CLIVET WiSAN-YEE1 45.4 User manual

M0I400002-00 02-23
WiSAN-YEE
45.4 - 85.4
Manual
for installation
use and maintenance

Dear Customer,
We congratulate you on choosing these product
Clivet has been working for years to oer systems able to assure the maximum
comfort for a long time with highly-reliable, ecient, high-quality and safe solutions.
The target of the company is to oer advanced systems, that assure the best comfort
and reduce energy consumption as well as the installation and maintenance costs for
the entire life-cycle of the system.
With this manual, we want to give you information that are useful for all phases: from
reception, installation and use to disposal - so that such an advanced system can
provide the best performances during installation and use.
Best regards and have a good read.
CLIVET Spa
The data contained in this manual is not binding and may be changed by the
manufacturer without prior notice. Reproduction, even is part, is FORBIDDEN
© Copyright - CLIVET S.p.A. - Feltre (BL) - Italy

Index
1. Safety considerations ........................................................................................... 6
1.1 Safety........................................................................................................................... 6
1.2 Manual......................................................................................................................... 6
1.3 Risk situations............................................................................................................ 6
1.4 Intended use.............................................................................................................. 6
1.5 Installation .................................................................................................................. 6
1.6 Maintenance .............................................................................................................. 6
1.7 Modification................................................................................................................ 6
1.8 Breakdown/Malfuction ............................................................................................ 6
1.9 User training............................................................................................................... 6
1.10 Data update ............................................................................................................... 6
1.11 Original instructions ................................................................................................. 6
2. Indications for the User ........................................................................................ 7
2.1 Breakdown/Malfuction ............................................................................................ 7
2.2 The installer must train the user, particularly on:.............................................. 7
2.3 Unit indentification ................................................................................................... 7
2.4 Serial number ............................................................................................................ 7
3. Information on refrigerant gas ............................................................................ 8
4. Before installation ................................................................................................. 9
4.1 Reception.................................................................................................................... 9
4.2 Storage........................................................................................................................ 9
4.3 Packaging removing ................................................................................................ 9
4.4 Handling...................................................................................................................... 9
5. Selecting the installation site .............................................................................. 10
5.1 General........................................................................................................................ 10
5.2 Functional spaces..................................................................................................... 10
5.3 Positioning.................................................................................................................. 10
5.4 Air flow-rate on the coils......................................................................................... 10
5.5 Saftey valve gas side............................................................................................... 10
5.6 Condensate water.................................................................................................... 11
6. Water connections................................................................................................. 12
6.1 Hydraulic system ...................................................................................................... 12
6.2 Water quality .............................................................................................................. 12
6.3 Cleanliness................................................................................................................. 12
6.4 New systems.............................................................................................................. 12
6.5 Existing systems........................................................................................................ 12
6.7 Anti-freeze solution.................................................................................................. 13
6.8 Water flow-rate.......................................................................................................... 13
6.9 Minimum system water content............................................................................ 13
6.10 Flow Switch ................................................................................................................ 13
6.11 Water filter .................................................................................................................. 14
6.12 Non-return valve ....................................................................................................... 14
6.13 Operation sequence................................................................................................ 14
6.14 Hydronic units and connection diagrams recommended ............................. 14
6.15 Standard unit.............................................................................................................. 15
6.16 Unit + pump................................................................................................................ 15
6.17 Unit + water tank....................................................................................................... 16

