CWS MODUL

CWS MODUL

Installation, operation and maintenance manual

VECO S.p.A.
via Cantore 6, 20833 Giussano - (MI)ITALY
ViaCantore,6/8-20034Giussano Italy
Tel. +39 0362 35321 | Fax. +39 0362 852995
E-mail: info@veco.net | Web: www.veco.net

April 2019 Page 1 of 22 www.climma.it

 CWS MODUL

Table of contents
Chapter Contents page
1 Important warnings 3
2 Introduction 4
3 Installation 6
3-1 Sea water circuit 6
3-2 Fresh water circuit 8
3-3 Electrical circuit 10
4 Operation 12
5 Maintenance 16
6 Troubleshooting 17
7 Electrical schematic 22

VECO S.p.A.
via Cantore 6, 20833 Giussano - (MI)ITALY
ViaCantore,6/8-20034Giussano Italy
Tel. +39 0362 35321 | Fax. +39 0362 852995
E-mail: info@veco.net | Web: www.veco.net

April 2019 Page 2 of 22 www.climma.it

 1 – IMPORTANT WARNINGS
1.1.1 – PHASE SEQUENCE
The main electrical box is correctly phased to respect the phase sequence. This means that once
the supply voltage is applied correctly, respecting the phase sequence, all the devices connected
will respect the phase sequence at the terminal block. The pumps must also be wired correctly as
well the modules. In this way all the devices will be phased.
If the phase sequence is not respected the scroll compressor will not run correctly, will be noisier
and inefficient and can be damaged if left running in the wromng senso for more than 5 minutes.
The pumps (fresh water and sea water will not produce any circulation if running reverse. You can
check the rotation sense of the pumps from the back part where there is a metal grill and inside
there is the cooling propeller.
If the modules are equipped with inverter, the compressor is always running correctly as the
connection is made in the factory.
When the modules are not equipped with inverter the main electrical box has a phase sequence
relay which prevent the functioning in case of reverse sequence.

1.1.2 – CORROSION

In order to prevent any problem of galvanic corrosion (electrolysys) the central unit is equipped
with a ground connection for every seawater condenser. It is compulsary that every condenser is
linked in the correct way to the sea water pump and sea water intake, in order to keep these
points equipotential.
Failing to follow this rule voids any warranty on the product and puts in great danger the integrity
and the life of the system and of all components in contact with the sea water.

1.1.3 – SEA WATER VELOCITY

The sea water condensers of our units are made in Cu.Ni special material perfectly resistent to the
marine environment. Nevertheless we specify a value for the maximum flow thru the condenser in
order not to enter in the danger of damaging the condenser due to high speed.
The measure must be made with the modules running and measuring the temperature difference
between the IN and OUT of each condenser.
The temperature difference SHOULD NOT BE LESS THAN 6 °C which guarantees that the water
flow doesn't exceed the safe speed value.
Ignoring or infringing this specification voids the warranty of the sea water condensers.

1.1.4 – SAFETY 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.

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 2 - INTRODUCTION
2.1.1 – GENERAL INFORMATIONS
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 customerservice@veco.net.
WARNING
This unit should only be used for the purposes for which it was designed. The manufacturer
declines all responsibilities 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;
2.1.2 – SYSTEM FEATURES

Following the main features of the Climma CWS chillers:

A Climma centralized air-conditioning system includes different products: the Climma chiller,
fancoils installed in each cabin, 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 CWS 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 CWS chiller is heating the fancoil water
circuit that brings heated water to the fancoils, allowing them to blow heated air in the cabins.
Special features of Climma CWS chillers:
Modular design with individual compressor modules connected in parallell to obtain the specified
capacity.
Water Cooled Inverter Compressor. Climma’s water cooled inverter permits a 30% of capacity
reduction and zeroes the start amperage. In addition has a complete control on the compressor
running, monitoring all the safety devices. Water cooling allows it to be installed in the engine
room without additional ventilation. The inverter gives the possibility to run the system in low
voltages situation adapting the compressor speed to the voltage available.
2.1.3 – INSTALLATION
The unit must be installed by an authorized Climma service center and in compliance with the
instructions given in this manual.
2.1.4 – 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.

