MTA MCCY-CY013 301 Operating instructions

WATER CHILLERS
MCCY - CY 013÷301
38178800800
Original instructions in Italian language
OPERATING AND MAINTENANCE MANUAL

OPERATING AND MAINTENANCE MANUAL
Quick guide
MCCY - CY 013÷301
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ENGLISH
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
QUICK GUIDE
The machines are equipped with an electronic control panel, which can be programmed by means of some buttons. It controls
the operation of refrigerant circuits basing on the measured control parameters. Here below are indicated some basic
instructions to start the unit. For further information consult Electronic Board chapter.
0.1 Unit switching on and off
ATTENTION
Before switching on the unit be sure that all personnel have read and understood the Chapter 2 “Safety“ of this manual.
Press the button 'for 5 seconds to start up the machine.
The led of icon flashes for 5 seconds then it remains lit.
To switch on MCCY units use the dedicated digital input.
The upper zone of display shows:
• OnC during chiller operation
NOTE
MCCY units can be controlled by temperature probes (see paragraph 5.8.3 “Controlling the condensing unit from BEWOT
and BEWIT temperature probes” ).
0.2 How to put the unit in stand by
Stand-by modality is obtained every time the unit is switched off.
It is indicated by the symbol Plit.
Also in stand-by modality the controller can:
1. Display the measured values
2. Manage the alarms by displaying and signalling.
0.3 Display
The display is divided in 3 zones (for further information please consult 7.1 “User interface” ).
Upper-left zone: it displays the evaporator’s temperature.
Lower-left zone: It displays the condensation temperature / pressure or the hour.
Right zone: Signalling icons.
0.4 Information about the status of the unit
0.4.1 Display icons
ICON MEANING ICON MEANING
Celsius degrees (If displayed) Low pressure alarm
Fahrenheit degrees (If not displayed) $Antifreeze resistance
Bar/Psi DPump ON
Compressor 1 Flow meter alarm
Compressor 2 Time to defrost starting (hour)
PStand-by unit BFan ON
General alarm Indication for Function Menu entering
High pressure alarm

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0.4.2 Symbols and leds on the display
0.4.3 Access to “Pr1” parameters (User level)
To enter the menu of “Pr1” parameters which can be access by the user:
1. Press for some seconds -+ 'buttons (5and start flashing), in the upper part of the display appears “ALL”,
the first group of parameters.
2. Select the various groups using (and 'buttons.
3. After selecting a group, press -button: if the selected group is part of the selected menu or any parameter of this
group has been moved in this menu, in the lower part of the display it appears the “Label” and the code of the
group’s first parameter present in “Pr1”, its value appears in the upper part of the display.
It will not be possible to enter a parameter’s group which is not part of this menu.
4. It is possible to scroll or modify the parameters contained in the group.
0.4.4 How to modify a parameter’s value
1. Enter the programming procedure.
2. Select the desired parameter.
3. Press ,button to enable the value’s adjustment.
4. Modify the value by means of (and 'buttons.
5. Press ,to store the new value and to pass to the code of the following parameter.
6. To exit the procedure: Press ,+ (when a parameter is displayed, or wait (about 240 seconds) without pressing
any button.
NOTE
The new value is stored also when the programming procedure is terminated for “time out”, without pressing -button.
ATTENTION
It is possible to modify the value of parameters contained in CF group (Configuration parameters) only when unit is in
stand-by.
0.5 Installation of the MCCY motocondensing unit
To install the motocondensing units follow the instructions in paragraph 5.8 “Cooling circuit connections in MCCY
motocondensing units” and consult the enclosed diagram.
LED LED STATUS MEANING LED LED STATUS MEANING
4Steady Unit on in heat pump modality 5Steady Defrosting enabled
Steady Unit on in chiller modality 5Unlit Defrosting disabled or
terminated
5Flashing Programming phase (if flashes
together with led) Clock adjustment
5Flashing Time to defrost starting

