eneren ENW Series User manual

HF61GJ0632B / 06_21
USER MANUAL
ENW
EN
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
WATER-COOLED HEAT PUMPS OR CHILLERS
AIR CONDITIONING
INDUSTRIAL APPLICATIONS AND PROCESS CONTROL

Modello - Model
Matricola - Serial number
Codice identicativo - ID code
Data di produzione - Date of production
Categoria PED/ 2014/68/EU - Category PED/ 2014/68/EU
Procedura di valutazione conformità PED - PED conformity module
Max pressione ammissibile (PS) lato alta pressione - Max allowable pressu-
re (PS) high pressure side [bar-r]
Max pressione esercizio (PS) lato bassa pressione - Max allowable pressure
(PS) low pressure side [bar-r]
Max/min temperatura di stoccaggio - Max/min storage temperature [°C]
Max/min temperatura ambiente di funzionamento - Max/min ambient
working temperature [°C]
Potenza frigorifera* - Cooling capacity* [kW]
EER*
Potenza termica* - Heating capacity* [kW]
COP*
Refrigerante - Refrigerant [Ashrae 15/1992] / GWP
Carica refrigerante - Refrigerant charge [kg]
C1 C2 C3 C4
Refrigerante aggiunto - Added refrigerant [kg]
C1 C2 C3 C4
Carica totale refrigerante - Total charge refrigerant [kg]
CO2 equivalenti - CO2 equivalent [t]
Taratura pressione lato alta - High pressure switch set [bar-r]
Taratura pressione lato bassa - Low pressure switch set [bar-r]
Taratura valvola sicurezza refrigerante lato alta/bassa pressione - Safety
valve refrigerant high/low pressure side set [bar-r]
Massima pressione esercizio circuito acqua - Max working pressure water
circuit [bar-r]
Taratura valvola sicurezza acqua - Safety valve water side set [bar-r]
Alimentazione elettrica - Power supply
Potenza massima assorbita - Max absorbed power [kW]
Corrente massima - Full load ampere FLA [A]
Corrente di spunto - Starting current LRA [A]
Schema elettrico - Wiring diagram
Schema frigorifero - Refrigeration diagram
Peso a vuoto - Empty weight [kg]
* EN14511-2
Contiene gas uorurati ad effetto serra disciplinati dal protocollo di Kyoto/
Contains uorinated greenhouse gases governed by the Kyoto protocol
Ermeticamente sigillato/Hermetically sealed
SAFETY SYMBOLS
CWARNING
With reference to additions or
recommendations for the cor-
rect use of the unit.
ADANGER
With reference to dangerous
situations that may occur with
the use of the unit to guarantee
personal safety.
BATTENTION
With reference to dangerous
situations that may occur with
the use of the unit to prevent
damage to property and to the
unit itself.
Each unit has an identication plate that is located on
its frame and inside the electrical control panel, which
shows all the data necessary for the installation, main-
tenance and traceability of the machine.
THE LABEL SHOWS THE FOLLOWING DATA:
ŪManufacturer/Marketing body
ŪCE mark, possibly accompanied by a subscript that
identies the certifying body for the Pressure Equip-
ment Directive 2014/68/EU (PED). The number of
the certifying body must be indicated for units of a
PED category equal to or greater than class 2.
ŪSeries and size of the unit
ŪDate of manufacture
ŪMain technical data
Note the model, the serial number, the nal refrigerant
charge and the machine reference diagrams attached
to this manual so that they can be easily found in case
of data plate damaging and system maintenance.
BATTENTION
Never remove the label. This shows the serial number
of the unit from which it is possible to obtain informa-
tion about the technical features and the components
installed, to then identify the unit correctly.

