Riello SC ACS 160 User manual

1
ENGLISH
SC ACS 160-225
The SC ACS 160-225 is a floor-standing module for the instantaneous production of domestic hot water for large appli-
cations.
The function of the module is to heat domestic hot water by exchanging energy from a buffer tank.
The advantage of using the module is to produce domestic hot water in large volumes, with a primary temperature of
48°C (with DHW 45°C).
This allows the use of several energy sources, such as solar energy, heat pumps, biomass, etc.
The module has been designed integrating the most advanced hydraulic and electronic control technologies ensuring
the production of DHW up to 220 l/min per module.
Description Q.ty
1 DHW mixer in packing 1
2 Instruction manual 1
3 Circulation pump assembling instructions 1
4 DHW return pump assembling instructions 1
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-0100463 - 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 in accordance with
industry standards and with these instructions, adopting best professional practices, by suitably qualified persons work-
ing for a company that will assume 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 controller must be installed and connected by authorized staff according to applicable regulations.
Connect the power supply to the control unit complete with bipolar switch fuses (power 230Vac 50Hz). It is essential to
connect the proper grounding.
b The product must be connected to the mains power supply via an earth leakage breaker in accordance with ap-
plicable standards. Correct functioning is only guaranteed provided the product is used with a pump for which it is
designed. The manufacturer cannot be held responsible for the consequences of improper uses.
WATER CONNECTIONS
After delivery of the product, ensure the tightening of all nuts fixing the pipes.
Be especially careful when you are connecting the piping kit to the hydraulic module, and avoid to bend the copper pipes.
b Installation, connections and testing must be done by qualified staff who works in accordance with the standards
and follows the instruction manual. All piping should be insulated in accordance with the law.
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.
- Before carrying out components, empty the water from the system and close the shut-off valves.

3
ENGLISH
11
16
13
1
7
2
10
4
6
3
14
12
15
9
5
8
STRUTTURA
1 Cabinet in painted steel sheet, ventilation slots for internal electronic components, and inspection access
on all four sides
2 AISI 316 stainless steel brazed plate heat exchanger
Primary circuit
3 Filter
4 Non-return valve
5 Primary circuit mixer valve with servomotor (220 V AC, 3 positions)
6 High efficiency modulating pumps (1) and (2) installed in parallel
7 Automatic vent valve
8 Double return diverter valve
9 Primary circuit shut-off ball valve
10 Filling/drain cock, 1/2” M
Secondary circuit
11 Digital flow and temperature meter, 5-100 l/min – 10-200 l/min
12 Filter
13 Anti-pressure surge ball valve
14 Circulation pump
15 Non-return valve
Electric control panel
16 Main switch; controller.
MAIN COMPONENTS

4
WATER CIRCUIT
2
23
4
4
5
6
710
10
10
11
9
11
1
1
1
8
1
EAF
S4
S5
VFS1
S3
S1
S2
S6
5
5
5
1 Shut-off valve
2 Y filter
3 Three-way mixer valve
4 Modulating pump
5 Non-return valve
6 Heat exchanger
7 Flow meter with temperature sensor (S5-S6)
8 Three-way diverter valve
9 Vent valve
10 Drain valve
11 Non-return valve (recommended, not supplied)
Single return variant
Double return variant

5
ENGLISH
TECHNICAL SPECIFICATIONS
DESCRIPTION SC ACS 160 SC ACS 225
DHW Flow (min-max)
10÷200 10÷200 l/min
DHW production
T prim. 55°C - ∆T sec. 10÷45°C 100 150 l/min
T prim. 60°C - ∆T sec. 10÷45°C 135 187 l/min
T prim. 65°C - ∆T sec. 10÷45°C 165 220 l/min
Maximum flow-rate primary 8000 10500 l/h
Maximum power exchanged 403 537 kW
Maximum secondary flow rate 225 225 l/min
Maximum operating temperature 90 90 °C
Maximum operating pressure, primary circuit 10 10 bar
Maximum operating pressure, secondary circuit 10 10 bar
Consumption 410 770 W
Power supply voltage 230 230 V
Index of protection 40 40 IP
Primary circuit pumps
Wilo STRATOS PARA
25/1-8 Wilo STRATOS PARA 25/1-12
Overall dimensions (b x h x p) 900 x 1000 x 500 mm
Overall dimensions (b x h x p) 1050 x 1225 x 580 mm
SECONDARY CIRCUIT PRESSURE LOSS P1-P2
P1 P2
SC ACS 160
SC ACS 225
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
01,0
[bar]
[l/h]
0
0 1500 3000 4500 6000 7500 9000
10
20
30
40
50
60
70
80
90
100
[kPa]
1100
mm
Height with external tubes SC ACS 160 - SC ACS 225

