Riello SC ACS 80 User manual

1
ENGLISH
SC ACS 80
The SC ACS 80 is an instantaneous domestic hot water production module that uses the working principle of a stainless
steel plates exchanger.
The setting of the domestic hot water outlet temperature (secondary side) happens with the modulation of the primary
circuit flow rate through a variable flow pump controlled by LFWC controller (PWM control).
The system, which works with a low primary temperature, finds a wide use in thermal solar systems and in underfloor
heating.
3-way mixing valve: estabilishes the inlet water temperature (ideal function for the summer, in which the system exploites
solar thermal panels)
Description Qty.
1 DHW mixer in packing 1
2 Instruction manual 1
3 Circulation pump assembling instructions 1
4 Immersion sensors 2
5 Fuse 1
DESCRIPTION
CONTENTS OF KIT
At the end of its life, the product
should be not be disposed of
as solid urban waste, but rather
it should be handed over to a
differentiated waste collection
centre.
cod. Doc-0100461 - Rev. 1 (06/2021)

2
GENERAL SAFETY INFORMATION AND PRECAUTIONS
READ THIS MANUAL THOROUGHLY BEFORE PERFORMING ANY WORK ON THE PRODUCT.
The manufacturer reserves the right to modify the product without notice for the purpose of introducing technical im-
provements or to facilitate production, installation and positioning. The illustrations in this manual may therefore differ
slightly from the actual product. The safety of the product and the accuracy of the instructions provided are nevertheless
guaranteed.
This manual forms an integral part of the product itself and must be kept in a safe place in order to avoid damage and to
permit rapid consultation throughout the working life of the product.
Ideally, this manual should be kept with the product where it can be consulted whenever needed. The manual should
always accompany the product if sold or transferred to a new owner, or stay with it if the owner moves house and leaves
it behind, so that the next user can consult it.
GENERAL SAFETY INFORMATION
INSTALLATION
Disconnect the product from the mains power supply before commencing any work on it.
The product must be installed in conformity to the laws and standards applicable in the country of installation.
The manufacturer’s responsibility ends with the supply of the product. The product must be installed using best pro-
fessional practices, in conformity to applicable standards, by suitably qualified persons employed by a company that
assumes full responsibility for the completed installation.
The manufacturer cannot be held responsible for consequences deriving from the unauthorised modification of the prod-
uct or from the use of non-original spare parts.
b Do not expose the product to the elements. It is not designed for use outdoors
ELECTRICAL CONNECTIONS
The product must be installed and all electrical connections made by suitably qualified personnel in conformity to appli-
cable standards.
The product’s mains power cable must be connected to a fused, two-pole switch (power supply 230 VAC, 50 Hz). The
product must be correctly connected to ground.
b The product must be connected to the mains power supply via an earth leakage breaker in accordance with appli-
cable standards. Correct functioning is only guaranteed provided the product is used with the pump for which it is
designed. The manufacturer cannot be held responsible for the consequences of improper uses.
WATER CONNECTIONS
On completion of all transport or handling operations, always check the tightness of the water fitting ring nuts.
Take particular care when connecting the product to the water supply. When tightening a fitting, always hold the opposite
fitting steady with a second tool to avoid twisting the copper pipes.
b The product must be installed, connected and tested by suitably qualified persons, in conformity to applicable
standards and in accordance with the instructions provided in the documentation supplied with it. N.B. All pipes
must be insulated in conformity to applicable standards.
It is essential to respect the following precautions when using the product:
- Do not touch hot parts of the product such as the water inlet and outlet pipes. Contact with hot parts can cause painful
burns.
- Do not splash water or any other liquid over the product.
- Do not rest any objects on top of the product.
- Do not expose the product to steam from a cooking hob.
- Do not allow children or inexperienced persons to operate the product.
- Do not touch the product when barefoot or wet.
- Do not pull on the electrical cables.
- Wear protective gloves and safety shoes before handling the product.

3
ENGLISH
1
12
13
8
7
6 6 6
5
4
10
11
8
9
2
3
MAIN COMPONENTS
1 High efficiency pump
2 Black template frame
3 Black handle with red thermometer (primary circuit)
4 Brazed plate iron steel heat exchanger with insulation
5 3-way mixing valve type “TV3” DN25 with electric actuator NRYC230;
6 Ball valve DN25 with nut 1” ½
7 Red handle
8 Blue handle
9 Load / drain tap ½”
10 Manual air vent valve 3/8”
11 Electronic regulator mod. LFWC
12 Vortex flow sensor 5-100 l/min
13 Recirculation kit (separately supplied) composed by: high efficiency pump, Molex cable, ball valve- M-F
3/4”, straight terminal with check valve, PT1000 sensor and sensor pocket, piping and accessories.

