Veco CLIMMA CWS DC INVERTER Series Setup guide

Installation, usage and
maintenance manual
CLIMMA CWS
DC
INVERTER
Rev. 14
11
04

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Table of Contents
1. Introduction .................................................................................................................................................................................................... 3
1.1. General information .......................................................................................................................................................................... 3
1.2. System features ................................................................................................................................................................................... 3
1.3. Installation ............................................................................................................................................................................................ 4
1.4. Transport and handling ................................................................................................................................................................... 4
1.5. Unpacking ............................................................................................................................................................................................. 4
1.6. Directives ............................................................................................................................................................................................... 4
1.7. General safety ...................................................................................................................................................................................... 4
2. Installation ....................................................................................................................................................................................................... 5
2.1. Climma DC chiller positioning ...................................................................................................................................................... 5
2.2. Electronic control box and display .............................................................................................................................................. 5
2.3. Flow switch installation ................................................................................................................................................................... 5
2.4. Grounding ............................................................................................................................................................................................. 5
2.5. Chiller condensate ............................................................................................................................................................................. 6
2.6. Other system components: fancoils ........................................................................................................................................... 6
2.7. Other system components: sea water circuit .......................................................................................................................... 6
2.8. Other system components: fresh water circuit ...................................................................................................................... 7
2.9. Electrical connections ....................................................................................................................................................................... 8
2.10. Installation checks ........................................................................................................................................................................ 8
3. Operating instructions ................................................................................................................................................................................ 9
3.1. The electrical control box ................................................................................................................................................................ 9
3.2. The display ............................................................................................................................................................................................ 9
3.3. Modes of operation ........................................................................................................................................................................... 9
3.4. Climma functions ............................................................................................................................................................................ 10
3.5. Starting the unit ............................................................................................................................................................................... 10
3.6. Shut off procedure .......................................................................................................................................................................... 11
3.7. Switching between modes .......................................................................................................................................................... 11
3.8. Programming .................................................................................................................................................................................... 11
3.9. Warnings and errors ....................................................................................................................................................................... 12
3.10. System information ................................................................................................................................................................... 12
4. Maintenance and cleaning ..................................................................................................................................................................... 14
4.1. Basic maintenance .......................................................................................................................................................................... 14
4.2. Extended maintenance ................................................................................................................................................................. 14
4.3. Winterization ..................................................................................................................................................................................... 14
5. Warnings, alarms and troubleshooting ............................................................................................................................................. 15
5.1. Warnings and alarms ..................................................................................................................................................................... 15
5.2. Basic troubleshooting.................................................................................................................................................................... 20

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1. Introduction
1.1. General information
Thank you for purchasing a Climma CWS system!
This manual will provide necessary information for the proper installation, operation, and maintenance of
your Climma system.
Climma chiller and products are designed and produced to the highest standards and they are all tested
in the factory. If your Climma system is used according to the guidelines in this manual, it will guarantee
you trouble free operation for many years.
If you require assistance, please contact one of our many authorized service centers. To find the service
center please check our website www.veco.net or write us at customers[email protected].
WARNING
This unit should only be used for the purposes for which it was designed. The manufacturer declines all
responsibility for any damage caused by incorrect or unreasonable use, such as:
 improper use by untrained persons;
 technical modifications or operations not suited to specific models;
 use of non-original or non-specific spare parts;
1.2. System features
Following the main features of the Climma DC chillers:
 Variable Output from a Single Air-conditioning Unit. Depending on the heat load requirements,
the compressor frequency varies controlling the output capacity, to produce faster cooling and
heating, significantly improving the comfort on-board.
 Water Cooled Inverter Compressor. Climma’s water cooled inverter protects the DC brushless
compressor from excessive temperature, current overload and irregular voltage supply, allowing
it to be installed in the engine room without additional ventilation. Added to this, the electronic
control provides continuous monitoring of the compressor curve to keep the unit within safe
operating limits, eliminating also stop-start cycles.
 Eco mode. This function has been specifically developed to optimize the power consumption of
the system in three principle ways: it enables the chiller to work more efficiently with a smaller
output generator than would ideally be required; in ECO mode the power consumption is further
reduced during night operation when only a courtesy/night generator is working running and
less power is needed; ECO mode allows the air-conditioning to run while on the dock with a
limited shore power supply.
 No Start Load. By using a DC compressor with inverter the Climma compressor starts at a low
frequency requiring a fraction of the power.
 Up to 50% energy saving
A Climma centralized air-conditioning system includes different products: the Climma DC chiller, fancoils
installed in each cabins, fresh water piping that connects the chiller to the fancoils, sea water piping
bringing sea water to the chiller condenser, the fresh and the sea water pumps.
While the Climma system is running in cool mode, the Climma DC chiller is cooling the fresh water that
circulates in the fresh water circuit to the fancoils; heat is removed from the cabins through fancoils,
blowing fresh air into the cabins.
While in heat mode (reverse cycle mode), the Climma DC chiller is heating the fancoil water circuit that
brings heated water to the fancoils, allowing them to blow heated air in the cabins.

