thermital MODEX ACS 40 E User manual

1
ENGLISH
THERMITAL MODEX ACS 40 E
The ACS 40 E is an instant domestic hot water mixer. It uses a brazed, stainless steel plate heat exchanger and is desi-
gned for use in combination with DHW storage cylinders.
The product is equipped with two filling/drain cocks. When the shut-off valves are closed, these can also be used to flush
out the heat exchanger.
A domestic hot water recirculation kit is available for further convenience.
The ACS 40 E instant hot water mixer comes complete with an insulated frame.
Description Qty.
1 DHW mixer in packing 1
2 Instruction manual 1
DESCRIPTION
CONTENTS OF KIT
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.
cod. Doc-0072219 - Rev. 4 (05/17)

2
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 professio-
nal 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 pro-
duct 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.

3
ENGLISH
1
15
11
12
7
8
13
14
3
11
2
5
10
2
4
9
6
MAIN COMPONENTS
1 Galvanised and internally insulated backplate
2 Ball valve, DN 20 3/4” F – 1” M (primary outlet)
3 Red knob for ball valve with temperature sensor (primary inlet)
4 Blue knob for ball valve with temperature sensor (primary outlet)
5 Pump (primary circuit)
6 Ball valves, DN 20 3/4” F - 1" M (secondary circuit)
7 Red knob for ball valve (DHW outlet)
8 Blue knob for ball valve (cold water inlet)
9 Non-return valve (primary and secondary circuits)
10 Safety valve, 6 bar (secondary circuit)
11 Filling/drain cock, 1/2”
12 Flow meter and temperature sensor (secondary circuit)
13 Brazed, stainless steel, plate heat exchanger
14 Electronic control unit
15 Piping

4
WATER CIRCUIT
TECHNICAL SPECIFICATIONS
EAF
5
9
46
6
3
2
1
110
1
8
7
8
1 Valve with temperature sensor
2 Modulating pump
3 Heat exchanger
4 Flow meter
5 Valve with temperature sensor
6 Non-return valve
7 Manual bleed valve
8 Manual drain valve
9 Recirculation pump (accessory kit)
10 Safety valve
DESCRIPTION ACS 40 E
Thermal power absorbed with storage cylinder at 50°C and DHW water delivery at 10-45°C 72 kW
Water draw at 10-45°C with storage cylinder at 50°C 29,5 l/min
Thermal power absorbed with storage cylinder at 55°C and DHW water delivery at 10-45°C 94,0 kW
Water draw at 10-45°C with storage cylinder at 55°C 38.5 l/min
Thermal power absorbed with storage cylinder at 60°C and DHW water delivery at 10-40°C 92 kW
Water draw at 10-40°C with storage cylinder at 60°C 44 l/min
Maximum flow-rate primary 1850 l/h
Minimum permissible temperature, DHW circuit 2 °C
Maximum operating temperature 90 °C
Maximum operating pressure, primary circuit 10 bar
Opening pressure, primary circuit non-return valves 28 mbar
Opening pressure, DHW circuit non-return valves 28 mbar
Consumption 47 W
Power supply voltage 230 V
Power supply frequency 50-60 Hz
Index of protection 40 IP
Net weight 19,2 kg
Water capacity 6,6 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
00,5 1,01,5 2,02,5 3,0
00,2 0,40,6 0,8
0246810
0
1
2
3
4
5
6
7
0
10
20
30
40
50
60
70
00,5 1,01,5 2,02,5 3,0
0
20
40
3695/ 25
PWM1
4178/ 15
PWM1
4660/ ≤5
PWM1
3213/ 35
PWM1
2730/ 45
PWM1
2248/ 55
PWM1
1765/ 65
PWM1
1283/ 75
PWM1
800/ 85
PWM1
p/kPa
H/m
P1/W
Q/m³/ h
Q/l/s
Q/Igpm
Q/m³/ h
max.
max.
Wilo-Yonos Para RS
15/7.0, 20/7.0, 25/6, 30/7.0
1-230 V - Rp1/2, Rp3/4, Rp1, Rp1 1/4
n=1/min/ % PWM 1
45
40
40 45 50 55 60 65 70 75 80 85
35
30
25
20
Produzione ACS (l/min
)
Mandata primario (°C)
10÷42 °C
10÷45 °C
10÷48 °C
10÷50 °C
10÷55 °C
10÷60 °C
10÷65 °C
Primary inlet (°C)
DHW ow rate (l/min)
00,5 1,01,5 2,02,5 3,0
00,2 0,40,6 0,8
0246810
0
1
2
3
4
5
6
7
0
10
20
30
40
50
60
70
00,5 1,01,5 2,02,5 3,0
0
20
40
800
1
/min
2390
1
/min
3400
1
/min
4660
1
/min
max.
p/kPa
H/m
P
1
/W
Q/m³/ h
Q/l/s
Q/Igpm
Q/m³/ h
max.
Wilo-Yonos Para RS
15/7.0, 25/7.0, 30/7.0
1-230 V - Rp1/2, Rp1, Rp1 1/4

