Alfa Network Optigo SFMC User manual

ORIGINAL INSTRUCTIONS
31481875EN-00
Optigo SFMC
Instruction manual
• Product description
• Product labels
• Unpacking & lifting
• Installation
• Maintenance
• Spare parts

31481875EN-00
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Index
1. Important information ............................................................................................................ 4
1.1 Disclaimer ................................................................................................................................. 4
1.2 Intended use ............................................................................................................................. 4
1.3 Where to nd product information ............................................................................................ 4
1.4 Warning symbols ...................................................................................................................... 4
1.5 Health, safety and hygiene ....................................................................................................... 5
1.6 Use of ammable gas ............................................................................................................... 5
1.7 Checks at delivery .................................................................................................................... 6
1.8 Return of unused heat exchangers .......................................................................................... 6
1.9 Guarantee ................................................................................................................................ 6
1.10 Disposal .................................................................................................................................... 6
2. Product description ............................................................................................................... 7
2.1 General information and application ......................................................................................... 7
2.2 Standard conguration ............................................................................................................. 7
2.3 Options ..................................................................................................................................... 8
2.4 Code description ...................................................................................................................... 8
3. Product labels ......................................................................................................................... 9
4. Transport and storage ......................................................................................................... 11
5. Unpacking and lifting ........................................................................................................... 12
5.1 Units packed with cardboard box ........................................................................................... 12
5.2 Units packed with crate .......................................................................................................... 13
5.3 Lifting ...................................................................................................................................... 13
6. Installation ............................................................................................................................ 14
6.1 Mounting dimensions ............................................................................................................. 14
6.2 Mounting bracket .................................................................................................................... 15
6.3 Technical spaces .................................................................................................................... 15
6.4 Refrigerant connections ......................................................................................................... 16
6.5 Cooler capacity check ............................................................................................................ 17
6.6 Drain line ................................................................................................................................ 17
6.7 Electrical connections ............................................................................................................. 18
6.8 Power failure .......................................................................................................................... 18
6.9 Fan motors connections ......................................................................................................... 19
6.10 Defrost .................................................................................................................................... 21
6.11 Defrost connections (SF27MC models - optional) .................................................................. 22
6.12 Defrost connections (SF31MC models - optional) .................................................................. 24
6.13 Defrost connections (SF35MC models - optional) .................................................................. 26
6.14 Insulated suction hood mounting ............................................................................................ 28
7. Maintenance .......................................................................................................................... 32
7.1 Shut down periods .................................................................................................................. 32
7.2 Moisture in the refrigeration system ....................................................................................... 32
7.3 Cleaning and disinfecting ....................................................................................................... 32
7.4 Casing .................................................................................................................................... 32
7.5 Coil and drip tray .................................................................................................................... 32
7.6 Electric defrost elements replacement ................................................................................... 33
7.7 Driptray heater elements replacement ................................................................................... 34
7.8 Fans ....................................................................................................................................... 34
7.9 Fan replacement (SF27MC models) ...................................................................................... 35
7.10 Fan replacement (SF31MC and SF35M models) ................................................................... 35
7.11 Fan shroud heater (optional) .................................................................................................. 36

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
8. Residual risks ....................................................................................................................... 37
9. Troubleshooting ................................................................................................................... 37
10. Spare parts ............................................................................................................................ 38
10.1 Spare parts (SF27MC models) ............................................................................................... 38
10.2 Spare parts (SF31MC and SF35MC models) ........................................................................ 39