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 2 - INTRODUCTION
2.1.5 – 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 rules.
2.1.6 – DIRECTIVES

Climma CWS 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

2.1.7 – GENERAL SAFETY

Injuries or accidents caused by failure to comply with the recommendations of this manual are
solely to 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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 3 - INSTALLATION
3.1 - SEA WATER CIRCUIT
3.1.1 – SEA WATER PUMP
● The seawater pump is needed to circulate the given water quantity thru the refrigerant-sea water exchanger. The
seawater pump should also be quiet, continuous duty rated, marine grade material construction.
3.1.2 – POSITIONING
Choose the pump position as per the following rules:
A) The pump should be installed with the shaft in horizontal position
and the water outlet at top 0,5 m
B) The centrifugal pump must be installed at least 0.50 m below the
water line

FWD

A- B

C) The water intake must be "scoop type" oriented forward.

D) Seacock, strainer and pump intake should be connected without
STERN C siphoning; the piping should always rise from seacock to the pump

E) The intake line should be as short as possible (it is very

difficult to run a good circuit with an intake piping longer than
1 m).
F) The delivery side of the circuit should have the same
characteristics as intake so that the circuit will be self-
bleeding.
E G) The outlet line of the pump should rise at least for 25 cm. (10
in.) just after the pump outlet in order to keep the pump
primed at all times.

3.1.3 – INSTALLATION
The pump should be fastened with adequate screws using the holes in its base or the special fixing base (available
for small models). For larger pumps, the original quiet and smooth running can be improved by using a silent block
mounting.

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 3 - INSTALLATION
3.1.4 – CALIBRATION VALVE

The sea water condensers of our units are made in Cu.Ni special
material perfectly resistent to the marine environment. Nevertheless
we specify a value for the maximum flow thru the condenser in order
not to enter in the danger of damaging the condenser due to high
speed.
The measure must be made with the modules running and measuring
the temperature difference between the IN and OUT of each
condenser.
The temperature difference SHOULD NOT BE LESS THAN 6 °C
which guarantees that the water flow doesn't exceed the safe speed
value.
For this scope it is compulsary to install a calibrating valve on the
pump outlet. The calibrating valve will then be set to supply the correct Calibrating valve
cooling flow to the condenser(s).

3.1.5 – SEA WATER CIRCUIT

See also point 3.1.3. The sea water circuit must always rise from the sea water intake to the heat exchanger. It is
important to avoid ups and downs which will create syphons and prevent the circuit to run properly.
IMPORTANT
The sea water outlet must be installed close to the sea level considering the the water out should not make noise for
the boat itself and for the neighbours.

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 3 - INSTALLATION
3.2 – FAN COIL FRESH WATER CIRCUIT
3.2.1 – FRESH WATER CIRCUIT CONNECTIONS
Follow the installation diagrams. It's important to follow the instruction about the orientation and position of all the
system components.
To allow an easy maintenance, make sure all the components are accessible. For all the components strictly follow the
indication about the water flow direction. Fresh water circuit has to be the shortest and the simplest possible; each
single “top” point in the circuit should have a bleeding valve. Leave access to the air bleeding device on the fresh water
circuit.
For the lines respect the nominal diameter of the manifolds and leave it accessible, with the air bleeding valve on the
top.
Follow the schematics for the expansion tank. The connection port has to be on the top to allow air bleeding.
Follow the schematics for the fresh water pump.
The automatic air bleeder must be installed on the pump outlet. This will prevent that any air in the circuit keeps
circulating after the initial air bleeding.
For each fancoil, follow the water flow direction as marked on each unit. Each fan coil has an air bleeding valve that
must remain accessible for maintenance.
3.2.2 – FLOW SWITCH

The flow switch is an additional safety equipment that will stop the
system whenever the fresh water flow stops or if it is not enough.
The flow switch has to be installed on the fresh water circuit. It has
to be accessible for maintenance and for calibration.
The flow switch has to be electrically connected (two wires) to the
main electrical box of the unit as specified in the electrical
schematic ( terminals 1-3 opens on low flow).

3.2.3 – FRESH WATER CIRCUIT STRAINER

It is extremely important that the fresh water circuit contains
clean water with antifreeze liquid as specified. Any kind of
particles or dirty water is a danger for the circuit components.
For this reason it is compulsary to install a good quality
strainer in the fresh water circuit just before the inlet to the
modules. The strainer must be of sufficient size not to reduce
the water flow and must be installed between valves.
The strainer must be not less than 20mesh or 0,5 mm
passage.