6
DIMENSIONS AND FITTINGS
MP
RS RP EAFS UACS
480
100
807555 45 225
840
ACS 40 E
MP - Primary inlet 1 M - 3/4" F
RP - Primary outlet (return) 1 M - 3/4" F
EAFS - Domestic cold water
inlet 1 M - 3/4" F
UACS - DHW outlet 1 M - 3/4" F
RS - Recirculation union 3/4” M
1” M
3/4” F

7
ENGLISH
WIRING DIAGRAM
S5
S4
(*)
LATO SONDE E CONTROLLO LATO ALIMENTAZIONE 230 V
SENSOR AND CONTROL
TERMINALS 230 V POWER TERMINALS
S4 Storage cylinder top sensor
S5 Storage cylinder bottom sensor
(*) Connect to controller terminal VFS1

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.
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

9
ENGLISH
394
15
45
495
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.
b Handle with care!
- Remove the product from its packaging and remove the
polypropylene cover.
- Drill the wall at the positions shown in the figure and fit
three 12 mm wall plugs. Mount the product on the wall,
inserting the wall plugs through the slots in the rear. Sli-
de the product down until the screws lie at the top of
the slots.
- Tighten the screws on the metal backplate through the
holes in the front of the product as shown in the figure.
- Connect the water pipes according to the schematic in
“System schematic”.
- Check that all connections have been made correctly.
Make sure that the entire system is water tight before
putting the mixer into service. To ensure maximum ef-
ficiency, also make sure that all air has been bled from
the system.
- Fit the cover.

10
WATER CONNECTIONS
CONNECTION TO THE WATER CIRCUIT
K
6
22
1
54
3
7
1 Safety valve
2 Shut-off valve
3 Pressure gauge
4 Non-return valve
5 Pressure reducer valve (necessary for K>=6 bar)
6 Fine mesh filter
7 Expansion vessel (accessory)
K Fitting for domestic cold water supply
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 Install a filter in the domestic hot water circuit to capture impurities and protect the circuit. Also install a non-return
valve and an expansion vessel along the domestic cold water supply.
If the water supply is harder than 25 to 30 °Fr, a suitable
treatment system should be installed upstream from the
water heating system to prevent corrosion and the forma-
tion 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 ACS 40 E 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 neverthe-
less advisable to check their tightness after installing the
product. It is also necessary to test the product for water
tightness at operating pressure when putting it into ser-
vice.
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 15-30
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

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 count-
ry 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 pro-
duct. It is also necessary to test the product for water tightness at operating pressure when putting it into service.

12
FLUSHING THE HEAT EXCHANGER
- Shut off the DHW flow by closing the ball valves (1a)
and (1b) for the cold water inlet and hot water outlet
respectively.
- Attach the flushing fluid supply to the cold water inlet
valve (2b).
- Attach the flushing fluid drain to the DHW outlet valve
(2a). Pump flushing fluid through the heat exchanger
until it is clean.
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.
2b
2a
1a 1b

13
ENGLISH
- 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.
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 controller conforms to the European RoHS directive 2002/95/EC regarding restrictions on the use of certain hazar-
dous substances in electrical and electronic equipment.
b Never under any circumstances dispose of the controller with ordinary household refuse. Dispose of the controller
only at designated collection points or return it to the dealer 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 ........................................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 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
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