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
1 Important information
1.1 Disclaimer
This Instruction Manual applies to all Optigo SFMC air cooler products. Manual must be carefully
examined and instructions should be followed up at all times.
Alfa LU-VE does not accept liability for any damage resulting from non-compliance to the instruc-
tions as given in the manuals and order-related documents.
1.2 Intended use
Air coolers are partly completed machinery according to Machine Directive 2006/42/EC and are
intended for incorporation in cooling systems. Declarations of Incorporation are available on
alfa.luvegroup.com. The product is built according to the following standards:
• PED 2014/68/EU
• Safety of Machinery EN 60204-1
• Directive 2014/30/EC and subsequent modifications. Electromagnetic compatibility.
• Low Voltage - Reference Directive 2014/35/EC
However it is forbidden to operate our equipment before the machine incorporating the products or
making part thereof has been declared to be in conformity with the EC Machine Directive.
1.3 Where to find product information
Detailed technical data for individual product models are available in order related documents,
on the product label and in product data sheets. Comprehensive technical information for all
Alfa LU-VE air heat exchanger products is available on-line on alfa.luvegroup.com. This includes:
• Product manuals
• Instruction manuals
• Product leaflets & brochures
• Product data sheets (selection software)
• Dimensional drawings
• Certificates
Alfa LU-VE offers world-wide service and support. In case of any questions
or uncertainty please contact your local Alfa LU-VE representative.
Contact addresses are available at alfa.luvegroup.com.
1.4 Warning symbols
The following warning symbols are used in Alfa LU-VE instruction manuals.
General warning.
Risk of malfunctioning and/or
damage.
Hot surfaces. Danger of burns.
Wear adequate protection.
Moving parts. Danger of injuries.
Do not operate without protection guard mounted.
Sharp surface. Danger of cutting injuries. Wear
adequate protection.
Overhead load.
Never stand or walk below the load.
Mandatory prescription.
Follow instructions as provided.
Forklift trucks or other logistic vehicles.
Stay clear of working space.
Risk of injuries.
Wear head protection.
alfa.luvegroup.com/sfmc

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Electrically powered component. Switch off power
supply before any maintenance or installation
activity.
Risk of injuries.
Wear safety footwear.
Cold parts. Danger of frostbite injuries.
Wear adequate protection.
Risk of injuries.
Wear protective gloves.
A2L flammable gas.
1.5 Health, safety and hygiene
Ensure that the following guidelines are observed:
• All work on the equipment must be carried out by trained personnel.
• The electrical supply is suitable for the equipment supplied.
• Refrigerant, temperature and pressure must agree with the data on the product label of the
relevant heat exchanger.
• As the heat exchanger is supplied indirectly, the producer is not acquainted with its actual appli-
cation.
• The heat exchanger should be installed in conformance with the recognized national standards
of electrical and refrigeration installation practice.
• The supplied heat exchanger is optimized for the refrigerants as stated in the data sheet or
order documents. The allowed maximum pressure is noted on the type plate. During production
the heat exchanger was subjected to a strength test exceeding the design pressure. However,
during normal use the design pressure may not be exceeded.
• Heat exchangers supplied by Alfa LU-VE are normally not equipped with a high-pressure cut
out. The installer is responsible for fitting a high-pressure cut out on the system in which the
heat exchanger is used.
• The heat exchanger shall not be blocked in. If the ambient temperature rises, the pressure could
rise and exceed the design pressure.
• It is not permitted to use the heat exchanger for any purpose other than the one it was designed
for by Alfa LU-VE.
• If the equipment is used in the food industry, responsibility with regard to hygienic conditions lies
with the end user.
1.6 Use of flammable gas
• The product must be stored and installed in rooms where the use of open flames or other
ignition sources is forbidden
• During transport, handling, installation, the product and, in particular, the pipes must be
protected to avoid physical damage which may cause it breakage.
• In the event of suspicious damages or doubts about the correct handling (eg. damaged
packaging) do not install the product before carrying out a thorough integrity check.
• Install the product only and exclusively in places that comply with the minimum size and/or air
exchange requirements established by the applicable standards, in relation to the total charge of
flammable fluid provided for in the installation in which it is incorporated.
• All ordinary and extraordinary maintenance operations must be performed only by qualified
personnel in the use of equipment with flammable fluid. special attention to operations that
require interventions on the pipes.
• The use of refrigerants different than those indicated in the data plate or in this manual is
forbidden.
In general, the use of refrigerants that are not included in the list of the IEC 60335-2-40 Annex b
standard is forbidden.
• Before performing any maintenance operation, exclusively by qualified staff, perform a check for
the absence of gas in the room and around the product through an appropriate detector.
• Before performing any operation for opening the pipes of the refrigerant circuit, by means of
mechanical operations or with open flames, make sure that the circuit does not have any