3.2.4 – AUTOMATIC AIR BLEEDER

This device makes much simpler both the bleeding of the new system and the following
routine maintenance. It must be installed vertically on the outlet of the fresh water pump.
Thie automatic air-bleeder, once the fresh water pump is primed, bleeds any air which has
been trapped inside the circuit automatically. It will be necessary only to bleed the fan coils
installed in the highest position as all the remaining air will be bled automatically by this
device.

3.2.5 – PRESSURE TEST OF THE FRESH WATER CIRCUIT

The fresh water circuit has 2 service ports. Each port has a manual valve with check valve to prevent the water in the
circuit to go back to the sanitary water circuit.
Use one of the 2 valves and the pressure gauge in order to pressurize the circuit with fresh water at 1,5 Bar; this valve
must be connected to the water sanitary circuit in the boat.
Check that the fresh water circuit keeps the pressure over the time, which means that it has no leaks. See also 3,2,6
for the antifreeze mixture.

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April 2019
 3 - INSTALLATION
3.2.6 – ANTIFREEZE LIQUID
The fresh water circuit needs to be filled with water (80%) and antifreeze (20%). Antifreeze will prevent water from
freezing in case there is an anomaly in the circulation of the fresh water loop. 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:

1.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.
2.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.

3.2.7 – AIR BLEEDING

We strongly recommend that a special “Automatic Air bleeding vessel” be installed in the fresh water circuit, just
after the pump outlet. This device will dramatically reduce the bleeding procedure and will also keep the system free
of air during its life. The “air-bleeding vessel” is available in several sizes. See 3.2.4.
When the circuit is under pressure with the antifreeze solution, purge the air as follows:
Bleed the entire circuit (manifold, fan coils, and all the other purging points) starting from the lowest level and
keeping the circuit pressure at 1.5 Bars.
This bleeding must be done without running the pump.
Repeat all points, until no more air comes out from the bleeding valves, still keeping the pressure at 1.5 Bars.
Then...
Set to “off “ position each compressor switch.
Check that seawater intake is open and start the unit in “Cool “ mode; both pumps will run (see also 5.4).
Let the fresh water pump run for 30 seconds then stop the system and bleed again all points, keeping the pressure
at 1.5 Bars.
During this filling procedure it is normal that the red alarm light (flow switch alarm) sometimes comes on, indicating
that there is no flow in the circuit.
Bleeding can be considered over when no more air is coming off the purging points and the fresh water circulation
pump runs even and quiet.

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 3 - INSTALLATION
3.3 – ELECTRICAL CIRCUIT
3.3.1 – GENERAL
Electrics are composed by:
a) Main electrical box

b) Individual connection box (1 per each module) already

connected to the module controls and safeties

c) Fresh water temperature probe (installed in the return

fresh water manifold)

d) Flow switch supplied separate and installed at the end

of the fresh water manifolds (see 3.2.2) Main electrical box

Fresh water
temperature probe

Individual connection boxes

3.3.2 – ELECTRICAL CONNECTIONS

The unit must be installed on a dedicated circuit with a rated magnetothermal circuit breaker. The circuit breaker and
electric cable (power supply) must be rated for the unit and comply with all local and national rules.
Connect the main control box to each module, as shown in the electrical schematic, using an adequate cable,
respecting the marking in the main electrical box and in the module box. The numbering must follow the electrical
schematic supplied.
The flow switch (no polarity) must also be connected to the terminal board of the main electrical box as indicated in the
electrical schematic.
Never run the system without connecting the safety flow switch (see 3.2.2 ).

EXAMPLE OF CONNECTION SCHEMATIC FOR A SYSTEM WITH 3 MODULES WITH INVERTER

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 3 - INSTALLATION
3.3.2 – ELECTRICAL CONNECTIONS

EXAMPLE OF CONNECTION SCHEMATIC FOR A SYSTEM WITH 3 MODULES WITHOUT INVERTER

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 4 - OPERATION

4.1.1 MAIN ELECTRICAL BOX

The main electrical box has to be installed vertically
preferable in the same space of the chiller in a location free
from water, water spray and moisture and it has to
be accessible for operation and maintenance.
It has a “mains power switch” which powers the system,
compressors and pumps. It is also useful when a general
reset is required. The switch has also a safety function to
STEP REGULATOR
lock the door when it is in ON position.

