NANO NPC 280 User manual

n-psi-C1-SM-02-01-US
NPC 280 - 400 60 Hz UL
SERVICE MANUAL

1
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
I NDEX
I NDEX ...............................................................................................................................................................1
G ENERAL I NFORMATION ................................................................................................................................3
1.1 How to interpret the model...................................................................................................... 4
S AFETY .............................................................................................................................................................5
2.1 General .................................................................................................................................... 5
2.2 Liquids of the user circuit........................................................................................................ 5
2.3 Lifting and carriage precautions .............................................................................................. 5
2.4 Installation precautions............................................................................................................ 6
2.5 Precautions during operation................................................................................................... 6
2.6 Maintenance and repair precautions........................................................................................ 6
2.7 Refrigerant gases ..................................................................................................................... 7
2.7.1 Refrigerant safety schedule ....................................................................................................................... 7
T ECHNICAL DATA ............................................................................................................................................9
3.1 Other data relative to the standard machines........................................................................... 9
3.1.1 Dimensions ................................................................................................................................................ 9
3.1.2 Characteristics of pumps and of the fans ................................................................................................ 10
3.1.3 Sound Level Measurements ..................................................................................................................... 10
D ESCRIPTION .................................................................................................................................................11
4.1 Components............................................................................................................................. 11
4.2 Cooling circuit ......................................................................................................................... 11
4.3 Compressors ............................................................................................................................ 11
4.4 Condenser ................................................................................................................................ 11
4.5 Evaporator ............................................................................................................................... 11
4.6 Tank......................................................................................................................................... 11
4.7 Pump........................................................................................................................................ 11
4.8 Fans.......................................................................................................................................... 12
4.9 Casing ...................................................................................................................................... 12
4.10 Materials in contact with the liquid to be cooled .................................................................... 12
4.11 Minimum distances from walls in the installation ambient..................................................... 12
4.12 Electrical circuit....................................................................................................................... 12
4.13 Negative ambient temperatures (not present in models for 460/3/60 power supply).............. 12
I NSTALLATION ...............................................................................................................................................13
5.1 Inspection ................................................................................................................................ 13
5.2 Positioning............................................................................................................................... 13
5.3 Antifreeze protection ............................................................................................................... 13
5.3.1 Operating limits ....................................................................................................................................... 14
5.4 Hydraulic connections ............................................................................................................. 14
5.5 Expansion tank ........................................................................................................................ 15
5.6 Electrical connections.............................................................................................................. 16
S TART UP .......................................................................................................................................................19
E LECTRONIC CONTROL ................................................................................................................................21
7.1 User interface; Leds and buttons .............................................................................................21
7.2 Display..................................................................................................................................... 21
7.2.1 The icons of the display ........................................................................................................................... 21
7.3 Function of the buttons............................................................................................................ 22
7.3.1 Button function in combination ............................................................................................................... 23
7.4 Symbols and leds of the display ..............................................................................................23
7.5 Remote terminal ...................................................................................................................... 23