6
PERFORMANCE CHARTS
SC ACS 160
Produzione ACS (l/min)
Temperatura prelievo accumulo (°C)
4540 50 55 60 65 70 75 80
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
0,00
0,17
0,33
0,50
0,67
0,83
1,00
1,17
1,33
1,50
1,67
1,83
2,00
2,17
2,33
2,50
2,67
2,83
3,00
3,17
3,33
3,50
3,67
3,83
4,00
4,17
4,33
[l/sec]
10÷42 °C
10÷45 °C
10÷48 °C
10÷50 °C
10÷55 °C
10÷60 °C
DHW ow rate (l/min)
Temperature of water from storage cylinder (°C)
DHW RETURN PRESSURE LOSS P3-P2
0
1
2
3
4
5
6
7
8
9
10
[mH2
O]
[l/h]
0
0 1000 2000 3000 4000 5000
P3 P2
10
20
30
40
50
60
70
80
90
100
[kPa]
Wilo stratos para z 25/1-8
SC ACS 160
SC ACS 225

7
ENGLISH
SC ACS 225
Produzione ACS (l/min)
Temperatura prelievo accumulo (°C)
4540 50 55 60 65 70 75 80
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
10÷42 °C
10÷45 °C
10÷48 °C
10÷50 °C
10÷55 °C
10÷60 °C
0,00
0,17
0,33
0,50
0,67
0,83
1,00
1,17
1,33
1,50
1,67
1,83
2,00
2,17
2,33
2,50
2,67
2,83
3,00
3,17
3,33
3,50
3,67
3,83
4,00
4,17
4,33
[l/sec]
NB: The proper working of the module is assured if the supply temperature of the primary circuit is at least 3°C greater
than the DHW temperature set.
DHW ow rate (l/min)
Temperature of water from storage cylinder (°C)
PRIMARY CIRCUIT PUMP CHARACTERISTICS
0
012345678910 11 12
2
4
6
8
10
12
14
Flow [m³/h]
Head [m]
Stratos PARA (15)(20) 25/1-5
Stratos PARA (15)(20) 25/1-7
Stratos PARA (25)(30)/1-8
Stratos PARA (25)(30) 1-11 Stratos PARA (25)(30) 1-12
Stratos PARA (20)(25) 1-11,5

8
DIMENSIONS AND FITTINGS
MP
RP1
RS
RP2
EAFS
UACS
125
1000
100174226
62.5 125 125
500
RP1 RP2 EAFS
MP
UACS
RS
125 125 115
SC ACS 160-225
RP1 Primary outlet
1 (bottom of storage
cylinder) 1 1/2”
RP2 Primary outlet
2 (middle of storage
cylinder) 1 1/2”
MP Primary inlet 1 1/2”
RS DHW circulation inlet 1 1/4”
EAFS Domestic cold
water inlet 1 1/4”
UACS Domestic hot
water outlet 1 1/4”
Dimensions:
Height 1140 mm
Width 1000 mm
Depth 500 mm
Install the unit with at least 50 cm free access all
around it to permit inspection and mainte

9
ENGLISH
WIRING DIAGRAM

10
SYSTEM SCHEMATIC
EAF
Fonte di calore
Uscita ACS
Ricircolo
Mandata
primario
EAF
Fonte di calore
Uscita ACS
Ricircolo
Mandata
primario
OFF
ON
Boiler
Boiler
DHW outlet
DHW outlet
Recirculation
Recirculation
Cold
water
inlet
Cold
water
inlet
Primary
inlet
Primary
inlet
Single return variant
Double return variant