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DC50: The Climma DC chiller is designed for boats that require a load up to 50.000 Btu/h, which means
that in standard conditions, it is suited for motor boat from 50’ up to 65’ (15-20 meters) and sailing boats
between 60’ and 70’ (18-22 meters).
1.3. Installation
The unit must be installed by an authorized Climma service center and in compliance with the
instructions given in this manual.
1.4. Transport and handling
When loading or unloading the unit, use a fork lift equipped with forks at least 2/3 the length of the
shipping base.
Use an overhead lift if the unit is equipped with lifting eye-bolts.
Select lifting equipment suited to the weight and overall dimensions of the packaged unit or
components.
Take every precaution to prevent damage, when handling the unit or components keeping in
compliance with the information given on the packaging material.
1.5. Unpacking
Remove all cardboard, wood or other materials from the wood base. Lift the unit or components by
suitable means (e.g. lift truck), remove the wood base, then set the unit or components into position.
Once all packing material has been removed, check that the unit has not been damaged in any way.
Caution: Wear protective gloves when handling any packing materials and the wood base. Dispose of all
packaging materials appropriately in accordance to local codes.
1.6. Directives
Climma DC chillers respect the following directives.
 CE
 Low voltage: 2006/95/EC
 Electromagnetic Compatibility: 2004/108/EC
 Machinery Directive: 2006/42/CE
 Manufacturing quality Standards UNI EN ISO 9001:2008
1.7. General safety
Injuries or accidents caused by failure to comply with the recommendations of this manual are solely the
responsibility of the unit operator.
Basic Rules for Safe Operation:
 do not touch the unit with moist or wet hands or feet;
 never operate the unit while barefoot;
 before installation and maintenance operations, disconnect the unit from the power supply.
failure to comply may result in injury or death;
 installation and maintenance of this system can be hazardous due to system working pressure
and electrical components. Only a Climma certified service center should install and maintain the
system;
 to minimize the hazard of electrical shock and personal injury, this component must be
effectively grounded;
 during installation and maintenance follow safety codes, wear safety glasses and work gloves;

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2. Installation
WARNINGS
 Failure to follow all the instructions in this manual can cause property damage, injury or death.
 Improper installation, adjustment or alteration can cause property damage, injury or death.
 Electrical connections should be performed only by a certified professional.
 Electrical and grounding connections must comply with the National Electric Code and local
electric codes. Failure to comply with this procedure can cause property damage, injury or death.
 Before connecting the unit to the electrical supply, verify that the electrical connection agrees
with the specifications on the data plate, placed on the main electrical box of the unit. Failure to
comply with this procedure can cause property damage, injury or death.
 This appliance must be connected to a grounded, metal, permanent wiring system. Failure to
comply with this procedure can cause property damage, injury or death.
2.1. Climma DC chiller positioning
The Climma DC chiller must be installed in the engine room, technical space or similar area.
Normal engine room temperatures will not affect the Climma DC chiller, since the condenser and inverter
are water cooled. Climma DC chiller does not require additional ventilation during operation.
The unit must be accessible for service.
The unit must be secured on a surface using the mounting brackets below the drain pan.
WARNINGS
The Climma DC chiller is provided with an inverter mounted on the unit (VDF - Variable Frequency Drive) .
The inverter is IP20, therefore the Climma DC chiller must be installed where it would not get wet.
2.2. Electronic control box and display
The electronic control box of the Climma DC chiller is already completely connected to the chiller.
The control box has to be installed close enough to the chiller, due to the connection to the unit, and to a
flat horizontal or vertical surface.
The control box has to be installed in a location free from water, water spray and moisture and it has to
be accessible for operation and maintenance.
The standard version has the display on the control box itself, but the display can be also remote.
If the display is remote, the distance between the control box and the display has to be:
 50 meters with standard cable
 500 meters with AWG22 twisted pair cable. Note: please contact Veco if you plan to install the
display at a distance exceeding 50mt.
2.3. Flow switch installation
Flow switch has to be connected to the electronic control box and it needs to be installed in the fancoil
water circulation system.
Please refer to instruction C897 for the correct installation.
WARNING: Failure to properly install the flow switch will void the warranty on the Climma DC chiller.
2.4. Grounding
The Climma DC chiller has to be properly grounded to prevent corrosion due to stray current.

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WARNING: Failure to properly ground the Climma DC chiller will void warranty.
2.5. Chiller condensate
Every Climma DC chiller has two drains for condensate water.
At least one drain has to be properly connected to ensure the correct condensate water drainage.
Plastic condensate drain nipples are provided in a separate plastic bag to help the installation.
2.6. Other system components: fancoils
Climma fancoils have to be installed in a technical space inside or close to the cabin they have to
cool/heat.
Fancoils need to be properly secured on a leveled surface in order to operate correctly and remove the
condensation. Return air flow from the fancoil has to be ensured as well as the supply air flow from the
fancoil.
WARNING
No fancoil has to be installed close to engine room area and it must be ensured that no vapor or air from
the engine room can enter in the return air flow of the fancoil.
The positioning of the fancoil display is important. The temperature sensor is mounted on the display,
therefore the display has to be mounted on an inside wall, around the mid-height of the cabin where the
air can circulate so that it can sense the correct temperature.
If a correct positioning is not possible, a remote temperature sensor can be mounted; in this case, the
sensor must be placed behind the return air grill. In this case, the display temperature sensor will be
automatically excluded.
WARNING
Do not place the temperature sensor on the supply air flow or close to return/supply grills, under the
sunlight or close to heating devices.
Ducting of the return and supply air of the fancoil has to be done properly; ducts must be short and as
straight as possible, avoiding bends greater than 90° or loops.
Supply air ducting has to be at least 1.5 meter (5’) in order to reduce fan motor noise, but it should not
exceed 6 meters in order to reduce pressure drops.
Supply and return grills must be located not too close to each other, in order to avoid the supply air to
enter directly in the return air flow. Return grill should be placed below while supply grill should be
placed over the mid-height, as high as possible in the cabin.
WARNING
Failure to proper position the supply and return grills will cause no mixing between the cooler
temperatures and the warmer temperatures.
All Climma fancoils are provided with condensate drains to remove condensation produced by the
fancoil; condensation can reach 2 liters per hour, therefore condensate drains must be properly
connected and tested during installation. Drains should be as short and as downhill as possible, with no
loops and bends.
To test it, pour some water in the fancoil pan and check that all water flows out of the pan through the
drains.
2.7. Other system components: sea water circuit
The Climma DC chillers have a water cooled condenser therefore they need to be connected to sea water
to operate correctly.