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
quantity, even minimal, of inflammable gas and that it has been washed internally with inert
gas (ex. nitrogen). all operations must be performed by personnel qualified in the use of
flammable gases.
• The product shall not be modified in any part of it, by removing or adding component.s
• The product is not an Atex product. The connection of any system component that is not already
assembled in the factory, must take place outside the product, at an appropriate distance and
check that its installation complies with all the regulatory requirements applicable to flammable
gas systems.
• The product is not an Atex product. It is the responsibility of the installer to verify the compliance
of the product and its incorporation in the system to european and national standards.
• In the case of components that must necessarily be installed inside the product, the compliance
of the final assembly is the responsibility of the installer. in particular:
- the use of any component, electrical or mechanical, which may be the origin of sparks or
flames, is forbidden. Only the exclusive use of components suitable for use in explosive
atmosphere (Atex) is allowed.
- the use of components that may be cause of flammable gas leaks is forbidden.
The installation of components of the refrigerant circuit is allowed only with permanent brazed
connection.
1.7 Checks at delivery
At the moment of delivery, carefully check the units.
All finned coils are pressure tested with dry air, sealed and supplied with a slight overpressure. Prior
to installation, the leak resistance must be checked with the Schrader valve.
Any present damage must be reported on the delivery note with a description of the damage.
Damaged heat exchangers, including when the damage is not externally visible, are to be reported
to the shipping agent and Alfa LU-VE within 24 hours.
1.8 Return of unused heat exchangers
Air heat exchangers that have been delivered in accordance with orders are in principle not return-
able. Heat exchangers can only be returned under certain conditions and following consultation with
Alfa LU-VE. This applies exclusively to unused units. The heat exchangers that are to be returned
should be delivered carriage paid to Alfa LU-VE in the original, undamaged and unwritten factory
packaging. Not returnable are:
• Heat exchangers older than three months from the invoice date.
• Heat exchangers that have already been built in and/or are damaged.
1.9 Guarantee
For our guarantee conditions, we refer to the Terms of Delivery. In general, the warranty period
between Alfa LU-VE and the customer is 24 months from factory invoice date or 12 months of
operation, which ever comes first. Heat exchangers must not be returned or disposed of, other
than in accordance with instructions from Alfa LU-VE. Contact your local Alfa LU-VE representative
before any remedial action is taken on the units, otherwise warranty may be void.
1.10 Disposal
After decommissioning the heat exchanger coil should be emptied from refrigerant fluids. Avoid
any emissions in the environment. Any refrigerants and oil residuals must be properly disposed of
according to applicable environmental regulations. The fully emptied heat exchanger unit, including
all electrical components, should be handed in to the proper authorized companies for recycling.