4
WATER CIRCUIT
TECHNICAL SPECIFICATIONS
8
2 1
4 5
6
79
9EAFS
3
10
10
10
T
1 High efficiency pump primary circuit
2 3-way mixing valve with electric actuator
3 Plate heat exchanger
4 Sensor pocket
5 Manual air vent valve
6 Ricirculation kit
7 Vortex flow sensor
8 DN25 ball valve with thermometer
9 Load / Drain tap
10 DN25 ball valve
DESCRIPTION SC ACS 80
Thermal power supplied with storage cylinder at 50°C and DHW water delivery at 10-45°C 134 kW
Water draw at 10-45°C with storage cylinder at 50°C 55 l/min
Thermal power absorbed with storage cylinder at 55°C and DHW water delivery at 10-45°C 146 kW
Water draw at 10-45°C with storage cylinder at 55°C 60 l/min
Thermal power absorbed with storage cylinder at 60°C and DHW water delivery at 10-48°C 196 kW
Water draw at 10-48°C with storage cylinder at 60°C 64 l/min
Maximum flow-rate primary 3.600 l/h
Minimum permissible temperature, DHW circuit 2 °C
Maximum operating temperature 90 °C
Maximum operating pressure, primary circuit 6 bar
Opening pressure, primary circuit non-return valves 28 mbar
Opening pressure, DHW circuit non-return valves 28 mbar
Consumption 132 W
Power supply voltage 230 V
Power supply frequency 50-60 Hz
Control unit protection category 40 IP
Net weight 30 kg
Water capacity 19 l

5
ENGLISH
Domestic hot water production graph
NB: Correct functioning of the product is only guaranteed if the primary circuit inlet temperature is at least 5°C higher
than the DHW setpoint.
CHARACTERISTIC CURVES FOR PRIMARY CIRCUIT PUMPS
Q [m3/h]
01 2 3 4
1
2
3
4
5
6
7
8
9
10
11
12
H [m]
Q [l/s]
Q [lgpm]
00,2 0,4 0,6 0,8 1,0 1,2
04 8 12
Q [m3/h]
01 2 3 4
20
40
60
80
100
120
P1[W]
140
160
2m
4m
6m
8m
10m
max.
Produzione ACS (l/min)
Mandata primario (°C)
20
30
50
50
60
70
80
90
100
110
4544 50 55 60 65 70
10÷42 °C
10÷45 °C
10÷48 °C
10÷50 °C
10÷60 °C
10÷55 °C
Primary inlet (°C)
DHW ow rate (l/min)

6
DIMENSIONS AND FITTINGS
70
226
835
MP
8075100
475
100
EAFS
UACS
RP
RS
SC ACS 80
MP - Primary inlet 1" F
RP - Primary outlet (return) 1" F
EAFS - Domestic cold water
inlet 1" F
UACS - DHW outlet 1" F
RS - Recirculation union 3/4” M

7
ENGLISH
(*)
SENSOR SIDE MAIN SIDE 230 VAC
Ma
Ma
Bi
Blue
WIRING DIAGRAM
V1 PWM1 Primary circuit pump
V2 iPWM2 Recirculation pump
S1 PT1000 Recirculation (S1 optional)
S3 PT1000 primary circuit (S3)
S4 Puffer high PT1000
GND Ground
MA phase line L / primary pump
BL Neutral line N / primary pump
(*) Connect to controller terminal VFS1
Main voltages 230VAC / 50-60Hz
Connection on the right part of
the terminal board!
b Main side 230 VAC
Low voltage max. 12VAC/DC
Connection on the left part of
the terminal board!
b Sensor side
b The polarity of the sensors is freely selectable.
b The connection of the ground must be made to the lower part of the terminal (-)
b Protection line PE must be connected to the metal clamp PE!