6.18 Unit + DHW valve...................................................................................................... 16
6.19 Unit in modular configuration................................................................................ 16
7. Electrical connections........................................................................................... 17
7.1 Electrical data ............................................................................................................ 17
7.2 Connections............................................................................................................... 17
7.3 Power supply network requirements .................................................................. 17
7.4 Signals / data lines ................................................................................................... 17
7.6 Controller wiring sections....................................................................................... 18
7.7 Remote ON-OFF ....................................................................................................... 18
7.8 Connections performed by Customer ................................................................ 19
8. Start-up ................................................................................................................... 21
8.4 Electric Circuit............................................................................................................ 24
8.5 Options........................................................................................................................ 24
8.6 Start-up report ........................................................................................................... 24
8.7 2014/68/UE PED directive...................................................................................... 24
9. Control .................................................................................................................... 25
9.3 Lock/Unlock keys ..................................................................................................... 25
9.4 Switch-On/Off ............................................................................................................ 25
9.5 Unit in modular configuration................................................................................ 25
9.8 Set MODE and TEMPERATURE ............................................................................ 27
9.9 Double setpoint......................................................................................................... 27
9.10 Snow protection function ....................................................................................... 27
9.11 Silent mode ................................................................................................................ 28
9.12 Domestic hot water.................................................................................................. 28
9.13 Querying variables ................................................................................................... 29
9.14 Timer ............................................................................................................................ 29
10. R32 gas safety warnings ...................................................................................... 34
10.1 Area checks ............................................................................................................... 34
10.2 Work procedures ...................................................................................................... 34
10.3 General work area.................................................................................................... 34
10.4 Check the presence of refrigerant....................................................................... 34
10.5 Presence of the fire extinguisher ......................................................................... 34
10.6 No ignition source .................................................................................................... 34
10.7 Ventilated area .......................................................................................................... 34
10.8 Cooling equipment checks .................................................................................... 34
10.9 Electrical device checks ......................................................................................... 34
10.10 Repairing sealed components .............................................................................. 34
10.11 Reparation of intrinsically safe components ..................................................... 35
10.12 Wires ............................................................................................................................ 35
10.13 Leak detection methods......................................................................................... 35
10.14 Removal and evacuation ........................................................................................ 35
10.15 Charging operations ................................................................................................ 35
10.16 Dismantling................................................................................................................. 36
10.17 Labelling...................................................................................................................... 36
10.18 Recovery ..................................................................................................................... 36
10.19 Transport, mark and storage ................................................................................. 36
11. Maintenance........................................................................................................... 37
11.1 Safety........................................................................................................................... 37
11.2 General........................................................................................................................ 37
11.3 Inspections frequency............................................................................................. 37
11.4 Unit booklet................................................................................................................ 37

11.5 Standby mode ........................................................................................................... 37
11.8 Compressor crankcase heater.............................................................................. 39
11.9 Water side exchanger.............................................................................................. 39
11.10 Water filter .................................................................................................................. 39
11.11 Flow Switch ................................................................................................................ 39
11.12 Circulation pumps..................................................................................................... 39
11.13 Insulations................................................................................................................... 39
11.14 Pressure relief valve ................................................................................................ 39
11.15 Structure...................................................................................................................... 39
11.16 Air side exchanger.................................................................................................... 39
11.17 Electric fans................................................................................................................ 40
11.18 Refrigerant leak detector........................................................................................ 40
12. Anti-vibration mounts ........................................................................................... 41
12.1 Anti-vibration mount support................................................................................. 41
13. Decommissioning.................................................................................................. 45
13.1 Disconnection............................................................................................................ 45
13.2 WEEE INFORMATION.............................................................................................. 45
14. Residual risks ......................................................................................................... 46
14.1 General........................................................................................................................ 46
14.2 Handling...................................................................................................................... 46
14.3 Installation .................................................................................................................. 46
14.4 General risks.............................................................................................................. 46
14.5 Electric parts .............................................................................................................. 46
14.6 Moving parts .............................................................................................................. 47
14.7 Refrigerant.................................................................................................................. 47
14.8 Hydraulic parts .......................................................................................................... 47
15. Unit in modular configuration.............................................................................. 48
15.1 Control logic............................................................................................................... 48
15.2 Tw control probe....................................................................................................... 48
15.3 Domestic hot water.................................................................................................. 48
15.4 Electrical connections ............................................................................................. 48
15.5 System with reversed return connection ........................................................... 48
15.8 Remote ON-OFF ....................................................................................................... 50
15.9 Start-up........................................................................................................................ 50
15.10 Alarms.......................................................................................................................... 50
16. Modbus ................................................................................................................... 51
17. Technical information ........................................................................................... 60