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
2 Product description
2.1 General information and application
Optigo SFMC are cubic commercial air coolers suitable for the safe use of ASHRAE A2L
refrigerants. A2L refrigerants have a minimal impact on global warming and they will bring
maximum energy efficiency. So today, they are the best technological solution for air conditioning
and refrigeration applications, outside the natural refrigerants. General application for Optigo SFMC
are in small to medium-sized cooling rooms.
• Available in 3 fan diameters
SF27MC: Ø 275 mm
SF31MC: Ø 315 mm
SF35MC: Ø 350 mm
• Refrigerants:
- Air defrost: certified for the use of any A2L refrigerants
- Electric defrost: certified for the use of the only A2L refrigerants listed on the IEC standard
60335-2-40 (R-32, R-1234YF, R-1234ZE (E), R-444A, R-444B, R-447B, R-451A,
R-451B, R-452B, R-454A, R-454B, R-454C, R-455A)
• Design pressure: 24 bar
• Capacity (SC2 with R404A): 1.05 up to 20.20 kW
• Air flow: 900 up to 10,400 m³/h
• Min. room temperature: - 25 °C
2.2 Standard configuration
• High-efficiency coil manufactured from internally grooved Cu tubes and louvered aluminium fins.
• Standard fin spacings: 4.5, 6, 7 mm; 9 mm only for SF31MC and SF35MC.
• Optigo SFMC coolers are available with 1 to 4 fans fitted with high efficiency EC fan motors
drawing through the coil: single speed for SF27MC, dual speed for SF31MC and SF35MC.
Motors with external rotor for Optigo SF31MC and SF35MC models. Power supply 230/50/1.
Fan motors are wired to a central connection box.
• Durable galvanized steel casing, powder coated RAL 9003. Dismountable and openable casing
for cleaning and inspecting purposes. Optimized driptray with rounded edges. Optigo SF31MC
and SF35MC models fitted with hinged side panels and driptray.
• Each heat exchanger is leak tested with dry air and finally supplied with a dry air pre-charge.
Fitted with Schrader valve on the suction connection for testing purposes.
• Delivered on a wooden pallet, either covered with a reinforced cardboard box or a wooden crate
(SF35MC models with 4 fans).

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Alfa LU-VE reserves the right to change specifications without prior notification.
2.3 Options
• Electric defrost in coil (E)
For cold rooms with room temperatures below 4 °C frost build-up is likely, the application of a
defrosting system is recommended. The stainless steel defrost elements are connected to
dedicated terminal box. Certified for the use of the only A2L refrigerants listed on the IEC stand-
ard 60335-2-40 (R-32, R-1234YF, R-1234ZE (E), R-444A, R-444B, R-447B, R-451A, R-451B,
R-452B, R-454A, R-454B, R-454C, R-455A)
• Driptray heater (HD)
• Electric defrost in coil + Driptray heater (E+HD)
Model Fin spacing N E HD E+HD
SF27MC all standard ✓✓✓
SF31MC 4.5, 6 standard ✓✓✓
SF31MC 7, 9 standard n.a. n.a. ✓
SF35MC all standard n.a. n.a. ✓
• Coil protection: Alupaint (AP)
• Fan shroud heater (FRH)
• Driptray insulation (IS)
• Insulated suction hood
2.4 Code description
SF27MC - 2 1 - 4 N AL BP - FRH
1 2 3 4 5 6 7 8
1 Optigo SFMC A2L safety compliant cubic commercial unit coolers
(SF27MC=Ø 275 mm, SF31MC=Ø 315 mm, SF35MC=Ø 350 mm)
2 Number of fans (1 to 4)
3 Coil type (1, 2)
4 Fin spacing (4=4.5, 6=6.0, 7=7.0, 9=9.0 mm)
5 Defrost system (N=air defrost, E=electrical defrost in coil, HD=driptray heater,
E+HD=electric defrost in coil+driptray heater)
6 Fin material (AL=aluminium, AP=pre-painted aluminium)
7 Packing (BP=box+pallet, CR=crate)
8 Options

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Alfa LU-VE reserves the right to change specifications without prior notification.
①
③
④
②
1. Flammable gas
Use of flammable gas.
⑤
3 Product labels
Manufactured by
SEST-LUVE-POLSKA sp. z. o. o.
ul. Wyczólkowskiego 30,
44-109 Gliwice, Poland
HEAT EXCHANGER
SF27MC-21-4 N ALBP-
CODE: 10232606
S/N: 7487840/2021
PED CAT I
Fluid: A2L-A1 GROUP
VOLUME: 6.00
dm3
Ts: -40 °C +55 °C
Max Pres: 2.4 MPa
VENTILATION
Nr. Motors: 2
PowerS: 230 V 50 Hz
180 W 0.8 A
N°
N°
MADE IN
POLAND
DEFROSTING
EXAMPLE
EXAMPLE
2. Product label
This label is positioned inside the casing.
Model Refer to paragraph "2.4
Code description"
Product code
Product Serial nr.
Communicate these when
ordering spare parts as
they identify the unit
PED Category According to PED
Fluid Refrigerant*
Volume Coil Volume
Ts Range of operating tem-
peratures for the coil
Max Pres Max working pressure
No Motors Number of fans
*Air defrost: A2L, A1 refrigerant group
Electric defrost: R-32, R-1234YF, R-1234ZE (E), R-444A, R-444B, R-447B,
R-451A, R-451B, R-452B, R-454A, R-454B, R-454C, R-455A, A1
Product code
Product serial nr.
Fluid
Volume
Ts
Max Pres
No. Motors
PED category
Model
⑥