14
TERMINAL CONNECTION DIAGRAM
Relay connections will vary depending on what additional functions are selected.
The polarity of the temperature sensors is irrelevant. The common wire should be connected to the bottom (-) terminal strip.
Vortex flow sensors must be connected to the socket on the control panel.
Sensor 2 / cold water: if no sensor is connected, a default 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
S3 Primary circuit flow rate (optional)
S4 Top of storage cylinder
S5
V1 PWM signal, primary circuit pump
V2 0-10V/PWM signal (optional)
S6 Primary outlet (optional)
- Cold water inlet
VFS2 optional
Power circuit, 230 VAC 50-60 Hz
Terminal: Connection for:
L Live, phase L
N Neutral, phase N
R1 Primary circuit pump
R2 Relay 2 (recirculation option)
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 con-
troller 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 re-
adings from the sensors are reliable. This done, automatic
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 pres-
sed for a period of 2 minutes, or if "esc" is pressed to exit
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 Current temperature values with explanations
2. Statistics General system control information, including hours operation, etc.
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 Protection against unintentional setting changes at critical points
8. Service data For diagnosis in the event of errors occurring
9. Language Language selection
1.MEASURED VALUES
Menu “1. Measured values” indicates the current tempe-
ratures measured. Quit the menu by pressing “esc” or se-
lecting “Exit Measured values”.
Selecting “Info”, a short message will appear explaining
the measurement values.
To quit the Info menu, select “Overview” or press “esc”.
b If “Error” appears in the display instead of the me-
asurement value, this could mean that there is a
temperature sensor either faulty or not connected
properly. If the cables are too long or the sensors not positioned correctly, there could be minor deviations in the
measurement values. In this instance, the values displayed can be compensated by making adjustments via the
controller. The temperature measured is the temperature at the outlet of the heat exchanger, which could differ from
that measured at the taps. Small fluctuations in temperature at the taps are compensated generally by mixing water
from the main.
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 To run analyses on system data, the time must be
set correctly at the controller. Remember that in the
event of a power failure occurring, the clock must
be reset. An unsuitable setting or a clock error can
cause data to be deleted, recorded incorrectly, or
overwritten. The manufacturer acknowledges no liability for recorded data.
2.1 Hours operation
Shows the total hours that the relays connected to the controller have been in operation.
2.2 Accounting
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 Message log
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

17
ENGLISH
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”.
To quit the menu, press “esc” or select “Exit settings”.
4.1 Tset
The MFWC controller maintains a constant recirculation
temperature by controlling the speed of the hot water
pump.
4.2 Tmax = Maximum draw-off temperature at the vor-
tex ow sensor
Maximum allowable temperature at the vortex flow sensor. If Tmax is exceeded, the pump is switched off. If the tempera-
ture drops below Tmax, the pump is started again.
b If temperature settings are too high, this could cause scalding or damage to the system. Scalding protection must
be provided by the customer!
4.3 VFS type
This menu sets the type of vortex flow sensor used.
Settings range: 1-12 l/min, 1-20l/min, 2-40l/min, 5-100l/min, 10-200l/min, 20-400l/min / Default: see table.
4.4 Recirculation
4.4.1 Recirculation
When “Request” mode is active, the recirculation pump starts when water is drawn off and continues to run until the target
recirculation temperature (Tmin recirculation + hysteresis) is reached at the recirculation sensor.
In “Periods” mode, the recirculation pump runs during the set times and when temperature is below the minimum recircu-
lation temperature setting and continues to run until the target recirculation temperature (Tmin recirculation + hysteresis)
is reached at the recirculation sensor.
Request+Periods: The pump runs during the set times and when temperature is below the minimum recirculation tempe-
rature setting or when water is drawn off.
The pump continues to run until the target recirculation temperature (Tmin recirculation + hysteresis) is reached at the
recirculation sensor.
Always on: The recirculation pump is always on during the set times.
Settings range: Request, Periods, Request+Periods, Always on / Default: see table.
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