There is a “INT / EXT” switch which permits to toggle from

the local Step regulator screen to a remote COOL/
OFF/HEAT selector to be connected to the terminal board.
LOCAL REMOTE
CONTROL
The green light confirms the internal 24V supply to the step
regulator while the red alarm light is controlled by the step
regulator and will come on when the system needs attention
.
As option for the sea water pump and also for the fresh water
pump there is a selector from duty/spare pump. OPTIONAL
DUTY/SPARE
MAINS POWER PUMP
SWITCH SELECTOR

4.1.2 DANFOSS STEP REGULATOR

X = back
The system is controlled by the
Danfoss step regulator.
At power up it will prompt the main Arrow-up = scroll up
screen like this.
The highlighted row is the actual
Arrow-down = scroll down
choice as you press enter. Scroll
the highlighted row using the
arrows to reach the other actions Enter = confirm

4.1.3 SYSTEM MODE CHOICE

Press enter
to modify Press arrows to change the value and then press enter to confirm

4.1.4 SETPOINT CHANGE

Press enter to
modify

Press arrows to
change the value and
then press enter to
confirm

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 4 - OPERATION
4.1.3 SYSTEM RUN

Move the highlighted

bar to “SWITCH ON
and press “ENTER”

The display will show you that the 2 pumps (SWP : ON – FWP : ON) are
running and in a short time 10-30 seconds) the compressor(s) will start in
sequence. The highlighted row is automatiucally positioned on the “SHUT
DOWN” action.

4.1.4 FRESH WATER FLOW CHECK

Move the highlighted

bar to “WATER
FLOW” and press
“ENTER”. The display
will show you the flow
values of each module

4.1.5 MODULE DATA

Move the highlighted bar

to “COMP” and press
“ENTER”. The display
will show you the
temperatures values of
each module. You can
reach all the modules by
scrolling with arrows

4.1.6 FAN COIL

Each cabin's temperature is monitored by a thermostat

that controls the fan's speed. The thermostat is
connected to the display in each single room. Display
can be mechanical (Fig.1) or digital (Fig.2).
Please refer to the mechanical panel or to the digital
display instruction for detailed information.

Digital display Vega MKII.

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 4 - OPERATION
4.1.7 SYSTEM STOP

Move the highlighted

bar to “SHUTDOWN”
and press “ENTER”

The display will then prompt the shutting down procedure. It

will automatically shut down the compressors in a short
sequence. Unless it is needed, do not force the quick
shutdown.

4.1.8 USER MENU

Press the “ENTER” key

Move the to confirm the choice, the
highlighted bar ARROW-UP and
to “MENU” and ARROW-DOWN to scroll
press “ENTER” and the X key to go back
to the previous
page/menu

SEE NEXT PAGE

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 4 - OPERATION

4.1.8 USER MENU

Press the “ENTER” key to

modify the parameter, the
ARROW-UP and ARROW-
DOWN to choose a different
value and the “ENTER” key
to confirm the new
parameter. X key to go back
to the previous page/menu

In case of need you can change one or

more compressors state from “ENABLE”
to “DISABLE”. This can be a quick
solution in case of a power reduction.

As default, the sea water pump runs only

when one or more compressors are
running. The othger option is to have the
pump running all the time.

4.1.9 TEST UTILITIES

This utility can run the sea water and fresh water
pumps for test and during the
commissioning/maintenenace procedures

Scroll with arrows and

chose with enter key

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 5 - MAINTENANCE
5.1.1 IMPORTANT MONTHLY CHECKS
In order to prevent any problem it is VERY IMPORTANT to check every month:

a) that every condenser is properly linked in the correct way to the sea water pump and sea water
intake, in order to keep these points equipotential.