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
7.6 Visualization during an alarm ..................................................................................................24
7.6.1 Alarm icons ..............................................................................................................................................24
7.7 How to switch off the buzzer ...................................................................................................24
7.8 First start up..............................................................................................................................24
7.9 Programming by keyboard .......................................................................................................24
7.9.1 Access to the parameters ..........................................................................................................................25
7.9.2 How to change the value of a parameter .................................................................................................25
7.10 Values shown on the display....................................................................................................25
7.10.1 How to display the values inside a circuit ...............................................................................................25
7.10.2 How to move the visualization of the values from circuit n° 1 to circuit n° 2 .........................................25
7.11 Unit start up and stop ...............................................................................................................25
7.11.1 Unit start up and stop from keyboard ......................................................................................................25
7.11.2 Unit start up and stop from digital input .................................................................................................26
7.12 Function menu, button “ I ”...................................................................................................26
7.12.1 How to view and reset the status of an alarm ..........................................................................................26
7.12.2 How to reset a compressor thermal protection alarm .............................................................................27
7.12.3 How to display the alarm history list .......................................................................................................27
7.13 Other displaying .......................................................................................................................27
7.13.1 How to display the set point .....................................................................................................................27
7.13.2 How to modify the set point ......................................................................................................................27
7.13.3 Display read-out on unit stopped by remote control ...............................................................................28
7.14 Compressors unloading function..............................................................................................28
7.15 Probe key..................................................................................................................................28
O THER COMPONENTS SETTING ....................................................................................................................29
8.1 Compressor integral protection (PI).........................................................................................29
8.2 Refrigerant high and low pressure switches.............................................................................29
8.3 Compressor operation ..............................................................................................................30
8.4 Pressure transducers .................................................................................................................31
8.5 Fan regulation...........................................................................................................................31
8.6 Level sensor..............................................................................................................................32
O PERATION AND MAINTENANCE ..................................................................................................................33
9.1 Operation..................................................................................................................................33
9.2 Maintenance .............................................................................................................................33
9.3 Unit access................................................................................................................................33
9.4 Emptying the process water circuit ..........................................................................................34
9.5 Maintenance schedule ..............................................................................................................34
T ROUBLE SHOOTING .....................................................................................................................................35
S
ETTING TABLES ...........................................................................................................................................39
11.1 Parameter setting......................................................................................................................39
11.1.1 Thermoregulation parameters .................................................................................................................39
11.1.2 Displaying parameters .............................................................................................................................39
11.1.3 Configuration parameters ........................................................................................................................39
11.1.4 Dynamic set point parameters (NOT ENABLED FUNCTION) ...............................................................40
11.1.5 Energy saving parameters (NOT ENABLED FUNCTION) - Double set point .......................................40
11.1.6 Compressor parameters ...........................................................................................................................40
11.1.7 Auxiliary outlet parameters (NOT ENABLED FUNCTION) ...................................................................40
11.1.8 Condensation fan parameters ..................................................................................................................41
11.1.9 Antifreeze resistance - supply - boiler parameters (NOT ENABLED FUNCTION) ................................41
11.1.10Defrosting parameters (NOT ENABLED FUNCTION) ..........................................................................41
11.1.11Heat recuperator parameters (NOT ENABLED FUNCTION) ...............................................................41
11.1.12Alarm parameters ....................................................................................................................................41
ALARMS ..........................................................................................................................................................43
12.1 Alarm codes and actions ..........................................................................................................43

3
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
C HAPTER 1
G ENERAL I NFORMATION
The machines described in this manual are called “WATER REFRIGERATORS”.
This manual is written for those responsible for the installation, use and maintenance of the unit.
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 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 electrical panel has been designed following UL508A standard rule (Industrial Control Panels), homologated with UL file number E249753
and marked. .
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:
The following warning symbols are shown on the stickers on the unit. If requested, the same stickers are available also in French. Their meaning
is the following:
Process water inlet
Process water outlet
Indications for lifting the unit
Water drainage point from the machine
Electric shock risk
Risk of burns from contact with high-temperature surfaces
Direction of the refrigerant fluid and water circuit
Direction of pump rotation (if installed)
Water filling point
Air vent
Hole for inserting bars for lifting the machine
Table 1 S
YMBOLS
WARNING SYMBOL DESCRIPTION
To maintain overcurrent, short-circuit, and ground-fault protection, the
manufacturer’s instructions for selection of overload and short circuit
protection must be followed to reduce the risk of fire or electric shock.
In an overload or a fault current interruption occurs, circuits must be checked
to determine the cause of the interruption.
If a fault condition exists, the current-carrying components should be
examined and replaced if damaged, and the integral current sensors must be
replaced to reduce the risk of fire or electric shock.
Table 2 W
ARNING SYMBOLS

4
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
1.1 How to interpret 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 first page of this manual.
Hazardous voltage.
All doors must be closed before energizing the panel.
Read and understand operator’s manual before using this machine.
Failure to follow operating instructions could result in death or serious injury.
Moving parts can crush and cut.
Do not operate with guard removed.
Follow lockout procedure before servicing.
Hazardous voltage.
Disconnect power before servicing or cleaning.
MODEL DESCRIPTION
refrigerant with 2 refrigeration circuits
power indicative of the refrigeration compressor in hp
C = CHILLER
P = PRECISION
N = nano-purification solutions
WARNING SYMBOL DESCRIPTION
Table 2 W
ARNING SYMBOLS
NPC XX 2

