tify and prevent electrical hazards.
Electrical work • Electrical work must be performed by a qualified elec-
trician.
• Nationally applicable guidelines, standards and regu-
lations as well as specifications by local energy supply
companies for connection to the local power supply
system must be observed.
• Before commencing work, disconnect the product
from the mains and secure it against being switched
on again.
• The connection must be protected by means of a
residual-current device (RCD).
• The product must be earthed.
• Have defective cables replaced immediately by a
qualified electrician.
• Never open the control module and never remove
control elements.
Obligations of the
operator
• Have all work carried out by qualified personnel only.
• Ensure on-site contact protection from hot com-
ponents and electrical hazards.
• Have defective gaskets and connecting cables replaced.
This device can be used by children from 8 years old as
well as persons with limited physical, sensory or mental
capabilities or lack of experience and knowledge, if they
are supervised or instructed in the safe use of the device
and they understand the dangers that may arise. Chil-
dren are not allowed to play with the device. Cleaning
and user maintenance may not be carried out by children
without supervision.

Installation and operating instructions Wilo-Yonos PICO 7
en
3 Product description and function
Overview Wilo-Yonos PICO (Fig. 1)
1 Pump housing with screwed connections
2 Glandless pump motor
3 Condensate drain openings
(4x around circumference)
4 Rating plate
5Housing screws
6 Control module
7 LED display
8Operating button
9 Wilo-Connector, electrical mains connection
10 Function key
11 Function LED
12 Fault signal LED
Function High-efficiency circulator for hot-water heating sys-
tems with integrated differential pressure control. Con-
trol mode and delivery head (differential pressure) are
adjustable. The differential pressure is controlled via the
pump speed.
Type key
Example: Wilo-Yonos PICO 25/1-6 130
Yonos PICO High-efficiency circulator
25 Screwed connection DN 25 (Rp 1)
1-6 1 = Minimum delivery head in m (adjustable down
to 0.5 m)
6 = Maximum delivery head in m at Q = 0 m³/h
130 Port-to-port length: 130 mm or 180 mm

8Wilo SE 03/2017
en
Technical data
LED display
• Display of the current power consumption in W.
• Display of the setpoint H of the delivery head
(differential pressure) in m.
• Display of selected constant speed
(c1 = I, c2 = II, c3 = III).
• Display of warning and fault signals.
3.1 Controls
Operating button Turn
• Select application/control mode.
• Set setpoint H of the delivery head (differential pres-
sure).
• Select constant rotation speed.
Connection voltage 1 ~ 230 V ± 10 %, 50/60 Hz
Protection class IP See rating plate (4)
Energy efficiency index EEI See rating plate (4)
Fluid temperatures at
max. ambient temperature +40 °C -10 °C to +95 °C
Fluid temperatures at
max. ambient temperature +25 °C -10 °C to +110 °C
Permitted ambient temperature -10 °C to +40 °C
Max. operating pressure 10 bar (1000 kPa)
Min. inlet pressure at +95 °C/+110 °C 0.3 bar/1.0 bar (30 kPa/100 kPa)

Installation and operating instructions Wilo-Yonos PICO 9
en
Function key Press
• Start pump venting function.
• activate pump manual restart.
3.2 Applications/control mode and functions
Radiator heating
system
Recommended for two-pipe heating systems with radi-
ators to reduce the flow noises at the thermostatic
valves.
Variable differential pressure (Δp-v):
The pump reduces the delivery head at a decreasing vol-
ume flow in the pipe network to half.
Electrical energy saving by adjusting the delivery head to
the volume flow requirement and lower flow rates.
Underfloor heating Recommended for underfloor heating.
Or for large-sized pipes as well as all applications with-
out changeable pipe network curve (e.g. storage charge
pumps) as well as single-pipe heating systems with radi-
ators.
Constant differential pressure (Δp-c):
The controller keeps the set delivery head constant
irrespective of the conveyed volume flow.
H max
H
H min
Hs
Q
Hs
1
/2
NOTE
Factory setting: Δp-v, ½ Hmax
H max
H
H min
Hs
Q

10 Wilo SE 03/2017
en
Constant speed Recommended for systems with fixed system resis-
tance requiring a constant volume flow.
Constant speed (I, II, III):
The pump runs uncontrolled in three prescribed fixed
speed stages.
Venting
The pump venting function is activated via the function
key and vents the pump automatically.
The heating system is not vented.
Manual restart
A manual restart is activated via the function key and
deblocks the pump as required (e.g. after a prolonged
standstill during the summer).
4 Intended use
The high-efficiency circulators in the Wilo-Yonos 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.
max
H
min
II
III
I
Q
I II III
NOTE
Only add ready-to-use mixtures to the system.
Do not use the pump to mix the fluid in the
system.