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The sea water circuit includes: a sea water pump sized according to the chiller capacity, a sea water intake
and outlet and a sea water strainer.
The sea water in the circuit should not exceed 0.6 m3/h every 12.000 Btu/h (2,64 GPM or 10 lt/m per 1
TON) of chiller capacity.
Chiller rated capacity is guaranteed at 20°C (68°F) sea water temperature; the system will work in cool
mode up to 40°C (104°F) and in cool mode with a sea water temperature up to 5°C (41°F).
The sea water circuit must always have an uphill incline from the sea water inlet to the chiller condenser
to prevent the system to run properly. All hoses should be installed as straight as possible with no loops
and bends.
All metal components of the sea water circuit must be properly grounded.
SEA WATER PUMP
The sea water pump has to be properly secured on a leveled surface in order to operate correctly; Use the
special fixing kit with anti-vibration supports.
The sea water pump has to be installed below the water line in order to operate correctly.
SEA WATER INTAKE
Sea water intake has to be installed as far below the water line to ensure always that no air enters the sea
water circuit.
SEA WATER STRAINER
Sea water strainer has to be installed between the sea water intake and the sea water pump and it must
be accessible for cleaning operations. The strainer has to be cleaned periodically.
WARNING: Sea water strainer is mandatory in the seawater circuit. Failure to install the sea water strainer
will void the warranty.
SEA WATER OUTLET
The sea water outlet has to be installed above the sea water line, but as close as possible to it to reduce
noises.
2.8. Other system components: fresh water circuit
The fresh water circuit is a closed loop bringing water from the chiller to the fancoils and then back to the
chiller again. The circuit has the following components: a fresh water pump, flow switch, manifolds,
hoses, an expansion tank and an air-bleeder; everything is sized accordingly to the fancoils number, type
and overall capacity.
Water pressure in the circuit must be between 1 and 1.5 Bar (14.5 and 22 psig).
FRESH WATER PUMP (CIRCULATION PUMP)
The fresh water pump must be installed near the Climma DC chiller. The pump has to be installed on the
return line of the fresh water circuit, pumping water directly in the chiller and then to the fancoils.
FLOW SWITCH
Flow meter has to be installed on the fresh water circuit and it has to be accessible for maintenance.
The flow meter switch is mandatory safety equipment that will stop the system whenever the fresh water
flow stops or if it is not enough.
The flow meter switch has to be connected to the main electrical box of the unit as specified in the
electrical schematic.
Make sure that the flow meter is correctly connected to the control box. To test it, simulate a low flow
situation pressing the lever inside the cover of the switch.
MANIFOLDS

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Manifolds should be installed to be accessible for maintenance. If calibrating valves are installed, they
have to be completely opened.
HOSES
The water circuit must be as simple and straight as possible, avoiding bends, loops.
EXPANSION TANK
The expansion tank allows the water in the system to expand as it gets hot when the chiller is in heat
mode and it also acts as a cushion. The expansion tank has to be installed in the fresh water pump inlet.
AIR-BLEEDER
The automatic air bleeder must be installed on the pump outlet. This will prevent that any air in the
circuit reaches the fan coils and all the legs of the circuit.
ANTIFREEZE SOLUTION
The fresh water circuit needs to be filled with water (80%) and antifreeze (20%). Antifreeze will prevent
water and pipes from freezing. Antifreeze also reduces the corrosion inside the fresh water circuit.
Always check that the pressure gauge shows 1.5 Bar in the fresh water circuit.
We suggest two methods for filling the fresh water circuit with antifreeze:
 Calculate approximately the circuit capacity; Fill the circuit with water and add to it 20% of
antifreeze, using the second charging valve by gravity or using a pressure pump. Then connect
the circuit to the sanitary water circuit of the vessel, pressurize up to 1.5 Bar and start purging the
air. It is obvious that if purging will be difficult the percentage of antifreeze will decrease, as more
water will be needed to fill the circuit, therefore more antifreeze must be added to the circuit.
 Empty the circuit from the water used for leak test. Prepare an antifreeze solution of the quantity
needed to fill the circuit, made with 20% of antifreeze liquid; fill the circuit using a pressure pump.
Then proceed with purging air and topping up the pressure using the solution.
2.9. Electrical connections
The unit must be installed on a dedicated circuit with a rated thermal-magnetic circuit breaker. The
circuit breaker and electric cables (power supply) must be rated for the unit and comply with all local and
national codes.
The manufacturer will not be held responsible for damage or injuries due to improper installation.
Incorrect installation will void the Manufacturer’s warranty.
The electrical control box is already connected by Veco; to install the electrical box:
 Connect the power supply to the electrical box
 Connect the sea water pump to the electrical box
 Connect the circulation (fresh) water pump to the electrical box
Please refer to instruction C896 or to the Electrical schematic in this manual.
2.10. Installation checks
The following checks MUST be made during the initial field start-up:
 Check all wire connections.
 Check electrical input.
 Check the standard pressure in the refrigerant system.
 Check the expansion valve during operation.
Note: If the unit and/or remote condensing unit were not transported in an upright position, or has been
overturned during the installation process, allow them to stand, in an upright position, at least 4 hours
before starting the unit.