5
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
C HAPTER 2
S AFETY
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.
It must therefore be isolated from the electricity supply network before being opened. Maintenance operations involving work inside the machine
must be performed by skilled and adequately qualified personnel equipped with suitable protection means (active and passive, e.g. work gloves)
ton ensure work in maximum safety.
Do not allow extraneous persons (such as children) where the machine is installed.
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.
ATTENTION
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.
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.
2.2 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.
Additives and glycol suppliers must guarantee compatibility with the materials. For further information refer to 4.10 “Materials in contact with
the liquid to be cooled” .
ATTENTION
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 refrigerator is no longer used, dangerous liquids must be disposed of
by firms specialised and authorised for treating them.
2.3 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 weight values
shown in the following table were obtained with the unit empty, pump P3 and axial fans.
The manufacturer does not supply bars, belts and lifting hooks with the unit.
MODEL 280 330 400
Weight (kg) 1245 1285 1345
Weight (lb) 2744 2832 2965
Table 3 W
EIGHTS

6
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
NOTE
Weight values are guideline, with the water circuit empty. The values may vary in relation to the configuration of the unit (pump type, supply
type, and ventilation type).
2.4 Installation precautions
The connections to be made are for the process water circuit. Use the electrical diagram accompanying this manual to for the connection to the
power grid.
2.5 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.
ATTENTION
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.
2.6 Maintenance and repair precautions
ATTENTION
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.
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.

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
ATTENTION
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.
ATTENTION
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.
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.
For every unit establish a suitable time schedule for cleaning operations.
ATTENTION
If replacement parts are needed use only original spares.
Avoid to damage the safety valves and other pressure relief devices.
All guards must be reinstated after carrying out repair or maintenance work.
ATTENTION
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.
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 vapours 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.
2.7 Refrigerant gases
R407C is used as refrigerant in these units. Never attempt to mix refrigerant gases. The manufacturer's instructions and local safety regulations
should always be observed when handling and storing high pressure gas cylinders.
2.7.1 Refrigerant safety schedule
R407C
Denomination: 23% Difluoromethane (R32);
25% Pentafluoroethane (R125);
52% R134a
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.

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
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 vapours 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 three components.
Respiratory protection: For rescue and maintenance work in tanks, use autonomous breathing apparatus. The
vapours 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: Similar to ether.
Boiling point: -43.9°C at atm. press.
Flammability point: Non flammable.
Relative density: 1.138 kg/l at 25°C.
Solubility in water: Negligible.
STABILITY AND REACTIVITY
Stability: No reactivity if used with the relative instructions.
Materials to avoid: Alkaline metal, earthy alkaline metals, granulated metals salts, Al, Zn, Be, etc. in powder.
Hazardous decomposition products: Halogen acids, traces of carbonyl halides.
TOXICOLOGICAL INFORMATION
Acute toxicity: (R32) LC50/inhalation/4 hours/lab. rats >760 ml/l
(R125) LC50/inhalation/4 hours/lab. rats >3480 mg/l
(R134a) ALC/inhalation/4 hours/lab. rats = 567 ml/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): R125: 0.84 - R134a: 0.28
Ozone depletion potential ODP (R11=1): 0
CONSIDERATIONS ON DISPOSAL
Usable with reconditioning.