GENERAL CAUTIONARY NOTES
The operating rules contained in this manual are an integral part
of the unit supply and are valid exclusively for the units covered by
this manual. They contain all the useful and necessary informa-
tion for safe operation and ideal, recommended use of the unit.
The declaration of conformity is attached individually to the litera-
ture kept on the machine, usually inside the control cabinet.
Please follow the instructions given below:
ŪRead carefully the instruction manual which should be consi-
dered an integral part of the unit. Every operator and the per-
sonnel in charge of unit maintenance must read the manual
throughout carefully and observe its prescriptions.
ŪThe employer is requested to make sure that the operator has
the necessary aptitude requirements for operating the unit
and has carefully read the manual.
ŪThe instruction manual must be easily available to the ope-
ration and maintenance personnel. Keep the manual for the
entire working life of the unit. Make sure any updates that are
received are integrated into the text.
ŪHand over the manual to any other user or subsequent owner.
ŪUse the manual so that the contents are not damaged - enti-
rely or in part. Do not remove, tear off or rewrite parts of the
manual for any reason.
ŪKeep the manual with care; it must be available at the unit,
stored in a special container, to protect it from moisture and
heat, until nal scrapping of the machine. The location where
the manual is kept must be known to the user of the unit, to the
managers, to the persons in charge of transportation, instal-
lation, use, maintenance, repairs, and end-of-life dismantling
and scrapping. If the manual is lost or partially damaged, so
that it is no longer possible to read all of its contents, it is advi-
sable to request a new one from the manufacturer.
ŪAvoid hasty and incomplete preparation that lead to improvi-
sation and cause many accidents.
Pay close attention to the safety symbols shown in the table on
the previous page and to their meaning.
Before starting to work, read through and strictly observe the fol-
lowing suggestions:
Ūthe operator must always have the instruction manual readily
available at any time;
Ūplan each action carefully;
Ūbefore beginning to work, make sure that the safety devices
work properly and you have no doubts about their operation;
otherwise, do not under any circumstances start the unit;
Ūcarefully observe the warnings relating to special hazards con-
tained in this manual;
Ūconstant and accurate preventive maintenance always gua-
rantees high operational safety of the unit. Never postpone
necessary repairs and have them carried out exclusively by
skilled personnel, by only using original spare parts.
THE MANUFACTURER shall not be liable for any accident to per-
sons or property which may occur due to:
Ūfailure to comply with the instructions in this manual regarding
the operation, use and maintenance of the unit;
Ūviolent actions or incorrect operations during the maintenance
of the unit;
Ūchanges made to the unit without a prior written authorisation
obtained from the MANUFACTURER;
Ūevents that are, in any case, unrelated to the normal and cor-
rect use of the unit;
Ūin any case, should the user attribute an incident that may ha-
ve occurred to a unit fault, he or she must prove that the resul-
ting damage occurred has a main and direct consequence of
such “fault”.
This manual reects the state of the art at the time of unit sale:
The MANUFACTURER reserves the right to update its products
and manuals without any obligation to update earlier products
and manuals, except in special circumstances. These may not be
considered inadequate only because they have been subsequently
updated based on new experience.
BATTENTION
ŪThe installer must provide adequate documentation that
must comply with EN 378-3 if applicable in the country of
installation; otherwise, reference should be made to the local
regulations in force.
ŪWhen installing or when working on the chiller unit, it is neces-
sary to strictly comply with the regulations contained in this
manual, observe the instructions provided on-board the unit
and in any case, adopt all the necessary precautions.
ŪThe presence of pressurised uids in the refrigerant circuit
and of electrical components can create hazardous situations
during installation and maintenance.
ŪAny action on the unit must be carried out by qualied and
authorised personnel. In the event of a fault, do not attempt
repairs on your own and do not let unauthorised technicians
carry out repairs, or the guarantee will no longer be valid.
ŪThe initial start-up must be carried out exclusively by qualied
personnel authorised by the marketing entity (see annex).
ŪBefore performing any work on the unit, be sure to have di-
sconnected power supply.
ŪFor maintenance service or repairs always and exclusively
use original spare parts. THE MANUFACTURER declines all
responsibility for damages that may occur due to non-com-
pliance with the above.
ŪThe unit is guaranteed according to the contractual agree-
ments entered into upon its sale: however, failure to comply
with the rules and instructions contained in this manual and
any modication in the unit not previously authorised, will cau-
se an immediate loss of guarantee validity.
ŪThis manual describes the intended use of the unit and pro-
vides instructions for its handling, installation, assembly,
adjustment and use. It supplies information on the maintenan-
ce schedule, how to order spare parts, the presence of residual
risks, and staff training. Therefore, before handling, installing,
using or carrying out any maintenance on the unit, read the
manual very carefully.
ŪPlease note that the use and maintenance manual is not in-
tended to be a substitute for adequate user experience. For
particularly complex maintenance operations, this manual
serves as a reminder of the main tasks to carry out for opera-
tors having received specic training, for example, in the form
of training courses delivered by the manufacturer.
ŪPlease ensure that all users have fully understood the direc-
tions for use and the meaning of any symbols provided on the
unit.
ŪPossible accidents can be avoided by following these tech-
nical instructions drafted in accordance with the Machinery
Directive 2006/42/EC and subsequent additions.
ŪIn any case, always comply with national safety regulations.
ŪDo not remove or damage guards, decals, stickers and wor-
ding, especially any that are required by law. Adhesive plates
are applied to the unit to make it safer to use, therefore, it is
very important to replace them if they are no longer legible.
CWARNING
ŪThe electrical wiring, hydraulic and refrigeration diagrams and
the technical data shown in this manual are supplied for gui-
dance only and may be changed without prior notice for the
purpose of improving the product range. For detailed informa-
tion on specic models, refer to the specic documentation
attached to the each product.
Any updates or additions to this use and maintenance manual
are to be considered an integral part of the manual and may be
requested via the contact phone numbers listed in this manual.
Contact the MANUFACTURER for additional information and to
share any feedback and recommendations aimed at improving
the manual.
If the unit is transferred to a new owner, the MANUFACTURER ex-
pects you to please notify the address where to send any manual
additions for the new user.
4