b) that the temperature difference between the IN and OUT of each condenser SHOULD NOT
BE LESS THAN 6 °C, the value which guarantees that the water flow doesn't exceed the safe
speed value.
5.1.2 ROUTINE CHECKS
Every time the unit is operated check that:
1 – The Step Regulator doesn't show any alarm warning.
2 - The fresh water pressure in the circuit is between 1 and 2 bars as indicated by the gauge on
the unit. If the pressure drops frequently the circuit must be repaired and the leak(s) fixed as
continuous topping up the pressure will dilute the antifreeze reducing the unit safety. The
antifreeze solution of the fresh water (Fan Coil) circuit must be checked at least every year.
The solution to refill the circuit must be composed 80% water and 20% glycol or a good antifreeze
product. Clean monthly the strainer of the circuit.
3 - Check frequently the efficiency of the seawater circuit, inspecting daily the seawater strainer.
4 - Clean or better replace the air filters on each fan coil. A dirty air filter is dramatically
reducing the fan coil efficiency as it reduces the airflow.
5 - At the beginning of the summer season, check that the condensate drain from each fan
coil is clean and discharges freely.
6 - If the system is not operated for a while (over a week), we suggest turning both pumps
manually for few turns before running the system.
5.1.3 HOUR COUNTER
The running time of the compressors and pumps is recorded by the step regulator. Go to the
MENU and choose the “Hour counter”.
The Step regulator records in its memory in hours. The hour is made also by short running times
unless the power is cut before reaching the complete hour running.

The hour counter records

the running times, rounded
off to the hour. The running
time of each component is
noted and recorded only if
the total reaches 60
minutes before a power-off

Scroll with arrows to following page

5.1.4 SEA WATER AND FRESH WATER PUMPS MAINTENANCE

Check at least weekly that ther are no leaks for the pump body and rotary seal. The rotary seals of
both sea water and fresh water pumps must be replaced avery 12 months. Failing to do this
maintenance could cause the pumps to be deteriorated and corroded, voiding any warranty.
It is a must that yearly the pump impellers are checked and replaced if they show any sign of
deterioration.

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 6 - TROUBLESHOOTING

The system has several safety protections. When a value goes beyond the prescribed limit the
Danfoss stops the module which is involved and prompts an Alarm or Master Alarm warning.

Press enter to open the detail of the alarm. There are two types of alarm:
AUTORESET
MASTER ALARM
The autoreset will make 3 consecutive auto resets once the alarm contact
closes. At the fourth attempt the module will be locked out until a manual rest is
made.

The MASTER ALARM needs instead a manual reset.

In one case of MASTER ALARM (DEW RISK) the system is shut down
automatically.

6.1.2 HP ALARM – CODE 6 AND 51 (AFTER 3 AUTORESETS)

In case of lack of sea water (COOL The HP safety is installed on each

MODE) the system is protected by a module of the system. This means that
high pressure switch. Its intervention the lack of sea water cooling will likely
will stop the module where the affect all the running modules.
pressure switch has opened its REMEDY: restore the sea water flow
contact. The Danfoss will show this veryfing the pump functioning, the sea
screen. water intake and strainer.

6.1.3 FLOW ALARM – CODE 7 AND 52 (AFTER 3 AUTORESETS)

In case of lack of fresh water The FLOW safety is installed on each module of the
water flow (COOL MODE) the system. This means that the lack of fresh water flow
system is protected by a flow- might affect all the modules.
meter device. Its intervention will REMEDY: restore the correct fresh water flow
stop the module where the flow is inspecting the circulation pump. Make sure that the
lower than the minimum value for fresh water circuit is in pressure (1,5 Bar). Clean the
that unit. The Danfoss will show strainer.
this screen. Do not insist in manual resetting aslow fresh water flow
is very dangerous.

6.1.4 ANTIFREEZE ALARM – CODE 16 AND 53 (AFTER 3 AUTORESETS)

In case of lack of fresh water water This alarm could also happen in particular
flow (COOL MODE) the system is circumstances like very cold sea water and also
also protected by a sensor which will if the set point has been set very low.
detect a risk of freezing of the In any case, make the necessary checks before
evaporator. Its intervention will stop doing the manual reset
the module where the temperature is REMEDY: check the values of the fresh water
lower than the minimum value. flow; check the COOL mode set point and rise it
The Danfoss will show this screen. to 10°C. Do not insist in manual restting as
freezing is very dangerous.