8
PRELIMINARY CHECKS
Carefully remove the packing and check that the product is complete and undamaged. If any defect or damage is de-
tected, do not install or attempt to repair the product but return it to the retailer. Dispose of packaging in compliance with
applicable law.
b Make sure that the installation position provides easy visibility of and access to the safety valves.
b Connect the safety valves to a drain in conformity to applicable standards.
b Install the product as near as practical to the storage cylinder. The product is designed to work with a pipe length
of 4 metres (inlet and return) between itself and the storage cylinder. Get the storage cylinder away can result in
performance drops in terms of potential and reactivity.
b Disconnect the product from the mains power supply before commencing any work on it.
b The product must be installed in conformity to the laws and standards applicable in the country of installation.
b The manufacturer’s responsibility ends with the supply of the product. The product must be installed in conformity
to applicable standards by suitably qualified persons employed by a company that assumes full responsibility for
the completed installation.
INSTALLATION AND PUTTING INTO SERVICE
Bear in mind the following before installing the product:
- The product is designed to mix domestic hot water from a storage cylinder. Any other use, or any use incompatible with
the product’s technical specifications, is considered improper. Do not connect the product directly to a boiler.
- The product is not designed to be operated by children or persons with limited physical, psychological, sensorial or
mental capacities.
- If the piping needed to connect the product to the water system is damaged, it must be replaced by a suitably qualified
person.
- The installation must comply with all applicable laws and standards.
SYSTEM SCHEMATIC
INSTALLATION
Example of wall mounted installation
Boiler
DHW outlet
Recirculation
Cold water inlet
Primary outlet (return)
Primary inlet
b In case of recirculation, provide a suitably sized expansion tank in order to avoid overpressure due to thermal ex-
pansion and water hammer.

9
ENGLISH
394
15
495
45
D
A
B
C
C
b Installation and connection of the product must be
performed by an authorised, specialist company.
The company installing the product assumes all
responsibility for ensuring that the installation and
functioning of the product conform to applicable
standards.
b The product must be stored in a dry place where it
is not subject to frost. The product must be installed
where it is protected against splashes of water. Am-
bient temperature in the place of installation must
not exceed 40°C during functioning of the product.
b It is advisable to install the product as near as prac-
tically possible to the storage cylinder, in order to
avoid unnecessary heat loss from the connecting
pipes.
INSTALLATION ON THE WALL
b Handle with care!
- Pull out the module from the package and remove the
cover.
- Fix No. 3 plugs (A) on the wall respecting the distance
as shown in rif. (B). Install the module on the the plugs
through the slots (C) on the back of the module. Slide it
down and fix the screws in the plugs.
- Screwing the screws (D)
- Replace the cover
b Check the correct connection of the module. Before
commissioning the module, make sure of the per-
fect tightness of the system. Also, for a good mod-
ule performance, provide for the total air outlet from
the system.

10
WATER CONNECTIONS
CONNECTION TO THE WATER CIRCUIT
b The pipes between the product and the storage cylinder should be kept as short as possible.
b Connect the product to the domestic cold water supply as instructed.
b For domestic hot water production systems, provide a filter to collect impurities to protect the system itself. Provide
an expansion tank, suitably sized, in order to avoid over-pressure due to water hammer and thermal expansion.
If the water supply is harder than 15 °Fr, a suitable treat-
ment system should be installed upstream from the water
heating system to prevent corrosion and the formation of
limescale.
Bear in mind that, because of the low thermal conductivity
of limescale, even deposits of only a couple of millimetres
in thickness can significantly reduce the efficiency of the
water heating system.
The SC ACS 80 hot water mixer is made from materials
that conform to the requirements of Ministerial Decree
174/2004 (Italy) implementing Council Directive 98/83/
EC.
All fittings are assembled in the factory. It is nevertheless
advisable to check their tightness after installing the prod-
uct. It is also necessary to test the product for water tight-
ness at operating pressure when putting it into service.
b Values in excess of those specified in the table
alongside can damage the product and automati-
cally invalidate the warranty. It is therefore important
to analyse the water to ensure that all values are
within the limits given in the table.
WATER PARAMETER UNIT OF
MEASURE
MAXIMUM
PERMISSIBLE
VALUE FOR
COPPER-
BRAZED HEAT
EXCHANGERS
pH 7-9 (indicative of
saturation)
Saturation index (PH
delta) -0.2<0<+0.2
Total hardness °Fr 7-15
Conductivity μS/cm 10…500
Solid substances mg/l <30
Free chlorine mg/l <0.5
Hydrogen sulphide mg/l <0.05
Ammonia mg/l <2
Bicarbonate mg/l <300
Bicarbonate/Hydrogen
sulphide mg/l >1.0
Sulphur mg/l <1
Nitrate mg/l <100
Nitrite mg/l <0.1
Sulphate mg/l <100
Manganese mg/l <0.1
Dissolved iron mg/l <0.2
Free, aggressive car-
bon dioxide mg/l <20
DHW water network must follow the prescriptions of the current legislation.
b In case of recirculation, provide a suitably sized expansion tank in order to avoid overpressure due to thermal ex-
pansion and water hammer.

