Wilo Stratos PARA-C User manual

Pioneering for You
Wilo-Stratos PARA-C/-CZ
2226924 • Ed.01/2023-04
en Installation and operating instructions

Fig.I a:
Fig.I b:

Fig. II

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 5
Table of contents
1 About these instructions.................................. 6
2 Safety ................................................................. 6
2.1 Identification of safety instructions....... 6
2.2 Personnel qualifications........................... 7
2.3 Electrical work ........................................... 8
2.4 Operator responsibilities.......................... 9
2.5 Safety instructions..................................10
3 Transport and temporary storage ................. 11
3.1 Transport inspection...............................11
3.2 Transport and storage conditions.........11
4 Intended use and misuse ................................ 12
4.1 Heating fluids........................................... 12
4.2 Use in applications with coolants .........12
4.3 Domestic hot water ................................13
4.4 Misuse.......................................................14
5 Product information ....................................... 14
5.1 Type key ...................................................14
5.2 Equipment variants.................................15
5.3 Technical data..........................................16
5.4 Scope of delivery.....................................17
5.5 Accessories ..............................................17
6 Description and function................................ 17
6.1 Description of the pump ........................17
6.2 Control and communication functions
...................................................................18
7 Installation and electrical connection........... 21
7.1 Installation................................................22
7.2 Electrical connection ..............................25
8 Commissioning ................................................ 27
8.1 Filling and venting...................................28
8.2 Setting the control mode.......................28
8.3 Operation of the pump in the case of ex-
ternal flow ................................................29
9 Maintenance .................................................... 29
9.1 Product life cycle.....................................29
9.2 Shutdown .................................................29
9.3 Dismantling/installation.........................30
10 Faults, causes and remedies........................... 31
10.1 Troubleshooting......................................31
10.2 Error messages .........................................32
11 Spare parts........................................................32
12 Disposal.............................................................32
12.1 Information on the collection of used
electrical and electronic products .........32

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6 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
1 About these instructions
These instructions are an integral part of the product. Adherence to these instructions is a requirement for
the intended use and correct operation of the product:
•Read these instructions before commencing any work and keep them in an accessible place at all times.
•Observe instructions and labelling on the pump.
•Observe local regulations where the pump is installed.
•No liability will be accepted for damage resulting from failure to follow these instructions.
The language of the original operating instructions is German. All other languages of these instructions are
translations of the original operating instructions.
2 Safety
This chapter contains basic instructions for the individual life cycles
of the product. Failure to observe this information carries the follow-
ing risks:
•Danger to persons from electrical, mechanical and bacteriological
effects as well as electromagnetic fields
•Environmental damage from discharge of hazardous substances
•Damage to property
•Failure of important product functions
•Failure of required maintenance and repair procedures
Failure to observe the instructions will result in the loss of any claims
for damages.
The directions and safety instructions in the other sections must
also be observed!
2.1 Identification of safety instructions
These installation and operating instructions set out safety instruc-
tions for preventing personal injury and damage to property, which
are displayed in different ways:
•Safety instructions relating to personal injury start with a signal
word and are preceded by a corresponding symbol.
•Safety instructions relating to property damage start with a signal
word and are displayed without a symbol.

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 7
Signal words
•DANGER!
Failure to follow the instructions will result in serious injury or
death!
•WARNING!
Failure to follow instructions can lead to (serious) injury!
•CAUTION!
Failure to follow instructions can lead to property damage and pos-
sible total loss.
•NOTICE!
Useful information on handling the product
Symbols
These instructions use the following symbols:
General danger symbol
Danger of electric voltage
Warning of hot surfaces
Warning of magnetic fields
Notices
2.2 Personnel qualifications
Personnel must:
•Be instructed about locally applicable regulations governing acci-
dent prevention.
•Have read and understood the installation and operating instruc-
tions.
Personnel must have the following qualifications:
•Electrical work: Electrical work must be performed by a qualified
electrician.