6
Safety considerations
1. Safety considerations
1.1 Safety
Operate in compliance with safety regulations in force.
To carry out the operations use protection devices:
gloves, goggles, helmet, headphones, protective knee
pads.
All operations must be carried out by personnel trained
on possible risks of a general nature, electrical and
deriving from operating with equipment under pressure.
Only qualified personnel can operate on the unit, as
required by the regulation in force.
1.2 Manual
The manual provides correct unit installation, use and
maintenance.
It is advisable to read it carefully so you will save time
during operations.
Follow the written indications so you will not cause
damages to things and injuries people.
The manual must be delivered to the User.
1.3 Risk situations
The unit has been designed and created to prevent
injures to people.
During designing it is not possible to plane and operate
on all risk situation.
Read carefully “Residual risk” section where all situation
which may cause damages to things and injuries to
people are reported.
Installation, starting, maintenance and repair required
specific knowledge; if they are carried out by
inexperienced personnel, they may cause damages to
things and injuries people.
1.4 Intended use
Use the unit only:
• for cooling/heating water or a water and glycol mix
• keep to the limits foreseen in the technical
schedule and in this manual
The manufacturer accepts no responsibility if the
equipment is used for any purpose other than the
intended use.
1.5 Installation
⊲ Outdoor installation
The positioning, hydraulic system, refrigerating, electrics
and the ducting of the air must be determined by the
system designer in accordance with local regulations in
force.
Follow local safety regulations.
Verify that the electrical line characteristics are in
compliance with data quotes on the unit serial number
label.
1.6 Maintenance
Plan periodic inspection and maintenance in order to
avoid or reduce repairing costs.
Turn the unit o before any operation.
1.7 Modification
All unit modifications will end the warranty coverage and
the manufacturer responsibility.
1.8 Breakdown/Malfuction
Disable the unit immediately in case of breakdown or
malfunction.
Contact a certified service agent.
1.9 User training
The installer has to train the user on:
• Start-up/shutdown
• Set points change
• Standby mode
• Maintenance
• What to do / what not to do in case of breakdown
1.10 Data update
Continual product improvements may imply manual data
changes.
Visit manufacturer web site for updated data.
1.11 Original instructions
The original instructions are written in Italian.
All other languages are translations of the original
instructions.

7
Indications for the User
2. Indications for the User
Keep this manual with the wiring diagram in an accessible
place for the operator.
Note the unit data label so you can provide them to
the assistance centre in case of intervention (see “Unit
identification” section).
Provide a unit notebook that allows any interventions
carried out on the unit to be noted and tracked making it
easier to suitably note the various interventions and aids
the search for any breakdowns.
2.1 Breakdown/Malfuction
Disable the unit immediately in case of breakdown or
malfunction.
Contact a certified service agent.
Use original spares parts only.
Using the unit in case of breakdown or malfunction:
• voids the warranty
• it may compromise the safety of the unit
• may increase time and repair costs
2.2 The installer must train the user, particularly
on:
• Start-up/shutdown
• Set points change
• Standby mode
• Maintenance
• What to do / what not to do in case of breakdown
2.3 Unit indentification
The serial number label is positioned on the unit and
allows to indentify all the unit features.
The matriculation plate shows the indications foreseen by
the standards, in particular:
• unit type
• serial number (12 characters)
• year of manufacture
• wiring diagram number
• electrical data
• type of refrigerant
• refrigerant charge
• manufacturer logo and address
The matriculation plate must never be removed.
2.4 Serial number
It identifies uniquely each unit.
Must be quoted when ordering spare parts.
2.5 Assistance request
Note data from the serial number label and write them
in the chart on side, so you will find them easily when
needed.
Range
Size
Serial number
Year of production
Wiring diagram number

8
Information on refrigerant gas
3. Information on refrigerant gas
WARNING
⊲ This product contains fluorinated greenhouse gases
covered by the Kyoto protocol.
⊲ Do not discharge gas into air.
Refrigerant characteristics
Type of refrigerant R32
Safety class (ISO 817) A2L
GWP 675
NOTE
⊲ The refrigerant quantity is indicated on the unit plate