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
3. Precharge warning
Units are delivered from the manufacturer
with an overpressure. Check pressure on the
Schrader valve. With unpressurised unit:
immediate report to manufacturer and note on
bill of delivery.
When installing the unit ensure the Schrader
valve is removed.
4. Electrical warning
Electrically powered component. Switch off
power supply before any maintenance or instal-
lation activity.
5. Refer to instruction manual
Manual must be carefully examined and instruc-
tions should be followed up at all times.
6. Eurovent
The Optigo SFMC series machines use the
same heat exchange components as the corre-
sponding Optigo FMC series models and pro-
vide the same performance. The Optigo SFMC
series machines can work with HFC category A1
refrigerants.

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
4 Transport and storage
During transportation the heat exchanger must be handled with all required care. Any instruction or
warning signs attached to the heat exchanger or the packaging must be followed. Avoid shocks or
continuous vibrations during transport. These may cause damage to the product. If required, con-
sult Alfa LU-VE and disassemble during transport any parts that are likely to be set into vibration.
Air heat exchangers must be adequately fixed on the transport vehicle. If temporary storage of the
heat exchanger is required, the following points should be observed:
• Store the heat exchanger in its packing, in a dry place with sufficient protection against sun and
other environmental influences.
• Always place air heat exchangers on an even surface.
• Do not stack air heat exchangers unless explicitly indicated this is allowed.
• Storage temperature between -40° C and +50 °C.
• Never open or remove the Schrader valves before unit installation. Overpressure in the coil must
be maintained.
Shelf life of air coolers is one year. If longer storage periods occur, check:
• Proper functioning of the fan motor.
• Mounting brackets, lifting lugs and fan fixings for corrosion.

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Place the unit on the ground and manually turn
the air cooler into mounting position on a second
wooden pallet. Keep the packaging material in
place to prevent the drip trays from damaging.
Remove the cardboard box.
Unscrew the fixings from the original support
pallet (now on top) and remove it.
The cooler is now in mounting position.
5.1 Units packed with cardboard box
SFMC models are delivered on a wooden pallet, either covered with a reinforced cardboard box or
a wooden crate (SF35MC models with 4 fans).
Handling and positioning can take place manually (smaller models) or with use of a forklift.
5 Unpacking and lifting
In order to avoid damage to the air cooler or fall-
ing of the unit, ensure that the lifting forks cover
all beams from the lower support pallet.
Packed air coolers may be stacked during trans-
portation (max. 2) and storage (max. 3). Respect
the maximum number of stacked air cooler units.
max. 3
max. 2
>50 mm

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
All lifting procedures must be carefully carried
out by properly qualified personnel, ensur-
ing absolute safety at all times. Lift the unit to
mounting position and secure following instruc-
tions given in chapter "6 Installation".
After having secured the cooler, the forks may
be lowered and the remaining packaging materi-
als can be removed.
5.3 Lifting
Ensure that the cooler is not lifted directly onto the drip tray or the finned coil. Utilizing the proper
wooden transport beams and/or pallets prevents the cooler bending at the extremes such that the
cooling circuit or other components are damaged.
5.2 Units packed with crate
Place the unit on the ground and loosen the fix-
ing materials from the top crate.
Remove top crate.
Unpacked coolers must be turned before mount-
ing.
Manually turn the air cooler into mounting posi-
tion on a second wooden pallet. Use adequate
protective material to prevent the driptray from
damaging. The cooler is now ready to be lifted
into mounting position.