11
ENGLISH
CONTROL PANEL
- The controller incorporates an illuminated display with a synoptic that identifies the unit’s active functions and instant
temperatures.
- In the event of a malfunction in either of the DHW pumps, the unit automatically adjusts itself to deliver up to 60% of the
hot water requested.
- The unit is designed to make replacement of the controller as easy as possible. The controller is located inside the IP55
electrical control panel.
C1
C2
CR
G
Legend
G Main switch
C1 Pump 1
C2 Pump 2
CR Circulation pump

12
PRELIMINARY CHECKS
First of all, carefully remove the outer packing, then:
- Remove the cardboard box, by pulling it upwards.
- Remove the protective nylon sheet.
- Disassemble and remove the protective wooden cage
using a lever to remove the staples.
- Separate the mixer from the pallet by loosening the feet
(1) and sliding off the bracket (2) securing the mixer to
the pallet.
Check that the unit is complete and undamaged. If any
defect or damage is detected, do not install or attempt to
repair the product but return it to the retailer.
Dispose of packaging in compliance with applicable law.
b The product is supplied by the manufacturer com-
pletely screwed. The transport or a long stock may
not grant the seal. Please check the seal before the filling of the system.
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.
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 accordance
with industry standards by suitably qualified persons working for a company that will assume full responsibility for
the completed installation.
INSTALLATION AND PUTTING INTO SERVICE
2
1
INSTALLATION
HANDLING
The customer is responsible for providing suitable equip-
ment for unloading and moving the unit, for checking the
number of pieces delivered and for verifying the integrity
of all material.
The unit is delivered on a pallet. Use a pallet jack or forklift
truck to move the unit. Make sure that the load is perfectly
secure in order to avoid the risk of tipping presented by
the unit’s weight distribution and high centre of gravity.
Take care to avoid impacts. Move the unit to its place of
installation before removing the packing.
b It is strictly necessary to keep a distance of 175
mm from the short sides of the pallet (as shown in
the figure) in order to avoid possible damage to the
product.
175 175700
1050

13
ENGLISH
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, it already includes a self-sufficient regulation.
- 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.
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. Ambient 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 practically possible to the storage cylinder, in order to avoid unnec-
essary heat loss from the connecting pipes. The product must be placed on a surface that is flat and stable, as far
as possible, and levelled up by means of the adjustable feet provided.
b Adjust the feet to level the unit and eliminate all stresses.
b Connect the system pipes respecting the connections.
b Tighten the fittings only after having installed all the pipes.
b Avoid the coupling of materials that can create potential differences with consequent electrochemical corrosion.
b It is absolutely avoid to intervent on the connections already present in the device!
WATER CONNECTIONS
POSITIONING
b The distance of the module from the storage cylin-
der must be at maximum 7/8 m.
7000 / 8000
b The distance of the module from wall must be at
minimum 0,5 m.
500

14
The connection to the sanitary water network must follow the prescriptions of the current legislation.
b The domestic cold water supply must be fitted with a safety valve conforming to DIN 4753 part 1. The operating
pressure of this valve must be equal to the unit’s maximum operating pressure.
b If the pressure of the water supply reaches 10 bar, install a pressure reducer downstream from the water meter.
b We recommend the installation of a suitably sized potable water expansion vessel.
b The domestic cold water supply must be fitted with a suitable water filter. Provide an expansion tank, suitably sized,
in order to avoid over-pressure due to water hammer and thermal expansion.
WATER PARAMETER UNIT OF
MEASURE
MIN/MAX
PERMISSIBLE
VALUE FOR
COPPER-BRAZED
HEAT EXCHANGERS
PH 7-9 (indicative of
saturation)
Saturation index
(delta PH) -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
In presence of water with hardness above 15° Fr, is pre-
scribed an appropriate treatment of the heating water, in
order to avoid limescale problems. It should be noted that
even a small quantity of limescale, could reduce the per-
formances of the domestic side.
The materials of construction are in compliance with the
Directive 98/83 EC.
Despite the fittings are mounted at the factory, it is advis-
able to monitor all screw connections. Equally important
is to do a pressure test during the operation.
Exceeding above listed limits may cause damages to
module and impair warranty terms consequently
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.