Installation and operating instructions Wilo-Yonos PICO 11
en
Intended use includes observing these instructions and
the data and markings on the pump.
Misuse Any use beyond the intended use is considered misuse
and will result in the loss of all liability claims.
5 Transportation and storage
Scope of delivery • High-efficiency circulator with 2 gaskets
• Wilo-Connector
• Installation and operating instructions
Transport
inspection
Inspect for transportation damage and check complete-
ness immediately after delivery, and claim immediately if
necessary.
Transport and
storage conditions
Protect from moisture, frost and mechanical loads.
Permissible temperature range: -10 °C to +50 °C.
WARNING!
Danger of injury or material damage due to improper
use!
• Never use non-specified fluids.
• Never allow unauthorised persons to perform work.
• Never operate the pump outside of the specified
limits of use.
• Never carry out unauthorised conversions.
• Use authorised accessories only.
• Never operate with phase angle control.

12 Wilo SE 03/2017
en
6 Installation and electrical connection
6.1 Installation
May only be installed by qualified technicians.
Preparation • Choose an installation point that is as easily accessible
as possible.
• Observe the pump's allowable installation
position (Fig. 2), rotate the motor head (2 + 6) if
necessary.
WARNING!
Risk of burns due to hot surfaces!
Pump housing (1) and glandless pump motor (2) may
become hot and result in burns on contact.
• During operation, touch the control module (6) only.
• Allow the pump to cool down before commencing
any work.
WARNING!
Risk of burns due to hot fluids!
Hot fluids can result in scalding. Before installing or
removing the pump, or undoing the housing screws (5),
note the following:
• Allow the heating system to cool down completely.
• Close shut-off devices or drain the heating system.
CAUTION!
An incorrect installation position may damage the pump.
• Select the installation point in line with the allowable
installation position (Fig. 2).
• The motor must always be installed horizontally.
• The electrical connection must never face upwards.

Installation and operating instructions Wilo-Yonos PICO 13
en
• Install shut-off devices upstream and downstream of
the pump to facilitate pump replacement.
• Align the upper shut-off device laterally.
• When installing in the feed of open systems, the
safety supply must branch off upstream of the pump
(EN 12828).
• Complete all welding and brazing tasks.
• Flush the pipe system.
Rotating the motor
head
Rotate the motor head (2 + 6) before installing and con-
necting the pump.
• If necessary, remove the thermal insulation shell.
• Hold the motor head (2 + 6) and unscrew
the 4 housing screws (5).
• Carefully rotate the motor head (2 + 6).
• Observe the allowable installation position (Fig. 2)
and the direction arrow on the pump housing (1).
• Tighten the 4 housing screws (5).
CAUTION!
Leaking water may damage the control module.
• Align the upper shut-off device such that leaking
water cannot drip onto the control module (6).
WARNING!
Risk of fatal injury from magnetic field!
Risk of death for people with medical implants due to
permanent magnets installed in the pump.
• Never remove the rotor.
1
5
2
6
CAUTION!
Damage to the inner gasket leads to leakages.
• Carefully rotate the motor head (2 + 6) without
removing it from the pump housing (1).

14 Wilo SE 03/2017
en
Installing the pump Observe the following points when installing the pump:
• Note the direction arrow on the pump housing (1).
• Install without tension, with glandless pump motor
horizontal (2).
• Place gaskets in the screwed connections.
• Screw on threaded pipe unions.
• Secure the pump with an open-end wrench against
twisting and screw tightly with the piping
• Re-mount the thermal insulation shell, if applicable.
6.2 Electrical connection
The electrical connection may only be performed by a
qualified electrician.
1
2
3
CAUTION!
Insufficient heat dissipation and condensation water
may damage the control module and the glandless
pump motor.
• Do not thermally insulate the glandless pump
motor (2).
• Ensure all condensate drain openings (3) are kept
free.
DANGER!
Danger to life due to electrical voltage!
Immediate danger to life if live components are
touched.
• Before commencing work, switch off the power
supply and secure it against being switched on again.
• Never open the control module (6) and never remove
control elements.

Installation and operating instructions Wilo-Yonos PICO 15
en
Preparation • The current type and voltage must agree with the
specifications on the rating plate (4).
• Maximum back-up fuse: 10 A, slow-blow.
• Only operate the pump with sinusoidal AC voltage.
• Note switching frequency:
- On/off switching operations via mains voltage
≤ 100/24 h.
- ≤ 20/h for a switching frequency of 1 min.
between switching on/off via mains voltage.
• The electrical connection must be made via a fixed
connecting cable equipped with a connector device or
an all-pole switch with a contact opening width of at
least 3 mm (VDE 0700/Part 1).
• Use a connecting cable with a sufficient outer diame-
ter (e.g. H05VV-F3G1.5) to protect against leaking
water and to ensure strain relief at the threaded cable
connection.
• Use a heat-resistant connecting cable where fluid
temperatures exceed 90 °C.
• Ensure that the connecting cable does not make con-
tact with either the pipes or the pump.
CAUTION!
Pulsed mains voltage can lead to damage to electronic
components.
• Never operate the pump with phase angle control.
• When switching the pump on or off using an external
control unit, deactivate any voltage pulsing
(e.g. phase angle control).
• For applications where it is not clear whether the
pump is operated with pulsed voltage, get the
control/system manufacturer to confirm that the
pump is operated with sinusoidal AC voltage.
• Switching the pump on/off via triacs/solid-state
relays must be examined on a case-by-case basis.