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8 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
•Installation/dismantling work: The installation/dismantling must be
carried out by a qualified technician who is trained in the use of the
necessary tools and fixation materials.
•The product must be operated by persons who are instructed on
how the complete system functions.
•Maintenance tasks: The technician must be familiar with the use of
operating fluids and their disposal.
Definition of “qualified electrician”
A qualified electrician is a person with appropriate technical educa-
tion, knowledge and experience who can identify and prevent elec-
trical hazards.
The operator must confirm and ensure the field of authority, the
competence and the monitoring of the personnel. If the personnel do
not possess the necessary knowledge, they must be trained and in-
structed. If required, this can be carried out by the product manufac-
turer at the operator’s request.
2.3 Electrical work
•Electrical work must be performed by a qualified electrician.
•Nationally applicable guidelines, standards and regulations as well
as specifications issued by the 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 secured by means of a residual-current
device (RCD).
•The product must be earthed.
•Have defective cables replaced immediately by a qualified electri-
cian.
•Never open the control module and never remove operating ele-
ments.

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 9
2.4 Operator responsibilities
•Provide installation and operating instructions in a language the
personnel can understand.
•Make sure that personnel are suitably trained for the specified
work.
•Verify the area of responsibility and individual responsibilities of
personnel.
•Provide the necessary protective equipment and make sure that
personnel wear it.
•Ensure that safety and information signs mounted on the device
are always legible.
•Train personnel with regard to the operating principles of the sys-
tem.
•Eliminate risks from electrical current.
•Equip hazardous components (extremely cold, extremely hot, ro-
tating, etc.) with a guard to be provided by the customer.
•Remove leakages of hazardous fluids (e.g. explosive, toxic or hot) in
such a way that no danger is posed to persons or the environment.
Comply with national statutory provisions.
•Keep highly flammable materials at a safe distance from the
product.
•Ensure compliance with the regulations for accident prevention.
•Ensure compliance with local directives or general directives [e.g.
IEC, VDE, etc.] and instructions from local energy supply compan-
ies.
Follow all information that appears on the product and ensure that it
remains permanently legible:
•Warning and hazard notices
•Rating plate
•Direction of rotation arrow/symbol for direction of flow
•Labelling of connections

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10 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
This device can be used by children from 8years of age as well as
people with reduced physical, sensory or mental capacities or lack of
experience and knowledge if they are supervised or instructed on the
safe use of the device and they understand the dangers that can oc-
cur. Children are not allowed to play with the device. Cleaning and
user maintenance must not be carried out by children without super-
vision.
2.5 Safety instructions
Electrical current
DANGER
Electric shock!
The pump is operated electrically. An electric shock may be a danger to life!
•Have only qualified electricians carry out work on electrical com-
ponents.
•Before all work, deactivate the power supply (also SSM if necessary)
and safeguard against accidental switch-on. Work on the pump
may only be started after 5 minutes have elapsed due to the dan-
gerous residual contact voltage.
•Never open control module and never remove operator controls.
•Only operate the pump with intact components and connection
cables.
Magnetic field
DANGER
Magnetic field!
When dismantled, the permanent magnet rotor inside the pump can pose a risk of fatal injury
for people with medical implants (e.g. pacemakers).
•Never remove the motor impeller unit.

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 11
Hot components
WARNING
Hot components!
Pump housing and glandless motor can get hot and cause burns when touched.
•During operation only touch the control module.
•Allow the pump to cool down before commencing any work.
•Keep highly flammable materials away.
3 Transport and temporary storage
3.1 Transport inspection
Immediately after receiving the product:
•Check product for transport damage.
•If transport damage is detected, take the necessary steps with the forwarding agent within the respective
time limits.
3.2 Transport and storage conditions
CAUTION
Risk of material damage!
Incorrect transport and storage can cause damage tothe product.
WARNING
Risk of injury from sodden packaging!
Packaging that has been sodden loses its strength and can cause injury to persons if the
product falls out.
WARNING
Risk of injury from ripped plastic strips!
Ripped plastic strips on the packaging render transport protection void. Products falling out
may cause personal injury.
•The pump and its packaging must be protected against moisture, frost and mechanical damage during
transport and temporary storage.
•Permitted temperature range during transport:

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12 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
–-25°C...+70°C
•Permitted relative humidity during transport:
–+5%…95%
•Store in original packaging.
•Storage of pump with horizontal shaft on a horizontal surface. Observe the packaging icon (top).
•Storage must not exceed the six-month period.
•Permitted temperature range during storage:
–-20°C...+60°C
•Permitted relative humidity during storage:
–+5%…95%
4 Intended use and misuse
WARNING
The Wilo-Stratos PARA-C series do not meet the requirements of the ATEX directive and are
not suitable for use in ATEX applications!
4.1 Heating fluids
The high-efficiency circulators in the Wilo-Stratos PARA-C series are exclusively intended for circulating
fluids in hot-water heating systems and similar systems, including solar installations, with constantly chan-
ging volume flows.
Permitted fluids:
•Heating water in accordance with VDI2035 Part1 and Part2, within the following limits:
–Electrical conductivity in the range of 10µS/cm to 100µS/cm
–pH value in the range of 8.2 to 10.0
•Water-glycol mixtures, max. mixing ratio of 1:1. If glycol is added, the pumping data of the pump must be
corrected according to the higher viscosity, depending on the mixing ratio percentage.
4.2 Use in applications with coolants
The Wilo-Stratos PARA-C can be used as a device in heat pumps or air-conditioning systems designed in
accordance with IEC60335-2-40. The permitted flammable refrigerants are limited to those listed as com-
patible according to IEC60335-2-40:2018-01.
Coolant
Name
Safety class Max. permissible
surface temper-
ature according to
IEC60335-2-40:20
18-01
(°C)
Stratos PARA-C
Pictogram on the pump:
R-32 A2L 700 Compatible
R-50 A3 545 not permitted
R-142b A2L 650 not permitted
R-143a A2L 650 not permitted
R-152a A2 355 not permitted

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 13
Coolant
Name
Safety class Max. permissible
surface temper-
ature according to
IEC60335-2-40:20
18-01
(°C)
Stratos PARA-C
Pictogram on the pump:
R-170 A3 415 not permitted
R-E170 A3 135 not permitted
R-290 A3 370 not permitted
R-444B A2L 700 Compatible
R-444A A2L 700 Compatible
R-447B A2L 700 Compatible
R-451A A2L 700 Compatible
R-451B A2L 700 Compatible
R-452B A2L 700 Compatible
R-454A A2L 700 Compatible
R-454B A2L 700 Compatible
R-454C A2L 700 Compatible
R-457A A2L 700 Compatible
R-600 A3 265 not permitted
R-600a A3 360 not permitted
R-1270 A3 355 not permitted
R-1234yf A2L 700 Compatible
R-1234ze(E) A2L 700 Compatible
NOTICE
For the most common refrigerants, there is an additional pictogram on the product rating
plate to enable fast identification of the possible use of the product:
- R32:
4.3 Domestic hot water
Domestic hot water
The high-efficiency circulators in the Wilo-Stratos PARA-CZ series are suitable for use in domestic hot wa-
ter circulation systems and other drinking water applications. In drinking water applications, the water tem-
perature must not exceed 80°C.
A list of certificates can be found in the certificate booklet.