15
ENGLISH
On completion of all transport or handling operations, always check the tightness of the water fitting ring nuts.
Take particular care when connecting the unit to the water supply. When tightening a fitting, always hold the opposite
fitting steady with a second tool to avoid damage.
Connect up the pipes according to the legend on the unit itself and according to the instructions given in this manual. it
is recommended to minimize the length of the connection pipes to the buffer storage.
The following materials are recommended for the construction of the piping system: steel or copper for the primary circuit;
galvanised steel, copper or hot water compatible plastic for the secondary circuit. Galvanised pipes and fittings must only
be used in the secondary (DHW) circuit, and care must be taken to avoid electrochemical corrosion.
a Do not install the unit in gravity feed hot water systems!
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 Make sure that no obstacles are present between the safety valve and the unit.
b The diameter of the drain pipe must not be smaller than that of the safety valve’s drain fitting. The drain pipe should
be no longer than 2 metres and should have no more than two bends in it. If this length has to be exceeded, in-
crease the diameter of the pipe. Never exceed 4 metres and 3 bends.
b Do not install filters or other restrictions.
b Make sure that the pipes are watertight before securing them in place.
b Check that all threaded fittings on the unit are tightened to the correct tightening torque (in case they have worked
loose during transport).
b Make sure that the unit is disconnected from the mains power supply before opening the casing of the control panel!
SAFETY WARNINGS
b The unit can become hot enough to cause burns if touched.
b In the event of a power failure, the motorised control valve could remain in the open position, causing the whole
system to become hot enough to cause burns if touched.
b Water in the unit can be very hot and under pressure. Therefore, before performing any work, always drain the unit
and close the shut-off valves on the primary and secondary circuits.
b The unit must be installed and put into service in strict conformity to all laws and standards applicable in the place
of installation, and according to best professional practices.
EXAMPLE OF INSTALLATION

16
SYSTEM VARIANT WITH SINGLE RETURN TO STORAGE CYLINDER
b The following procedure must be completed before putting the sys-
tem into service.
Proceed as follows to disable the return to the middle of the storage cyl-
inder.
- Close cock RP2 (primary return to middle of storage cylinder);
b We recommend that you screw a 1 ½” M plug into the RP2 fitting.
- Identify the diverter valve with servomotor at the rear of the mixer;
- Loosen the two lock screws with a screwdriver;
- Remove the servomotor by pulling it upwards and place it to the side
of the valve.
ELECTRICAL CONNECTIONS
The product must be installed and all electrical connections made by suitably qualified personnel in conformity to appli-
cable standards. The controller’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 unit must be connected to the mains power supply via an earth leakage breaker in accordance with applicable
standards. The manufacturer cannot be held responsible for the consequences of improper uses.
b Electrical connections must only be made by qualified personnel.
a 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.
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.
PRIMARY CIRCUIT FILLING PROCEDURE
b Fill and bleed the primary circuit with the water at ambient temperature.
- Set the controller for operation in manual mode (see parameter 4.2).
- Set to ON: R3, V2, V3 and V4 which espectively allow you to open the mixing valve and put it into operation primary
side circulators.
- Open the vent valve.
- Pump water around the circuit for 2 minutes.
- Switch on relay R1 to open the storage tank middle valve (double return variant)
- Pump water around the circuit for 2 minutes.
- Close the vent valve.
- Set the controller for operation in automatic mode (see parameter 4.1).
RP2
A
B
All BIG T-FAST ie versions are supplied with S4 temper-
ature probe (puffer high) already wired to the electrical
panel, to be connected to the puffer.
S5 PROBE POSITIONING (ONLY WITH DIVERTER KIT)
If BIG T-FAST ie is equipped with a diverter valve primary
return kit, it is necessary to connect S5 probe (low puffer)
supplied and already wired to the electrical panel, in the
lower part of the puffer.
S4
S5

