IVAR SFWC User manual

Fresh Water Controller SFWC
Installation and operating instructions
Read carefully before installation, commissioning and operation

Contents
A. - Safety Instructions 3
A.1. - EC declaration of conformity 3
A.2. - General instructions 3
A.3. - Explanation of symbols 3
A.4. - Changes to the unit 4
A.5. - Warranty and liability 4
B. - Description of Controller 5
B.1. - Specications 5
B.2. - Temperature resistance table 5
B.3. - About the controller 6
B.4. - Scope of supply: 6
B.5. - Disposal and pollutants 6
B.6. - Hydraulic variants 7
C. - Installation 8
C.1. - Wall installation 8
C.2. - Electrical connection 9
C.1. - Installing the temperature sensors 11
D. - Terminal connection diagrams 12
E. - Operation 13
E.1. - Display and input 13
E.2. - Menu sequence and menu structure 14
F. - Parametrisation 15
F.1. - Commissioning help 15
F.2. - Free commissioning 15
F.3. - Calibration 16
1. - Measurements 17
2. - Statistics 18
2.1. - Operating hours 18
2.2. - Heat output 18
2.3. - Graphic overview 18
2.4. - Error messages 18
2.5. - Reset / clear 18
3. - Operating Mode 19
3.1. - Automatic 19
3.2. - Manual 19
3.3. - Off 19
4. - Settings 20
4.1. - Tset 20
4.2. - Tmax 20
4.3. - VFS -Type 20
4.4. - Circulation 21
4.4.1. - Circulation 21
4.4.2. - Circ. Tmin. 21
4.4.3. - Circ. hysteresis 21
4.4.4. - Circ. maximum Flow rate 21
4.4.5. - Circulation period 22
4.4.6. - Tap support 22
4.4.7. - Min storage temp 22
4.4.8. - Tap support calibration 22
4.10. - Comfort 22
5. - Protections / Protective functions 23
5.1. - Antilegionella 23
5.2. - Limescale Protection 24
5.3. - Discharge Protection 24
5.4. - Seizing Protection 24
6. - Special Functions 25
6.1. - Pump menu 25
6.1.1. - Type of pump 25
6.1.2. - Pump 25
6.1.3. - Output Signal 25
6.1.4. - 0-10V off / PWM off 25
6.1.5. - 0-10V on / PWM on 26
6.1.6. - 0-10V Max / PWM Max 26
6.1.7. - Show signal 26
6.2. - Speed control R1 / R2 27
6.2.1. - Max. speed 27
6.2.2. - Min. speed 27
6.3. - Relay functions 27
6.3.1. - Always on 27
6.3.2. - Circulation 27
6.3.3. - Parallel operation V1 27
6.4. - Sensor calibration 28
6.5. - Commissioning 28
6.6. - Factory settings 28
6.7. - Time & Date 28
6.8. - Daylight saving time 29
6.9. - Sleep mode 29
6.10. - Temperature unit 29
7. - Menu Lock 30
7.1. - Menu lock 30
7.2. - Expert mode 30
8. - Service Values 31
9. - Language 32
Z.1 Malfunctions with Error Messages 33
Z.2 Replacing the Fuse 34
Z.3. Maintenance 35

3
Safety Instructions
A.1. - EC declaration of conformity
By af xing the CE mark to the unit the manufacturer declares that the SFWC conforms to
the following relevant safety regulations:
- EC low voltage directive 2006/95/EC
- EC electromagnetic compatibility directive 2004/108/EC
Conformity has been veri ed and the corresponding documentation and the EC declaration
of conformity are kept on  le by the manufacturer.
A.2. - General instructions
It is essential that you read this!
These installation and operating instructions contain basic instructions and important infor-
mation regarding safety, installation, commissioning, maintenance and the optimal use of the
unit. Therefore these instructions must be read completely and understood by the installation
technician/ specialist and by the system user before installation, commissioning and opera-
tion of the unit.The valid accident prevention regulations, VDE regulations, the regulations
of the local power utility, the applicable DIN-EN standards and the installation and operating
instruction of the additional system components must also be observed. The controller does
not under any circumstances replace any safety devices to be provided by the customer!
Installation, electrical connection, commissioning and maintenance of the unit may only be
carried out by specialists who possess the appropriate training.
For the user: Make sure that the specialist gives you detailed information on the function and
operation of the controller. Always keep these instructions in the vicinity of the controller.
A.3. - Explanation of symbols
Caution
Information which is especially important for the function and optimal use of
the unit and the system.
Caution
Failure to observe these instructions can result in destruction of
the unit or the system, or damage to the environment.
Danger
Failure to observe these instructions can result in serious damage
to health such as scalding, or even life-threatening injuries.
Failure to observe these instructions can result in danger to life from electric
voltage.
Danger