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 6 - TROUBLESHOOTING
6.1.5 CANBUS ALARM – CODE 22-29 ALARM

If the communication between the module and the

Danfoss MCX is interrupted or not working the module
will be disconnected and stops. The Danfoss tries to
re-connect it for 1 minute and then it will need a
manual reset in order to get it back, once the
communication is restored. The message with the
code # tells which module is not communicating.
REMEDY: check that the module is powered. Check
the Can bus connections

6.1.6 LP ALARM – CODE 50 MASTER ALARM - MANUAL RESET ONLY

If the module has a leak and looses its refrigerant there is a low pressure switch
which will stop the unit. This control is active also before starting the compressor,
so in case the unit is very low in refrigerant it will not start. This safety is ONE OFF,
so it needs a manual reset. We warn to be very careful before resetting this alarm
as the module could be in risk of being flooded if the leak is in its internal circuit.
REMEDY: the refrigerant pressure must be chacked by a specilized engineer. Do
not run the module until its pressure has been verified with gauges.

6.1.7 DEW RISK ALARM – CODE 44 MASTER ALARM MANUAL RESET ONLY
The inverter is water cooled and its The inverter power module temperature is
temperature is monitored. In case of controlled with a water valve. This valve
subcooling there is the risk of condensation could get jammed by debris and leak
which is very dangerous. This alarm stops causing subcooling of the inverter power
the entire system. Cut off the main power to module.
the system and then isolate the module REMEDY: If the dew alarm has stopped the
from its circuit breaker to prevent any short system, first of all cut the power to the
circuit. module and then check if the inverter heat
Do not reset until you have checked that exchanger is cold. If it is cold, it means that
the inverter back plate (heat exchanger) is the water valve is not tight. The valve body
warm or tepid which means that the alarm must be cleaned carefully.
is due to weird circumstances (very high Before powering up, wait until the inverters
engine room temperature) have been warmed up and there is no more
risk of condensation.

6.1.8 LOW VOLTAGE – INSUFFICIENT POWER SUPPLY

In this table are listed the minimum voltage values accepted in order to start the
compressor and also the minimum value to keep it running. If the voltage supply falls
below these values, the compressor will not start or will stop when it is already running,
showing the STDBY or DIS-NOPWR state.
Under a certain minimum the system will simply consider the compressor “disabled” .
REMEDY: check the voltage supply at the inverter terminals. On case of three phase
supply, check that all the phases are present. In this case we suggest to stop the chiller
and restart it only when the powerr supply is restored.

threephase singlephase state

Nominal voltage 400 230 208 230 208 ON

Min voltage to start >352 >202 >183 >191 >173 ON

Min voltage to run <340 <196 <177 <184 <166 DIS-NOPWR

disabled <280 <161 <146 <161 <146 DIS-UVOLT

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 6 - TROUBLESHOOTING

6.1.9 FRESH WATER PROBE FAULT – CODE 1 MASTER ALARM SYSTEM OFF

If the fresh water probe is not connected to main control board or

it is faulty (broken or shorted) the Danfoss will immediately show
this screen.
It will not start if it is not running and it will go OFF if the system is
running.
REMEDY: check the fresh water sensor; connect it if not yet done
or replace if it is faulty

6.1.10 SLAVE INVERTER ANTIFREEZE PROBE FAULT- CODE 2 MASTER ALARM - MANUAL RESET ONLY

Code 2 on inverter
module #1
REMEDY: Check
and/or replace the
probe NTC. It needs a
manual reset.
The module remains
OFF until you reset it
Press enter to open the detail manually
of the alarm.

6.1.11 SLAVE INVERTER SW-IN PROBE FAULT - CODE 46 MASTER ALARM - MANUAL RESET ONLY
The probe installed on Sea
water IN is monitored. In
case of failure it triggers its
specific alarm.
REMEDY: Check and/or
replace the probe which is
causing the alarm.
The module remains OFF
until you reset it manually.

6.1.12 SLAVE INVERTER SW-OUT- CODE 47 MASTER ALARM - MANUAL RESET ONLY
The probe installed on Sea
water OUT is monitored. In
case of failure it triggers its
specific alarm.
REMEDY: Check and/or
replace the probe which is
causing the alarm.
The module remains OFF
until you reset it manually.