17
ENGLISH
C ircuit filling and putting into service must only be done by
qualified personnel.
Fill and bleed the primary and secondary circuits and check
for leaks before putting the unit into service.
- Check that the ring nuts of all the water fittings are tight.
- Open the cold water and hot water shut-off valves slowly in
order to avoid pressure surges.
- Fill the system and check it for water tightness.
- 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.
- Power on the unit.
- Bleed the system as follows:
- Open a hot water tap near the unit.
- Bleed the primary (storage cylinder) circuit by means of the vent valve normally located at the highest point in the circuit.
- Continue until all the air has been bled from the system.
b Persistent water circulation noises from the pump indicate that there is still air in the circuit.
- Close the unit’s inspection doors.
b
Before starting the product, it is necessary to connect the pre-wired temperature probe S4 to the puffer (see the
CONNECTIONS section).
b Connect electrically the module to the 230 VAC mains: Use the terminals indicated in the figure.
- It is advisable to pass the power cable through the ap-
propriate holes in the cabinet, and through the cable
glands of the electrical panel.
- Proceed with the venting of the primary and recircula-
tion circuits (if presents) as follows:
- power up the module by activating the selector;
-
- from the control unit (for more details on the operation of
the control unit read the next section carefully);
- access menu 3, OPERATING MODE and press OK,
then activate MANUAL FUNCTION in menu 3.2;
- use the <or> selector to move to function V3 (1st pri-
mary circulator) and activate by pressing the OK key.
Leave the circulator active for at least 20 seconds to
eliminate the residual air inside the circuit;
- use the <or> selector to move to function V4 (2nd pri-
mary circulator) and repeat the operation as described
above;
- repeat the last 2 points at least 2 times for the complete
elimination of the air;
- n the presence of a recirculation kit, from the same
menu activate V1 (recirculation circulator). Repeat the
procedure as above.
The recirculation kit, not as the primary circuit, re-
quires a manual venting operation, by acting on the
special valve located above the circulator.
The same is connected to a drainage tube. It is advis-
able to carry out the bleeding operations by slightly
opening the valve and using a suitable container to
avoid splashing water against the electrical parts of
the BIG T-FAST.
b
The module is unable to fully vent the recirculation
circuit, authorized personnel must vent manually all
the recirculation branches in the building.
- Exit the manual mode and reactivate the AUTOMATIC FUNCTION.
- The vent on the side of the buffer storage takes place by means of a suitable device located on the rear of the same.
- Set an appropriate adjustment in the control unit (see the next par.).
b
The connections of the electrical devices inside the module are already made by the manufacturer. The connection to the
electrical network must be made using a special cable (not supplied by the manufacturer), following the instructions pro-
vided.
b Any intervention on the electrical parts of the device must be carried out in compliance with the regulations in force.
PUTTING INTO SERVICE
OFF ON
b
Provide electrical protections on the power supply line as per current legislation.

18
USE AND FUNCTIONS OF THE CONTROLLER
EU-Conformity
By affixing the CE mark to the unit the manufacturer declares that the LFWC conforms to the following relevant safety
regulations:
- EU low voltage directive 2014/35/EU
- EU electromagnetic compatibility directive 2014/30/EU conforms.
Conformity has been verified and the corresponding documentation and the EU declaration of conformity are kept on file
by the manufacturer.
General instructions. Please read carefully!
These installation and operating instructions contain basic instructions and important information regarding safety, in-
stallation, commissioning, maintenance and the optimal use of the unit. Therefore these instructions must be read and
understood completely by the installation technician/specialist and by the system user before installation, commissioning
and operation of the unit.
This unit is an automatic, electrical Fresh Water Controller. Install the unit only in dry areas and under the ambient con-
ditions described in “Specifications”.
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.
Changes to the Unit
- Changes, additions to or conversion of the unit are not permitted without written permission 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,
turn the Unit 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 described in these instructions may be set using the Unit.
b Changes to the unit can compromise the safety and function of the unit or the entire system.
ABOUT THE CONTROLLER
The Fresh Water Controller LFWC facilitates efficient use and function control of your Fresh water system possible while its
handling is intuitive. After every input step the suitable functions are matched to the keys and explained in a text above. In
the menu 'measurement values and settings' are help text and graphics in addition to key words.
The LFWC can be used for the various system variants.
Important characteristics of the LFWC are:
- Depiction of graphics and texts using a lit display.
- Simple viewing of the current measurement values.
- Statistics and system monitoring by means of statistical graphics
- Extensive setting menus with explanations.
- Menu block can be activated to prevent unintentional setting changes.
- Resetting to previously selected values or factory settings.
MAIN CHARACTERISTICS:
- PWM output for pump speed control
- 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
CONTROLLER TECHNICAL SPECIFICATIONS
Electrical specications:
Power supply 100 ... 240VAC, 50 ... 60 Hz
Power consumption / standby 0,5 W - 2,5 W/ 0,5 W
Internal fuse 2A slow blow 250V
Protection Class IP40 / II
Sensor inputs 5 + 3 nel box Pt1000 temperature sensor -40 °C ... 300 °C
Sensor inputs flow 1 Grundfos Direct Sensor 0 °C-100 °C (-25 °C /120 °C short
term) VFS type; in l/min 1 - 12, 2 - 40,