18
4.4.2 Tmin recirculation = Minimum recirculation temperature at sensor S1
Provided recirculation is enabled, if temperature drops below Tmin recirculation, the pump is switched on.
Settings range: 10 °C to 85 °C
4.4.3 Recirculation hysteresis = Deactivates recirculation pump switching hysteresis
If temperature exceeds Tmin at S1, the pump is switched off.
Settings range: 1-20K / Default: see table.
4.4.4 Maximum recirculation ow = Maximum delivery of recirculation pump
If the flow rate measured at sensor 6 exceeds this value, the recirculation pump is switched off.
Settings range: 1-50 l/min.
b This value is set during system calibration.
4.4.5 Recirculation periods = The time bands during which the recirculation pump is enabled
Three separate time bands can be set for each day of the week. Bands can be copied from one day to another. Settings
range: Off/ 00:00-23:59 / Default: see table.
b Recirculation is disabled outside these time bands. The time settings are only used in “Periods” recirculation mode.
4.4.6 Draw-off support
To ensure a constant temperature even when small volumes of water are drawn off, the recirculation pump can also be
used to assist draw-off.
The pump runs under normal conditions and when small volumes are drawn off.
If a storage cylinder sensor is connected, draw-off support is enabled when this sensor detects Tmin.
Settings range: On, Off / Default: see table.
4.4.7 Minimum storage temperature
Draw-off support is disabled if storage temperature drops below “Minimum storage temperature”.
Minimum storage temperature: Settings range: 0 to 80 °C / Default: see table.
4.4.8 Draw-off support measuring
See “F3. - Calibration”.
4.6 Storage stratication
The storage stratification function operates a valve that deviates the return to the centre or bottom of the storage cylinder
on the basis of temperature. This menu sets the temperature differential between the return and the storage cylinder. If
return temperature exceeds storage temperature by the value set here, the central part of the storage cylinder is buffered.
If no storage sensor is connected, storage temperature is set at 25 °C.
4.11 Comfort
When this function is active, the primary circuit pump pumps water through the heat exchanger every 15 minutes to en-
sure that hot water is delivered as rapidly as possible when water is drawn off.
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”.
5.1 Anti-legionella
With the AL function activated, the MFWC controller heats
the pipes and the storage cylinder at selectable periods
(AL period) for a set time (AL residence time), until the
target temperature setpoint (AL Tset) is reached.
AL Tset + 5 °C is taken as the reference for the temperature measured at S4. For the period during which the AL function
is active, Tmax is set at AL Tset + 10 °C to prevent shut-down for high temperature. The AL function terminates only when
a temperature of at least “AL Tset - 5 °C” is reached at the hot water sensor and at the recirculation sensor (if installed) for
the time set in “AL residence time”. The “Last AL heat” is shown on the display. If the AL function fails to terminate after 2
hours, the function is cancelled and an error message is displayed.
AL function – Settings range: On, Off / Default: see table.
AL run time
AL Tset
AL Period
AL residence time
Manual start – starts a heating cycle immediately
b During the Anti-legionella function the storage cylinder is heated to high temperatures that can lead to scalding and
damage to the system.
5.Exit protective functions
5.1.Anti-legionella
5.2.Limescale protection
esc
Info

19
ENGLISH
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 pump can be set to continue pumping water through the heat exchanger
after a draw-off of between 5 and 30 seconds or until the temperature at the VFS drops below Tset. Settings range: On,
Off / Default: see table.
5.3 Setpoint auto-regulation
This function is used if the primary circuit does not always reach the required temperature.
With this function active:
If no storage sensor is connected:
If setpoint temperature is not reached after 60 seconds, setpoint temperature minus 3 °C is assumed as a new setpoint.
When the primary circuit pump stops, setpoint temperature is returned to the original Tset value.
If a storage sensor is connected:
If the temperature measured by the storage sensor is below Tset - 5 °C, the setpoint is lowered to setpoint minus 5 °C.
In both cases, “Tmin recirculation” is lowered to the new setpoint temperature – recirculation hysteresis minus 5°C, at
which “Tmin recirculation” is no lower than 0°C and no higher than the Tmin recirculation setpoint.
Settings range: On, Off / Default: see table.
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 values
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 V1
This menu contains the settings for 0-10V or PWM pump control.
b The power supply for high efficiency pumps using 0-10V / PWM control can be connected to the corresponding
relay (V1 -> R1, R2 ->V2), since the relays are activated and deactivated 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 using 0-10V signal;
PWM: speed control using PWM signal.
6.1.2 Pump
This menu allows the selection of preconfigured profiles for different pumps. In practice, the single settings remain acces-
sible even when a profile has been selected.
6.1.3 Output signal
This menu determines the type of pump in use: solar pumps deliver maximum power with a high control signal, whereas
conversely, heating pumps operate at their maximum power rating when the control signal is at its lowest.
Solar = normal, heating = inverted.
Settings range: normal, inverted / Factory setting: see table.
6.1.4. PWM off
This signal is deactivated when the pump shuts off (Pumps capable of detecting a cable break require a minimum signal)
6.Exit special function
6.1.Pump V1
6.2.Speed pump V1
esc
Info