11
ENGLISH
ELECTRICAL CONNECTIONS
The following instructions are mandatory.
1 Use a multi-pole, magnetic thermal, earth leakage breaker and disconnector that conforms to legislation in the coun-
try of installation.
2 Respect the L (Phase) - N (Neutral) polarity. Keep the ground wire about 2 cm longer than the power wires.
3 Make sure the product is correctly connected to ground.
a It is strictly forbidden to use water pipes to ground the product.
a Do not route the power cable near hot surfaces (like hot water pipes). Use a suitable class of cable if there is any
possibility of contact with parts at temperatures above 50°C.
b The manufacturer declines all responsibility for damage caused by failing to ground the product adequately or by
failure to respect the wiring diagrams provided in this manual.
FILLING PROCEDURE, PRIMARY CIRCUIT
b Fill and bleed the primary circuit with the water at ambient temperature.
- Open the primary circuit inlet and outlet ball valves.
- Set the controller for operation in manual mode (see parameter 3.2).
- Switch on the primary circuit pump.
- Open the vent valve.
- Pump water around the circuit until all air bubbles have been eliminated.
- Close the vent valve.
- Set the controller for operation in automatic mode (see parameter 3.1).
PUTTING INTO SERVICE
b CAUTION! Completely fill the water circuit before putting the product into service.
- Check that the non-return valves are in the right position.
- Fill and bleed the primary circuit.
- Fill the secondary (DHW) circuit.
- Check that the mixer is water-tight.
- Power on the mixer.
- Check that the system works correctly.
b All fittings are assembled in the factory. It is nevertheless advisable to check their tightness after installing the prod-
uct. It is also necessary to test the product for water tightness at operating pressure when putting it into service.
- If there is recirculation, set the parameters as described in the paragraph "DEFAULT PARAMETER SETTINGS TABLE"
on page 26 or in the recirculation manual
- For changes to the parameters, refer to the table on page 26

12
FLUSHING THE HEAT EXCHANGER
- Intercept the flow and close the ball valves ref. C (AFS)
e D (DHW)
- Introduce the fluid from the valve ref. D1
- Spill the fluid from the valve ref. C1 for the necessary
flushing time.
USE AND FUNCTIONS OF THE CONTROLLER
CE Declaration of conformity
Applying the CE mark to the controller, the manufacturer guarantees that the MFWC is in conformity with the following
directives:
- Low Voltage Directive 2006/95/EC
- Electromagnetic Compatibility Directive 2004/108/EC
The conformity of the product has been tested and the pertinent documentation and CE declaration of conformity are
conserved by the manufacturer.
General instructions. Be certain to read the following!
This technical documentation and the accompanying installation and operating instructions contain basic information and
important indications regarding safety, installation, setting, maintenance and optimum use of the controller. Accordingly, the
following instructions must be read and understood by the technician and by the user of the system before installing, setting
and operating the controller. All accident prevention directives, IEC standards, local power utility regulations, pertinent EN
standards and installation and operating instructions accompanying system components must also be observed.
Installation, electrical connection, setting and maintenance of the controller must be carried out only by expert service
technicians in possession of the requisite knowledge. Always keep these instructions in the vicinity of the controller.
Changes to the controller
If changes are made to the controller, the safety and functionality both of the controller and of the entire system may be
adversely affected.
- Changes, additions to or conversion of the unit are forbidden unless written permission is obtained from the manufacturer.
- It is also forbidden to install additional components that have not been tested in conjunction with the controller.
- If safe operation of the controller cannot be guaranteed, for example by reason of damage to any component part, then
switch it off immediately and have it repaired/replaced.
- Any component or accessory of the controller that is not in perfect condition must be replaced immediately.
- Use only original parts and accessories supplied by the manufacturer.
- The manufacturer’s name plate and other factory marks applied to the controller must not be altered, removed or made
illegible.
- Only the settings described in these instructions are able to guarantee the correct operation of the controller.
EAFS
UACS
DC
C1