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CONTENTS
QUICK GUIDE ......................................................................................................................................1
0.1 Unit switching on and off.................................................................................1
0.2 How to put the unit in stand by ........................................................................1
0.3 Display .............................................................................................................1
0.4 Information about the status of the unit ...........................................................1
0.4.1 Display icons .....................................................................................................1
0.4.2 Symbols and leds on the display .......................................................................2
0.4.3 Access to “Pr1” parameters (User level) .........................................................2
0.4.4 How to modify a parameter’s value ..................................................................2
0.5 Installation of the MCCY motocondensing unit ..............................................2
CONTENTS ...........................................................................................................................................3
Chapter 1
GENERAL INFORMATION....................................................................................................................6
1.1 Description ....................................................................................................... 6
1.2 How to interpret the code of the model............................................................7
Chapter 2
SAFETY ................................................................................................................................................8
2.1 General .............................................................................................................8
2.2 General precautions..........................................................................................8
2.2.1 Liquids of the user circuit .................................................................................8
2.2.2 Lifting and carriage precautions ......................................................................9
2.2.3 Installation precautions ..................................................................................10
2.2.4 Precautions during operation .........................................................................10
2.2.5 Maintenance and repair precautions ..............................................................11
2.3 Refrigerant gases ............................................................................................ 11
2.3.1 Refrigerant safety schedule .............................................................................12
Chapter 3
TECHNICAL DATA .............................................................................................................................14
3.1 Main technical data ........................................................................................14
3.2 Other data relative to the standard machines MCCY-CY.............................. 15
3.3 Performance ...................................................................................................16
3.4 Sound level measurements .............................................................................16
Chapter 4
DESCRIPTION ....................................................................................................................................17
4.1 General ...........................................................................................................17
4.2 Operating principle......................................................................................... 17
4.3 Materials.........................................................................................................17
4.3.1 Casing .............................................................................................................17
4.3.2 Materials in contact with the liquid of the user circuit ...................................17
4.4 Components.................................................................................................... 17
4.4.1 Compressors ...................................................................................................17
4.4.2 Condenser .......................................................................................................18
4.4.3 Evaporator (CY models only) .........................................................................18
4.4.4 Fan/s ...............................................................................................................18
4.4.5 Hydraulic group (only CY models) .................................................................19
4.4.6 Antifreeze resistance .......................................................................................19
4.5 Overall dimension .......................................................................................... 20
4.6 Minimum distances from walls in the installation ambient ...........................20
4.7 Water and refrigerant circuits.........................................................................20
4.7.1 Water circuit (only CY models) ......................................................................20
4.7.2 Refrigerant circuit (only CY models) ..............................................................20
4.7.3 Refrigerant circuit for motocondensing version .............................................20
4.8 Electrical circuit .............................................................................................21
Chapter 5
INSTALLATION ..................................................................................................................................22

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5.1 Inspection....................................................................................................... 22
5.2 Positioning ..................................................................................................... 22
5.3 Antifreeze protection ..................................................................................... 22
5.4 Hydraulic circuit (only CY units) .................................................................. 23
5.5 Expansion tank............................................................................................... 24
5.6 Electrical connections .................................................................................... 25
5.7 Phase Monitor ................................................................................................ 26
5.8 Cooling circuit connections in MCCY motocondensing units ...................... 26
5.8.1 Installation and routing of refrigerant lines for condensing units ................. 27
5.8.2 Controlling the condensing unit from a digital input (Factory settings) ....... 29
5.8.3 Controlling the condensing unit from BEWOT and BEWIT temperature probes 29
Chapter 6
START UP .......................................................................................................................................... 31
Chapter 7
ELECTRONIC BOARD........................................................................................................................ 32
7.1 User interface................................................................................................. 32
7.1.1 Display ............................................................................................................ 32
7.1.2 Display icons .................................................................................................. 32
7.2 Function of buttons ........................................................................................ 33
7.2.1 Function of combined buttons ........................................................................ 33
7.3 Symbols and leds on the display.................................................................... 33
7.4 Remote terminal............................................................................................. 33
7.4.1 Function of buttons ......................................................................................... 33
7.5 Displaying during an alarm............................................................................ 34
7.5.1 Alarm icons ..................................................................................................... 34
7.6 How to silence the buzzer.............................................................................. 34
7.7 First start up ................................................................................................... 34
7.8 Programming by keyboard............................................................................. 35
7.8.1 Access to “Pr1” parameters (User level) ...................................................... 35
7.8.2 How to modify a parameter’s value ............................................................... 35
7.9 Values displayed ............................................................................................ 36
7.10 Unit switching on / off ................................................................................... 36
7.11 How to put the unit in stand by...................................................................... 37
7.12 Function menu (“*” button) ....................................................................... 37
7.12.1 Access to Function menu ................................................................................ 37
7.12.2 Exit Function menu ........................................................................................ 37
7.12.3 How to display the alarms “ALrM” ............................................................... 37
7.12.4 How to display the alarm historic “ALoG” ................................................... 37
7.12.5 Displaying the operating hours of loads “C1Hr - C2Hr - PFHr” ................ 38
7.13 Other functions by keyboard.......................................................................... 38
7.13.1 How to display the Set Point .......................................................................... 38
7.13.2 How to modify the Set Point ........................................................................... 38
7.14 Self-adaptive function (except for motorcondensing units) .......................... 38
7.15 Operation of compressors (except for motorcondensing units)..................... 39
7.15.1 Compressors regulation graphic .................................................................... 39
7.16 Alarm codes and actions ................................................................................ 39
7.17 Outlet blocking .............................................................................................. 42
7.18 Parameters description ................................................................................... 43
7.18.1 Thermoregulation parameters ........................................................................ 43
7.18.2 Configuration parameters .............................................................................. 43
7.18.3 Dynamic set point parameters (NOT ENABLED FUNCTION) ..................... 45
7.18.4 Energy Saving parameters (NOT ENABLED FUNCTION) ........................... 45
7.18.5 Compressor parameters ................................................................................. 45
7.18.6 Ventilation parameters ................................................................................... 45
7.18.7 Antifreeze support boiler resistance parameters ............................................ 45
7.18.8 Defrosting parameters .................................................................................... 45
7.18.9 Alarm parameters ........................................................................................... 45
7.18.10 LASER operating parameters (NOT ENABLED FUNCTION) ...................... 46