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3. Operating instructions
The unit can be controlled by the main electrical control box or remotely via Modbus protocol. In this
chapter only the main electrical box control is shown.
3.1. The electrical control box
The electrical control box of the chiller Climma DC is shown below.
The standard Climma DC configuration has the control box with a digital display to control the unit and a
local switch. The digital display can also be remote.
The electrical box has to be connected during the installation to the main power supply, to the sea water
pump and to the circulation pump.
The electrical box is already connected to: the inverter, the RC valve and water valve on the chiller, to the
electronic expansion valve, to the flow meter and to all the pressure and temperature sensors required by
the unit.
3.2. The display
The display has 6 buttons:
 WARNING: this will allow to access in the Warning/Error screens
 PROGRAM: this button allows to enter in the programming mode
 ESC: this button allows to exit from the current screen and go back to the previous level
 ENTER: when the cursor is on a value, the button allows to confirm the value
 UP/DOWN: these buttons allows to move between values or screens
3.3. Modes of operation
The unit has 3 possible modes:

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 SUMMER: When the unit is in SUMMER mode, the system will run in cool mode as chiller, cooling
the water until a specified set-point temperature value is reached.
 WINTER: When the unit is in HEAT mode, the system will run as heat pump, heating the water
until a specified set-point temperature value is reached.
 OFF: when unit is in OFF mode, the compressor will not run but the unit will be powered up.
When the system is powered up it will recall the previous mode of operation.
When the system starts for the first time, it will start in OFF mode.
3.4. Climma functions
When the compressor is running, the system can run with two different functions:
 AUTO function: when system is in AUTO function, the Climma Control will automatically adjust the
system power: when more power is requested, the compressor will run up to its maximum speed,
but when less power is requested, compressor will slow down.
 ECO function: when system is in ECO function, the Climma Control will automatically adjust the
system power, but this time the maximum power is limited to a specific ECO value, which allows
you to set a maximum power consumption, lower than the maximum system power
consumption.
Example.
Chiller maximum power consumption: 4,2kW
Generator: 10kW
When you are running the generator you can set the AUTO function on. If the system will run at full
power, it will still work with no problems, even at maximum speed.
When you are docked, you cannot run the generation and you have only 4kW from the harbor, then you
can set the ECO function on. This will allow the system to run up to 50% of its overall power, this means
that the power consumption will be limited around 2kW, allowing the system to run anyway.
3.5. Starting the unit
To start the unit, turn on the main power supply from the dedicated circuit breaker.
The display will show the following screens.
When the display shows the following screen, it’s possible to change the language from Italian to English
or the other way around.
To change the language from the current one, press ENTER. To confirm the current language press ESC.
If nothing is pressed, the system will start with the current language settings.
After the language settings, the system will go to the main screen.

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The main screen will show the current state of the system (Status: Summer,Winter, OFF), the operation
mode (Function: Auto, Eco) and information about compressor start-up.
3.6. Shut off procedure
To stop the unit from running, first put the unit in OFF mode and then power off the system from the
circuit breaker.
3.7. Switching between modes
To change the unit state and function, you need to access the programming screen.
Press PROGRAM and the following screen will show (Prog01).
Press ENTER until the selector will be on the value you want to change (the value will blink), then use the
arrows UP/DOWN to modify the value.
To confirm the value press ENTER again.
To go back to the main screen, press ESC.
3.8. Programming
Following there is the list of parameters that you can change in programming mode.
To change a value, press ENTER until the selector is on the value you want to change (the value will blink),
then use the arrows UP/DOWN to modify the value.
To confirm the value press ENTER again.
To go back to the main screen, press ESC.
(to access the following parameters press PROGRAM and move between values with ENTER (Prog01))
STATUS: Summer, Winter, OFF (see the description in 3.2)
Function: Auto, Eco (see the description in 3.3)
Set.Summer: This value is the temperature set point for the unit when running in cool mode. The system
will work to bring the temperature of the return water from the fancoils to this value.
Set.Winter: This value is the temperature set point for the unit when running in heat mode. The system
will work to bring the temperature of the return water from the fancoils to this value.
Max.Vel.ECO: This value is the maximum power in percentage that the unit can reach when it is in ECO
mode. By default this value is set to 50%, but it can be changed from 30% up to 70%.
In the following table, maximum power consumption is shown for the most common ECO settings (DC50
model only).

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ECO % RPS Consumption (A) Consumption (kW)
30 % 36 rps 4.9 A 1.0 kW
50 % 60 rps 8.8 A 1.9 kW
70 % 84 rps 14.7 A 3.3 kW
(to access the following parameters press PROGRAM, then move to screen Prog02 with the DOWN arrow,
then move between values with ENTER)
Unit of measure: °C, °F
Language: English, Italian
Date: date settings.
Time: time settings.
3.9. Warnings and errors
The system logs all alarms, warnings and errors, keeping track of all the information when the issue
occurred.
When there is a warning/error, the main display will show a bell symbol; to see the warning/error details,
press the WARNING button to see it.
To access the warning/error log, press WARNING from the main screen. Then press ENTER to see the
warning/error history.
In order to navigate through the warning/errors, use DOWN and UP buttons.
To go back to the main screen press ESC.
Following the main warning/error screen.
Following an example of a warning/error log.
3.10. System information

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The Climma DC chiller has 4 NTC probes and 2 pressure transducer to control the unit and to ensure the
system reliability.
From the digital display, it is possible to navigate through all the system information and monitor the
status.
To see other available information, press the DOWN button from the main screen; this will allow you to
navigate into other screens. Following a list of all the available system information.
SC02 - Fresh water return temperature: Real time value of the water temperature coming from the
fancoils.
SC02 - Set point: This is the ideal temperature value set in the system for the fresh water temperature.
SC02 - Compressor speed: This the real time compressor speed (it varies from 20 up to 100Rps/Hz)
SC03 – Press.Dischg: Discharge pressure.
SC03 – Press.Suct.: Suction pressure.
SC03: EVD valve opening: Percentage of opening of the electronic expansion valve. Electronic expansion
valve opens and closes to keep the superheat under control.
SC04 – Envelope zone: System will show if the compressor is working in a safe zone (Inside envelope) or
not. If not, it will give you information about the reason.
SC05 – Discharge gas temperature
SC06 – This screen shows some values in a graphic format.
SC07 – Code: Software code.
SC07 – Version: Software version.
SC07 – Data: Software release date.
SC07 – Bios: Bios version and release date.
SC07 – Boot: boot version and release date.
SC08 – From this screen you can enter other control parameters by pressing ENTER.