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Alfa LU-VE reserves the right to change specifications without prior notification.
Model n. of fans
Dimensions (mm)
L A B C W H
SF27MC 1 680 412 - 298 365 461
SF27MC 2 1050 782 - 298 365 461
SF27MC 3 1420 1152 - 298 365 461
SF27MC 4 1790 1522 - 298 365 461
SF31MC 1 770 492 - 375 500 460
SF31MC 2 1220 942 - 375 500 460
SF31MC 3 1670 1392 - 375 500 460
SF31MC 4 2120 1842 - 375 500 460
SF35MC 1 870 597 - 375 525 530
SF35MC 2 1425 1152 - 375 525 530
SF35MC 3 1980 1707 - 375 525 530
SF35MC 4 2535 2262 1131 375 525 530
6 Installation
6.1 Mounting dimensions
3/4'' GAS
OUT
IN
20
10
L
H
W
B B
A
C
Coolers must be hung such that the coolers can contract and expand
somewhat. Cooler contraction occurs during refrigeration operation, and
cooler expansion occurs during defrost. For air coolers with copper tubing
this figure runs up to 1.65 mm per meter cooler length. All heat exchangers
must be set up level.
Weight information are listed on the product label and/or in the relevant
product documentation.
Detailed drawings showing all required mounting and refrigerant connection
dimensions are available available for download on alfa.luvegroup.com. Dimensional drawings

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Alfa LU-VE reserves the right to change specifications without prior notification.
6.2 Mounting bracket
Use suitable studs when mounting the unit to the
ceiling.
Fix the unit to cold room ceiling by securely
tightening nuts and washers.
6.3 Technical spaces
Heat exchangers should be positioned such that the following criteria are met:
• Adequate space must be left on the air inlet side of the heat exchanger. The air discharge side
should be free of restrictions. Recirculation of air is to be avoided.
• The heat exchangers should not be connected to ducting on either the air inlet side or discharge
side, unless the heat exchanger has been specifically designed for such an application.
It is important to remember that the total amount of heat to be dissipated depends on receiving the
full design air volume at the design entry air temperature which allows this air to be freely dis-
charged after passing through the heat exchanger. Any restrictions may impair the performance of
the cooler. If in doubt, please check with Alfa LU-VE.
Respect the minimum wall distance on suction
side.
Respect the minimum space for electric defrost
extraction and replacement.
Ø 10 mm
500 mm
min. A A
E

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Alfa LU-VE reserves the right to change specifications without prior notification.
6.4 Refrigerant connections
All pipework and connections must be made in accordance with good refrigeration design and
installation practice.
Before performing the connection, ensure that no flammable gas is present in the system and in the
product.
Ensure that no stresses are transmitted to the pipework. All pipework should be adequately
attached to the walls/ceilings of the cold room and not only to the cooler itself. Pipework must be
adequately supported to prevent vibration or external load on the cooler headers, etc.
Components that may cause gas leaks (for example pressure points) must not be installed inside
the product. All refrigeration connections must be made by brazing.
Do not adapt headers position to the suction line.
Ensure the supply circuit is closed (no pressure)
before connecting the suction lines.
Open side covers.
Connect the suction line line (L).
Ensure the flame nozzle is not aimed at the
equipment, when welding.
L
L
LL

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6.5 Cooler capacity check
Ts'=cold room air inlet temperature.
Te=evaporating temperature. It is related to the
refrigerant pressure on the unit cooler outlet.
Trs=refrigerant superheat temperature, on suc-
tion line near thermostatic valve bulb.
(Trs-Te)=superheat
(Trs-Te) ≤ 0.7 x (Ts'-Te)
Keep the superheat as low as possible to obtain
maximum unit cooler performance.
The thermostatic valve fitted must be correctly
sized for the installation conditions and adjusted
for correct system operation.
Connect the drain tubing (F) to the drain connec-
tion (G).
All pipework should be adequately attached to
the walls/ceilings of the cold room and not only
to the cooler itself.
6.6 Drain line
Check all drain lines and drip trays to ensure that no improper material such as, e.g., packaging
material blocks the drain.
Tighten drain connection by hand only.
The drain line diameter must be at least the size
of the driptray drain diameter and should be laid
with an adequate slope. For room temperatures
below 0 °C drain line insulation and defrosting
are required.
A syphon must be installed on the drain line, out-
side the cold room.
L
G
F
60°
TeTs' Trs
≥ 1.5 m