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14 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
Intended use includes compliance with these instructions as well as the information and markings on the
pump.
Any use beyond the intended use is considered misuse and will result in the loss of all liability claims.
4.4 Misuse
WARNING
Misuse of the pump can lead to dangerous situations and damage!
Non-permitted substances in the fluid can destroy the pump! Abrasive solids (e.g. sand) in-
crease pump wear.
•Never use non-specified fluids.
•Highly flammable materials/fluids should always be kept at a safe distance from the product.
•Never allow unauthorised persons to carry out work.
•Never operate the pump beyond the specified limits of use.
•Never carry out unauthorised conversions.
•Use exclusively authorised accessories and authorised spare parts.
•Never operate with phase angle control.
5 Product information
5.1 Type key
Example: Wilo-Stratos PARA-C 25-180-12-T01 3,2-3H-C4-AI
Stratos PARA High-efficiency circulator
-C
-CZ
General fields of application, heating, solar application
Domestic hot water applications
25 Screwed connection:
25 = DN25 (Rp1/G1½)
30 = DN30 (Rp1¼/G2)
180 Port-to-port length in [mm]
12 Maximum pump pressure in metres in water column
T01 Equipment variants (note table “Equipment variants”)
3.2 OPTIONAL: Cable length in [m], if different from standard value
not specified: Cable length 1.5m
3H OPTIONAL: Position of the electronic module, if not standard:
not specified: 6H = 6O’clock between discharge port and cable
3H = 3O’clock between discharge port and cable
9H = 9O’clock between discharge port and cable
12H = 12O’clock between discharge port and cable

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 15
Example: Wilo-Stratos PARA-C 25-180-12-T01 3,2-3H-C4-AI
-C4 OPTIONAL: Factory setting
not specified: Operating button in position “Ext. In”
C4 = operating button in position Δp-c 4 m
V3 = operating button in position Δp-v 3 m
...
AI OPTIONAL: Packaging type
not specified: Combined packaging
A = Accessories are included in the packaging
I = Individual packaging
Table1: Type key
5.2 Equipment variants
Type
no.
Operating but-
ton
Internal control
Δp-v
Internal control
Δp-c
External control
function
SSM
(collective
fault signal)
T01 ● ● ● Analogue 0…10V
with cable break
function
●
T02 ● ● ● Analogue 0…10V
without cable break
function
●
T03 ● ● ● Minimum speed*-
T06 - - - Analogue 0…10V
with cable break
function
●
T08 - - - Analogue 0…10V
without cable break
function
●
T10 - - - PWM1 -
T11 - - - PWM2 -
T12 - - - PWM1 ●
T13 - - - PWM2 ●
T16 ● ● ● Analogue 0…10V
with cable break
function
-
T17 ● ● ● Analogue 0…10V
without cable break
function
-
T18 - - - Analogue 0…10V
with cable break
function
-

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16 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
Type
no.
Operating but-
ton
Internal control
Δp-v
Internal control
Δp-c
External control
function
SSM
(collective
fault signal)
T19 - - - Analogue 0…10V
without cable break
function
-
T20 ● ● ● PWM1 -
T21 ● ● ● PWM2 -
T22 ● ● ● PWM1 ●
T24 ● ● ● PWM2 ●
T26 - - - Maximum speed*-
T27 ● ● ● Pump stops*-
T28 ● ● ● Maximum speed*-
*The pump follows this setting when the button is set to “Ext. In”. In this case, the pump is not externally
controlled.
Table2: Equipment variants
5.3 Technical data
Technical data
Connection voltage 1~230V +10%/-10%, 50/60Hz
Protection class IPX4D
Insulation class F
Energy efficiency index EEI See rating plate (Fig.I, Item7)
Permissible fluid temperature -20°C…+95°C (+110°C with reduced performance)
Permissible fluid temperature for domestic hot
water
0°C...+80°C
Permissible ambient temperature -20°C…+40°C (+60°C with reduced performance)
Max. operating pressure 10bar (1000kPa)
Emissions sound-pressure level <38dB(A)1)
Max. installation height 2000m above sea level
Minimum inlet pressure at +95°C/+110°C 1.0bar/1.6bar (100kPa/160kPa)2)
1) with regard to the best efficiency point within the design conditions.
2)The values apply up to 300 m above sea level, addition for higher locations: 0.01bar/100m increase in
height.
Table3: Technical data