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4. Maintenance and cleaning
Climma DC chillers require some basic maintenance that has to be done frequently and some extended
maintenance to be done at longer intervals.
4.1. Basic maintenance
Following tasks need to be performed frequently.
 Clean the seawater strainer to allow enough sea water to the condenser coil
 The circulation circuit (fresh water circuit) has to be filled with water and no air must be present
inside the circuit. Pressure has to be between 1.5 Bar and 2 Bar (21 psi to 28 psi).
 Fancoils return air filters have to be controlled, cleaned or changed regularly.
NOTE. It’s recommended that the system is regularly used. If the system is not used at least once a month,
then there can be problems with the pump seals or with the reverse cycle valve. Try to run the system at
least once a month, both in cool and in heat mode.
When the system is not run for a long period, it’s important to manually run the pumps, removing the
back cover and manually rotate the cooling fan inside the pump. This will extend the life of the rotating
seal which can remain stuck by salt and break at immediate start.
IMPORTANT: Be sure to correctly fix the back cover cap correctly before running the pump at the end of
the maintenance.
4.2. Extended maintenance
Following tasks need to be performed at a semi-annual.
 Flush and clean the condenser with a scale dissolving solution to prevent scale build-up in the
coils and obstructions. To do this, inlet and outlet connections have to be disconnected from the
system.
 Check the sea water pump (clean the pump according to the pump model instruction )
 Check every sensor of the system to be properly connected to the control box and to be properly
installed on the system.
4.3. Winterization
When the boat is subject to a very cold climate, then some anti-freeze solution has to be entered in the
fresh water circuit (circulation circuit).

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5. Warnings, alarms and troubleshooting
5.1. Warnings and alarms
Probes naming:
 S1 = B6 = Low pressure meter sensor (suction pressure)
 S2 = B3 = Low temperature sensor (suction temperature)
 S3 = B7 = High pressure meter sensor (discharge pressure)
 S4 = B4 = High temperature sensor (discharge temperature)
Code Display description Reset Delay Action notes
AL1 Clock Board Fault compressor 1 Auto 0 sec Warning There may be an issue with the battery
in the board, please check the battery
and if it's not working change it.
Check also connections.
AL2 Clock Board Fault compressor 2 Auto 0 sec Warning
AL3 Clock Board Fault compressor 3 Auto 0 sec Warning
AL4 Clock Board Fault compressor 4 Auto 0 sec Warning
AL5 Exended memory fault compressor 1 Auto 0 sec Warning
Contact the closest Climma service
center
AL6 Exended memory fault compressor 2 Auto 0 sec Warning
AL7 Exended memory fault compressor 3 Auto 0 sec Warning
AL8 Exended memory fault compressor 4 Auto 0 sec Warning
AL9 Max discharge pressure compressor 1 Manual 0 sec OFF compressor Discharge pressure reading is more
then the allowed value therefore the
systems shuts off to keep the
compressor safe. Check the pressure
values registered in the log at the time
of the error.
Check the sea water pump and flow, as
there may be not enough flow thorugh
the sea water condenser.
AL10 Max discharge pressure compressor 2 Manual 0 sec OFF compressor
AL11 Max discharge pressure compressor 3 Manual 0 sec OFF compressor
AL12 Max discharge pressure compressor 4 Manual 0 sec OFF compressor
AL13 Min suction pressure compressor 1 Auto 0 sec OFF compressor the suction pressure reading is below
the safety levels. Please check the value
of the pressures and try to reset
manually the alarm.
If it does not stop, contact the closest
Climma service center.
AL14 Min suction pressure compressor 2 Auto 0 sec OFF compressor
AL15 Min suction pressure compressor 3 Auto 0 sec OFF compressor
AL16 Min suction pressure compressor 4 Auto 0 sec OFF compressor
AL17 Probe S1,S2,S3,S4 Alarms compressor 1 Manual 60 sec OFF compressor There is a proble with one or more
probles. Please check the probes
connections. Try to reset manually the
alarm, then if it does not go away, shut
off the system, wait 1 minute, then try
to restart the system. If the error does
not go eway, contact the closest
Climma service center.
AL18 Probe S1,S2,S3,S4 Alarms compressor 2 Manual 60 sec OFF compressor
AL19 Probe S1,S2,S3,S4 Alarms compressor 3 Manual 60 sec OFF compressor
AL20 Probe S1,S2,S3,S4 Alarms compressor 4 Manual 60 sec OFF compressor
AL21 Low superheat EVD compressore 1 Auto 0 sec Warning Superheat value is below the threshold
allowed, check and monitor the system.
Try to reset manually the alarm, then if
it does not go away, shut off the
system, wait 1 minute, then try to
restart the system. If the error does not
go eway, contact the closest Climma
service center.
AL22 Low superheat EVD compressore 2 Auto 0 sec Warning
AL23 Low superheat EVD compressore 3 Auto 0 sec Warning
AL24 Low superheat EVD compressore 4 Auto 0 sec Warning
AL25
Low evaporation temperature EVD
compressor 1 (LOP) Auto 0 sec Warning
The evaporating temperature of the
system is low, maybe there is not
enough refrigerant or the probe is
faulty. Try to reset manually the alarm,
then if it does not go away, shut off the
system, wait 1 minute, then try to
AL26
Low evaporation temperature EVD
compressor 2 Auto 0 sec Warning
AL27
Low evaporation temperature EVD
compressor 3 Auto 0 sec Warning