4
A.4. - Changes to the unit
A.5. - Warranty and liability
The controller has been manufactured and tested with regard to high quality
and safety requirements. The unit is subject to the statutory guarantee period
of two years from the date of sale.
The warranty and liability shall not include, however, any injury to persons or
material damage that is attributable to one or more of the following causes:
- Failure to observe these installation and operating instructions
- Improper installation, commissioning, maintenance and operation
- Improperly executed repairs
- Unauthorised structural changes to the unit
- Installation of additional components that have not been tested together with the unit
- Any damage resulting from continued use of the unit despite an obvious defect
- Failure to use original spare parts and accessories
- Use of the device for other than its intended purpose
- Operation above or below the limit values listed in the speci cations
- Force majeure
- Changes, additions to or conversion of the unit are not permitted without the written permis-
sion from the manufacturer
- It is likewise forbidden to install additional components that have not been tested together
with the unit
- If it becomes clear that safe operation of the unit is no longer possible, for example because
of damage to the housing, then turn the controller off immediately
- Any parts of the unit or accessories that are not in perfect condition must be exchanged
immediately
- Use only original spare parts and accessories from the manufacturer.
- Markings made on the unit at the factory must not be altered, removed or made illegible
- Only the settings actually described in these instructions may be made on the controller
Safety instructions
Danger
Changes to the unit can compromise the safety and function of the
unit or the entire system.

5
Description of controller
B.1. - Specications
B.2. - Temperature resistance table for Pt1000 sensors
°C 0 10 20 30 40 50 60 70 80 90 100
Ω1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
Electrical specications:
Mains voltage 230VAC +/-10%
Mains frequency 50 - 60Hz
Power consumption 1,5W - 2,0W
Internal fuse 2A slow blow 250V
Protection category IP40
Protection class II
Overvoltage Category II
Degree of Pollution Category II
mechanisches Relais 460VA für AC1 / 460W für AC3 1
0-10V output, tolerance 10%, 10 k Ω load or
PWM output freq. 1 kHz, level 10 V
1
PT1000 sensor input measuring range -40°C to 300°C 2
Permissible cable length of sensors and appliances:
Sensor S1 and S2 <10m
PWM / 0...10V <3m
mechanical relay <10m
VFS <3m
Permissible ambient conditions:
Ambient temperature
for controller operation 0°C...40°C
for transport/storage 0°C...60°C
Air humidity
for controller operation max. 85% rel. humidity at 25°C
for transport/storage no moisture condensation permiddled
Other specications and dimensions
Housing design 2-part, ABS plastic
Installation methods Wall installation, optionally panel installation
Overall dimensions 115mm x 86mm x 45mm
Aperture dimensions 108mm x 82mm x 25.2mm
Display Fully graphical display, 128 x 128 dots
Operation 4 entry keys

6
B.3. - About the controller
The Fresh water controller SFWC facilitates ef cient use and function control through of
your fresh water system. Tap water temperature is regulated fast and precise. The device is
impressive most of all for its functionality and simple, almost self-explanatory operation. For
each step in the input process the individual entry keys are assigned to appropriate func-
tions and explained. The controller menu contains headwords for the measured values and
settings, as well as help texts or clearly-structured graphics.
Important characteristics of the SFWC:
- Depiction of graphics and texts in a lighted display
- Simple viewing of the current measurement values
- Analysis and monitoring of the system by means of statistical graphics,etc.
- Extensive setting menus with explanations
- Menu block can be activated to prevent unintentional setting changes
- Resetting to previously selected values or factory settings
B.4. - Scope of supply:
- Fresh water controller SFWC
- replacement fuse 2A slow-blow
- Installation and operating instructions SFWC
Optionally contained depending on design/order:
- Pt1000 temperature sensor and Vortex Flow Sensor
B.5. - Disposal and pollutants
The unit conforms to the European RoHS directive 2011/65/EU for the restriction of the use
of certain hazardous substances in electrical and electronic equipment.
Caution
The unit must not under any circumstances be disposed of with ordinary
household refuse. Dispose of the unit only at appropriate collection points or
ship it back to the seller or manufacturer.
Description of controller