9
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
C HAPTER 3
T ECHNICAL DATA
The main technical data are given on the machine data plate:
ATTENTION
The performance of the unit mainly depends on the flow and temperature of the water in the user circuit and on the temperature of the
thermal exchanger fluid of the condenser. These data are defined during the offer stage.
3.1 Other data relative to the standard machines
3.1.1 Dimensions
See enclosures.
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.
SHORT CIRCUIT CURRENT
Short circuit current.
HIGHER MOTOR FLA
Max. absorbed current.
MAX. CONSUMPTION (I max)
This is electrical current consumed by the unit during the limit working conditions.
INSTALLED POWER (P max)
It is the power absorbed by the unit during the limit working conditions.
PROTECTION
As defined by the EN 60529 European standard / NEMA 250 international standard.
WIRING DIAGRAM
Number of wiring diagram.
REFRIGERANT
This is the refrigerant fluid in the unit.
REFRIGERANT QUANTITY
This is the quantity of refrigerant fluid contained in the unit.
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
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.
CONDENSER COOLING FLUID
Fluid the machine uses to cool the condenser.
MAX. WORKING PRESSURE
Maximum design pressure of the condenser cooling circuit.
MAX. TEMPERATURE
Maximum designed temperature of the cooling circuit of the condenser.
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.
Table 4 D
ATA PLATE AND MEANING OF ABBREVIATIONS

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
3.1.2 Characteristics of pumps and of the fans
NOTE
The values in the table may vary in relation to the model and configuration of the unit. In this case reference should be made to the data in the
offer.
NOTE
The head is the head available to the user. It is possible for the pump installed to be different from the standard. There are two numbers for
the flow rate and pressure: the first number refers to the nominal conditions while the second to the maximum conditions.
3.1.3 Sound Level Measurements
* at distance of 1 metre (3,2 FT)
** global
*** (NOT present with 460/3/60 Hz supply)
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 280 330 400
Tank capacity water volume (litres)
(galUS)
500
132
500
132
500
132
PUMP
P3
water flow rate (m
3
/h)
(gpm)
7.7/48
17.6/211.3
8.2/48
17.6/211.3
10.4/48
17.6/211.3
pump head (bar)
(PSI)
3.8/1.5
57.0/21.8
3.8/1.5
57.0/21.8
3.7/1.5
57.0/21.8
nominal power (kW) 444
nominal power (460/3/60 Hz) (kW) 444
PUMP
P5
water flow rate (m
3
/h)
(gpm)
7.7/48
17.6/211.3
8.2/48
17.6/211.3
10.4/48
17.6/211.3
pump head (bar)
(PSI)
5.5/3.0
80.5/44.5
5.5/3.0
80.5/44.5
5.4/3.0
80.5/44.5
nominal power (kW) 7.5 7.5 7.5
nominal power (460/3/60 Hz) (kW) 7.5 7.5 7.5
CENTRIFUGAL FANS
(NOT present with 460/3/60 Hz
supply)
number of fans 222
available head (Pa)
(PSI)
450
0.06
440
0.06
420
0.06
total air flow (m
3
/h)
(gpm)
40000
176114
40000
176114
40000
176114
AXIAL FANS
number of fans 222
total air flow (50/60Hz) (m
3
/h)
(gpm)
45400
199860
43800
192845
42000
184920
Table 5 C
HARACTERISTICS OF STANDARD UNITS
Fan Lp dB(A) * Lw dB(A) **
NPC 280 axial 79,0 92
centrifugal *** 80,0 92,9
NPC 330 axial 79,0 92
centrifugal *** 80,0 92,9
NPC 400 axial 79,0 92
centrifugal *** 80,0 92,9