Veco S Installation Manual –Page 16 / 20
AL28
Low evaporation temperature EVD
compressor 4 Auto 0 sec Warning
restart the system. If the error does not
go eway, contact the closest Climma
service center.
AL29
High evaporation tempearture EVD
compressor 1 (MOP) Auto 0 sec Warning
The evaporating temperature of the
system is too high, maybe the probe is
faulty. Try to reset manually the alarm,
then if it does not go away, shut off the
system, wait 1 minute, then try to
restart the system. If the error does not
go eway, contact the closest Climma
service center.
AL30
High evaporation tempearture EVD
compressor 2 Auto 0 sec Warning
AL31
High evaporation tempearture EVD
compressor 3 Auto 0 sec Warning
AL32
High evaporation tempearture EVD
compressor 4 Auto 0 sec Warning
AL33
Low suction temperatura EVD
compressor 1 Auto 0 sec Warning
The suction temperature value is too
low, maybe there is not enough
refrigerant in the system and there's a
leak, or maybe a probe is faulty. Try to
reset manually the alarm, then if it does
not go away, shut off the system, wait 1
minute, then try to restart the system.
If the error does not go eway, contact
the closest Climma service center.
AL34
Low suction temperatura EVD
compressor 2 Auto 0 sec Warning
AL35
Low suction temperatura EVD
compressor 3 Auto 0 sec Warning
AL36
Low suction temperatura EVD
compressor 4 Auto 0 sec Warning
AL37 Start failure compressor 1 Auto5, M 10 sec OFF compressor An error occured while starting
compressor. Check sea water flow in
case compressor's envelope reaches
zone 5 or zone 9. Then try to reset
manually the alarm, then if it does not
go away, shut off the system, wait 1
minute, then try to restart the system.
If the error does not go eway, contact
the closest Climma service center.
AL38 Start failure compressor 2 Auto5, M 11 sec OFF compressor
AL39 Start failure compressor 3 Auto5, M 12 sec OFF compressor
AL40 Start failure compressor 4 Auto5, M 13 sec OFF compressor
AL41 Envelope alarm compressor 1 Manual 60 sec OFF compressor The compressor was working outside of
its "safe" zone, therefore the system
stopped. Check sea water flow in case
compressor's envelope reaches zone 5
or zone 9. Then try to reset manually
the alarm, then if it does not go away,
shut off the system, wait 1 minute, then
try to restart the system. If the error
does not go eway, contact the closest
Climma service center.
AL42 Envelope alarm compressor 2 Manual 60 sec OFF compressor
AL43 Envelope alarm compressor 3 Manual 60 sec OFF compressor
AL44 Envelope alarm compressor 4 Manual 60 sec OFF compressor
AL45 Low pressure differential compressor 1 Manual 60 sec OFF compressor Delta Pressure < than minimum
required for lubrication --> The
difference between the suction and
discharge pressures is too low and it
can create problems to the compressor.
Try to reset manually the alarm, then if
it does not go away, shut off the
system, wait 1 minute, then try to
restart the system. If the error does not
go eway, contact the closest Climma
service center.
AL46 Low pressure differential compressor 2 Manual 60 sec OFF compressor
AL47 Low pressure differential compressor 3 Manual 60 sec OFF compressor
AL48 Low pressure differential compressor 4 Manual 60 sec OFF compressor
AL49
High discharge gas temperature
compressor 1 Manual 0 sec OFF compressor
Discharge max. Temperature --> The
discharge temperature of the system is
too much and out of the allowed
values. Check that there is enough
water going through the condenser.
Try to reset manually the alarm, then if
it does not go away, shut off the
system, wait 1 minute, then try to
restart the system. If the error does not
go eway, contact the closest Climma
service center.
AL50
High discharge gas temperature
compressor 2 Manual 0 sec OFF compressor
AL51
High discharge gas temperature
compressor 3 Manual 0 sec OFF compressor
AL52
High discharge gas temperature
compressor 4 Manual 0 sec OFF compressor
AL53 Temperature sensor B1 error Auto 60 sec OFF compressor Temp. Probe B1 (set-point) faulty or