TABLE OF CONTENTS
1 GENERAL DESCRIPTION � � � � � � � � � � � � � � � �p.6
1.1 SERIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.6
1.2 STRUCTURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.6
1.3 FIELD OF APPLICATION . . . . . . . . . . . . . . . . . . . . . . .p.6
1.4 COOLING CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . .p.6
1.5 MODELS AND VERSIONS . . . . . . . . . . . . . . . . . . . . . .p.7
1.6 WATER CIRCUIT - ONLY COOLING . . . . . . . . . . . . . . .p.8
1.7 WATER CIRCUIT - REVERSIBLE HEAT PUMP. . . . . . .p.9
2 SAFETY PRESCRIPTIONS � � � � � � � � � � � � � �p.10
2.1 GENERAL SAFETY RULES. . . . . . . . . . . . . . . . . . . . .p.10
2.2 GENERAL PRECAUTIONS . . . . . . . . . . . . . . . . . . . . .p.10
2.3 LOCATION OF SAFETY DATA PLATES . . . . . . . . . . .p.12
2.4 MAINTENANCE PRECAUTIONS . . . . . . . . . . . . . . . .p.12
2.5 PRECAUTIONS IN CASE OF REFRIGERANT
LEAKAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.13
3 PRELIMINARY PROCEDURES � � � � � � � � � � �p.15
3.1 TRANSPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.15
3.2 INSPECTION ON RECEIPT . . . . . . . . . . . . . . . . . . . .p.15
3.3 CONVEYANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.15
3.4 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.17
3.5 SITING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.17
4 INSTALLATION � � � � � � � � � � � � � � � � � � � � � � � �p.18
4.1 INSTALLATION CLEARANCE REQUIREMENTS . . . .p.18
4.2 GENERAL GUIDELINES FOR PLUMBING
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.18
4.3 WATER CONNECTION TO THE EVAPORATOR . . . . .p.18
4.4 INSTRUCTIONS FOR THE FILLING UP OF THE
TANK AND/OR THE PUMP(S) (IF PRESENT) . . . . . .p.19
4.5 REFRIGERANT CHARGE . . . . . . . . . . . . . . . . . . . . . .p.19
5 ELECTRICAL CONNECTIONS � � � � � � � � � � � �p.21
5.1 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.21
5.2 ELECTRICAL CONNECTIONS OF THE
CIRCULATION PUMP (IF PRESENT). . . . . . . . . . . . .p.21
5.3 REMOTE CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . .p.21
5.4 SUMMER WINTER REMOTE SWITCHING [HEAT
PUMP VERSION] . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.21
6 START-UP � � � � � � � � � � � � � � � � � � � � � � � � � � � �p.22
6.1 PRELIMINARY CHECKS . . . . . . . . . . . . . . . . . . . . . .p.22
6.2 START-UP INSTRUCTIONS . . . . . . . . . . . . . . . . . . . .p.22
6.3 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.23
6.4 INSPECTIONS DURING OPERATION . . . . . . . . . . . .p.23
6.5 REFRIGERANT CHARGE CHECKS . . . . . . . . . . . . . .p.23
6.6 GROUP STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.24
7 OPERATING LIMITS� � � � � � � � � � � � � � � � � � � �p.25
7.1 GLYCOL SOLUTIONS . . . . . . . . . . . . . . . . . . . . . . . . .p.26
7.2 OPERATING LIMITS. . . . . . . . . . . . . . . . . . . . . . . . . .p.26
7.3 WATER FLOW TO THE EVAPORATOR. . . . . . . . . . . .p.26
8 SETTING OPERATING PARAMETERS � � � �p.27
8.1 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.27
8.2 MAXIMUM PRESSURE SWITCH . . . . . . . . . . . . . . . .p.27
8.3 MINIMUM PRESSURE SWITCH. . . . . . . . . . . . . . . . .p.27
8.4 SERVICE THERMOSTAT . . . . . . . . . . . . . . . . . . . . . .p.27
8.5 ANTI-FREEZE THERMOSTAT FUNCTION. . . . . . . . .p.27
8.6 ANTI-RECYCLE TIMER . . . . . . . . . . . . . . . . . . . . . . .p.28
8.7 REFRIGERANT SENSORS (IF “A2L-READY” AND
“R454B” REFRIGERANT OPTIONS PRESENT) . . . . .p.28
9 MAINTENANCE � � � � � � � � � � � � � � � � � � � � � � �p.29
9.1 WARNINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.29
9.2 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.29
9.3 REFRIGERATION CIRCUIT REPAIRS. . . . . . . . . . . . .p.30
9.4 LEAK TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.30
9.5 REFRIGERANT SENSORS MAINTENANCE (ONLY
IF A2L-EADY AND R454B REFRIGERANT OPTIONS
SELECTED). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.30
9.6 EXCHANGE OF SENSOR CARTRIDGE (ONLY IF
R454B REFRIGERANT OPTION SELECTED). . . . . . .p.30
9.7 HIGH VACUUM AND REFRIGERATION CIRCUIT
DRYING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .p.31
9.8 RECHARGINGWITHREFRIGERANTR410A. . . . . . .p.31
10 SUBSTITUTION OF R410A WITH R454B
REFRIGERANT � � � � � � � � � � � � � � � � � � � � � � � �p.32
11 TROUBLESHOOTING � � � � � � � � � � � � � � � � � � �p.33
12 RETIRING THE UNIT � � � � � � � � � � � � � � � � � � �p.34
12.1 WASTE ELECTRICAL AND ELECTRONIC
EQUIPMENT MANAGEMENT. . . . . . . . . . . . . . . . . . .p.34
12.2 ENVIRONMENT PROTECTION . . . . . . . . . . . . . . . . .p.35
12.3 PACKAGING DISPOSAL. . . . . . . . . . . . . . . . . . . . . . .p.35
ENW |User ManUal
5

1 GENERAL DESCRIPTION
1.1 Series
The ENW series of water-condensing chillers includes a
range of models capable of satisfying every need:
• ENW C water-water chillers – cooling only;
• ENW D water-water chillers – dry-cooler cooling;
• ENW H water-water chillers – heat pump;
• ENW W water-water chillers – not reversible heat pump.
1.2 Structure
All ENW units have a galvanised sheet steel supporting
base, coated with epoxy polyester powder paint oven cured
at 180°C. The unit features an exclusive design which lends
it an attractive appearance as well as ensuring that all com-
ponents will be completely inaccessible when the unit is
closed. This characteristic, together with the extensive use
of soundproong material inside the compartment – an op-
tional feature of low-noise models – reduces noise to excep-
tionally low levels [Lp < 66 dB-A @1 metre]. The lumbing/
cooling connections are situated at the top to reduce the
technical spaces required for installation. All panels are re-
movable, thus enabling complete access to all components
of the chiller, though only access from the front is required
for routine servicing.
1.3 Field of Application
The ENW units are designed to cool-heat water and solutions
containing up to 30% glycol (percentage by weight) in civ-
il, industrial and technological air-conditioning systems. In
buildings with large surface areas, the air conditioning sys-
tem can be expanded step by step as new oors or areas are
sold/leased, by installing a ENW unit for every oor in a small
control room. This allows you to spread your investment
over time. The possibility of keeping the evaporator indoors
means there is no need to add glycol to the water inside the
system. In addition, you can keep all components requiring
routine or special maintenance in an easily accessible room.
The pluses offered by these products are summed up in the
following table:
ENW C-D-H-W water-condensing units:
• Occupies an extremely small surface area;
• No need to add glycol to the water in the user circuit;
• High COP [Coecient of Performance] of the thermody-
namic cycle;
• No noise outside;
• Extremely small refrigerant charge;
• Innovative aesthetics and total safety, given that the
chillers are completely enclosed;
• Option of installing an outdoor dry cooler where it is not
possible to use a nonrecirculating water supply to cool
the condenser;
• Heat pump version with cycle reversibility at the cooling
side;
• Condensing control option on the heat pump versions
possible;
ENW C-D-H-W units are to be used within the operating limits
stated in this manual; failure to comply with said limits will
invalidate the warranties provided in the contract of sale.
1.4 Cooling circuit
The entire cooling circuit is built in the manufacturer facto-
ry using only components of the nest quality brands and
processes conforming to the specications of Directive
2014/68/UE for brazing. The chillers are built with a single
cooling circuit using only components supplied by leading
international manufacturers.
Compressors: only scroll-type compressors of leading inter-
national manufacturers are used in the ENW units. The scroll
compressor is presently the best solution in terms of reliabil-
ity and eciency in the range of power up to 182 kW for each
circuit and in terms of noise level.
NOTE: the scroll compressor, like all hermetic compressors,
is classied as a pressure vessel according to the PED inso-
far as its low-pressure section is concerned, to which the PS
indicated on the rating plate refers.
Heat exchangers: all chillers have heat exchangers with
braze-welded AISI 304 austenitic stainless steel plates and
connections made of AISI 304 L, characterised by a reduced
carbon content to facilitate brazing. Braze-welded plate
exchangers represent the state of the art in terms of heat
exchange eciency and make it possible to signicantly
reduce the refrigerant charge compared to traditional solu-
tions. The high turbulence induced by the internal corruga-
tion of the plates combined with their perfectly smooth sur-
face also helps prevent dirt build-up and the formation of
scale on the condenser side.
NOTE: due to the presence of heat insulation, the data plate
is not legible as required under 2014/68/UE PED. However,
the exchanger serial number and declaration of conformity
are recorded during production and constitute an integral
part of records.
Cooling components:
• Molecular mesh activated-alumina lter dryer;
• Flow indicator with humidity indicator. Indications are
provided directly on the sight glass;
• Thermostatic valve with external equalisation and inte-
grated MOP function;
• Thermostatic el. valve with step by step engine and ded-
icated el.driver to obtain the maximum eciency of the
cooling circuit and the best optimization of the function-
ing parameters;
• Reverse cycle valve (heat pump only);
• Unidirectional valve (heat pump only);
• High and low pressure switches;
• Schrader valves for checks, access and/or maintenance;
• Safety valve refrigerating side.
ENW |HF61GJ0632B
6