11
The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
C HAPTER 4
D ESCRIPTION
4.1 Components
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.
The machines essentially consist of the following components:
• Refrigerant compressor
• Condenser
• Evaporator
•Tank
•Pump
• Frame/outer panelling
• Electronic controller
4.2 Cooling circuit
Models TAEevo have two refrigerant circuits with two compressors connected in parallel (tandem).
Each circuit consists of the following components:
• refrigerant fluid used R407C;
• Scroll hermetic compressor;
• pressure switches for high and low refrigerant pressure;
• high pressure transducer for fan electronical regulation and for unloading (NOT present with 460/3/60 supply, centrifugal fans);
• liquid solenoid valve (with prismatic tank and plate-type evaporator);
• thermostatic throttle valve with external equalization;
• dryer filter;
• liquid flow sight glass;
• refrigerant manometers;
• check valve;
• Schrader service valves;
Consult the enclosed drawings for additional information.
4.3 Compressors
All the machines are equipped with SCROLL compressors, which are distinguished for their high energy efficiency, low vibrations and
consequent silence in normal operation.
They are cooled by the aspirated gas, protected against overheating of the windings by an internal module that monitors their temperature and,
upstream, by magnetothermic circuit breakers. These components are housed in a closed, but easily accessible, compartment.
4.4 Condenser
Condensation occurs through fin-pack coils consisting of copper tubes and collectors, aluminium fins and shoulders in galvanised sheet.
4.5 Evaporator
The evaporator is a finned pack type; the water flows in contact with the finned surface and at a speed that guarantees low pressure drops, while
the refrigerant fluid flows inside the tubes.
In the TAEevo models, the exchanger is protected against the formation of ice, caused by low evaporation temperatures, through an anti-freeze
function in the electronic controller. A probe monitors the temperature of the evaporator outlet water. If it is necessary to achieve a negative
ambient/water temperatures, a mixture of water and glycol must be used.
To drain the circuit, see Chapter 9.4 “Emptying the process water circuit” .
4.6 Tank
The storage tank is cylindrical.
The tank can be protected against freezing by means of an electric heater managed by the electronic controller. A level sensor in the tank serves
to signal low water level conditions. The standard supply includes anti-condensation cladding, a drain valve and an air bleed valve. An internal
bypass between the water delivery and return connections, makes it possible to read the anti-freeze probe if the unit's process water inlet and
outlet connections are inadvertently closed. In this case the unit stops due to tripping of the antifreeze alarm and the shut-off valves must be
reopened.
The bypass serves exclusively to allow an antifreeze alarm to trip (if present) and to allow the pump to run with a reduced water flow rate
without damage. It is advisable to avoid repeated antifreeze alarm trip cycles in the foregoing conditions.
4.7 Pump
Centrifugal pumps are installed and it is possible to choose between 2 different types, which provide two different pressures based on
requirements (a 3 or 5-barg pump). It is also possible to have units without pump.
The unit can be equipped with a tandem pump, managed by the controller.
The pump seals are made of ceramics/treated carbon/EPDM.
ATTENTION
Bleed the circuit by unscrewing the bleed cap on the pump whenever the water circuit is filled .See 5.4 “Collegamenti idraulici” .

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
NOTE
The pump must never run dry.
4.8 Fans
Axial fans
The fans of axial type consist of a die-cast aluminium fan with sickle profile.
The protection rating of the fans is IP54.
All fans have “F” insulation class to assure the external working with all types of climates. The assembly is completed with a superior (support
to the fan) safety protection grill.
Centrifugal fans (NOT present in models with 460/3/60 supply)
These are double drive fans with the fanwheel coupled directly to the motor shaft and they feature ON/OFF control. The delivery port is located
on the top of the unit.
4.9 Casing
The base, uprights and panels are made of galvanized carbon steel and held together by screws and/or rivets. All panels undergo a phosphor
degreasing process followed by epoxy polyester powder coating.
The frame is designed to allow easy access to all machine components.
4.10 Materials in contact with the liquid to be cooled
The chosen materials are:
• evaporator with copper tubes, aluminium fins and galvanized sheet metal shoulders
• carbon steel tank;
The pump mechanical seals are made of ceramics, graphite and/or EPDM.
4.11 Minimum distances from walls in the installation ambient
See enclosures.
4.12 Electrical circuit
For the electrical connections, see Chapter 5 “Installation“, Installation, and consult the enclosed drawings.
4.13 Negative ambient temperatures (not present in models for
460/3/60 power supply)
In the presence of sub-zero ambient temperatures (-20) the unit is equipped with a system that assures perfect operation, also in the presence of
harsh temperatures.
The additional elements fitted are:
• electronic fans speed control;
• crankcase heaters
• electrical cabinet heaters
The pump and tank can be equipped with electrical heaters to prevent icing up (instead of using glycol solutions).
Model width depth height
NPC 280-400 (mm)
(in)
1255
49.4
3290
19.5
2140
84.3