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7.19 Parameter setting ............................................................................................ 46
7.19.1 Thermoregulation parameters ........................................................................46
7.19.2 Configuration parameters ...............................................................................46
7.19.3 Dynamic Set-Point Parameters (NOT ENABLED FUNCTION) ....................48
7.19.4 Energy Saving Parameters (NOT ENABLED FUNCTION) ...........................48
7.19.5 Compressor parameters ..................................................................................48
7.19.6 Fan parameters ...............................................................................................48
7.19.7 Antifreeze resistance/supply parameters ........................................................48
7.19.8 Defrosting parameters ....................................................................................48
7.19.9 Alarm parameters ...........................................................................................49
7.19.10 LASER parameters (NOT ENABLED FUNCTION) .......................................49
7.20 Compressors unloading function....................................................................49
7.21 Probe description............................................................................................ 49
7.22 Management of double pump, CY 081÷301 units only.................................49
Chapter 8
OTHER COMPONENTS SETTING........................................................................................................50
8.1 Refrigerant high and low pressure switches...................................................50
8.2 Speed regulator and fan pressure switch........................................................50
8.3 Water differential pressure switch (only CY units) .......................................51
Chapter 9
OPERATION AND MAINTENANCE......................................................................................................52
9.1 Operation........................................................................................................ 52
9.2 Maintenance ...................................................................................................52
9.2.1 Unit access ......................................................................................................52
9.2.2 Water circuit emptying ....................................................................................53
9.3 Maintenance schedule .................................................................................... 56
Chapter 10
TROUBLE SHOOTING.........................................................................................................................57
APPENDIX ..........................................................................................................................................61

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General Information
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CHAPTER 1
GENERAL INFORMATION
1.1 Description
The machines described in this manual are called “WATER CHILLERS” or simply “CHILLERS”.
This manual is written for those responsible for the installation, use and maintenance of the unit.
These chillers have been designed exclusively for civil applications to cool a liquid flow.
The components used are of high quality and all the projecting process, from the production to the unit checking, has been
manufactured in conformity with ISO 9001 and CEI EN 60335-1 norms.
In most applications, the liquid of the user circuit is water and the term “WATER” will be used even if the liquid of the user
circuit is different from water (e.g. a mixture of water and glycol).
Here below the term “PRESSURE” will be used to indicate the gauge pressure.
The following symbols are shown on the stickers on the unit as well as on the overall dimension drawing and refrigeration
circuits in this manual.
Their meaning is the following:
To describe the unit components it is necessary the MODEL and the CODE NUMBER.
Water inlet in the machine
Install an adequate water filter on
the inlet piping
Water outlet from the machine
Indications for lifting the unit Cooling air flow
Direction of the refrigerant gas flow
and water circuit
Direction of pump rotation (if
installed) and of fan rotation
Electric shock risk Air vent

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1.2 How to interpret the code of the model
ATTENTION
This manual provides the user, installer and maintenance technician with all the technical information required
for installation, operation and carrying out routine maintenance operations to ensure long life.
If spare parts are required, this must be original.
Requests for SPARE PARTS and for any INFORMATION concerning the unit must be sent to the distributor or to the nearest
service centre, providing the MODEL and MACHINE NUMBER shown on the machine data plate and on the last page of this
manual.
MCCY-CY013÷020
MODEL DESCRIPTION
MC CY x x x
Cooling capacity expressed in HP multiplied for 10
Cygnus model code
MC Cygnus model code. MC is written only in the motocondensing
units
MCCY-CY031÷301
MODEL DESCRIPTION
MC CY x x x
Cooling circuit N°
Cooling capacity expressed in HP
Cygnus model code
MC Cygnus model code. MC is written only in the motocondensing
units