7
B.6. - Hydraulic variants
Description of controller
The following illustrations should be viewed only as schematic diagrams
showing the respective hydraulic systems, and do not claim to be complete.
The controller does not replace safety devices under any circumstances.
Depending on the speci c application, additional system components and
safety components may be mandatory, such as check valves, non-return
valves, safety temperature limiters, scalding protectors, etc., and must there-
fore be provided.
Caution
Basic scheme Additional function circulation

8
Installation
C.1.1
C.1.2
C.1 Wall installation
1.Unscrew cover screw completely
2.Carefully pull upper part of housing from
lower part.
3.Set upper part of housing aside, being
sure not to touch the electronics when
doing so.
4. Hold the lower part of the housing
(C.1.2) up to the selected position and
mark the 2 mounting holes. Make sure
that the wall surface is as even as possi-
ble so that the housing does not become
distorted when it is screwed on.
5. Using a drill and size 6 bit, drill 2 holes
at the points marked on the wall and push
in the plugs. Also possible is the installati-
on with 4 drill holes.
6. Insert the upper screw and screw it in
slightly.
7. Fit the upper part of the housing and
insert the other screws.
8. Align the housing and tighten the
screws.
Caution
Install the controller only in dry areas and under the ambient conditions
described under 2.1 “Speci cations”. Carry out the following steps:

9
Installation
Caution
Danger
Caution
Caution
C.2 Electrical connection
Before working on the unit, switch off the power supply and secure
it against being switched on again! Check for the absence of power!
Electrical connections may only be made by a specialist and in
compliance with the applicable regulations.
Do not use the controller if the housing shows visible damage.
Low-voltage cables such as temperature sensor cables must be routed
separately from mains voltage cables. Feed temperature sensor cables
only into the left-hand side of the unit, and mains voltage cables only
into the right-hand side.
The customer must provide an all-pole disconnecting device, e.g. a
heating emergency switch.
The cables being connected to the unit must not be stripped by more
than 55mm, and the cable jacket must reach into the housing just to the
other side of the strain relief.
We recommend the use of  exible cables to ease the installation in the
clamp room.
Caution
1.Select necessary program/hydraulics
(see section D)
2. Strip cables by 55mm max., insert,  t
the strain relief devices, strip the last
9-10 mm of the wires. (Fig. C.2.1)
3.Open controller as described under  g.
C.1.1, insert cables and install strain
reliefs
4.Install PE terminal block (see  g. 2.1.a).
C.2.1
C.2.1.a

10
Installation
5. Connect the female connector block ‘s
clamp connections as described in the
terminal connection plans. When using
stranded cables, use a small screw dri-
ver and push the orange buttons while
inserting (see  g. C.2.1.c). When using
solid cable or end splice, just push the
cables in (see  g. C.2.1.d).
6. Plug Female connectors into onboard
headers.
7. Hinge the upper part of the casing on
the top of the lower part and close the
casing gently.
8. Fasten with screw.
9. Switch on mains voltage and place
controller in operation.
C.2.1.e
C.2.1.c
C.2.1.d
screw driver
C.2.1.f
To remove the female connector block
from the header, carefully bend the latch
on the header.
Caution: The latch breaks easily.

11
C.1. - Installing the temperature sensors
The controller operates with Pt1000 temperature sensors which are accurate to the
degree, thus ensuring optimal control of system functions.
Position the sensor precisely in the area to be measured!
It is recommended that at least 20 cm of the sensor cable at the sensor are installed inside the
pipe insulation.
Connect the VFS sensors with the matching jacks.
Achtung
Sensor cables for PT1000 can be extended to a maximum of 10m using a
cable with a cross-section of at least 0.75mm².
Sensor cables for the VFS sensor can be extended to 3m.
Make sure that there is no contact resistance!
Example:
Connections and dimensions of the Vortex Flow Sensors VFS2-40
3/4 “ 1 “
10,7 cm
Installation
Achtung
Controller and VFS sensor have to have the same ground potential. The VFS
sensor uses a functional earth connector (PELV). The PE-connector of the
controller has to be connected to the pipe system near the sensor.
The temperature sensor cables must be routed separately from mains voltage
cables, and must not, for example, be routed in the same cable duct!
Caution