16 Wilo SE 03/2017
en
Fitting the
Wilo-Connector
• Disconnect the connecting cable from the power
supply.
• Observe the terminal allocations (PE, N, L).
• Connect and fit the Wilo-Connector (Fig. 3a to 3e).
Connecting the
pump
• Earth the pump.
• Connect the Wilo-Connector (9) to the control
module (6) until it snaps into place (Fig 3f).
Removing the
Wilo-Connector
• Disconnect the connecting cable from the power
supply.
• Remove the Wilo-Connector using a suitable screw-
driver (Fig. 4).
7 Commissioning
Commissioning only by qualified technicians.
7.1 Venting
• Fill and vent the system correctly.
The pump vents automatically when first started.
If the pump does not vent automatically:
• Activate the pump venting function via the function
key, briefly press 1x, LED lights green.
Pump venting function starts after 5 seconds, dura-
tion 10 minutes.
LED display shows bars running from bottom to top.
• To cancel, press the function key for a couple of se-
conds.
1x
NOTE
After venting, the LED display shows the previ-
ously set values of the pump.

Installation and operating instructions Wilo-Yonos PICO 17
en
7.2 Setting the control mode and the delivery head
The size of the displayed house symbols and data for
setting the delivery head are provided as a guide only.
A more detailed calculation for the setting is recom-
mended. The values of the delivery head are displayed in
increments of 0.1 m with the setting.
Radiator heating
system
Variable differential pressure (Δp-v):
• Select the setting range of the application.
• Set setpoint H of the delivery head (variable differen-
tial pressure).
The LED display shows the setpoint H of the delivery
head in m.
Underfloor heating
Constant differential pressure (Δp-c):
• Select the setting range of the application.
• Set setpoint H of the delivery head (constant differ-
ential pressure).
The LED display shows the setpoint H of the delivery
head in m.
H+
H-
Pump Number of radiators
Yonos PICO…/1-4 m 8 12 15
Yonos PICO…/1-6 m 12 15 20
Yonos PICO…/1-8 m 15 20 30
H+
H-

18 Wilo SE 03/2017
en
Constant speed
Constant speed I II III:
• Select the setting range of the constant speed.
• Select speed stage I II or III.
The LED display shows the set speed c1, c2 or c3
according to the characteristic curve.
Completing the
setting
• Do not rotate the operating button for 2 seconds.
• LED display flashes 5 times and changes to the cur-
rent power consumption in W.
8 Decommissioning
Shutting down the
pump
Shut down the pump immediately in case of damage to
the connecting cable or other electrical components.
• Disconnect the pump from the power supply.
• Contact Wilo customer service or a specialist technician.
9 Maintenance
Cleaning • Carefully remove soiling from the pump on a regular
basis using a dry duster.
• Never use liquids or aggressive cleaning agents.
Pump Number of square metres of heated space in m²
Yonos PICO…/1-4 m - 80 120
Yonos PICO…/1-6 m 80 150 220
Yonos PICO…/1-8 m > 220
H+H-
NOTE
All settings and displays are retained if the power
supply is interrupted.

Installation and operating instructions Wilo-Yonos PICO 19
en
10 Faults, causes and remedies
The troubleshooting must only be performed by a
qualified specialist, work on the electrical connection
must only be performed by a qualified electrician.
10.1 Warning signals
• The warning signal is indicated by the LED display.
• Fault signal LED does not light up.
• The pump continues to run with limited output.
• The indicated faulty operating status must not occur
for a prolonged period. The cause must be eliminated.
Faults Causes Remedies
Pump is not
running
although the
power supply is
switched on
Electrical fuse
defective Check fuses
Pump has no
voltage Resolve the power interruption
Pump making
noises Cavitation due to
insufficient suction
pressure
Increase the system pressure within
the permissible range
Check the delivery head and set it to
a lower head if necessary
Building does
not get warm Thermal output of
the heating
surfaces is too low
Increase setpoint
Set control mode to Δp-c
LED Faults Causes Remedies
E07 Generator
operation Water is flowing through the pump hydraulics, but
pump has no mains
voltage
Check mains
voltage
E11 Dry run Air in the pump Check volumetric
flow rate/water
pressure
E21 Overload Sluggish motor, pump is
operated outside of its
specifications (e.g. high
module temperature). The
speed is lower than during
normal operation.
Check the ambient
conditions