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Safety
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CHAPTER 2
SAFETY
This machinery was designed to be safe in the use for which it was planned provided that it is installed, started up and
maintained in accordance with the instructions contained in this manual.
The manual must therefore be studied by all those who want to install, use or maintain the unit.
The machine contains electrical components which operate at the line voltage, and also moving parts as fans and/or pump.
It must therefore be isolated from the electricity supply network before being opened.
All maintenance operations which require access to the machinery must be carried out by expert or appropriately trained
persons who have a perfect knowledge of the necessary precautions.
Avoid the presence of children in the unit installation place.
2.1 General
When handling or maintaining the unit and all auxiliary equipment, the personnel must operate with care observing all
instructions concerning health and safety at installation site.
Most accidents which occur during the operation and maintenance of the machinery are a result of failure to observe basic
safety rules or precautions.
An accident can often be avoided by recognising a situation that is potentially hazardous.
The user should make sure that all personnel concerned with operation and maintenance of the unit and all auxiliary
equipment have read and understood all warnings, cautions, prohibitions and notes written in this manual as well as on the
unit.
Improper operation or maintenance of the unit and auxiliary equipment could be dangerous and result in an accident causing
injury or death.
Do not operate the unit and auxiliary equipment until the instructions in the Operating section of this manual are understood
by all personnel concerned.
Do not carry out any servicing, repair or maintenance work on the unit and auxiliary equipment until the instructions in the
relevant sections of this manual are clearly understood by all personnel concerned.
We cannot anticipate every possible circumstance which might represent a potential hazard.
The warnings in this manual are therefore not all-inclusive.
If the user employs an operating procedure, an item of equipment or a method of working which is not specifically
recommended, he must ensure that the unit and auxiliary equipment will not be damaged or made unsafe and that there is no
risk to persons or property.
Any improper use of the machine will relieve the manufacturer from any liability for possible personal injury or property
damage.
Arbitrary modifications made to the unit will automatically invalidate all forms of guarantee provided by the manufacturer.
ATTENTION
The hot / cold water produced by MTA units cannot be used directly for domestic hygiene or food
applications. In the case of such applications, the installer is responsible for fitting an intermediate
exchanger.
If the intermediate exchanger is not fitted, the installer should affix a notice stating “non-drinking water”.
2.2 General precautions
2.2.1 Liquids of the user circuit
The liquids of the user circuit must be compatible with the materials used.
These can be water or mixtures of water and glycol, for example.
The addition of anti-corrosive chemical additives and operating in a pH range between 7 and 8 is recommended.
Even in the case of glycol mixtures, the use of appropriate chemical additives (consult the glycol supplier) is very important
to protect the chiller materials from possible corrosion caused by the chemical degradation to which glycol is subject.
If the liquids of the user circuit contains dangerous substances (e.g. ethylene glycol) is very important to collect any liquid
which leaks because it could cause damages to the ambient.
Furthermore, when the chiller is no longer used, dangerous liquids must be disposed of by firms specialised and authorised
for treating them.

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2.2.2 Lifting and carriage precautions
Avoid injury by using a hoist to lift heavy loads.
Check all chains, hooks, shackles and slings are in good condition and are of the correct capacity.
They must be tested and approved according to local safety regulations.
Cables, chains or ropes must never be applied directly to lifting eyes.
Always use an appropriate shackle or hook properly positioned.
Arrange lifting cables so that there are no sharp bends.
Use a spreader bar to avoid side loads on hooks, eyes and shackles.
When a load is on a hoist stay clear of the danger area beneath and around it.
Keep lifting acceleration and speed within safe limits and never leave a load hanging on a hoist for longer than is necessary.
The manufacturer does not supply bars, belts and lifting hooks with the unit.
The handling of chillers equipped with pallet can be done using fork-lift trucks in accordance with the drawing on the side;
the lifting can be done from all sides of the unit.
MCCY-CY 013÷071
MCCY-CY 081÷171
MODEL L min D min
MCCY-CY 013÷020 500 580
MCCY-CY 031÷071 600 700
MODEL L min D min l min d min
MCCY-CY 081÷101 900 600 1400 600
MCCY-CY 131÷171 1200 700 1200 700

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MCCY-CY 211÷301
To calculate the handling efforts, please refer to the weights indicated in the following table:
2.2.3 Installation precautions
For the connection to the electrical net see Chapter 5 “Installation“.
2.2.4 Precautions during operation
Operation must be carried out by competent personnel under a qualified supervisor.
All the water piping must be painted or clearly marked in accordance with local safety regulations in the place of installation.
Never remove or tamper with the safety devices, guards or insulation materials fitted to the unit or auxiliary equipment.
All electrical connections must comply with local codes.
The unit and auxiliary equipment must be earthen and protected by fuses against short-circuits and overloading.
When mains power is switched on, lethal voltages are present in the electrical circuits and extreme caution must be exercised
whenever it is necessary to carry out any work on the electrical system.
Do not open any electrical panels or cabinets or touch any electrical components or associated equipment while voltage is
applied unless it is necessary for measurements, tests or adjustments.
Such work should be carried out only by a qualified electrician equipped with the proper tools and wearing appropriate body
protection against electrical hazards.
MODEL L min D min l min d min
MCCY-CY 211÷301 1200 800 2000 700
CYGNUS (CY)
model
Pointing weight of the units
with accumulation group [kg]
Motocondensed
CYGNUS
(MCCY) model
Pointing weight of the units
[kg]
CY 013 117 MCCY 013 91
CY 015 120 MCCY 015 93
CY 020 130 MCCY 020 102
CY 031 212 MCCY 031 142
CY 051 243 MCCY 051 168
CY 071 245 MCCY 071 170
CY 081 432 MCCY 081 314
CY 101 440 MCCY 101 323
CY 131 560 MCCY 131 433
CY 171 591 MCCY 171 463
CY 211 702 MCCY 211 565
CY 251 725 MCCY 251 586
CY 301 742 MCCY 301 601