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
C HAPTER 5
I NSTALLATION
ATTENTION
Before carrying out the installation or operating on this machine, ensure that all the personnel has read and understood the Chapter 2
“Safety“ in this manual.
5.1 Inspection
Immediately after uncrating, inspect the unit.
5.2 Positioning
1. The unit may be installed both outdoors and indoors.
2. If installed indoors, the room must be well ventilated and with a sufficient height which allows the air to be expelled by fans. In
some cases it may be necessary to install fans or extractors to limit the temperature of the room.
3. The minimum and maximum working ambient temperature are specified on the unit data plate. In extreme temperature conditions,
the protection devices may trip.
4. The machine must be positioned on any flat surface capable of supporting its weight.
5. Leave at least one metre around the unit to permit access during service operations.
6. Do not obstruct or disturb the condenser's flow of thermal exchanging air.
5.3 Antifreeze protection
Even if the minimum working ambient temperature is above 0°C it is possible for the machine - during stoppages in the cold seasons - to find
itself in an environment with a temperature below 0°C.
In these cases, if the machine is not emptied, antifreeze (ethylene glycol) must be added in the following percentages to prevent the formation of
ice:
Add the following anti-freeze (ethylene glycol) percentages in order to avoid freezing when operating at low water outlet temperature:
ATTENTION
Carry out the level sensor calibration when the unit is activated the first time. Repeat the operation each time the composition of the process
liquid changes.
Ambient temperature up to
[°C] (°F)
Ethylene Glycol
[% in weight]
0 (32) 0
-5 (23) 15
-10 (14) 25
-15 (5) 30
-20 (-4) 40
Table 6 A
DDING ETHYLENE GLYCOL BASED ON THE AMBIENT TEMPERATURE
Water outlet temperature up to
[°C] (°F)
Ethylene Glycol
[% in weight]
5 (41) 0
0 (32) 19
-5 (23) 27
-10 (14) 34
-15 (5) 39
-20 (-4) 44
Table 7 A
DDITION OF E THYLENE GLYCOL ACCORDING TO THE WATER OUTLET TEMPERATURE

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
5.3.1 Operating limits
The operating limits are decided at the time of sale. Refer to the contract data.
(*) With outlet water to a temperature of 15 °C
(**) Not present in models with 460/3/60 supply.
(***) With unit equipped with condensing pressure control.
(****) For temperatures below +5°C (41°F) use antifreeze solutions.
5.4 Hydraulic connections
NOTE
All hydraulic connections must be carried out by the customer.
1. Connect the unit to the water pipelines respecting the water flow direction as indicated in the annexed overall dimension drawings.
2. Provide two cocks (one at the inlet and one at the outlet) for excluding the unit when maintaining without emptying the user water
circuit.
3. Fill the tank with water using:
• A remote discharge system. In this case it is necessary to leak manually the air from the tank by operating on the manual valve.
• If there are frequent air infiltrations into the water circuit it is advisable to install an automatic bleed valve.
4. If the machine is supplied without a pump, make sure that the pump installed by the user has the suction directly connected to the
tank outlet.
NOTE
The pump must never run dry.
ATTENTION
If the unit is furnished without hydraulic group, it is necessary to install a pump for the evaporation water circuit.
For maintenance purposes, we recommend installing a water drainage cock in the lower part of the circuit.
Evaporator water connection size
ATTENTION
For correct operation, we strongly recommend the installation of a water filter to be connected to the inlet pipe to avoid the entry of solid
particles that could damage the pumps. The non-observance of this prescription can cause big damages to the evaporator.
Minimum Maximum
ambient air temperature
Standard version °C /°F -5 /23 43 /109.4(*)
ambient air temperature
(**) °C /°F -20/-4(***) 43/109.4(*)
evaporator inlet water
temperature °C /°F -5 /23(****) 35 /95
evaporator outlet water
temperature °C /°F -10 /14(****) 30 /86
NPC
unit model 280-400 Max. pressure [Bar]
units with tank
Evaporator water
IN/ OUT
connections
2” 1/2 NPT 6