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 17
NOTICE
See Wilo’s technical product catalogue for detailed product features.
5.4 Scope of delivery
•High-efficiency circulator
•Installation and operating instructions
5.5 Accessories
Accessories must be ordered separately. For a detailed list and description, consult the catalogue.
The following accessories are available:
•Thermal insulation shell for heating systems
•Thermal insulation shell for cooling systems
6 Description and function
6.1 Description of the pump
The Wilo-Stratos PARA-C high-efficiency circulators (Fig.I) are glandless pumps consisting of highly effi-
cient hydraulics, an electronically commutated motor (ECM) with a permanent magnet rotor and integrated
differential pressure control. An electronic control module with an integrated frequency converter is on the
motor housing. Control mode and delivery head (differential pressure) are adjustable. The differential pres-
sure is controlled via the pump speed.
Overview
Item Name
1 Pump housing with screwed connections
2 Glandless motor
3 Condensate drain openings (4x around circumference)
4 Housing screws
5 Control module
6 Operating button for pump adjustment
7 Rating plate
8 Setting range Ext. In
9 Constant differential pressure (Δp-c) setting range
10 Variable differential pressure (Δp-v) setting range
11 Signal cable connection
12 Mains cable connection

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18 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
6.2 Control and communication functions
Variable differential pressure Δp-v
H max
H
H min
Hs
Q
Hs
1
/
2
Recommended for two-pipe heating systems with radiators 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. Elec-
trical energy saving by adjusting the delivery head to the volume flow requirement and lower flow rates.
Constant differential pressure Δp-c
H max
H
H min
Hs
Q
Recommended for underfloor heating or for large-sized pipes or all applications without a variable pipe net-
work curve (e.g. storage charge pumps) as well as single-pipe heating systems with radiators. The control
keeps the set delivery head constant irrespective of the pumped volume flow.
Constant speed
H
n s
n max
n min
Q
Recommended for systems with fixed system resistance requiring a constant volume flow. The control keeps
the set speed constant, irrespective of the pumped volume flow.

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Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04 19
PWM in type 1
In PWM1 mode, the pump speed is controlled depending on the PWM input signal. Behaviour when a cable
breaks:
If the signal cable is disconnected from the pump, e.g. due to a cable break, the pump accelerates to maxi-
mum speed.
max
n/¹/min
min
0 5 85 88 93 100 PWM %
PWM1 signal input (%) Pump reaction
<5 Pump runs at maximum speed.
5…85 The speed of the pump decreases linearly from nmax to nmin.
85…93 (operation) Pump runs at minimum speed (operation).
85…88 (starting) Pump runs at minimum speed (starting).
93…100 Pump stops (standby).
PWM in type 2
In PWM 2 mode, the pump speed is controlled depending on the PWM input signal. Behaviour when a cable
breaks:
If the signal cable is disconnected from the pump, e.g. due to a cable break, the pump stops.
max
min
0 7 12 15 95 100 PWM %
n/¹/min

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20 Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
PWM2 signal input (%) Pump reaction
<7 Pump stops (standby).
7…15 (operation) Pump runs at minimum speed.
12…15 (starting) Pump runs at minimum speed.
15…95 The speed of the pump increases linearly from nmin to nmax.
>95 Pump runs at maximum speed.
Control input “Analogue In 0…10V” with cable break function
The pump is controlled according to an analogue signal in the range of 0…10V. Behaviour when a cable
breaks: If the signal cable is disconnected from the pump, e.g. due to a cable break, the pump reduces to
minimum speed.
nmax
n/ 1/min
nmin
Off
123 10 U/V
0,5
Analogue signal input (V) Pump reaction
<0.5 Pump runs at minimum speed (emergency operation).
0.5…1 Pump stops.
1…3 (operation) Pump runs at minimum speed.
2…3 (starting) Pump runs at minimum speed.
3…10 The speed of the pump increases linearly from nmin to nmax.
Control input “Analogue In 0…10V” without cable break function
The pump is controlled according to an analogue signal in the range of 0…10V. Behaviour when a cable
breaks: If the signal cable is disconnected from the pump, e.g. due to a cable break, the pump stops.