Electric control board: The electric control board is con-
structed and wired in accordance with Directives 2014/35/
UE and 2014/30/UE and related standards. The board may
be accessed through a door after the main switch has been
put off. All the remote controls use 24 V signals powered
by an insulating transformer situated on the electric control
board. A T control kit comprising a thermostat and an auxil-
iary fan is available on request. The protection rating of the
unit is IP 43.
NOTE: the mechanical safety devices such as the high pres-
sure switch are of the kind that trigger directly; their ecien-
cy will not be affected by any faults occurring in the micro-
processor control circuit. in compliance with 2014/68/UE
PED.
Control microprocessor: the microprocessor built into the
unit allows the different operating parameters to be con-
trolled from a set of pushbuttons situated on the electric
control board:
• Switching on/off of compressor to maintain the temper-
ature set point of the chiller inlet water temperature;
• Alarm management:
- High / low pressure;
- Antifreeze;
- Flow switch;
- Pump alarm;
• Alarm signalling;
• Display of operating parameters;
• Antifreeze protection of evaporator;
• Management of maximum number of compressor start-
ups;
• RS232, RS485 serial output management (optional);
• Phase sequence error [Not displayed by the μP, but pre-
vents the compressor from starting up].
[ref. Microprocessor control manual for further details]
1.5 Models and versions
The ENW series units are available in the liquid chiller ver-
sion (with well/mains water source or drycooler/evaporative
tower), reversible heat pump and only heat pump.
It is possible to choose from different operating noise ver-
sions (Standard, Low Noise versions), and the available
chilling congurations (Eciency packs) allow an extensive
power range to be covered.
All models operates with R410A refrigerant.
The naming methods and the unit conguration options are
shown below.
» Example of unit conguration
1. unit name
2. size (cooling capacity in kW/10, e.g. 012 = 120 kW)
3. eciency packs:
Ū1 = 2 compressors/2 circuits
Ū2 = 2 compressors/1 circuit
Ū3 = 3 compressors/1 circuit
Ū4 = 4 compressors/2 circuits
4. conguration:
ŪC = well or mains water cooled chiller
ŪD = dry-cooler or evaporative tower water cooled chill-
er
ŪH = reversible heat pump
ŪW = not reversible heat pump
5. implementation:
ŪS = standard
ŪL = silenced
ENW
245
3
1
012 1 C L
ENW |User ManUal
7

1.6 Water circuit - only cooling
Cooling only versions (NB: Basic diagram – please refer to the drawing attached to the documentation of the unit)
31
10
23
13
22
35
33
05
02
34
38
12
07 16
15
06
08
20
14
01
05
33
35
22
13
23
10
31
20
04 03
09
37
25
05
06
15
08
16 07
24 24
25
27
OPZIONALE
OPTIONAL
ZUBEHOER
OPTION
OPCIONAL
ДОПОЛНИТЕЛЬНО
28
T
PP
T
P
P
F
1Chilled water inlet 11 Buffer tank 21 Energy-saving coil 31 Safety valve
2Chilled water outlet 12 Evaporator 22 Sight glass 32 Water safety valve
3De-superheater water inlet 13 Filter dryer 23 Shut-off valve 33 Thermostatic valve
4De-superheated water outlet 14 Flow switch 24 Evaporating pressure probe 34 Free-cooling valve
5Charge connection 15 High pressure gauge 25 Condensing pressure probe 35 Solenoid valve
6High pressure switch 16 Low pressure gauge 26 Expansion tank 36 Partialization solenoid valve
7Low pressure switch 17 Fan motor 27 Water inlet temperature sensor 37 Condensing water inlet
8Compressor 18 Chilled water circulation pump 28 Water outlet temperature sensor 38 Condensing water outlet
9Condenser 19 Gate valve 29 Outdoor air temperature sensor 39 4 - way valve
10 De-superheater 20 Crankcase heater 30 Check valve 40 Liquid receiver
------41 Electronic expansion valve
ENW |HF61GJ0632B
8