9
Before installation
4. Before installation
4.1 Reception
You have to check before accepting the delivery:
• That the unit hasn’t been damaged during transport
• That the materials delivered correspond with that
indicated on the transport document comparing the
data with the identification label positioned on the
packaging.
In case of damage or anomaly:
• Write down on the transport document the damage
you found and quote this sentence: “Conditional
acceptance clear evidence of deficiencies/damages
during transport”
• Contact by fax and registered mail with advice of
receipt to supplier and the carrier.
WARNING
⊲ Any disputes must be made within 8 days from the
date of the delivery. Complaints after this period are
invalid.
4.2 Storage
Observe external packaging instructions.
In particolar:
minimum ambient temperature (A) -20°C
maximum ambient temperature (B) +49,5°C
maximum relative humidity (C) 95%
Failure to comply with the above conditions can lead to:
A possible components damages
B possible safety valve opening
C possible damages to electrical components
WARNING
⊲ The unit may not be tilted more than 15° during
transport.
4.3 Packaging removing
Be careful not to damage the unit.
Recycle and dispose of the packaging material in
conformity with local regulations.
4.4 Handling
ATTENTION
⊲ Check that all handling equipment complies with
local safety regulations (cran, forklifts, ropes, hooks,
etc.).
⊲ Provide personnel with personal protective
equipment suitable for the situation, such as helmet,
gloves, accident-prevention shoes, etc.
⊲ Observe all safety procedures in order to guarantee
the safety of the personnel present and the of
material.
⊲ Verify unit weight and handling equipment lifting
capacity.
1 Identify critical points during handling (disconnected
routes, flights, steps, doors
2 Protect the unit properly to prevent damage
3 Lifting with balance
4 Lifting with spacer bar
5 Align the barycenter to the lifting point
• Gradually bring the lifting belts under tension,
making sure they are positioned correctly
• Before starting the handling, make sure that the
unit is stable.

10
Selecting the installation site
5. Selecting the installation site
5.1 General
Installation must be in accordance with local regulations.
If they do not exist, follow EN378 .
⊲ Maximum altitude for installation: 1000m.
During positioning consider these elements:
• customer approval
• unit weight and bearing point capacity
• safe accessible position
• functional spaces
• spaces for the air intake/exhaust
• Electrical connections
• max. distance allowed by the electrical connections
• Water connections
5.2 Functional spaces
Functional spaces are designed to:
• guarantee good unit operation
• carry out maintenance operations
• protect authorized operators and exposed people
ATTENTION
⊲ Respect all functional spaces indicated in the
DIMENSIONS section.
⊲ Do not smoke or use open flames within this area
5.3 Positioning
ATTENTION
⊲ Do not go up to the surface
⊲ Do not place heavy loads.
Units are designed to be installed:
• in fixed positions
• level
Put the unit in a position where any leaking gas cannot
enter buildings or stagnate in closed areas. In the latter
case, observe the rules for machinery rooms (ventilation,
leak detection, etc.).
Choose the installation place according to the following
criteria:
• avoid installations in places subject to flooding
• install the unit raised from the ground
• bearing points aligned and leveled
• discharged condensation water must not cause harm/
danger to people and property
• the accumulation of snow must not cause clogging of
the coils
Limit vibration transmission:
• use anti-vibration devices or neoprene strips on the
unit support points
• install flexible joints on the hydraulic and aeraulic
connections
Protect the unit with suitable fence in order to avoid
access to unauthorised personnel (children, vandals, etc.)
5.4 Air flow-rate on the coils
ATTENTION
⊲ The air flow must not be obstructed
A correct circulation of the air is mandatory to guarantee
the good unit operating.
Avoid therefore:
• obstacles to the airflow
• diculty of exchange
• leaves or other foreign bodies that can obstruct the air
coil
• winds that hinder or favour the airflow
• heat or pollution sources close to the unit (chimneys,
extractors etc..)
• stratification (cold air that stagnates at the bottom)
• recirculation (expelled air that is sucked in again)
• incorrect positioning, close to very high walls, attics
or in angles that could give rise to stratification or
recirculation phenomenons
Ignoring the previous indications could:
• reduce energy eciency
• alarm lockout due to HIGH PRESSURE (in summer) or
LOW PRESSURE (in winter)
5.5 Saftey valve gas side

11
Selecting the installation site
The installer is responsible for evaluating the opportunity
of installing drain tubes, in conformity with the local
regulations in force (EN 378).
If ducted, the valves must be sized according to EN13136.
5.6 Condensate water
Only units in heat pump version.
When a heat pump is running it produces a considerable
amount of water due to the defrosting cycles of the
external coil.
The condensate must be disposed in order to avoid
damages to people and things.