Veco S Installation Manual –Page 17 / 20
disconnected
AL54
Temperature sensor B2 error
compressor 1 Auto 60 sec OFF compressor
Temp. Probe B2 (antifreeze) faulty or
disconnected
AL55
Temperature sensor B2 error
compressor 2 Auto 60 sec OFF compressor
AL56
Temperature sensor B2 error
compressor 3 Auto 60 sec OFF compressor
AL57
Temperature sensor B2 error
compressor 4 Auto 60 sec OFF compressor
AL58
Temperature sensor B3 error
compressor 1 Auto 60 sec OFF compressor
Temp. Probe B3 (suction temperature)
faulty or disconnected
AL59
Temperature sensor B3 error
compressor 2 Auto 60 sec OFF compressor
AL60
Temperature sensor B3 error
compressor 3 Auto 60 sec OFF compressor
AL61
Temperature sensor B3 error
compressor 4 Auto 60 sec OFF compressor
AL62
Temperature sensor B4 error
compressor 1 Auto 60 sec OFF compressor
Temp. Probe B4 (discharge
temperature) faulty or disconnected
AL63
Temperature sensor B4 error
compressor 2 Auto 60 sec OFF compressor
AL64
Temperature sensor B4 error
compressor 3 Auto 60 sec OFF compressor
AL65
Temperature sensor B4 error
compressor 4 Auto 60 sec OFF compressor
AL66
Temperature sensor B5 error
compressor 1 Auto 60 sec OFF compressor NOT USED
AL67
Temperature sensor B6 error
compressor 1 Auto 60 sec OFF compressor
Pressure Probe B6 (suction pressure)
faulty or disconnected
AL68
Temperature sensor B6 error
compressor 2 Auto 60 sec OFF compressor
AL69
Temperature sensor B6 error
compressor 3 Auto 60 sec OFF compressor
AL70
Temperature sensor B6 error
compressor 4 Auto 60 sec OFF compressor
AL71
Temperature sensor B7 error
compressor 1 Auto 60 sec OFF compressor
Pressure Probe B7 (discharge pressure)
faulty or disconnected
AL72
Temperature sensor B7 error
compressor 2 Auto 60 sec OFF compressor
AL73
Temperature sensor B7 error
compressor 3 Auto 60 sec OFF compressor
AL74
Temperature sensor B7 error
compressor 4 Auto 60 sec OFF compressor
AL75 Defrost end by max time compressor 1 Auto Lock defrost
Defrost ended by max time duration -
NOT USED
AL76 Defrost end by max time compressor 2 Auto Lock defrost
AL77 Defrost end by max time compressor 3 Auto Lock defrost
AL78 Defrost end by max time compressor 4 Auto Lock defrost
AL79 BMS offline heartbit Auto
AL80 Auto
AL81
Compressor 1 not started by excessive
delta P Auto 300 sec OFF compressor
Start fail due to high DeltaP
AL82
Compressor 2 not started by excessive
delta P Auto 300 sec OFF compressor
AL83
Compressor 3 not started by excessive
delta P Auto 300 sec OFF compressor
AL84
Compressor 4 not started by excessive
delta P Auto 300 sec OFF compressor
AL85 Antifreeze alarm compressor 1 Manual 0 sec OFF compressor Anti freeze temp.probe out of allowed
range
AL86 Antifreeze alarm compressor 2 Manual 0 sec OFF compressor
AL87 Antifreeze alarm compressor 3 Manual 0 sec OFF compressor

Veco S Installation Manual –Page 18 / 20
AL88 Antifreeze alarm compressor 4 Manual 0 sec OFF compressor
AL89 Flowmeter compressor 1 Manual
S15sec,
0 OFF compressor
Flow switch error. Low water in the
circulation circuit
AL90 Flowmeter compressor 2 Manual
S15sec,
0 OFF compressor
AL91 Flowmeter compressor 3 Manual
S15sec,
0 OFF compressor
AL92 Flowmeter compressor 4 Manual
S15sec,
0 OFF compressor
AL93 Power+ offline compressor 1 Auto 30 sec OFF compressor Inverter is offline, shut off the power
supply and check the wiring diagram
and connections, then try to restart the
system and reset the alarm.
If the error does not go eway, contact
the closest Climma service center.
AL94 Power+ offline compressor 2 Auto 30 sec OFF compressor
AL95 Power+ offline compressor 3 Auto 30 sec OFF compressor
AL96 Power+ offline compressor 4 Auto 30 sec OFF compressor
AL97 Alarms Power+ compressor 1 Manual 0 sec OFF compressor
See below detailed alarms/errors
AL98 Alarms Power+ compressor 2 Manual 0 sec OFF compressor
AL99 Alarms Power+ compressor 3 Manual 0 sec OFF compressor
AL100 Alarms Power+ compressor 4 Manual 0 sec OFF compressor
AL101 Alarms board slave 1 offline Auto 60 sec OFF slave 1 comp.
Slave units offline
AL102 Alarms board slave 2 offline Auto 60 sec OFF slave 2 comp.
AL103 Alarms board slave 3 offline Auto 60 sec OFF slave 3 comp.
AL104 Alarms presence on unit slave 1
Slave units with alarms
AL105 Alarms presence on unit slave 2
AL106 Alarms presence on unit slave 3
EXV = Electronic Expansion Valve (errors related to this, AL07 to AL11, are due to other sensors that are required
from the valve to work correctly)
Inverter Alarm codes:
0: No fault
1: Overcurrent
The current delivered by the inverter drive is too high, check the power supply, then try to restart
the system and reset the alarm. If the error does not go eway, contact the closest Climma service
center.
2: Motor overload
The current delivered has exceeded the rated motor current beyond the maximum time
allowed.
Shut off the system, wait 1 minute, then try to restart the system and reset the alarm. If the
error does not go eway, contact the closest Climma service center.
3: Overvoltage
The DC voltage between the inverter and the compressor has exceeded the allowed limits.
There may be a voltage surges in the power supply, therefore check the power supply.
Shut off the system, wait 1 minute, then try to restart the system and reset the alarm. If the
error does not go eway, contact the closest Climma service center.
4: Undervoltage
The DC voltage between inverter and compressor is below the allowed limits. This can be due
to insufficient power supply or maybe other circuit errors, so check also for other errors, then
shut off the system, wait 1 minute, then try to restart the system and reset the alarm. If the
error does not go eway, contact the closest Climma service center.
5: Drive overT.
Drive temperature has exceeded the allowed maximum.
Inverter is water cooled so check that there is water flow in the cooling plate on the back of the
inverter.
If there is no flow, check the water valve on the system, which is allowing or not the water to
flow in the inverter cooling plate.
6: Drive underT Drive temperature is lower than the allowed minimum.
Heat the environment where the drive is installed.
7: Overcurrent HW
The current delivered by the inverter drive is too high; this can be due to a sudden significant
increase in
load or short-circuited motor cables.
Check the power supply and the cables to the motor, then shut off the system, wait 1 minute,
then try to restart the system and reset the alarm. If the error does not go eway, contact the
closest Climma service center.