1.7 Water circuit - reversible heat pump
Reversible Heat pump versions (NB: Basic diagram – please refer to the drawing attached to the documentation of the unit)
38
34
25
39
31
24
07
16
09
37
25
39
31
20
24 16
07
30 30 30 30
41 41
22
13
31 40 30 30 40 31
13
22
14
01 02
12
08
15
06
05
15 05
06
20
08
T
T
F
P
P
T
T
30
30
05
P
P
F
28
28
27
27
1Chilled water inlet 11 Buffer tank 21 Energy-saving coil 31 Safety valve
2Chilled water outlet 12 Evaporator 22 Sight glass 32 Water safety valve
3De-superheater water inlet 13 Filter dryer 23 Shut-off valve 33 Thermostatic valve
4De-superheater water outlet 14 Flow switch 24 Evaporating pressure probe 34 Condensation control valve
5Charge connection 15 High pressure gauge 25 Condensing pressure probe 35 Solenoid valve
6High pressure switch 16 Low pressure gauge 26 Expansion tank 36 Partialization solenoid valve
7Low pressure switch 17 Fan motor 27 Water inlet temperature sensor 37 Condensing water inlet
8Compressor 18 Chilled water circulation pump 28 Water outlet temperature sensor 38 Condensing water outlet
9Condenser 19 Gate valve 29 Outdoor air temperature sensor 39 4 - way valve
10 De-superheater 20 Crankcase heater 30 Check valve 40 Liquid receiver
------41 Electronic expansion valve
ENW |User ManUal
9

2 SAFETY PRESCRIPTIONS
2.1 General safety rules
2.1.1 Thoroughly know the unit
The unit must only be used by qualied personnel, who are
expected to know the arrangement and function of all con-
trols, instruments, indicators, indicator lights and various
data plates.
2.1.2 Wear protective clothing
Each operator must use personal protective equipment such
as gloves, headgear, safety goggles, safety shoes, and hear-
ing protection.
OS
OS
2.1.3 Use safety equipment
A rst aid kit and a re extinguisher must be placed near the
unit.
The extinguisher must always be fully loaded. Use it accord-
ing to the Standards in force.
OS
2.1.4 Warnings for inspections and
maintenance
Display a sign with the warning: “INSPECTION IN PRO-
GRESS” on all sides of the unit.
Check the unit carefully following the list of operations con-
tained in this manual.
INSPECTION
IN PROGRESS
2.2 General precautions
The Machinery Directive 2006/42/EC provides the following
denitions (Annex 1.1.1.1):
DANGER ZONE: any area next to and/or inside a machine,
where the presence of an exposed person constitutes a risk
for the safety and health of said person.
EXPOSED PERSON: any person found entirely or partially
within a danger zone.
OPERATOR: the person (or persons) appointed to install, set
up, adjust, maintain, clean, repair and transport the machine.
CWARNING
• Before carrying out any operation or maintenance on the
unit it is mandatory to read and follow the instructions
given in the use and maintenance manual. During the
actual work, it would be too late: any not recommended
or wrong operation could then cause serious damage to
people or property.
• The employer must inform in detail all operators about
the risks of accidents and particularly about risks related
to noise, required personal protective devices and gener-
al accident prevention rules provided by laws or interna-
tional standards and national standards in the Country of
destination of the unit.
ENW |HF61GJ0632B
10

• All operators must comply with the international acci-
dent prevention standards and standards in force in the
country of destination of the unit.
• Please be reminded that the European Union has issued
some directives concerning the safety and health of work-
ers, among which the directives 89/391/EEC, 89/686/
EEC, 89/654/EEC, 2009/104/EC, 89/656/EEC, 2003/10/
EC, 92/58/EEC and 92/57/EEC that each employer has an
obligation to observe and to enforce. In the event that the
unit is installed outside the European union, always refer
to the regulations in force in the country of installation.
• Before starting any work on the unit, each operator must
be perfectly familiar with its operation and its controls,
and have read and understood all the information con-
tained in this manual.
BATTENTION
It is forbidden to tamper with or replace parts of the unit un-
less this has been expressly authorised by the MANUFAC-
TURER.
The use of accessories, tools, consumables or spare parts
other than those recommended by the MANUFACTURER
and/or specied in this manual may be a hazard to operators
and/or damage the unit.
Any alteration of the unit not expressly authorised by the
MANUFACTURER shall not imply any civil or criminal liability
for the manufacturing company.
CWARNING
• It is strictly forbidden to remove or tamper with any safe-
ty devices.
• Any installation, ordinary and extraordinary maintenance
operations must be carried out with the unit stopped and
without power supply.
• Once the unit has been cleaned, the operator must check
that there are no worn or damaged parts or parts that are
not safely xed, or if this is the case, ask the maintenance
staff to x the problem.
• Special attention must be paid to the state of repair of
the pressurised pipes or other parts exposed to wear. It
must also be ensured that there are no leaks of uid, or
other dangerous substances.
• In these cases, it is forbidden for the operator to restart
the unit before the situation has been remedied.
• If any of these occurrences are detected, the operator,
before leaving the unit unattended, must display a warn-
ing sign indicating that maintenance is in progress and it
is forbidden to start the unit.
• The use of ammable uids in cleaning operations is
prohibited.
• Periodically check the condition of the data plates and
arrange, if necessary, for them to be restored.
• The operator work place must be kept clean, tidy and
free from any objects that may limit unhindered move-
ment.
• Operators should avoid operating the device from un-
safe, uncomfortable positions that may affect their bal-
ance.
• Operators must be aware of possible risks of entrap-
ment and entanglement of clothes and/or hair in moving
parts; it is recommended to wear caps over long hair.
• Wearing chains, bracelets and rings can also be danger-
ous.
• The workplace must be adequately lit for the intended
operations. Insucient or excessively bright lighting can
imply safety risks.
• Ensure adequate ventilation to the installation room to
protect against any refrigerant leaks.
• The instructions, accident-prevention rules and warnings
contained in this manual must be observed at all times.
2.2.1 Safety information
The units have been designed and built according to the cur-
rent state of the art and the technical rules currently appli-
cable to uid chillers and heat pumps intended for cooling
water or water and anti-freezing agent mixtures, for housing
air conditioning and industrial cooling systems. Compliance
with the laws, provisions, prescriptions, orders and direc-
tives in force for these machines has been ensured.
The materials and the equipment parts used, as well as the
production, quality assurance and control processes meet
the highest safety and reliability requirements.
By using them for the purposes specied in this user man-
ual, by operating them with the required diligence and per-
forming accurate maintenance and overhauling in a work-
manlike manner, consistent performance and functionality
and durability can be ensured.
2.2.2 Accident prevention
The MANUFACTURER cannot be held liable for accidents
caused when using the unit, due to the user not complying
with laws, provisions, regulations and standards in force re-
garding uid chillers and heat pumps.
2.2.3 Operational safety
The MANUFACTURER will not be responsible in case of mal-
functions and damage if the unit:
• it is used for purposes other than those for which it is
intended;
• it is not operated and maintained according to the ser-
vice standards specied further on in this manual;
• it does not regularly and consistently receive mainte-
nance as prescribed or non-original spare parts are used;
• is modied or some components are replaced without
the MANUFACTURER’s written authorisation, especially
when the effectiveness of the safety systems has been
altered or minimised on purpose;
• it is used outside the permissible temperature range.
2.2.4 Residual risk areas
ADANGER
In some areas of the unit there are some residual risks that
could not be eliminated during the design phase nor isolated
with guards due to the unit’s operating characteristics. Each
operator must be aware of the residual risks present in this
unit in order to prevent any accidents.
ENW |User ManUal
11