12
Water connections
6. Water connections
6.1 Hydraulic system
The pipes must be designed and manufactured to
limit pressure drops asmuch as possible, i.e. optimise
performance of the system.
Keep the following parameters to a minimum:
• overall length
• number of bends
• number of vertical changes of direction
6.2 Water quality
The water quality must be checked by qualified
personnel.
Water with inadequate characteristics can cause:
• pressure drop increase
• reduces energy eciency
• increased corrosion potential
Water features:
• within the limits indicated by table
Provide a water treatment system if values fall outside the
limits.
6.3 Cleanliness
Before connecting the water to the unit, clean the system
thoroughly with specific products eective to remove
residues or impurities that may aect functioning. Existing
systems must be free from sludge and contaminants and
protected against build-ups.
6.4 New systems
In case of new installations, it is essential to wash the
entire installation (with the circulator uninstalled) before
commissioning the central installation. This removes
residues of the installation process (welding, waste, joint
products...).
The system must then be filled with clean high-quality tap
water.
6.5 Existing systems
If a new unit is installed on an existing system, the system
must be rinsed to avoid the presence of particles, sludge
and waste.
The system must be drained before installing the new
unit.
Dirt can be removed only with a suitable water flow.
Particular attention must also be paid to “blind spots”
where a lot of dirt can accumulate due to the reduced
water flow.
If, after rinsing, the quality of the water is still unsuitable, a
few measures must be taken to avoid problems.
An option to remove pollutants is to install a filter.
ATTENTION
⊲ The warranty does not cover damages caused by
limestone formations, deposits and impurities from
the water supply and/or from failure to clean the
systems.
Water component for corrosion limit on Copper
PH (25°C) 7,5 ÷ 9,0
SO4-- < 100
HCO3- / SO4-- > 1
Total Hardness 8 ÷ 15 °f
Cl- < 50 ppm
PO4 3- < 2,0 ppm
NH3 < 0,5 ppm
Free Chlorine < 0,5 ppm
Fe3 + < 0,5 ppm
Mn++ < 0,05 ppm
CO2 < 50
H2S < 50 ppb
Oxygen content < 0,1 ppm
Sand 10 mg/L
Ferrite hydroxide Fe3O4
(black)
Dose < 7.5 mg/L 50% of mass
diameter < 10 µm
Iron oxide Fe2O3 (red) Dose < 7.5mg/L Diameter <
1 µm
Electrical conductivity
(µS/cm) <500
Sodium nitrate (mgNaNo3/l) <100
Alkalinity(mgCaCo3/l) <100
Copper (mgCu/l) <1.0
Sulphide ion (S-/l) None
Ammonium ion (mgNH4+/L) <1.0
Silica (mgSiO2/l) 50
Max Ethylene, Propylene
glycol 50%
Nitrates <100
Free&aggressive Carbonic
Acid <5

13
Water connections
6.6 Risk of freezing
If the unit or the relative water connections are subject to
temperatures close to 0°C:
• mix water with glycol, or
• safeguard the pipes with heating cables placed under
the insulation, or
• empty the system in cases of long non-use
6.7 Anti-freeze solution
The use of an anti-freeze solution results in an increase in
pressure drop.
Make sure that the glycol type utilized is inhibited
(not corrosive) and compatible with the water circuit
components.
Do not use dierent glicol mixture (i.e. ethylene with
propylene).
ATTENTION
⊲ The unit must always be protected from freeze.
Otherwise irreversible damage may occur.
% GLYCOL ETHYLENE / PROPYLENE
BY WEIGHT
5% 10% 15% 20% 25% 30% 35% 40% 45% 50%
Freezing temperature
°C -2 -3.9 -6.5 -8.9 -11.8 -15.6 -19.0 -23.4 -27.8 -32.7
Safety temperature
°C 3 1 -1 -4 -6 -10 -14 -19 -23.8 -29.4
6.8 Water flow-rate
The project water-flow must be:
• inside the exchanger operating limits (see the
TECHNICAL INFORMATION section)
• guarantee, also with variable system conditions (for
example in systems where some circuits are bypassed
in particular situations).
If the system capacity is below the minimum flow, bypass
the system as indicated in the diagram.
If the system capacity exceeds the minimum flow, bypass
the system as indicated in the diagram.
6.9 Minimum system water content
Minimum system water volumes are described within
chapter TECHNICAL DATA and they have to be satisfied
for a proper functioning of the unit.
6.10 Flow Switch
The flow switch must be present to ensure shutdown of
the unit if water is not circulating.
It has to be installed in a duct rectilinear part, not in
proximity of curves that cause turbulences.