13
ENGLISH
ABOUT THE CONTROLLER
The MFWC controller enables efficient use and operational control of the mixer system. For each of the single setting
procedures, the keys are assigned to specific functions and explained.
The controller menu contains key words for the measured values and settings, as well as help texts and graphs.
Main features of the MFWC controller:
- Backlit display showing text and graphic content
- Simple viewing of current measurement values
- Analysis and monitoring of the system by means of statistical graphs, etc.
- Extensive setting menus with explanations
- Menu lock: activated to prevent unintentional alteration of settings
- Function allowing restoration of previously selected values or factory settings
- Wide range of additional functions.
DISPOSAL
The unit conforms to the European RoHS directive 2011/65/EU for the restriction of the use of certain hazardous substanc-
es in electrical and electronic equipment.
b 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.
TECHNICAL SPECIFICATIONS
Electrical specications
Voltage.............................................100-230VAC
Frequency ..........................................50 - 60Hz
Consumption ........................................0.5W – 2.5W
- electromechanical relays R1-R3 ........................460VA for AC1 / 460W for AC3
- PMV output freq. 10kHz 10V...........................for 10 kΩ load
Internal fuse.........................................T2A / 250V slow-blow
Ingress protection ....................................IP40
Protection class ......................................II
Sensors ............................................6 x Pt1000 + 2 x VFS (vortex flow sensors)
Measuring range .....................................PT 1000 -40°C up to 300°C
Vortex flow sensor ....................................0°C to 100°C (-25°C /120°C short term)
1 l/min - 12 l/min (VFS1-12) ............................0-0.6 bar
1 l/min – 20 l/min (VFS1-20).............................0-1 bar
2 l/min - 40 l/min (VFS2-40) ............................0-1.6 bar
5 l/min - 100 l/min (VFS5-100) ...........................0-2.5 bar
10 l/min – 200 l/min (VFS10-200).........................0-4 bar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0-6 bar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0-10 bar
Permissible cable length of sensors and appliances
other PT1000 sensors .................................<10m
VFS/RPS Sensoren ...................................<3m
CAN...............................................<3m
PWM / 0...10V .......................................<3m
mechanichal relay ....................................<10m
Real Time Clock
RTC with 24 hour power reserve
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% relative humidity at 25 °C
- for transport/storage .................................no moisture condensation permitted

14
Other specications and dimensions
Housing ............................................3-part, ABS plastic
Overall dimensions ...................................163mm x110mm x 52mm
Installation aperture dimen .............................157mm x 106mm x 31mm
Display ............................................Full graphic display, 128 x 128 pixels
LED ...............................................Multicolour red/green
Programming........................................4 entry keys
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
TERMINAL CONNECTION DIAGRAM
The polarity of the sensors is freely selectable.
Relay connection changes depending on the additional functions selected.
Connection of sensor earths (1-6) via terminal block sensor (-).
VFS sensor has to be connected to the socket on the circuit board.
Sensor 2 / Cold water: If no sensor is connected, a temperature of 10° C is set.
S5 S4 S3 S2 S1 R3PELV R3I R2 R1 LN-V1
CANCAN VFS2 VFS1
V2S6+
Control circuit, max. 12 VAC / DC
Terminal: Connection for:
S1 Recirculation (optional)
S2 Cold water (optional, see box be-
low)
S3 Primary flow (opt.)
S4 Storage top (opt.)
S5 Storage middle (opt.)
V1 0-10V/PWM signal primary pump
V2 0-10V/PWM signal (optional)
S6 Primary outlet (optional)
- Terminal connection sensor -
VFS1 Warm water tap
VFS2 Optional
Power circuit, 230 VAC 50-60 Hz
Terminal: Connection for:
L Live, phase L
N Neutral, phase N
R1 Primary pump (opt.)
R2 Relay 2
R3 Relay 3 (normally open)
R3I Relay 3 (normally open)
The PE (ground) protection wire must be connected to
the metallic PE terminal!
SENSOR TERMINALS
max. 12V
POWER TERMINALS
230 VAC

15
ENGLISH
DISPLAY AND PROGRAMMING
Display
The display (1), with full text and graphics mode, is
self-explanatory to all intents and purposes, making the
controller easy to use.
The LED (2) lights up green when a relay is activated.
The LED (2) lights up red when the operating mode is
"Off".
The LED (2) blinks red slowly when the operating mode
is “Manual”.
The LED (2) blinks red fast when an error occurs.
Commands are entered using four keys (3) and (4), which
are assigned context-sensitive functions. The “esc” key
(3) is used to cancel a command or exit the current menu.
When changes have been made and are applicable, the
controller will prompt for confirmation to save.
The function of each of the other three keys (4) is shown in
the display line immediately above; the right-hand key is
generally used to confirm and select input data.
Examples of key functions:
+/- = increase/decrease values
▲/▼= scroll menu up/down
yes/no = confirm/cancel
Info = additional information
Back = return to previous screen
ok = confirm selection
Confirm = confirm setting
Finally, accessing menu 3.2 and selecting “Manual”
mode, the installer can test the various outputs with the
components connected, and verify whether or not the
readings from the sensors are reliable. This done, auto-
matic mode can be re-activated.
b Observe the indications for individual parameters given on the following pages, and check whether or not further
settings are needed for the particular application.
MENU SEQUENCE AND MENU STRUCTURE
Graphics or "overview” mode will appear if no key is
pressed for a period of 2 minutes, or if "esc" is pressed to
exit the main menu.
Pressing a key in graphics or overview mode takes you
directly to the main menu.
Meaning of symbols in the display:
Pump (revolves with pump in operation)
Flow meter
Heat exchanger
Temperature sensor
Warning / Error message
Information
Valve (black in direction of flow)
Thermostat
esc
(1)
(2)
(3)
(4)
Exit main menu
OK
esc
1.Measured values
2.Statistics