6.1.13 SLAVE INVERTER TENVIR PROBE FAULT- CODE 48 MASTER ALARM - MANUAL RESET ONLY

The probe installed for the

ENVIR is monitored. In
case of failure it triggers its
specific alarm.
REMEDY: Check and/or
replace the probe which is
causing the alarm.
The module remains OFF
until you reset it manually.

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 6 - TROUBLESHOOTING
6.1.8 STEP REGULATOR ALARM LIST

Error Description – Description Individual Individual Auto Manual System general notes
code module ALM module Reset reset goes off alarm
STOP
1 Fresh water temp error – master unit N Y Y Y Only for master unit
Guasto sensore temperatura acqua dolce unità master
2 Antifreeze sensor error – Guasto sensore antigelo Y Y N Y Short or open circuit – Unit #

6 High pressure alarm –Allarme alta pressione Y Y Y

7 Low fresh water flow alarm – Allarme flussimetro Y Y Y

9 Compressor thermal cut-out – Allarme klixon compressore Y Y N Y Y

10 Fresh water pump thermal cut-out – Allarme klixon pompa acqua dolce N Y Y

11 Sea water pump thermal cut-out – Allarme klixon pompa mare N Y Y

12 Missing CAN with BOILER module – Allarme comunicazione boiler Y Y Y

16 Anti-freeze alarm – Allarme sensore antigelo Y Y Y

22 Missing CAN slave n.1 – Allarme comunicazione modulo#1 Y Y Y* N N N Y* = Autoreset if communication is lost while
running.
If there is no communication at start the system
23 Missing CAN slave n.2 – Allarme comunicazione modulo#2 Y Y Y* N N N
must be re-powered once the communication is
restored
24 Missing CAN slave n.3 – Allarme comunicazione modulo#3 Y Y Y* N N N

25 Missing CAN slave n.4 – Allarme comunicazione modulo#4 Y Y Y* N N N

26 Missing CAN slave n.5 – Allarme comunicazione modulo#5 Y Y Y* N N N

27 Missing CAN slave n.6 – Allarme comunicazione modulo#6 Y Y Y* N N N

28 Missing CAN slave n.7 – Allarme comunicazione modulo#7 Y Y Y* N N N

29 Missing CAN slave n.8 – Allarme comunicazione modulo#8 Y Y Y* N N N

30 General inverter alarm-check subcode – Allarme generico inverter- Y Y N Y see detail exadecimal sub-code
verificare sub-code
33 Boiler #1 thermal cut-out – Allarme klixon boiler #1 Y** Y N Y N N.C. when boiler is ON- If the contact remains
open it means that the boiler klixon is open.
Y** = it lights the boiler general alarm
34 Boiler #2 thermal cut-out – Allarme klixon boiler #2 Y** Y N Y N

35 Boiler #3 thermal cut-out – Allarme klixon boiler #3 Y** Y N Y N

36 Boiler #4 thermal cut-out – Allarme klixon boiler #4 Y** Y N Y N

37 Boiler #1 power relay error – Errore teleruttore boiler #1 Y** N Y Y N.O. When boiler is OFF. If the contact is closed
it means that the power relay is jammed closed.
Y** = it lights the boiler general alarm

38 Boiler #2 power relay error – Errore teleruttore boiler #2 Y** N Y Y

39 Boiler #3 power relay error – Errore teleruttore boiler #3 Y** N Y Y

40 Boiler #4 power relay error – Errore teleruttore boiler #4 Y** N Y Y

42 All boilers in alarm – Allarme di tutti i boiler Y N N Y Y*** Y*** general alarm and then system goes OFF
and ALM OFF
44 Dew risk on inverter – Rischio condensa per l'inverter Y Y Y Y system goes OFF and ALM ON

45 Flow switch alarm – Allarme Flussostato Y Y**** Y **** ALL MODULES

46 Sea water In temperature probe error – Guasto sensore temperatura acqua Y Y Y

mare IN
47 Sea water OUT temperature probe error – Guasto sensore temperatura Y Y Y
acqua mare OUT
48 Inverter box temperature probe error – Guasto sensore temperatura scatola Y Y Y
inverter
50 Low pressure alarm – Allarme bassa pressione Y Y N Y Y manual reset