Veco S Installation Manual –Page 19 / 20
8: Motor overtemp.
The temperature measured by the PTC thermistor on the motor exeed the allowed value.
Shut off the system, wait 1 minute, then try to restart the system. If the error does not go eway,
contact the closest Climma service center.
9: Drive Failure
10: Cpu error There has been a data loss in inverter memory, contact the closest Climma service center.
11: Param. default
12: DC bus ripple
Check the power supply as there are maybe fluctuations.
Shut off the system, wait 1 minute, then try to restart the system. If the error does not go eway,
contact the closest Climma service center.
13: Data comms fault
Data connection from the board to the inverter was interrupted. Try to reset manually the alarm,
then if it does not go away, shut off the system, wait 1 minute, then try to restart the system. If
the error does not go away, contact the closest Climma service center.
14: Drive thermistor There has been an internal fault of the inverter, please contact the closest Climma service center.
15: Autotune fault
16: Drive disabled
Cables are disconnected, an external protector maybe has been activated; check the
connections.
Try to reset manually the alarm, then if it does not go away, shut off the system, wait 1 minute,
then try to restart the system. If the error does not go away, contact the closest Climma service
center.
17: Motor phase
Motor cable disconnected, check the cables from the inverter drive to the compressor with
power supply off.
Try to reset manually the alarm, then if it does not go away, shut off the system, wait 1 minute,
then try to restart the system. If the error does not go away, contact the closest Climma service
center.
18: Fan fault
Fan failure, try to reset manually the alarm, then if it does not go away, shut off the system, wait
1 minute, then try to restart the system. If the error does not go eway, contact the closest
Climma service center.
19: Speed fault
Incorrect parameters or unsuitable motor load. Try to reset manually the alarm, then if it does
not go away, shut off the system, wait 1 minute, then try to restart the system. If the error does
not go eway, contact the closest Climma service center.
20: PFC Failure
PFC circuit overcurrent; there may be a problem in the power supply or maybe other circuit
errors, so check also for other errors, then shut off the system, wait 1 minute, then try to restart
the system and reset the alarm. If the error does not go eway, contact the closest Climma service
center.
21: Error code 21
AC input voltage too high, Check line voltage and the presence of inductive loads on the line that
may generate
overvoltage.
22: PFC Undervoltage AC input voltage too low, Check line voltage and the power cables.
23: STO Survey
internal fault. Try to reset manually the alarm, then if it does not go away, shut off the system,
wait 1 minute, then try to restart the system. If the error does not go eway, contact the closest
Climma service center.
24: STO Survey
25: Ground fault Drive earth leakage current is too high. Check motor earth insulation and the connection
cables.
26: Internal error 1
CPU overload. Try to reset manually the alarm, then if it does not go away, shut off the system,
wait 1 minute, then try to restart the system. If the error does not go eway, contact the closest
Climma service center.
27: Internal error 2
Data loss in memory. Try to reset manually the alarm, then if it does not go away, shut off the
system, wait 1 minute, then try to restart the system. If the error does not go eway, contact the
closest Climma service center.
28: Drive overload The current delivered has exceeded the drive’s rated current beyond the maximum time
allowed, check the load, motor sizing and the cables.
30: Error code 30
98 : Unexpected inverter restart
99: Unexpected inverter stop
There is a problem in the data connection between inverter and board. This may be due to a
problem in the power supply that allowed for a communication problem between inverter and
board. Try to reset manually the alarm, then if it does not go away, shut off the system, wait 1
minute, then try to restart the system. If the error does not go eway, contact the closest Climma
service center.

Veco S Installation Manual –Page 20 / 20
5.2. Basic troubleshooting
PROBLEM: SYSTEM IS NOT STARTING
 With power off, check that the power supply is correctly connected to the unit and that the circuit
breaker dedicated to the system is on.
 With power off, check the electrical connections to see if there is a bad connection at a terminal
block of the electrical control box.
 With power off, check that the circuit breaker on the system is on (the circuit breaker is on-board,
between the electrical box and the EMC filter-inverter).
 With power off, check between ground and L and N to see if there is continuity, then continue to
all components to find the problem. Correct or replace the component if continuity is found.
 If the problem has always been there, check the circuit breaker, maybe it is not enough.
PROBLEM: A PUMP IS NOT STARTING
 Check the power supply to the pump (check the connection from the electrical control box to the
pump)
 NB. The pumps are working only when the compressor is running.
PROBLEM: SYSTEM NOT COOLING/HEATING
 If compressor is running, then the system might have lost some refrigerant. Call an authorized
Veco service center and check the system pressures (discharge and suction).
 If compressor is not running:
o check if “Status” is OFF, then switch it to “Winter” or to “Summer”. In OFF status the
compressor is not supposed to run.
o check if the unit has already reached the set-point (in Winter mode, the return water
temperature has to be higher or equal to the set-point, in Summer mode, the return
water temperature has to be lower or equal to the set-point)
PROBLEM: HIGH PRESSURE ERROR
 (in Summer mode) Check the sea water flow and clean the strainer or the condenser if necessary.
 (in Winter mode) Check the circulation circuit flow and check the circulation pump.
 Check if the sea water pump is running correctly.