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
5.5 Expansion tank
If the hydraulic circuit is of closed type, it is necessary to install an expansion tank.
The expansion tank must always be connected at pump inlet.
To calculate the minimum volume of the expansion tank required for a given installation, the formula below cab be used and is valid if the
pressure is less than or equal to 0.5 bar when the pump is stopped and the maximum working pressure of the expansion tank is greater than or
equal to 4 bar.
The volume of the expansion tank V in litres is given by the formula:
V = 2 · Vt · (Ptmin - Ptmax)
where:
Example of calculation:
Vt=200 litres
percentage of ethylene glycol in volume =30%
tmin =5°C from the table Ptmin=(1.045+1.041)/2 = 1.043
tmax =40°C from the table Ptmax=1.0282
V=2 · 200 · (1.043 - 1.0282)=5.92 litres
Table of specific weights P
Process water inlet Process water outlet
When filling the circuit with liquid check to ensure the absence of air bubbles and
contaminants. If the pump runs noisily or emits anomalous noise it may be necessary to
bleed the liquid circuit in order to prime the pump.
The procedure is as follows:
• unscrew the filler/breather plug at the top of the pump
• fill the hydraulic circuit until water starts to overflow from the filled hole
• refit the plug and tighten it
Repeat the operation if the pump continues to run noisily, in such a way as to eliminate
any air that had previously remained trapped in the impeller vanes.
In the event of double pump, keep particular attention during priming the pump. It is
necessary to verify first the pump positioned on the top.
Vt= total volume of the circuit in litres
Ptmin= specific weight at the minimum temperature obtainable by water
over the year in °C (even with the plant stopped)
Ptmax= specific weight at the maximum temperature obtainable by water
over the year in °C (even with the plant stopped)
% Glycol 0% 10% 20% 30% 40%
Temperature [°C]
-20(-4) 1,0036 1,0195 1,0353 1,0511 1,0669
-10(14) 1,0024 1,0177 1,033 1,0483 1,0635
0(32) 1,0008 1,0155 1,0303 1,045 1,0598
10(50) 0,9988 1,013 1,0272 1,0414 1,0556
20(68) 0,9964 1,0101 1,0237 1,0374 1,051
30(86) 0,9936 1,0067 1,0199 1,033 1,0461
40(104) 0,9905 1,003 1,0156 1,0282 1,0408
Table 8 S
PECIFIC WEIGHTS
PLUG

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
5.6 Electrical connections
The machine must be connected to the main power supply in accordance with the laws and regulations in force in the country of installation, after
verifying the wiring diagram annexed to the unit.
Voltage, frequency and the number of phases must comply with the values indicated on the machine data plate.
Main distribution systems in United States:
Main distribution systems in Canada:
System Nominal Voltage Utilization Voltage
120 115 110
240/120 230/115 220/110
600
480
240
575
460
230
550
440
220
480 460 440
480/277
208/120
460/266
200/115
440/254
190/110
240/120 230/115 220/110
240/120 230/115 220/110
System Nominal Voltage Utilization Voltage
240
480
600
230
460
575
220
440
550
240/120 230/115 220/110
600
480
240
575
460
230
550
440
220
600
480
240
575
460
230
550
440
220
600/347
480/277
416*/240
208/120
575/332
460/266
400*/230
200/115
550/318
440/254
380*/220
190/110

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400
For mains power input:
1. Connect the machine (terminal in the electrical panel) to the earth system of the building;
2. Provide protection against direct contact of at least NEMA Type 1 upline from the power cable;
3. Fit a device protecting the power cable from overcurrent (short-circuit) (see indication in the electrical diagram) upline from the
power cable. For this purpose, all protection devices must be homologated (“listed”).
4. Use conductors which can carry the maximum current required at the maximum ambient operating temperature, according to the
type of installation chosen (seeindication in the electrical diagram). Use only UL marked copper cables, in conformity with NEC
(NATIONAL ELECTRICAL CODE) and CEC (CANADIAN ELECTRICAL CODE).
5. After the connection to the circuit breaker/switch (as indicated in the wiring diagram), the unit’s power cable must exit the unit by
the appropriate hole positioned on the back panel and identified by a label with the indication of the power supply.

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The data inside this manual are not binding and they can be modified by the manufacturer without notice. All rights reserved.
NPC 280 - 400