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ENGLISH
5 - 100, 10 - 200
Mechanical relay R1 - R4 460VA for AC1 / 460W for AC3
0-10V/PWM output V1,V2 (0-10V/PWM) | V3,V4 (PWM), for 10 k Ω working resistance 1 kHz, level 10 V
Max. cable length:
Pt1000 sensor < 10m
Flow sensors < 3m
CAN <3m; at> = 3m, a shielded twisted pair cable must be used. Isolate
shielding and connect it to the protective conductor of only one of the devices.
0-10V/PWM < 3m
Mechanical relay < 10m
Interface:
Fieldbus CAN
Permissible Ambient Conditions:
for controller operation 0 °C - 40 °C, max. 85 % rel. humidity at 25 °C
for transport/storage 0 °C - 60 °C, no moisture condensation permitted
INSTALLING THE TEMPERATURE SENSORS
The controller operates with Pt1000 temperature sensors which are accurate to 1 °C, ensuring optimal control of system
functions.
b
If desired, the sensor cables can be extended to a maximum of 30 m using a cable with a cross-section of at least
0.75 mm². Ensure there is no contact resistance! Position the sensor precisely in the area to be measured! Only use
immersion, pipe-mounted or flat-mounted sensors suitable for the specific area of application with the appropriate
permissible temperature range.
b
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.
POSITIONNING OF S4 PROBE
They are supplied with S4 temperature probe (high puffer) already wired to the electrical panel, to be connected to the
puffer, as shown in fig. 6.
S5 PROBE POSITIONING (ONLY WITH DIVERTER KIT)
If BIG T-FAST ie is equipped with a diverter valve primary return kit, the S5 probe (low puffer) must be connected in sup-
plied and already wired to the electrical panel, in the lower part of the puffer, as shown in fig. 6.
Temperature resistance table for Pt1000 sensors
°C -20 -10 0 10 20 30 40 50 60 70 80 90 100
Ω922 961 1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
b The controller must only be installed, put into service, repaired and changed by trained and qualified technical
personnel.
b Before the unit can be put into service, the controller must be fitted and default settings programmed by specialist
personnel as required by local and national legislation and standards and in accordance with the safety precautions
and instructions given in this manual.
b Specialist personnel working on the controller must read this manual before proceeding.
b The controller requires no special maintenance.
b Read and understand all the precautions and instructions contained in this manual before operating the controller.
Take care to follow all the safety precautions. If in doubt, consult a specialist.
b The product is not designed to be operated by children or persons with limited physical, psychological, sensorial or
mental capacities. If such persons are allowed to operate the product, they must be instructed and supervised by
a person responsible for their safety.
b Make sure that children never play with the unit.

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CAN CAN VVX BOX
1 CAN high 1 CAN high 4 + Power supply 5 S6 Storage transfer
2 CAN low 2 CAN low 3 GND 4 S7 Solar
2 l/min 3 S8 not used (optionally)
1 Temp. °C 2 V4 additional pump PWM signal
1 GND
ON THE CONTROLLER
BOX VFS CAN CAN