12
Installation
D. - Terminal connection diagrams
Danger
Mains side
230VAC
Sensor side
max. 12V
Caution
Mains voltages 230VAC 50-60Hz
Connection in the right-hand terminal
compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R Relay (normally open)
N Mains neutral conductor N
RRelay (normally closed)
The PE protective conductor must be
connected to the PE metal terminal block!
Low voltage max. 12VAC/DC connection in
the left-hand terminal compartment!
Terminal: Connection for:
S1 Circulation (opt.)
S2 Storage (opt.)
V1 0-10V/PWM signal primary pump
- 0-10V/PWM signal
The polarity of the sensors is freely selectable.
Relay connection changes depending on the additional functions selected.
VFS sensor has to be connected to the socket on the circuit board.
*Bridge of the sensor mass to PE protective conductor required (PELV connection).
Caution
* PELV connection

13
The display (1), with its extensive text and graphics
mode, is almost selfexplanatory, allowing easy opera-
tion of the controller.
The LED (2) lights up green when a relay is switched
on.
The LED (2) lights up red when operating mode “Off”
is set.
The LED (2) ashes slowly red in the operating mode
“Manual”.
The LED (2) ashes quickly red when an error is
present.
Entries are made using four keys (3+4), which are as-
signed to different functions depending on the situati-
on. The “esc” key (3) is used to cancel an entry or to
exit a menu. If applicable there will be a request for
conrmation as to whether the changes which have
been made should be saved. The function of each
of the other three keys (4) is shown in the display line
directly above the keys; the right-hand key is general-
ly has a conrmation and selection function.
Examples of key functions:
+/- = enlarge/shrink values
▼/▲ = scroll menu down/up
yes/no = approve/reject
Info = additional information
Back = to previous screen
ok = conrm selection
Conrm = conrm setting
Examples of display symbols:
Pump
(rotates in operation)
Flow meter
heat exchanger
Temperature sensor
Warning/error message
New information available
(1)
(2)
(3)
(4)
Operation
E.1. - Display and input

14
E.2. - Menu sequence and menu structure
The graphics or overview mode appears when no
key has been press for 2 minutes, or when the main
menu is exited by pressing “esc“.
Pressing a key in graphics or overview mode takes
you directly to the main menu. The following menu
items are then available for selection there:
Current temperature values with explanations
Function control of the system with operating hours,
etc.
Automatic mode, manual mode or switch unit off
Set parameters needed for normal operation
Program selection, clock, etc.
Functions to prevent damage to system and user.
Against unintentional setting changes at critical
points
For diagnosis in the event of an error
Operation
1. Measurements
2. Statistics
3. Operating mode
4. Settings
5. Protective functions
6. Special functions
7. Menu block
8. Service Values
9. Language Language selection

15
The  rst time the controller is turned on and after the
language and time are set, a query appears as to wh-
ether you want to parametrise the controller using the
commissioning help or not. The commissioning help
can also be terminated or called up again at any time
in the special functions menu. The commissioning
help guides you through the necessary basic settings
in the correct order, and provides brief descriptions
of each parameter in the display. Pressing the “esc”
key takes you back to the previous value so you can
If you decide not to use the commissioning help, you should make the
necessary settings in the following sequence:
- Menu 6. Special functions - clock, Additional functions
- Menu 4. Settings, complete
Finally, menu 3.2 under operating mode “Manual“ should be used to test the
switch outputs with the consumers connected, and to check the sensor values for plausibility.
Then switch on automatic mode.
look at the selected setting again or adjust it if desired. Pressing the “esc“ more than once
takes you back step by step to the selection mode, thus cancelling the commissioning help.
Finally, menu 3.2 under operating mode “Manual” should be used to test the switch outputs
with the consumers connected, and to check the sensor values for plausibility. Then switch
on automatic mode.
Caution
Observe the explanations for the the individual parameters on the following
pages, and check whether further settings are necessary for your application.
Parametrisation
F.1. - Commissioning help
F.2. - Free commissioning
Caution
Observe the explanations for the the individual parameters on the
following pages, and check whether further settings are necessary
for your application.