16
The following menus are available
1. Measured values Measured sensor values
2. Statistics Operating hours counters
3. Operating mode Automatic mode, manual mode, or controller Off
4. Settings Management of parameters required for normal operation
5. Protections Functions for preventing damage to the system and injury to users
6. Special functions Program selection, sensor calibration, clock, additional sensor, etc.
7. Menu lock Lock entry against unintentional changes at critical points
8. Service data Operating values
9. Language Language selection
COMMISSIONING HELP
The first time the controller is turned on and after the lan-
guage and time are set, a query appears as to whether
you want to parametrise the controller using the commis-
sioning 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 neces-
sary 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 look at the selected setting again or ad-
just 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 4.2 under operating mode “Manual” should be used to test the switch outputs with the consumers connect-
ed, and to check the sensor values for plausibility. Then switch on automatic mode.
b Observe the explanations for the individual parameters on the following pages, and check whether further settings
are necessary for your application.
Free commissioning
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 5. Settings, complete
Finally, menu 4.2 under operating mode “Manual“ should be used to test the switch outputs with the consumers connect-
ed, and to check the sensor values for plausibility. Then switch on automatic mode.
b Observe the explanations for the individual parameters on the following pages, and check whether further settings
are necessary for your application.
Calibration
When the tap support is activated (during commissioning or in the menu „Circulation“), a calibration process is started af-
ter 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.
During the callibration process a text is shown that the flow rate is measured and no tapping is allowed.
After confirmation the circulation pump is switched off and the controller is waiting until the flow rate has dropped to 0 L/
min. Afterwards only the circulation pump is switched on and after another 60 seconds the flow rate is measured.
The display shows a “Please wait” sign.
After another minute, the flow rate is measured again, and the two flow 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.
Setup wizard
Would you like to start the setup
wizard?
esc
No Yes

17
ENGLISH
1.MEASURED VALUES
Menu “1. Measured values” indicates the current temper-
atures measured. Quit the menu by pressing “esc” or se-
lecting “Exit Measured values”.
b 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 in-
structions under 12.3. What measurement values are displayed depends on the selected program, the connected
sensors and the specific device design.
2. STATISTICS
Use menu “2. Statistics” for function control and long-term
monitoring of the system.
To quit the Statistics menu, press “esc” or select “Exit sta-
tistics”.
b For system data statistics it is essential for the time
to be set accurately on the controller. 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!
2.1 Operating hours HW
Shows the total hours that the relays connected to the controller have been in operation.
2.2 Heat output
Metering of heat produced by the system, in kWh.
b Heat output data are only approximate for control functions
2.3 Graphic overview
Provides a clear overview of the data listed under headings 2.1-2.2 in the form of a bar graph. Various time ranges are
available to allow comparison. Use the two keys on the left to scroll through the data
2.4 Error messages
Shows the last 15 events recorded by the system, indicating the date and time.
2.5 Reset/clear
Resets and deletes single analyses. The “all statistics” function clears all information except for error messages.
1.Exit Measured values
1.1.Hot water 0°C
1.2.Flow rate 0 l/min
esc
2.Exit statistics
2.1.Hours operation
2.2.Accounting
esc
OK