51 Repeated high pressure alarm – 3° allarme alta pressione Y Y N Y Y manual reset

52 Repeated fresh water flow alarm – 3° allarme flussimetro Y Y N Y Y manual reset

53 Repeated anti-freeze alarm – 3° allarme antigelo Y Y N Y Y manual reset

55 Flow switch repeated alarm – Allarme ripetuto Flussostato Y Y N Y Y manual reset

THIS TABLE IS BASED ON DANFOSS SW v.429 AND INVERTER FIRMWARE v.4_01

April 2019 Page 20 of 22 www.climma.it

 6 - TROUBLESHOOTING
6.1.9 DRIVE ALARM – CODE 30

There is also a series of alarms monitored by the inverter. These alarms appear with the same
alarm code 30.
In order to have the correct information move the higlighted bar to the alarm message and press
enter.
The Danfoss will then show the details of that alarm

The details are given in the form of

an exadecimal sub-code which
refers to the inverter alarm table

Sub-code Description Detail

0 – 00000001h Over Voltage Supply voltage to high. Risk to damage the inverter. Voltage exceeding the inverter limit can damage
permanently the components. Cut the power off immediately and verify that the design voltage of the inverter
corresponds to the supply voltage.

1 – 00000002h Inverter over current The amperage draw of the compressor went beyond the maximum amperage accepted by the inverter. This
could be caused by a problem with the compressor. Check the inverter model first. Then check the compressor
windings.

2 – 00000004h Under Voltage >30 The voltage has been below the minimum value for a very long time. For 30 minutes the inverter remains in
min. stand-by and ready to run the compressor in case the voltage rises to the normal value.
Complete missing of power supply is interpreted by the inverter as a condition of compressor disabled without
further warnings. The compressor state becomes DIS-UV.

3 – 00000008h Inverter Overheating The inverter power module temperature exceeds 70°. This means that its water cooling is not working properly.
Check the water valve which supplies the cooling water to the inverter heat exchanger.

4 – 00000010h Motor thermal cut- This alarm is generated by the inverter if the compressor connection is found “OPEN”
out

5 – 00000020h Motor maximum Current overload of the compressor. The compressor has been drawing in excess of its set maximum value for
current overload more than the maximum set time (15 seconds).

6 – 00000040h Sea Water Delta The 2 temperature probes installed on IN and OUT of the sea water condenser are measuring a difference
Temperature excess exceeding 20°C. This is caused by lack of cooling water, even before that the HP alarm trips. Check the sea
water flow veryfing the sea water pump, intake and strainer.

7 – 00000080h Inverter overload Inverter thermal cut-out. This is due to overheating of the inverter power module. Check that the inverter
model corresponds to the compressor power draw.

8 – 00000100h Motor average The compressor has been drawing in excess of its maximum current for a time sufficient to saturate the
current overload maximum average power value I2xT. The inverter has a maximum nominal compressor current. When this
limit is exceeded, the inverter makes a calculation of the excess and the time. When the limit is reached the
inverter gives this alarm. There is also a maximum compressor current which will cause the alarm 00000020h.

9 – 00000200h Short on inverter In this case there is a real short circuit on the inverter output. This alarm is the attempt to protect the inverter
output from a damage. Several attempts to reset this alarm might cause the complete failure of the inverter power
module.

10 - 00000400h Temporary This is the case which happens if the mains supply is not sufficient to run the compressor(s). The inverter
undervoltage 3 starts the compressor because the voltage is correct but after the start, due to insufficient power, the voltage
times – DISUV drops below the minimum. After three times the inverter stops the compressor and waits a manual reset. Make
sure that the power supply is sufficient. If not you could disable temporary one or more compressors from the
Danfoss user menu.

April 2019 Page 21 of 22 www.climma.it

 7 – ELECTRICAL SCHEMATIC
7.1.1 – ELECTRICAL CONNECTIONS

Each system is designed to the customer specifications.

This means that the electrical schematic is tailor made to each system, developed from our
standard design.
The main electrical box is manufactured under the CE rules with all the necessary safeties.
In the chapter 3 – Installation there are samples of the general schematic.

The complete drawing of

the main electrical box and
module control boxes is
supplied with the system
and it is identified by a
drawing number. The
electrical schematic can be
also identified with the unit
serial number.

April 2019 Page 22 of 22 www.climma.it