2.3 Location of safety data
plates
2.3.1 Description of the safety symbols
1
A. Warning: danger due to poor familiarity with all the functions of the unit and the
resulting risks.
B. Read the use and maintenance manual carefully before operating the unit.
A B
2
Electric power supply data plate +
3
A. Danger: hot parts.
B. Danger: live parts.
C. Danger of burns.
D. Danger of cutting injuries in the nned exchangers area.
AB
CD
4
Anchor points for lifting
5
Refrigerating liquid (example) R410AR454B
2.4 Maintenance precautions
2.4.1 Tools
Personal injury is prevented by not using worn or damaged,
low quality or makeshift tools.
BATTENTION
If tools not recommended or modied without authorisation
are used, the manufacturer will no longer be liable for dam-
ages caused.
2.4.2 Personnel
Ordinary maintenance prescribed in this manual must only
be performed by authorised and trained personnel.
For the maintenance or overhauling of components not
specied in this manual, contact the MANUFACTURER.
2.4.3 Keep the unit clean
Oil and grease stains, misplaced tools or broken pieces are
harmful to people as they can cause slipping or falls. Always
keep the area where the unit is installed clean and tidy.
Do not use diesel fuel, oil or solvents to clean the unit as the
rst two leave an oily lm that makes it easier for dust to
stick, while solvents (even milder ones) damage the paint
nish and cause rusting.
If a water jet hits the inside of electrical equipment, in addi-
tion to causing contact oxidation, it may cause the unit mal-
function.
For this reason, do not use water or steam jets on sensors,
connectors or any electrical parts.
2.4.4 Care and maintenance
The cause of damages and accidents is often attributable to
wrong maintenance, such as:
• no water in the circuit;
ENW |HF61GJ0632B
12

• incorrect percentage of anti-freezing agent in the hy-
draulic circuit;
• inadequate refrigerant;
• poor cleaning in the unit setting;
• circuit ineciency (damage to the exchangers, pipe con-
nections, tightening of pipes, screws, etc.).
Carry out maintenance work as required: this is also critical
for your own safety.
Never postpone scheduled repairs.
Only assign skilled or authorised personnel to repair tasks.
Always observe the following safety rules, even when you
are thoroughly familiar with the operations involved:
• always keep the unit and the surrounding area clean;
• before beginning to work, check the perfect eciency of
protective devices;
• make sure that no unqualied or not specially appointed
persons enter the unit operating area.
2.5 Precautions in case of
refrigerant leakage
In case the unit is charged with an A2L classied refriger-
ant, (low ammable refrigerant), the unit is provided with one
refrigerant leakage sensor inside each compressor box (if
present) and inside all separated sections of the electrical
box.
The following safety chain is applied: EVENT - ACTION - SIG-
NAL
Each sensor is set on two different concentration thresh-
olds. The threshold is depending on refrigerant type, and list-
ed in the table below:
Refrigerant Classication Low level threshold High level threshold
R454B A2L 900 ppm 1800 ppm
The following image and table describe the safety chain
EVENT - ACTION - SIGNAL
Critical alarm Sensor high level alarm, sensor breakdown
Warning signal Sensor low level alarm, air pressure switch alarm/breakdown, compressor box/auxiliary box fan breakdown
11111
7
8
9
10
6
5
4
3
2
11111
7
8
9
10
6
5
4
3
2
11111
7
8
9
10
6
5
4
3
2
11111
7
8
9
10
6
5
4
3
2
COMPRESSOR BOXELECTRICAL BOX
CRITICAL ALARM
WARNING SIGNAL
EVENT ACTION SIGNAL
Compressor box fan alarm fault Electrical box fans activation (when Tair <= T limit) Dedicated warning signal
Underpressure inside electrical panel alarm/fault Compressor box fans activation Dedicated warning signal
Low level alarm Compressor box fans activation
Electrical box fans activation (when Tair <= T limit) Dedicated warning signal
Refrigerant sensor fault Switch off all the unit (electrical supply still present) General serious alarm + Dedicated serious alarm
High level alarm Switch off all the unit (electrical supply still present) General serious alarm + Dedicated serious alarm
ADANGER
Refrigerant safety devices are not active when the unit is not
powered: risk of refrigerant presence in the electrical pan-
el. Check any refrigerant leaks with a suitable device before
starting the unit.
CWARNING
Follow the instructions below in the event of a refrigerant
leak signal from the sensors installed on the machine or
possibly present near the machine:
ŪIn case of low level alarm, contact technical support.
ŪDo not stand in the vicinity of the machine.
ENW |User ManUal
13

It is necessary to have a remote refrigerant alarm signal, so
that it is not necessary to approach the machine in the event
of an alarm. This remote signal can be performed:
ŪVia remote display, available as an option and available
at any time by contacting the After-sales service.
ŪBy reading the unit alarms via remote communication
(e.g. via Modbus or Ethernet) and by remotely setting up
a specic danger signal far from the unit to activate in
the event of an alarm.
BATTENTION
In case of serious alarm:
ŪRemove voltage from the unit, keeping the dedicated
alarm signal via wired contact active (see wiring dia-
gram).
ŪCall a service centre for assistance.
Technical assistance must:
ŪWell ventilate all the closed compartments of the ma-
chine well for at least 5 minutes, before energizing.
ŪCheck the cooling circuit for leaks.
ŪOnce the circuit is set up and the refrigerant charge is re-
stored, close the compartments and power up the chiller,
if there are no alarms, the machine can be restarted.