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2.2.5 Maintenance and repair precautions
Maintenance, overhaul and repair work must be carried out by competent personnel under a qualified supervisor.
When disposing of parts and waste material of any kind make sure that there is no pollution of any drain or natural water-
course and that no burning of waste takes place which could cause pollution of the air.
Protect the environment by using only approved methods of disposal.
If replacement parts are needed use only original spares.
Keep a written record of all maintenance and repair work carried out on the unit and auxiliary equipment.
The frequency and the nature of the work required over a period can reveal adverse operating conditions which should be
corrected.
Use only refrigerant gas specified on the specification plate of the unit.
Make sure that all instructions concerning operation and maintenance are strictly followed and that the complete unit, with all
accessories and safety devices, is kept in good working order.
The accuracy of pressure and temperature gauges must be regularly checked.
They must be renewed when acceptable tolerances are exceeded.
Keep the machine clean at all times.
Protect components and exposed openings by covering them, for example, with clean cloth or tape during maintenance and
repair work.
Do not weld or carry out any operation which produces heat near a system which contains oil or flammable liquids.
The systems which may contain oil or flammable liquids must be completely drained and cleaned (with steam, for example),
before carrying out these operations.
Never weld, nor modify in any way, a vessel which may be put under pressure.
To prevent an increase in working temperature, inspect and clean heat exchanging surfaces (i.e. condenser fins) regularly.
For every unit establish a suitable time schedule for cleaning operations.
Avoid to damage the safety valves and other pressure relief devices.
Avoid plugging by paint, oil or dirt accumulation.
Precautions must be taken when carrying out welding or any repair operation which generates heat, flames or sparks.
The adjacent components must always be screened with non-flammable material and if the operation is to be carried out near
any part of the lubrication system, or close to a component which may contain oil, the system must first be thoroughly
purged, preferably by steam cleaning.
Never use a light source with an open flame to inspect any part of the machine.
Before dismantling any part of the unit ensure that all heavy movable parts are secured.
When a repair has been completed, make sure no tools, loose parts or rags are left in, or on the machine.
Check the direction of rotation of electric motors (the pump if installed) when starting up the unit initially and after any work
on the electrical connections or switch gear.
All guards must be reinstated after carrying out repair or maintenance work.
Do not use flammable liquid to clean any component during operation.
If chlorinated hydrocarbon non-flammable fluids are used for cleaning, safety precautions must be taken against any toxic
vapors which may be released.
ATTENTION
Before removing any panels or dismantling any part of the unit, carry out the following operations:
- Isolate the unit from the main electrical power supply by disconnecting the cable from the electrical power source.
- Lock the isolator in the “OFF” position with a lock.
- Attach a warning label to the main isolator switch conveying: “WORK IN PROGRESS - DON NOT APPLY VOLTAGE”.
- Do not switch on electrical power or attempt to start the unit if a warning label is attached.
Coloured tracers can be used in service-maintenance operations.
Inspect all refrigerant circuit joints including connectors, flanges, and more generally all critical points (open joints) in order
to prevent possible leakage of refrigerant gas.
2.3 Refrigerant gases
R410A is used as refrigerant in these units.
Never attempt to mix refrigerant gases.
To clean out a very heavily contaminated refrigerant system, e.g. after a refrigerant compressor burnout, a qualified
refrigeration engineer must be consulted to carry out the task.
The manufacturer's instructions and local safety regulations should always be observed when handling and storing high
pressure gas cylinders.

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2.3.1 Refrigerant safety schedule
Denomination: R410A (50% Difluoromethane (R32); 50% Pentafluoroethane (R125);
INDICATION OF THE DANGERS
Major dangers: Asphyxia.
Specific dangers: Rapid evaporation can cause freezing.
FIRST AID MEASURES
General information: Do not give anything to unconscious persons.
Inhalation: Take the person outdoors.
Use oxygen or artificial respiration if necessary.
Do not administer adrenaline or similar substances.
Contact with the eyes: Thoroughly wash with plenty of water for at least 15 minutes and call a doctor.
Contact with the skin: Wash immediately with plenty of water.
Remove contaminated clothing immediately.
FIRE-FIGHTING MEASURES
Means of extinction: Any means.
Specific dangers: Pressure increase.
Specific methods: Cool the containers with water sprays.
MEASURES IN THE EVENT OF ACCIDENTAL LEAKAGE
Individual precautions: Evacuate personnel to safe areas.
Provide adequate ventilation.
Use means of personal protection.
Environmental precautions: Evaporates.
Cleaning methods: Evaporates.
HANDLING AND STORAGE
Handling
technical measures/
precautions: Ensure sufficient air change and/or extraction in the work areas.
recommendations for safe
use:
Do not inhale vapors or aerosols.
Storage Close properly and store in a cool, dry well-ventilated place. Store in its original containers.
Incompatible products: explosives, flammable materials, organic peroxide.
CONTROL OF EXPOSURE/INDIVIDUAL PROTECTION
Control parameters: AEL (8-h e 12-h TWA) = 1000 ml/m3 for each of the two components.
Respiratory protection: For rescue and maintenance work in tanks, use autonomous breathing apparatus.
The vapors are heavier than air and can cause suffocation, reducing the oxygen available for
breathing.
Protection of the eyes: Safety goggles.
Protection of the hands: Rubber gloves.
Hygiene measures: Do not smoke.
PHYSICAL AND CHEMICAL PROPERTIES
Colour: Colourless.
Odour: Faint.
Boiling point: -52.8°C at atm. press.
Flammability point: Non flammable.
Relative density: 1.08 kg/l at 25°C.
Solubility in water: Negligible.
STABILITY AND REACTIVITY
Stability: No reactivity if used with the relative instructions.
Materials to avoid: Highly oxidizing materials. Incompatible with: magnesium, zinc, sodium, potassium and
aluminium.
Incompatibility increases if metal is in powder or surfaces have not been recently protected.
Hazardous decomposition
products:
These products are: halogen compounds, hydrofluoric acid, carbon oxide (CO, CO2), carbonyl
halides.