20
Settings range: (Solar:) 0 ...50 % / Default: See table
(Heating:) 50 % ... 100 % / Default: See table
6.1.5. PWM on
This signal is needed to switch on the pump at minimum speed.
Settings range: (Solar:) 0 ...50 % / Default: See table
(Heating:) 50 % ... 100 % / Default: See table
6.1.6. PWM Max
This determines the output signal for operation of the pump at maximum speed, used for example when purging the
system or in manual mode.
Settings range: (Solar:) 50 ...100 % / Default: See table
(Heating:) 0 % ... 50 % / Default: See table
6.1.7. Show signal
The signal setting is displayed in graph and text format.
6.2 Speed control, pump V1
This menu makes it possible to limit the speed of connected 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.
Settings range: 70 ... 100 % / Default: see table.
b The percentages indicated are guideline only, and could be higher or lower depending on the particular system,
pump and pump phase.
6.2.2 Min speed
This is where the minimum speed of the pump connected to relay R1 is set. During the setting procedure, the pump runs
at the selected speed so that the flow rate can be determined.
Settings range: 10 % to max. speed minus 5 % / Default: see table.
b The percentages indicated are guideline only, and could be higher or lower depending on the particular system,
pump and pump phase. 100 % is the maximum possible voltage/frequency of the controller.
6.5 Relay functions for voltage-free contacts 1-3
The special functions described here can be assigned to non-connected relays. Each additional function can only be
assigned once.
All the special functions for which variable values can be set are listed in menu “4. Settings” as soon as they are activated
or assigned.
The default setting for Relay 1 is “Always on”.
The default setting for Relay 2 is “Recirculation”.
Bear in mind that recirculation settings only appear in the settings menu if the recirculation function is activated for a relay.
Before you can change the assignment of a relay, you must first deactivate the previous assignment. Pay attention to relay
technical specifications.
6.5.1 Recirculation
This selects recirculation as the relay function. This is the default function for Relay 2.
6.5.2 Storage heating
This function heats the storage cylinder when necessary.
6.5.2.1 Storage heating
Settings range: On-Off.
6.5.2.2 Minimum storage temperature
Storage cylinder heating is switched on if temperature as measured at the storage sensor drops below this value outside
the periods set for storage heating.
6.5.2.3. Temperature setpoint
Storage heating is switched on if temperature as measured at the storage sensor drops below this value during the pe-
riods set for storage heating.
6.5.2.4. Storage hysteresis = Activation of storage switching hysteresis
The required storage temperature is reached after draw-off, either from minimum storage temperature or from the target
temperature plus the hysteresis value set here. Storage heating is switched off when the target storage temperature is
reached, as detected by the storage sensor.
6.5.2.5 Heating periods = Storage heating activation times
The periods during which the storage thermostat is active are set here. Three separate time bands can be set for each
day of the week. Bands can be copied from one day to another.
6.5.3. Storage stratication
The storage stratification function operates a valve that deviates the return to the centre or bottom of the storage cylinder
on the basis of temperature. This menu sets the temperature differential between the return and the storage cylinder. If
return temperature exceeds storage temperature by the value set here, the central part of the storage cylinder is buffered.