ADANGER
The safety of the installation environment outside unit
boundaries is entrusted to the technical manager of teh sys-
tem.
The installation site must comply with the design require-
ments of EN378-1. If classied as a “machinery room” or in
any case “closed environment” according to the denition of
the legislation, the following points must be respected:
ŪEnsure the quality and minimum quantity of ventilation
air to the machine, for example by installing a leak detec-
tor to monitor the presence of ammable gas in air. In the
event that the concentration of the refrigerant exceeds
25% of the LFL (low ammability limit), an alarm must
be activated together with mechanical ventilation and
system shutdown;
ŪInstallation of an emergency ventilation system which
is activated in the event of leakage detection inside the
room; if the fan is on suction side, it must comply with
the requirements for installation in areas at risk of re;
ŪAvoid any contact between the refrigerant and surfaces
that exceed 80% of its auto-ignition temperature.
ENW |HF61GJ0632B
14

3 PRELIMINARY PROCEDURES
3.1 Transport
In order not to damage the structure and components, the
units ENW must be xed to the transport vehicle using the
supports shown in the following gure. The image on the left
refers to cases including accessories.
OS
3.2 Inspection on receipt
Upon receiving the unit, check its integrity: the machine has
left the factory in perfect condition; any damage must be im-
mediately reported to the forwarder and noted on the Deliv-
ery report before signing it.
The manufacturers or their agents must be informed as soon
as possible about the extent of the damage. The Customer
must submit a written report for any signicant damage.
Upon receiving the unit, check its integrity: the machine has
left the factory in perfect condition; any damage must be im-
mediately reported to the forwarder and noted on the Deliv-
ery report before signing it.
The manufacturer or its agent must be promptly notied of
the extent of the damage.
The Customer must submit a written report describing any
signicant damage.
3.3 Conveyance
During the unloading and positioning of the unit, be extreme-
ly careful to avoid bumps and knocks or sudden movements.
Handling must be carried out carefully and gently, avoiding
to apply pressure to any machine components.
The unit shall be lifted using seamless pipes - ref. EN10255
S195T - in steel Ø1½” GAS at least 3 mm thick inserted into
the round holes provided in the base rails (a) and marked
with the special stickers.
a
a
The pipes that must protrude by at least 300 mm from each
end will be harnessed with identical ropes, secured to the
lifting hook (provide fasteners at the ends of the pipes in or-
der to avoid that, due to the applied weight, the rope slips off
the pipe).
ENW |User ManUal
15

A. Hole on the basement
B. Lifting tube without welding Ø 1½” - S195T
C. Safety bolt
D. Locking nut
E. Rope - belt
A
CB
D
E
Use ropes or belts of adequate length and strength and
spacer bars to avoid damaging the sides and top of the unit.
Vertex Angle
(°) 010 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
Load increase
factor 11.004 1.015 1.035 1.064 1.103 1.155 1.221 1.305 1.414 1.556 1.743 2.000 2.336 2.924 3.864 5.759 11.474
BATTENTION
During all lifting operations make sure the unit is rmly an-
chored, to prevent it from tilting or falling.
BATTENTION
The use of tie rods having a vertex angle with respect to the
vertical line greater than 60° is not recommended; beyond
this limit, the capacity of the tie rod varies considerably for
each small change in the angle or according to general con-
ditions of use.
ENW |HF61GJ0632B
16

3.4 Unpacking
The unit packaging must be carefully removed avoiding pos-
sible damage to the machine; the materials that make up the
packaging are of a different kinds: wood, cardboard, nylon,
etc.
It is good practice to collect them separately and deliver
them for disposal or recycling to specialised disposal com-
panies - thus reducing their environmental impact.
3.5 Siting
Check the following points to select the best installation set-
ting for the unit and its connections:
• size and origin of water pipes;
• location of power supply;
• accessibility for maintenance or repairs;
• solidity of the supporting surface.
All models belonging to the ENW series are designed and
built for indoor installation. As special care has been taken
in the sound insulation and sealing of the components and
hot parts in general, they need not be installed in dedicated
rooms.
BATTENTION
It is advisable to place a rigid rubber strip between the base
frame and the supporting surface.
ENW |User ManUal
17