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Safety
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
TOXICOLOGICAL INFORMATION
Acute toxicity: (R32) LC50/inhalation/4 hours/lab. rats >760 ml/l
(R125) LC50/inhalation/4 hours/lab. rats >3480 mg/l
Local effects: Concentrations substantially above the TLV can cause narcotic effects.
Inhalation of products in decomposition can lead to respiratory difficulty (pulmonary oedema).
Long-term toxicity: Has not shown any cancerogenic, teratogenic or mutagenic effects in experiments on animals.
ECOLOGICAL INFORMATION
Global warming potential
HGWP (R11=1):
1730
Ozone depletion potential
ODP (R11=1):
0
Considerations on disposal: Usable with reconditioning.

OPERATING AND MAINTENANCE MANUAL
Technical data
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
CHAPTER 3
TECHNICAL DATA
3.1 Main technical data
The main technical data are given on the machine data plate:
For all MCCY-CY models
MODEL and CODE They identify the size of the unit and the type of construction.
MANUAL This is the code number of the manual.
SERIAL NUMBER This is the construction number of the unit.
MANUFACTURING YEAR This is the year of the final test of the unit.
VOLTAGE/PHASE/FREQUENCY Electric alimentation characteristics.
MAX. CONSUMPTION
(I max)
This is electrical current consumed by the unit during the limit working conditions
(refrigerant condensing temperature is 65°C = 149°F; refrigerant evaporating
temperature is 10°C = 50°F).
INSTALLED POWER
(P max)
It is the power absorbed by the unit during the limit working conditions (refrigerant
condensing temperature is 65°C = 149°F; refrigerant evaporating temperature is
10°C = 50°F).
PROTECTION As defined by the EN 60529 European standard.
REFRIGERANT This is the refrigerant fluid in the unit.
REFRIGERANT QUANTITY This is the quantity of refrigerant fluid contained in the unit.
For CY 013÷071 MCCY 013÷301 models
MAX. COOLING PRESSURE This is the design pressure of the refrigeration circuit.
MAX. COOLING
TEMPERATURE
This is the design temperature of the refrigeration circuit.
For CY 081÷301 models
MAX. COOLING PRESSURE HP
SIDE
This is the design pressure of the refrigeration circuit of the high pressure side
MAX. COOLING PRESSURE LP
SIDE
This is the design pressure of the refrigeration circuit of the low pressure side
For all MCCY-CY models
USER CIRCUIT FLUID Fluid used by the unit (normally water).
MAX. UTILIZATION PRESSURE Max. designed pressure of the utilization circuit.
MAX. TEMPERATURE Design temperature of the user circuit; this should not be confused with the
maximum working temperature which is established when the offer is made.
SOUND PRESSURE LEVEL Sound pressure level in a free field in hemispherical irradiation conditions (open
field) at a distance of 1 m from the machine, condenser side, and at 1.6 m from the
ground.
AMBIENT TEMPERATURE Min. and max. cooling air temperature value.
WEIGHT This is the approximate weight of the unit before packing.

OPERATING AND MAINTENANCE MANUAL
Technical data
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
3.2 Other data relative to the standard machines MCCY-
CY
Model 013 015 020 031 051
for CY units
Tank capacity water volume (litres) 25 25 25 70 70
PUMP P0
water flow rate
min/max (m3/h) 0.25/1.0 0.3/1.3 0.4/2 - -
available head (bar) 0.36 0.40 0.24 - -
absorbed power (kW) 0.2 0.2 0.2 - -
PUMP P1
water flow rate
min/max (m3/h) 0.25/1.0 0.3/1.3 0.4/2 0.55/2.65 0.8/3.75
available head (bar) 0.71 0.75 0.59 1.34 1.13
absorbed power (kW) 0.4 0.4 0.4 0.61 0.61
for MCCY-CY units
Axial fan
number of fans 11122
complete air flow (m3/h) 3850 3850 3500 7900 7300
Model 071 081 101 131 171
for CY units
Tank capacity water volume (litres) 70 150 150 150 150
PUMP P0
water flow rate
min/max (m3/h) - 1.25/6.2 1.6/8.3 2.1/10.8 2.5/12.6
available head (bar) - 0.89 0.33 0.73 0.48
absorbed power (kW) - 0.61 0.61 0.82 0.82
PUMP P1
water flow rate
min/max (m3/h) 1.0/4.38 1.25/6.2 1.6/8.3 2.1/10.8 2.5/12.6
available head (bar) 0.92 1.70 1.04 1.58 1.30
absorbed power (kW) 0.61 0.88 0.88 1.32 1.32
for MCCY-CY units
Axial fan
number of fans 22244
complete air flow (m3/h) 7000 11750 11500 18000 17600
Model 211 251 301
for CY units
Tank capacity water volume (litres) 150 150 150
PUMP P0
water flow rate
min/max (m3/h) 2.9/14.2 3.2/16.5 3.7/18.3
available head (bar) 0.90 0.75 0.53
absorbed power (kW) 1.12 1.12 1.12
PUMP P1
water flow rate
min/max (m3/h) 2.9/14.2 3.2/16.5 3.7/18.3
available head (bar) 1.73 1.59 1.40
absorbed power (kW) 1.84 1.84 1.84
for MCCY-CY units
Axial fan
number of fans 222
complete air flow (m3/h) 23400 22800 22800