18
3. OPERATING MODE
Menu “3. Operating mode” allows selection of the desired
mode of operation: automatic, off, or manual.
To quit the menu, press “esc” or select “Exit operating
mode”.
3.1 Automatic
Automatic is the normal operating mode of the controller.
Only automatic mode guarantees correct operation of the
system, taking account of the current temperatures and
the selected parameter settings!
When restarted following a mains power failure, the controller will revert automatically to the operating mode last selected!
3.2 Manual
The relay — and the component connected to the relay contacts — are switched on or off by pressing a key, regardless
of current temperatures and parameter settings. Measured temperatures are also displayed on the screen, for monitoring
and control purposes.
b When “Manual" mode is activated, current temperatures and parameter settings are ignored by the controller. In this
situation, the system is liable to overheat and suffer serious damage. “Manual” operating mode must be used only
by an expert for conducting functional tests of short duration, or when setting up the controller!
3.3 Off
b Selecting “Off” mode, all functions of the controller will be deactivated. This should be avoided normally, as it could
cause the solar collector or other system components to overheat, for example. Measured temperatures continue
to be displayed so that the overview remains available.
4. SETTINGS
The parameters essential to normal operation of the con-
troller are presented in menu 4. “Settings”.
b This does not under any circumstances replace the
safety facilities to be provided by the customer!
To quit the menu, press “esc” or select “Exit settings”.
4.1 Tset = Setpoint at VFS sensor
The controller LFWC provides this hot water temperature
(tap temperature) constant and as soon as possible.
4.2 Tmax = Maximum draw-off temperature at the vortex ow sensor
The controller LFWC provides this hot water temperature ( tap temperature ) constant and as soon as possible.
b Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must
be provided by the customer!
4.3 VFS type
Set the type of Vortex Flow Sensors.
In this menu the type of Vortex Flow Sensor can be set.
4.4 Recirculation
4.4.1 Recirculation
When the mode “Request” is active, the circulation pump is switched on after a corresponding tapping of water has
occured and stays on until the circulation target temperature (Circ Tmin + hysteresis) is reached at the circulation sensor.
In mode “Periods” the circulation pump is enabled in the set periods and the set circulation minimum temperature is un-
dershot and stays on until the circulation target temperature (Circ Tmin + hysteresis) is reached at the circulation sensor.
Request+Time: The circulation pump is switched on in the enabled periods and the set circulation minimum temperature
is undershot, or when water is tapped. Circulation stays on till the circulation target temperature (Circ Tmin + hysteresis)
is reached at the circulatiopn sensor.
Always on: Circulation pump is switched on in set periods.
4.4.2 Circ.Tmin. = Minimum temperature at sensor S2
If the temperature drops below Circ.Tmin and the circulation is enabled the circulation pump is started.
3.Exit operating mode
3.1.Auto 
3.2.Manual
esc
Info
4.Exit settings
4.1.Tset 45°C
4.2.Tmax 60°C
esc
Info

19
ENGLISH
4.4.3 Circ. hysteresis = Switch-off hysteresis of the circulation pump
If the temperature exceeds TminS2 by this value, the circulation pump is switched off.
4.4.4 Circ. maximum Flow rate = Maximum ow rate of the circulation pump
If the flow rate measured at sensor 6 exceeds this value (because water is being drained from the system) the circulation
pump is switched off.
4.4.5 Circulation period = Period where the circulation pump is enabled.
TSet the operation times of the circulation pump. 3 different periods can be set for every weekday, which can also be
copied to other days.
b This settings are only available if circulation mode “Periods” or “Request + Time” is choosed.
b In periods not defi ned circulation is inactive. The set periods are only used in the circulation mode “Periods and
“Request + Time””.
4.4.6 Tap support
To ensure a constant temperature even with small amount of tap water, the circulation pump can be used as support
pump. Not only does the circulation pump switch on under normal conditions, but also when a small tapping occurs.
When a storage sensor is connected, tap support is only switched on when the Min storage Temp is reached at the stor-
age sensor.
4.4.7 Minimum storage temperature
Tap support is deactivated when the storage temperature drops below „Min storage temp“.
4.4.8 Tap support calibration
See “F3. - Calibration”.
4.11 Comfort
If this function is activated, the heat exchanger will rinse for 5 seconds every 15 minutes, so that hot water is available as
soon as possible.
5. PROTECTIVE FUNCTIONS
Menu “5. - Protective functions” can be used to set and
activate a number of protective functions.
To quit the menu, press “esc” or select “Exit Protective
functions”.
b This does not under any circumstances replace the
safety facilities to be provided by the customer!
5.1 Anti-legionella
With the AL-function activated, the LFWC makes it pos-
sible to heat the storage in selectable intervals, (AL interval) for the set residence time (AL resid. time), starting at the
set time (AL start time) until the temperature AL Tset is reached. The temperature measured at S5 has a reference of AL
Tset +5 °C. For the time the AL function is active, Tmax is set to AL Tset +10° to prevent system shutdown due to high
temperature.
Only when a temperature of at least „AL Tset“-5 °C is reached at the Hot water sensor and, if present, at the circulation
sensor for the time set in „Al resid. time“, the AL function is regarded as successful. This is displayed as “Last AL heat.”.
If AL is unsuccessful after 2 hours, the attempt is cancelled and will be started again the next day and an error message
is displayed.
b During the Anti-legionella function the storage cylinder is heated to high temperatures that can lead to scalding and
damage to the system.
b The user must make sure that the Anti-legionella function terminates successfully at the set periods.
b The AL function is switched off by default. A message containing the date is shown as soon as the AL function ter-
minates successfully. The AL start time should be set during a period in which little hot water is drawn off.
b The user must make sure that the temperature of the storage cylinder is at AL Tset +5° when starting the AL cycle
manually. If sensor S3 is installed, the AL function will not start until a temperature of AL Tset +5° is reached.
b The AL function does not provide total protection against legionella because is not possible to monitor temperatures
throughout the storage cylinder and in all connecting pipes.
5.2 Limescale protection
To prevent the accumulation of limescale, the circulation pump can continue to rinse the heat exchanger after a tapping
for at least 5 seconds or for longest 30 seconds or till the VFS sensor drops below Tset.
5.Exit protective functions
5.1.Anti-legionella
5.2.Limescale protection
esc
Info