14
Water connections
6.11 Water filter
Must be installed immediately in the water input of the
unit, in a position that is easily accessible for cleaning.
The filter must have an adequate mesh to prevent the
entry of particles grater that:
plate exchanger (mm) 1,6
ATTENTION
⊲ The filter never should be removed, this operation
invalidates the guaranty.
6.12 Non-return valve
Provide for the installation of non-return valves (A) in the
case of several units connected in parallel.
6.13 Operation sequence
Before starting the unit pump:
1 Close all vent valves in the high points of the unit
hydraulic circuit
2 Close all drain shut-o valves in the low points of
the unit’s water circuit
exchangers
pumps
collectors
storage tanks
3 Carefully wash the system with clean water: fill and
drain the system several times.
4 use the bypass to exclude the exchanger from the
flow (diagram on the previous page)
5 fill and empty the system multiple times.
6 Apply additives to prevent corrosion, fouling,
formation of mud and algae.
7 Fill the plant
8 do not use the unit pump.
9 Execute leakage test.
10 Isolate the pipes to avoid heat dispersions and
formation of condensate.
Leave various service points free (wells, vents, etc).
ATTENTION
⊲ Neglecting the washing will lead to several filter
cleaning interventions and at worst cases can cause
damages to the exchangers and the other parts.
6.14 Hydronic units and connection diagrams
recommended
The installer must define:
• type of components
• position in the system
See diagrams on the next pages.

15
Water connections
6.15 Standard unit 6.16 Unit + pump
11
12
13
14
15
16
O
P
T
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C
U
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1
2
T3
4
T
5
6
U
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7
8
9
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12
13
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15
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1
2
T3
4
T
5
6
U
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A
C
B
D
17
1 Exchanger
2 Antifreeze heater
3 Water temperature probe
4 Drain
5 dierential pressure switch
6 vent
7 system load safety pressure switch
8 pump
9 safety valve
10 inertial tank
11 shut-o valves
12 filter
13 flexible couplings
14 piping supports
15 Exchanger chemical cleaning bypass
16 system washing bypass (interlock closed during
operation)
17 pressure gauge
7, 9, 17
Components on board the unit only if the unit is equipped with pumps; otherwise the supply of these
is the responsibility of the Customer.

16
Water connections
6.17 Unit + water tank 6.18 Unit + DHW valve
7
8
9
10
12
13
14
15
16
O
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T3
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17 7
8
9
10
12
13
14
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16
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1
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T3
4
T
5
6
U
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T
11
17
1 Exchanger
2 Antifreeze heater
3 Water temperature probe
4 Drain
5 dierential pressure switch
6 vent
7 system load safety pressure switch
8 pump
9 safety valve
10 inertial tank
11 shut-o valves
12 filter
13 flexible couplings
14 piping supports
15 Exchanger chemical cleaning bypass
16 System washing bypass (interlock closed during
operation)
17 pressure gauge
7, 9, 17
Components on board the unit only if the unit is equipped with pumps; otherwise the supply of these
is the responsibility of the Customer.
6.19 Unit in modular configuration
See specific chapter at the end of the manual.