OPERATING AND MAINTENANCE MANUAL
Technical data
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
NOTE
- The head is the head available to the user:
it refers to the following conditions: air ambient temperature of 35° C, inlet water temperature of 12°C and outlet water
temperature of 7° C.
- It is possible for the pump installed to be different from the standard. In this case reference should be made to the data in
the offer.
ATTENTION
The installation of an adequate water filter on the unit inlet is recommended.
3.3 Performance
The performance of the unit depends principally on the water flow rate of the user circuit, on its temperature and on the
ambient temperature.
These data are defined in the offer and it is to these that reference should be made.
3.4 Sound level measurements
* at distance of 1 metre (3,2 FT)
** global
Test conditions
Noise levels refer to operation of the unit at full load in nominal conditions.
Sound pressure level in hemispherical irradiation conditions at a distance of 1 m (3,2 FT) from the condenser side of the unit
and height of 1.6 m (5,2 FT) from the ground. Values tolerance ± 2 dB.
Sound power level: in compliance with ISO 3744.
Model Lp dB(A) * Lw dB(A) ** Model Lp dB(A) * Lw dB(A) **
MCCY-CY 013 50.6 63.6 MCCY-CY 101 59.5 72.5
MCCY-CY 015 52.7 65.7 MCCY-CY 131 61.8 74.8
MCCY-CY 020 53.9 66.9 MCCY-CY 171 63.2 76.2
MCCY-CY 031 55.7 68.7 MCCY-CY 211 63.6 76.6
MCCY-CY 051 56.9 69.9 MCCY-CY 251 64.4 77.4
MCCY-CY 071 57.9 70.9 MCCY-CY 301 64.0 77.0
MCCY-CY 081 56.5 69.5

OPERATING AND MAINTENANCE MANUAL
Description
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
CHAPTER 4
DESCRIPTION
ATTENTION
The following information refer only to the CY models, because the MCCY units are not equipped with evaporator, pump
and hydraulic group.
4.1 General
Cygnus range are monobloc units air condensed equipped with: hermetic compressors, hydraulic group made up of a plate-
type evaporator, an accumulation tank, a circulator or a pump (it depends on the model) and a condenser made up a fin
battery and axial fans.
Each chiller is equipped with a microprocessor control that manages the main functions of the unit such as the regulations,
the alarms and the user interface.
The units use R410A.
The components used for these machines are of high quality and all the projecting process, from the production to the unit
checking, has been manufactured in conformity with ISO 9001 norms.
4.2 Operating principle
All the units described in this manual work on the basis of the same principle.
A refrigerant circuit cools a water flow thanks to the use of a tube plate evaporator, where in one side the refrigerant fluid
evaporates and in the other side the liquid to be cooled flows.
The refrigerant compressor is managed by an electronic control that checks the water inlet temperature to the machine in
order to keep the outlet temperature inside the set limits.
4.3 Materials
The data relating to the materials refer to standard machines.
In case of particular units special materials are used, so it is necessary to refer to the data on the offer.
4.3.1 Casing
The whole base, risers, panels are in galvanised carbon steel sheet fixed together with screws.
All the sheets are phospho-degreasing treated and painted with polyester-powders.
The structure has been designed for the easy access to all the unit components.
In all units the compressor site is covered with sound-absorbent material to reduce the unit noise.
4.3.2 Materials in contact with the liquid of the user circuit
Plate evaporator in stainless steel, braze welded with copper, tank in carbon steel, copper tubes.
4.4 Components
The data relating to the components refer to standard machines.
In case of particular units special materials are used, so it is necessary to refer to the data on the offer.
4.4.1 Compressors
The MCCY-CY 013÷020 units are equipped with a Rotary compressor of hermetic type, while the MCCY-CY 031÷301 units
are equipped with a Scroll compressor of hermetic type. The MCCY-CY 171 models have one compressor, while the MCCY-
CY 211÷301 models have two tandem compressors.
These components are positioned in the compressor site, sound isolated with a sound-absorbent mattress of 15÷20 mm
thickness positioned on the side panels, compressor site - fan site separating panel and compressor site closing front panel.
MCCY-CY 013÷071 MCCY-CY 081÷171 MCCY-CY 211÷301