16
Parametrisation
When the tap support is activated (during commissioning or in the menu „Circulation“), a calibra-
tion process is started after the commissioning. To ensure the correct operation, calibration is
also scheduled to start on every Sunday at 3:00 AM.
During commissioning, the calibration must not be interrupted.
If the weekly calibration process is not successful after 10 minutes, the process is cancelled
and the controller uses the former calibration values.
Calibration
During the callibration process a text is shown that the ow rate is measured and no tapping
is allowed.
After conrmation the circulation pump is switched off and the controller is waiting until the ow
rate has dropped to 0 L/min.Afterwards only the circulation pump is switched on and after another
60 seconds the ow rate is measured. The display shows a “Please wait” sign.
After another minute, the ow rate is measured again, and the two ow rates are compared.
If the results are identical (+- 1L/min), the result is saved.
If not, the process is started over until either the results match or 10 minutes have passed and
the calibration is cancelled and the former values are used.
F.3. - Calibration

17
The menu “1. Measurement values” serves to dis-
play the currently measured temperatures.
The menu is closed by pressing “esc” or selecting
“Exit measurement values”.
If “Error” appears on the display instead of the measurement value,
then there may be a defective or incorrect temperature sensor.
If the cables are too long or the sensors are not placed optimally, the result may
be small deviations in the measurement values. In this case the display values
can be compensated for by making entries on the controller. Follow the instruc-
tions under 6.4
What measurement values are displayed depends on the selected program,
the connected sensors and the speci c device design.
Caution
1. - Measurement values
Measurement values

18
2. - Statistics
The menu “2. Statistics” is used for function control and
long-term monitoring of the system. The submenus
described under 7.1-7.6 are available.
The menu is closed by pressing “esc” or selecting “Exit
statistics”.
For system data statistics it is essential for the time to be set accurately on the control-
ler. Please note that the clock continues to run for about 24 hours if the mains voltage
is interrupted, and after that has to be reset. Improper operation or an incorrect time
may result in data being cleared, recorded incorrectly or overwritten. The manufacturer
accepts no liability for the recorded data!
Caution
Statistics
2.1. - Operating hours
Display of operating hours of the relays connected to the controller.
2.2. - Heat output
Display of the heat output of the system in KWh
2.3. - Graphic overview
This provides a clearly-organised display of the data listed under 2.1 - 2.2 as a bar graph. Vari-
ous time ranges are available for comparison. The two left-hand keys can be used to page
through the data.
2.4. - Error messages
Resetting and deleting the individual analyses. The function “All statistics” clears all analyses
but not the error messages.
2.5. - Reset / clear
Display of the last 15 errors occurring in the system with indication of date and time.
Caution
Resulting data is only approximate value for function control!

19
3. - Operating mode
In menu “3. Operating modes” the controller can either
be placed in automatic mode, switched off, or placed
in a manual operating mode.
The menu is closed by pressing “esc” or selecting “Exit
operating modes”.
3.1. - Automatic
Operating modes
3.2. - Manual
3.3. - Off
Automatic mode is the normal operating mode of the controller. Only automatic
mode provides proper controller function taking into account the current tempera-
tures and the parameters that have been set! After an interruption of the mains
voltage the controller automatically returns to the last operating mode selected!
Caution
When the operating mode “Off” is activated, all controller functions are switched
off. The measured temperatures are still displayed to provide an overview.
Caution
When operating mode “Manual” is activated, the current temperatures and the
selected parameters are no longer considered. There is a danger of scalding or
serious damage to the system. The operating mode “Manual” may only be used
by specialists for brief function tests or during commissioning! The relay and thus
the connected consumer are switched on and off by pressing a key, with no regard
to the current temperatures and the parameters which have been set. The mea-
sured temperatures are also shown to provide an overview and function control.
Danger

20
4. - Settings
Caution
This does not under any circumstances
replace the safety facilities to be provided
by the customer!
The menu is closed by pressing “esc” or selecting “Exit
settings”.
The necessary basic settings required for the control
function are made in menu “4. Settings”.
There is a brief description of each adjustable para-
meter shown in the Display. Further the setting ran-
ge and in brackets the default setting is displayed.
4.1. - Tset
Setpoint at VFS sensor
The controller SFWC attempts to reach and maintain a constant temperature in the circulation
by controlling the speed of the hot water pump.
Danger
Temperature values which are set too high can lead to scalding or damage to the
system. Scalding protection must be provided by the customer!
4.2. - Tmax
Maximum tap water temperature at VFS
Maximum allowable temperature at VFS. If Tmax is exceeded, the pump is switched off. If the
temperature drops below Tmax the pump is switched on again.
Settings
4.3. - VFS -Type
Set the type of Vortex Flow Sensors
In this menu the type of Vortex Flow Sensor can be set.