17
Electrical connections
7. Electrical connections
The characteristics of the electrical lines must be
determined by qualified electrica personnel able to
design electrical installations; moreover, the lines must be
in conformity with regulations in force.
The protection devices of the unit power line must be
able to stop all short circuit current, the value must be
determined in accordance with system features.
The power cables and the protection cable section must
be defined in accordance with the characteristics of the
protections adopted.
All electrical operations should be performed by trained
personnel having the necessary qualifications required
by the regulations in force and being informed about the
risks relevant to these activities.
Operate in compliance with safety regulations in force.
7.1 Electrical data
The serial number label reports the unit specific electrical
data, included any electrical accessories.
The electrical data indicated in the technical bulletin
and in the manual refer to the standard unit, accessories
excluded.
The matriculation plate shows the indications foreseen by
the standards, in particular:
Voltage
F.L.A.: full load ampere, absorbed current at maximum
admitted conditions
F.L.I.: full load input, full load power input at max.
admissible condition
Electrical wiringdiagram Nr.
7.2 Connections
1 Refer to the unit electrical diagram (the number of the
diagram is shown on the serial number label).
2 Verify that the electrical supply has characteristics
conforming to the data shown on the serial number
label.
3 Before starting work, ensure the unit is isolated,
unable to be turned on and a safety sign used.
4 Ensure correct earth connection.
5 Ensure cables are suitably protected.
6 Prevent dust, insects or rodents from entering the
electrical panel as they can damage components
and cables.
7 Use the special holes on the bottom of the frame
for the power line inlet. Seal any residual openings
to prevent noise from escaping the compressors
compartment.
8 Fix the cables: if vacated, they may be subject to
tearing.
9 The cables must not touch the compressor and the
refrigerant piping ( they reach high temperatures ).
10 Do not drill holes in the electrical panel.
11 Alternatively, restore the IP rating with watertight
systems.
12 Before power the unit, make sure that all the
protections that were removed during the electrical
connection work have been restored.
7.3 Power supply network requirements
1 The short circuit capacity of the line must be less than
10 kA
2 The units can only be connected to TN, TT
distribution systems
3 Voltage 400-3-50 +/-10%
4 Phase unbalance < 2%
5 Harmonic distortion less than 12% (THDv<12%)
6 Voltage interruptions lasting no longer than 3ms
and with at least 1 s between each one
7 Voltage dips not exceeding 20% of the RMS value,
lasting no longer than a single period (50Hz) and
with at least 1 s between each dip.
8 Leakage current exceeding 10 mA and installation
in accordance with Section 8.2.6 of the standard.
9 Earth cable as specified in the table:
Cross-section of the line
conductors (mm²)
Minimum cross-section of
the protective conductor
(PE) (mm²)
S ≤ 16 S
16 < S ≤ 35 16
S > 35 S/2
7.4 Signals / data lines
Do not exceed the maximum power allowed, which
varies, according to the type of signal.
Lay the cables far from power cables or cables
having a dierent tension and that are able to emit
electromagnetic disturbances.
Do not lay the cable near devices which can generate
electromagnetic interferences.
Do not lay the cables parallel to other cables, cable
crossings are possible, only if laid at 90°.
The type of cable must be suitable for RS-485 serial data
communication.
A 3-pole shielded bus cable is required.
The data transmission bus cable must be verified
according to the type of installation in which it will be
placed and must comply with local standards.
The bus cable must comply with non-prescribed local
electrical standards (e.g. insulation, voltages, flame

18
Electrical connections
propagation, etc.).
The cable shield must be grounded at a single point free
from disturbances.
In order to ensure correct communication, the earth
connection of the shield can also be configured
dierently depending on the area and the types of
interference.
Allowed topology: daisy-chain (enter and exit).
Other types such as "ring" or "star" are not allowed.
Do not use cable lugs on the communication bus.
7.5 Power line inlet.
7.6 Controller wiring sections
45.4 50.4 55.4 60.4 65.4
Cu cable cross-section (mm2) 35 - 90 35 - 90 95 - 240 95 - 240 95 - 240
Tightening torque (Nm) 9 9 20 20 20
70.4 75.4 80.4 85.4
Min. cable section Cu (mm2) 95 - 240 185 - 240 185 - 240 185 - 240
Tightening torque (Nm) 20 20 20 20
7.7 Remote ON-OFF
Do not perform short On-O cycles.
Do not use the remote On-O with a thermoregulation function.

19
Electrical connections
7.8 Connections performed by Customer
Function Terminal block
Connector Terminals Type of contact
System load pressure
switch
Connect only if standard
unit without pumps on
board
WP.-SW XT2 13
gnd
Cooling
Heating
COOL/HEAT XT2 14
gnd
On - O ON/OFF XT2 15
gnd
2nd setpoint TEMP-SW XT2 20
gnd
Connection bus for units
in multiple configuration
MideaBus XT2
5 - X
6 - E
7 - Y
Signalling alarm Alarm CN85 max 240V AC
5A
Heating elements KM1 CN26 Heat1
Com
max 240V AC
5A
Heating elements KM2 CN26 Heat2
Com
max 240V AC
5A
Compressor status HL1 CN33 max 240V AC
5A
Compressor status HL2 CN33
slave board
max 240V AC
5A

20
Electrical connections
7.9 Use remote keypad control
The keypad is wired on the unit
It can be disassembled and installed remotely.
Connection up to 40 m.
Power supply provided by the unit.
Connection up to 300 m.
Separate power supply.
Power output provided with the unit.
7.10 Modbus