20
5.3 Discharge Protection
If the temperature in the primary circuit is not always guaranteed to suffice, this function is used.
With this function activated:
When no storage sensor is connected:
If the setpoint temperature is not reached after 60 seconds, the currently measured temperature -3°C is used as new
setpoint temperature. Once the pump in the primary circuit stops, the setpoint temperature is raised to the set Tset again.
When the storage sensor is connected
If the temperature at the storage sensor is smaller than Tset -5 °C, the target temperature is lowered to the currently
measured storage temperature -5 °C.
In both cases “Circ Tmin” is lowered to the new setpoint temperature - Circ. hysteresis - 5 °C, where “Circ Tmin is not lower
than 0 °C and not higher than the set Circ Tmin.
5.4 Seizing protection
If seizing protection is active, the controller switches on the relay and the connected components for 5 seconds every
day at 12:00 (“Daily” setting), or every Sunday at 12:00 (“Weekly” setting), in order to prevent the pump and/or the valve
from seizing up after a lengthy idle period.
Settings range: Daily, Weekly, Off / Default: see table.
6. SPECIAL FUNCTIONS
Menu “6. Special functions” is used to set basic items and
expanded functions.
b With the exception of the clock, all settings must be
entrusted solely to expert service technicians. To
quit the menu, press “esc” or select “Exit special
functions”.
b The numbering of the menu items may change from
one system to another.
6.1 Pump menu
This menu contains the settings for 0-10V or PWM pump control.
b The power supply of HE pumps with 0-10V / PWM pumps can be connected to the corresponding relay (V1 -> R1,
R2 -> V2), since the relays are switched on and off with the signal.
6.1.1 Pump type
This menu is used to set the type of pump and speed control.
0-10V: speed control of e.g. High effi cency pumps by 0-10V signal;
PWM: speed control of e.g. High effi cency pumps by PWM signal.
6.1.2 Pump
In this menu, preconfi gured profi les for various pumps can be selected. Please note that individual settings are still
possible even when a profi le has been selected.
6.1.3 Output signal
This menu determines the type of pump used: Solar pumps perform at their highest power when the signal is also maxed,
heating pump on the other hand are set to highest power wenn the control signal is at the lowest. Solar = normal, heating
= Inverted. For 0-10V pump is always to select the “Normal” setting.
6.1.4. 0-10V off / PWM off
This signal / this voltage is put out when the pump is switched off (Pumps that can detect cable break need a minimum
signal).
6.1.5. 0-10V on / PWM on
This signal / this voltage is needed to turn the pump on at minimum speed / minimun voltage.
6.1.6. 0-10V Max / PWM Max
This determines the output signal / the output voltage for the highest speed of the pump, that is used e.g. during purging
or manual operation.
6.1.7. Show signal
Displays the set signal in text and a graphical diagram.
6.2 Speed control
The settings in this menu are used to limit the speed of connected 0-10V and PWM pumps.
6.2.1 Max speed
This is where the maximum speed of the pump is set. During the setting procedure, the pump runs at the selected speed
so that the flow rate can be determined.
b The indicated percentages are guide values that may vary to a greater or
6.Exit special function
6.1.Pump settings V1
6.2.Speed control V1
esc
OK