4 INSTALLATION
4.1 Installation clearance
requirements
In the case of units with a remote condenser, the plumbing
and cooling connections are provided on the top of the unit.
This allows the chiller to be placed practically against the
rear wall. It is nonetheless of fundamental importance to as-
sure the following service spaces:
• back side: min. 0 metres (except the 2 last sizes)
• electric control board side: min. 1.0 metre to guarantee
access for inspection and/or maintenance of cooling
components
• lateral part: min. 0.5 metre for extraordinary mainte-
nance
• top side: min. 1.0 metre for adequate connection to the
external hydraulic and cooling piping
0 m
1 m
0.5 m0.5 m
4.2 General guidelines for
plumbing connections
When you are getting ready to set up the water circuit for
the evaporator you should follow the directions below and
in any case make sure you comply with national or local reg-
ulations (use the diagrams included in this manual as your
reference).
BATTENTION
Connect the pipes to the chiller using exible couplings to
prevent the transmission of vibrations and to compensate
thermal expansions. For the types and size of the water and
cooling connections (versions with remote condenser only)
refer to the table of technical data.
Install the following components on the piping:
• temperature and pressure indicators for routine mainte-
nance and monitoring of the unit. Checking the pressure
on the water side will enable you to verify whether the ex-
pansion tank is working eciently and to promptly detect
any water leaks within the equipment;
• traps on incoming and outgoing pipes for temperature
measurements, which can provide a direct reading of the
operating temperatures. Temperature readings can in any
case be obtained from the microprocessor installed on
the unit;
• regulating valves (gate valves) for isolating the unit from
the water circuit during maintenance work;
• metal mesh lter (incoming pipes), with a mesh not to
exceed 1 mm, to protect the exchanger from scale or im-
purities present in the pipes. This prescription is particu-
larly important at rst start-up;
• air vent valves, to be placed at the highest points of the
water circuit for the purpose of bleeding air. [The inter-
nal pipes of the unit are tted with small manual air vent
valves for bleeding the unit itself: this operation may only
be carried out when the unit is disconnected from the
power supply];
• drainage valve and, where necessary, a drainage tank for
emptying out the equipment for maintenance purposes
or when the unit is taken out of service at the end of the
season.
4.3 Water connection to the
evaporator
CWARNING
All ENW units are not provided with an internal water group, but it
will be installed on the outside of the unit.
BATTENTION
It is critically important that water inlet occurs at the connec-
tion marked with the words “Water Inlet”.
Otherwise the evaporator would be exposed to the risk of
freezing since the antifreeze thermostat would not be able
to perform its function; moreover the reverse cycle would
not be respected in the cooling mode, resulting in additional
risks of malfunctioning. This position does not enable the
operation of the water ow control device.
The dimensions and position of plumbing connections are
shown in the dimension tables at the end of the manual.
CWARNING
The water circuit must be set up in such a way as to guarantee
that the nominal ow rate of the water supplied to the evaporator
remains constant (+/- 15%) in all operating conditions.
The compressors work intermittently, since the chilling re-
quirements of the user generally do not coincide with the
compressor output. In systems containing little water, where
the thermal inertia of the water is lower, it is a good idea to
check that the water content in the section delivering to us-
ers satises the condition below:
ENW |HF61GJ0632B
18

Vwater content in the user section [m3]
Sh uidspecicheat[J/(kg/°C)]
ρ uiddensity[kg/m3]
Δτ minimum time between 2 restarts of the compressors [s]
ΔT permitted waterT differential [°C]
Cc refrigerating power [W]
Ns No. of partial loading steps
V = Cc x ∆τ
ρ x Sh x ∆T x Ns
The following gure shows the integrated and balanced ef-
fect of the storage tank. Its function helps ensure accurate
temperature control according to the environmental param-
eters of the connected groups.
T1 Inlet waterT
T2 Outlet waterT
Ainertial tank
Inlet water T Outlet water T
Buer
tank
BATTENTION
A standard feature of ENW units is a device for controlling
the ow rate (ow switch or differential pressure switch) in
the water circuit in the immediate vicinity of the evaporator.
BATTENTION
Any tampering with said device will immediately invalidate
the warranty.
BATTENTION
It is advisable to install a metal mesh lter on the inlet water
pipe.
BATTENTION
When making the plumbing connections, make sure there
are no open ames in proximity to or inside the unit.
4.4 Instructions for the filling
up of the tank and/or the
pump(s) (if present)
BATTENTION
The tank is not planned to resist to a depression greater than
-0,15 Bar, so pay attention to the fact that the suction pres-
sure of the pump, where the expansion tank is positioned,
has to be always greater than 0,5 Bar with the pump in oper-
ation: this fact also contributes to reduce any risks concern-
ing the cavitation of the pump.
It is of fundamental importance for the installer to follow and
check the instructions written below stepwise, so as to avoid
every kind of risks concerning the implosion of the tank or
the cavitation of the pump:
A. Empty the expansion tank until the pressure is 0,5 Bar;
B. Charge the system and pressurize it until about + 1 Bar in
suction, pump side (with pump not working);
C. Allow air to escape from the system;
D. Check the suction pressure of the pump (about 1 Bar)
and start the system;
E. Stop the pump after 15-30 minutes and repeat from point
c) until there are no more noises caused by air in the sys-
tem.
4.5 Refrigerant charge
ADANGER
Before carrying out any operation with the refrigerant, it is
recommended to read the special safety data sheet (MSDS).
The refrigerants used in the entire ENW product range are
R410A R454B.
These have the following characteristics:
ŪTOXICITY, the refrigerants mentioned above all belong
to group A according to the standard 34 ASHRAE; this
group includes all refrigerants that are found not toxic for
concentrations equal to or lower than 400 ppm.
ŪFLAMMABILITY, according to the standard 34 ASHRAE,
refrigerant R-410A is classied in the safety group A1,
i.e. non-ammable at a pressure of 1 atm (101.3 kPa)
and 18°C. R-454B is classied in the A2L safety group,
i.e. mildly ammable at 1 atm pressure (101.3 kPa) and
18°C.
ŪCATEGORY, the refrigerants used are uids of category
II according to the PED 2014/68/EU directive and there-
fore, they are not dangerous.
In the event of substantial refrigerant vapour release, the ar-
ea must be immediately evacuated. Vapour concentration is
higher at oor level, limiting the availability of oxygen. After
evacuation, it is necessary to ventilate the area with fans or
blowers to ensure air circulation at oor level.
For loading operations, follow the procedure described be-
low:
Ūconnect the refrigerant gas cylinder to the 1/4 SAE male
ller outlet located on the liquid line, making sure that
there are no impurities, moisture and/or incondensable
gases in the inlet pipes;
Ūload liquid state charge until 75% of the total charge has
been introduced;
Ūthen connect to the intake on the suction line and com-
plete liquid charge loading until no more bubbles appear
on the liquid viewer and the operating values are reached
that are indicated in the paragraph6.5Refrigerant charge
checksp.23.
BATTENTION
A unit originally lled at the factory with a refrigerant type
cannot be lled with different refrigerants without a written
permission from manufacturer.
ENW |User ManUal
19

BATTENTION
If the (mildly ammable) R454B is used, it is recommend-
ed to provide all the safety devices required by law during
installation. In case of indoor installation, contact the man-
ufacturer.
BATTENTION
Refer to paragraph 12.2 Environment protection  p. 35
contained in this document.
ENW |HF61GJ0632B
20