OPERATING AND MAINTENANCE MANUAL
Description
MCCY - CY 013÷301
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ATTENTION
The first time the machine is started after several days’ stoppage, turn on the casing resistance of every compressor at
least 6 hours before pressing the ON/OFF button.
4.4.2 Condenser
Consisting of a fin-pack battery with aluminium fins, copper tubes and shoulders in galvanised sheet.
The condenser batteries have been calculated, dimensioned and designed by means of modern computerised design technics.
A good subcooling completes the total efficiency increasing the unit final COP (Coefficient Of Performance = cooling
capacity/absorbed power).
4.4.3 Evaporator (CY models only)
Plate evaporator in stainless steel, braze welded with copper, tank in carbon steel, copper tubes. It is positioned inside the
compressor compartment in all models.
If requested, the evaporator can be furnished with an antifreeze resistance, to prevent risks of freezing, see paragraph 4.4.6
“Antifreeze resistance” .
NOTE
The motocondensing versions MCCY are not equipped with the evaporator and thermostatic valve. A remote evaporator and
a valve must be installed. This operation have to be carried out by qualified personnel. For further information see
paragraph 4.7.3 “Refrigerant circuit for motocondensing version” .
4.4.4 Fan/s
All units are equipped with axial fans.
The MCCY-CY 013÷071 and MCCY-CY 131÷171 units are equipped with fans which have vanes made up of plastic
material, while the MCCY-CY 081÷101 and MCCY-CY 211÷301 units are equipped with fan switch made up of aluminium
sickle profile shovels.
The MCCY-CY 013÷071 units are equipped with conveyors made up of radiused polystyrene, while the MCCY-CY 081÷301
units are furnished with a nozzle notched in the cover plate.
All units can be furnished with an electronic regulator for the fans, more over only the MCCY-CY 013÷020 models can be
furnished even with ON/OFF step regulation.
MCCY-CY 013÷020 MCCY-CY 031÷071 MCCY-CY 081÷301
CY 013÷020 CY 031÷071 CY 081÷301

OPERATING AND MAINTENANCE MANUAL
Description
MCCY - CY 013÷301
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The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
Up to the MCCY-CY 171 model the units are equipped with a single-phase fan, while MCCY-CY 201÷301 units are
equipped with three-phases fans.
The protection rating is IPX4 and it has F insulation class to assure the external working with all types of climates. The
assembly is completed with an external safety protection grill.
4.4.5 Hydraulic group (only CY models)
The CY may have different configurations:
CY 013÷071
• without hydraulic group
• with P0 pump (only CY 013÷020)
• with P1 pump
• with hydraulic group and P0 pump (only CY 013÷020)
• with hydraulic group and P1 pump
CY 081÷301
• without hydraulic group
• with P0 pump
• with P1 pump
• with double pump P0+P0
• with double pump P1+P1
• with hydraulic group and P0 pump
• with hydraulic group and double pump P0+P0
• with hydraulic group and P1 pump
• with hydraulic group and double pump P1+P1
These options can be choose during the offer.
NOTE
In units equipped with double pump, one pump is in stand-by.
The hydraulic group is composed by:
• tank of appropriate capacity;
• single pump or double pump;
• drainage/filling valve;
• manual bleed valve;
• expansion tank of an adequate volume;
• 3 barg safety valve;
• water pressure gauge positioned on the pump outlet, in order to check the preloaded pressure of the unit (when
the chiller is off) and the pump outlet pressure (when the chiller in on);
• differential pressure switch on the evaporator to inhibit compressor operation in the case of no water flow
through the hydraulic section (present even when the hydraulic unit is not present);
For the data concerning the pump and the tank see the paragraph 3.2 “Other data relative to the standard machines MCCY-
CY” .
NOTE
For correct operation of the unit install a filter to intercept debris in the water inlet pipe. Failure to observe this prescription
can result in irreparable damage to the evaporator.
In the case of plate evaporators, the clogging of even a few plates (or gaps) can cause the plate to seize (clogging), leading
to damage of part of the exchanger, even if water flow seems regular and operation is apparently normal.
For this purpose there is a plate showing the standard water filter symbol affixed to the unit alongside the water inlet
connection.
NOTE
In units equipped with a double pump, changeover between the two pumps is performed by means of the switch inside the
electrical cabinet. Pump changeover is a manual operation that must be performed by the user.
ATTENTION
The pump must never run dry.
4.4.6 Antifreeze resistance
The CY units can be equipped with a antifreeze resistance, if requested.
It is composed by a resistance wounded around the evaporator, the tank and the pump (if they are present).
The resistance is checked by the electronic board, and its function is to prevent the components of the unit against the risk of
freezing, when the temperature is lower than 0°C.
The logic and therm regulation parameter are described in the Chapter 7 “Electronic Board“.