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Alfa LU-VE reserves the right to change specifications without prior notification.
6.7 Electrical connections
All electrical connections must be made in accordance with the locally valid regulations and in con-
formance with good installation practice. The site supply voltage, frequency, accepted power rating
and number of phases must comply with the details on the technical documentation. All electrical
supply lines must be connected to the terminal boxes through suitable waterproof glands using bot-
tom entry or, in case of horizontal installation, the cable is routed to form a water trap.
If the heat exchangers are installed and there is to be an appreciable delay in putting the plant into
operation, a temporary electrical supply should be connected to each motor, sufficient to run for
at least 4 hours. This procedure should be carried out at least once every 4 weeks, until the heat
exchanger is fully operational. It is up to the end user to verify the conditions for protection by auto-
matic disconnection of supply, according to applicable standards. Heat exchangers are designed
for TN power systems. The insulation fault protection must be part of power supply of the heat
exchanger and is not supplied by the manufacturer.
The following data determine which connection diagram is to be selected and respected for electri-
cal installation:
• Heat exchanger model indication
• Fan motor type
• Electrical options
When in doubt always contact your local supplier or Alfa LU-VE representative for assistance.
Ensure complete electrical isolation before performing any wiring.
In accordance with the current legislation,
install a single pole terminal in a visible position
between the unit and the power supply. Opening
between terminals 3 mm at min.
Remove the terminal block cover (M).
Insert the cables into the grommet (N) and
block them with their respective gland. Connect
terminals by following the wiring diagrams on the
cover. When all connections are made refit the
terminal block cover.
For systems using electrical defrost, a defrost
termination thermostat should be used, having a
range of 10 °C to 20 °C with a sensor attached
to the top return bends of the coil block or buried
in the top of the coil block fins (J).
motors
heaters
M
motors
M
heaters
P
P
N
J
Use only Atex certified thermostat, for use in explosive atmosphere.
Any electrical component not supplied with the appliance must be installed outside the unit.
6.8 Power failure
In order to avoid damage to the compressor, the refrigerant supply must be closed in the event of
power failure, e.g. by closing the magnetic valve. Safety measures elsewhere in the system will
prevent the pressure in the heat exchanger from exceeding the design pressure.

31481875EN-00
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.9 Fan motors connections
The maximum load of the motors and the recommended settings for the overload relays are to be
respected. The built-in thermal overload protection must be integrated in the control circuit when
a connection in the terminal box is present. The electrical control circuit should be arranged with
a manual reset device in order to prevent continuous on/off switching (tripping) of the motors.
Suppliers and manufacturers of electrical motors provide no guarantee for motors that are com-
busted through overload.
Ensure complete electrical isolation before performing any wiring.
1~230 V 50-60 Hz
Type Power supply Ø
Motor power consumption
n. of fans
1 2 3 4
EC 1~230 V - 50/60 Hz 275 28 W 0.2 A 56 W 0.4 A 84 W 0.6 A 112 W 0.8 A
EC 1~230 V - 50/60 Hz 315 66 W 0.6 A 132 W 1.2 A 198 W 1.8 A 264 W 2.4 A
EC 1~230 V - 50/60 Hz 350 143 W 1.2 A 286 W 2.4 A 429 W 3.6 A 572 W 4.8 A
L N PE PE N L L N PE PE N L L N PE PE N L L N PE PE N L

31481875EN-00
20
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Junction box - 2 speed
brown
grey
black
yellow/green
LINE 230/1
L-N-SL
low speed
L-N
high speed
LINE 230/1
fans
For SF31MC and SF35MC with EC motors: