Accorroni HPE 25 Manual

TECHNICAL INFORMATION
HPE 25÷70 - HPE LT 25÷50 INVERTER
Air / water inverter heat pumps
with axial fans and steam injection versions
HPE 25÷70 - HPE LT 25÷50
INVERTER

2
CE CONFORMITY DECLARATION
DICHIARAZIONE DICONFORMITÁ CE
The company A2B ACCORRONI E.G.– Via Ancona, 37 – Osimo (AN) - Italy
DECLARES
that the unit :
che la macchina
Definition :
Definizione :
Industrial inverter air/water heat pump with axial fan / Pompa di
calore industriale aria/acqua inverter con ventilatore assiale
Industrial inverter air/water heat pump with vapour injection and
axial fan / Pompa di calore industriale aria/acqua inverter con
iniezione di vapore e ventilatore assiale
Model N°:
N° modello:
HPE INVERTER 25/35/50/50F/60/70
HPE INVERTER LT 25/35/50
Serie N°:
N° di serie:
MEETS THE REQUIREMENTS OF DIRECTIVE 2006/42/CE
È CONFORME AI REQUISITI DELLA DIRETTIVA 2006/42/CE
1. The unit is in CAT. I, so it’s free from the application of Directive 2014/68/UE (Reference to Art. I, paragraph 2, point f)
L’attrezzatura a pressione rientra nella CAT. I. L’unità è quindi esente dall’applicazione della normativa PED 2014/68/UE (Riferimento Art. I, paragrafo 2 punto f).
2. Harmonized standards applied to designing and manufacture: UNI EN 378-1, UNI EN378-2, UNI EN 12735-1
Norme armonizzate applicate alla progettazione ed alla costruzione: UNI EN 378-1, UNI EN378-2, UNI EN 12735-1
3. Others European Directives and harmonized standards applied to the equipment: 2014/35/UE, 2014/30/UE, 2011/65/UE, 2012/19/UE, CEI EN 60204-1, UNI EN
ISO 12100, UNI EN ISO 13857, CEI EN 61000-6-3, CEI EN 61000-6-2
Eventuali altre Direttive Europee e norme armonizzate applicate all’attrezzatura: 2014/35/UE, 2014/30/UE, 2011/65/UE, 2012/19/UE, CEI EN 60204-1, UNI EN ISO
12100, UNI EN ISO 13857, CEI EN 61000-6-3, CEI EN 61000-6-2
Osimo,Settembre/September 2018
A2B ACCORRONI E.G.

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INDEX
1PURPOSES AND CONTENTS OF THE MANUAL......................................................................................................................... 5
1.1 CONSERVATION OF THE MANUAL.......................................................................................................................................... 5
1.2 GRAPHIC SYMBOLS................................................................................................................................................................. 5
2SAFETY LAWS ......................................................................................................................................................................... 5
3PERMITTED USES ................................................................................................................................................................... 5
4GENERAL SAFETY GUIDELINES................................................................................................................................................ 6
4.1 WORKERS’ HEALTH AND SAFETY ............................................................................................................................................ 6
4.2 PERSONAL SAFETY EQUIPMENTS ........................................................................................................................................... 6
4.3 SAFETY SYMBOLS ................................................................................................................................................................... 6
4.4 REFRIGERANT SAFETY DATA SHEET........................................................................................................................................ 7
5TECHNICAL CHARACTERISTICS................................................................................................................................................ 8
5.1 FRAME.................................................................................................................................................................................... 8
5.2 REFRIGERANT CIRCUIT ........................................................................................................................................................... 8
5.3 COMPRESSORS....................................................................................................................................................................... 8
5.4 AIR-SIDE EXCHANGER............................................................................................................................................................. 8
5.5 FAN MOTOR ........................................................................................................................................................................... 8
5.6 USER-SIDE HEAT EXCHANGER ................................................................................................................................................ 8
5.7 ELECTRICAL CONTROL PANEL................................................................................................................................................. 8
5.8 CONTROL SYSTEM .................................................................................................................................................................. 8
5.9 CONTROL AND PROTECTIONDEVICES.................................................................................................................................... 8
5.10 HYDRAULIC CIRCUIT ............................................................................................................................................................... 9
5.11 FAN SPEED CONTROL ............................................................................................................................................................. 9
5.12 ENHANCED VAPOUR INJECTION (EVI) TECNOLOGY................................................................................................................ 9
6AVAILABLE VERSIONS WITH SIZES AND ACCESSORIES.......................................................................................................... 10
6.1 OPTIONAL ACCESSORIES ...................................................................................................................................................... 12
7INSTALLATION...................................................................................................................................................................... 13
7.1 GENERALITY ......................................................................................................................................................................... 13
7.2 LIFTING AND HANDLING....................................................................................................................................................... 14
7.3 LOCATION AND MINIMUM TECHNICAL CLEARANCES .......................................................................................................... 14
7.4 DIMENSIONS ........................................................................................................................................................................ 15
7.5 HYDRAULIC CONNECTIONS .................................................................................................................................................. 15
7.5.1 Characteristics of water of the plant circuit ................................................................................................................. 16
7.5.2 Hydraulic circuit type.................................................................................................................................................... 16
7.5.3 Handbook ..................................................................................................................................................................... 17
7.5.4 Hydraulic circuit............................................................................................................................................................ 17
7.5.5 Drainage connection .................................................................................................................................................... 17
7.5.6 Plant circuit loading...................................................................................................................................................... 17
7.5.7 Plant drainage system.................................................................................................................................................. 17
7.6 REFRIGERANT DIAGRAMS .................................................................................................................................................... 18
7.6.1 Refrigerant diagram of HPEINV.25 and HPE 35 models ............................................................................................ 18
7.6.2 Refrigerant circuit ofHPE INV.50 model ...................................................................................................................... 18
7.6.3 Refrigerant diagram of the model HPE 50, HPE 60 and HPE 70 ................................................................................... 19
7.6.4 Refrigerant circuit ofHPE 50F model ........................................................................................................................... 19
7.6.5 Refrigerant circuit of i-HP-LT 0125 model .................................................................................................................... 20
7.6.6 Refrigerant diagram of “HPE LT 35” and “ HPE LT 50” models .................................................................................... 20
7.7 ELECTRICAL CONNECTIONS.................................................................................................................................................. 20
7.7.1 Access to the electrical panel ....................................................................................................................................... 21
7.7.2 Power supply’s terminal block...................................................................................................................................... 23
7.7.3 User’s terminal block.................................................................................................................................................... 24
7.7.4 PM Module phase protection ....................................................................................................................................... 24
7.7.5 Plant management optional module terminal block.................................................................................................... 24
7.7.6 CONTROL LOGICS.......................................................................................................................................................... 25
7.7.7 Wiring diagrams........................................................................................................................................................... 25
8START UP ............................................................................................................................................................................. 25

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8.1 POWER-ON OF THE UNIT ..................................................................................................................................................... 26
9INDICATIONS FOR THE USER.................................................................................................................................................26
10 SHUTDOWNS FOR LONG PERIODS ....................................................................................................................................26
11 MAINTENANCE AND PERIODICAL CONTROLS....................................................................................................................26
11.1 CLEANING OF THE FINNED CONDENSER .............................................................................................................................. 27
11.2 EXTRAORDINARY MAINTENANCE ........................................................................................................................................ 27
11.3 ENVIRONMENTAL PROTECTION........................................................................................................................................... 27
12 DISPOSAL OF THE UNIT .....................................................................................................................................................27
12.1 RESIDUAL RISKS ........................................................................................................................................................................ 28
13 TECHNICAL DATA ..............................................................................................................................................................29
13.1 STANDARD VERSION ............................................................................................................................................................ 29
13.2 LT VERSION .......................................................................................................................................................................... 31
14 ELECTRIC DATA OF THE UNIT AND AUXILIARIES ................................................................................................................32
15 AVAILABLE HEAD PRESSURE OF THE UNIT WITH INTEGRATED CIRCULATOR .....................................................................32
16 CIRCULATOR’S CURVES .....................................................................................................................................................33
16.1 MODELS HPE25 -35 ............................................................................................................................................................ 33
16.2 MODEL HPE50 -50F............................................................................................................................................................ 33
16.3 MODEL HPE60 ..................................................................................................................................................................... 34
16.4 MOD. HPE60 &HPE70 ........................................................................................................................................................ 34
16.5 CIRCULATOR CHARACTERISTICS........................................................................................................................................... 34
17 HEAD LOSS CURVES OF THE HYDRONIC CIRCUIT ...............................................................................................................34
18 CHARACTERISTIC CURVE OF THE CONTROL VALVE FOR UNIT IN PARALLEL .......................................................................35
19 ACCESSORIES TO REDUCE THE NOISE LEVEL......................................................................................................................35
19.1 SL.......................................................................................................................................................................................... 35
19.2 SSL........................................................................................................................................................................................ 36
20 OPERATING LIMITS ...........................................................................................................................................................36
20.1 EVAPORATOR WATER FLOW RATE....................................................................................................................................... 36
20.2 COLD WATER TEMPERATURE (SUMMER OPERATION) ........................................................................................................ 36
20.3 HOT WATER TEMPERATURE (WINTEROPERATION) ............................................................................................................ 36
20.4 AMBIENT AIR TEMPERATURE............................................................................................................................................... 37
21 CORRECTION FACTORS FOR USE OF GLYCOL .....................................................................................................................38

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The manualof “HPE INVERTER” units collects all the necessary information for the better useofthe appliance underthe
operator’s safety conditions which meets the requirements listed inthe 2006/42/CE Equipment Directive and following
amendments.
1PURPOSES AND CONTENTS OF THE MANUAL
This manual provides the basic information as for the selection, installation, operation and maintenance ofi-HPunits. It
isaddressed to the installer and the user ofthe appliance and it includes the necessary indications allowing the user to operate
the unit efficiently, even without any previous specific knowledge of it.
The manual describes the characteristics of the appliance at the time of its marketing;therefore, it must be considered adequate
respecting the state of the art interms ofpotentiality, ergonomics, safety and functionality.
The company introduces also technological improvements and is notconstrained to update the manuals for previous versions
ofappliances that could not becompatible. So make sure to use, for the installed unit, the supplied manual.
It’s recommended that, the user must follow the instructions contained in this booklet, especially those concerning the safety and
routine maintenance.
1.1 CONSERVATION OFTHE MANUAL
The manual has to be always kept for future reference.Ithas to be stored ina safe place, away from dusts and moisture. It has to
be also available andaccessible toall users who shall consult itany time they are in doubt on how tooperate the equipment. The
company reserves the right tomodify its products and related manuals without necessarily updating previous versions ofthe
reference material. Itdeclines also any responsibility for possible inaccuracies inthe manual ifdue toprinting or transcription
errors.
The customer must keep any updated copy of the manual orparts of it delivered bythe manufacturer asanattachment tothis
manual.
The company is available togive any detailed information about this manual and to give information regarding the use and
the maintenance ofits own units.
1.2 GRAPHIC SYMBOLS
Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.
Indicates prohibited operations.
Indicates important information that the operator has to follow in order to guarantee the correct operation of the
equipment in complete safety.
2SAFETY LAWS
The units have been designed in accordance with the following directives and harmonised standards:
•EU Directives 2014/68/UE, 2006/42/EC, 2014/35/UE, 2014/30/EU, 2011/65/EU, 2012/19/EU
•UNI EN 378-1, 378-2, EN 12735-1
•UNI EN ISO 12100, EN 60204-1, UNI EN ISO 13857
•CEI EN 61000-6-3, IEC 61000-6-2.
3PERMITTED USES
•The company excludes any contractual and extra-contractual liabilities for damages caused to persons, animals or objects, by
incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the
information contained in this manual.
•These units have been designed only for heating and/or cooling of water. Any other use not expressly authorized by the
manufacturer is considered improper and therefore not allowed.
•The location of the plant, the hydraulic and electrical circuits must be established by the planting designer and must take into
account both technical requirements as well as any applicable local laws and authorized specifications.
•The execution of all works must be performed by skilled and qualified personnel, competent in the existing rules in different
countries.
The execution of all works must be performed by skilled and qualified personnel and competent in the existing rules in the
country in which the appliance will be installed.

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4GENERAL SAFETY GUIDELINES
Before beginning tooperate on HPE units every user hastobe perfectly knowledgeable about the functions ofthe equipment
and its controls and has tohave read and understood the information listed in this manual.
It’s strictly forbidden to remove and/or tamper with any safety device.
Children or unassisted disabled persons are not allowed to use the appliance.
Do not touch the appliance when barefoot or parts of the body are wet or damp.
Do not clean the unit when the power supply is ‘ON’.
Do not pull, remove or twist the electrical cables coming out from the unit, even if it is disconnected from the main
power supply.
Do not step with your feet on the appliance, sit down and/or place any type of object.
Do not spray or pour water directly on the unit.
Do not dispose of, abandon or leave within reach of children packaging materials (cardboard, staples, plastic bags,
etc.) as they may represent an environmental and life hazard.
Any routine and/or not-routine maintenance operation shall be carried out when the equipment has been shut down,
disconnected from electric and pneumatic power sources and after its pneumatic system has been discharged.
Do not put neither your hands nor insert screwdrivers, spanners or other tools into moving parts of the equipment.
The equipment supervisor and the maintenance man have to receive suitable training for the performance of their
tasks in safety.
Operators have to know how to use personal protective devices and have to know the accident-prevention guidelines
contained in national and international laws and norms.
4.1 WORKERS’ HEALTH AND SAFETY
The European Community has adopted a number of directives on workplace’s health and safety, including 89/391/CEE,
89/686/CEE, 89/655/CEE, 2009/104/CE, 86/188/CEE and 77/576/CEE directives. Every employer shall implement such norms and
ensure that workers to respect them. It points out that:
Do not tamper with or replace parts of the equipment without the specific consent of the manufacturer. The
manufacturer shall have no responsibility whatsoever in case of unauthorised operations.
Using components, expendable materials or spare parts that do not correspond to those recommended by the
manufacturer and/or listed in this manual may be dangerous for the operators and/or damage the equipment
The operator’s workplace has to be kept clean, tidy and free from objects that may prevent free movements.
Appropriate lighting of the work place shall be provided so as to allow the operator to carry out the required
operations safely. Poor or too strong lighting can cause risks.
Ensure that work places are always adequately ventilated and that aspirators are working, in good condition and in
compliance with the requirements of the laws in force.
4.2 PERSONAL SAFETY EQUIPMENTS
When operating and maintaining the “HPE” units, use the following personal protective equipment.
Protective clothing: Maintenance man and operators have to wear protective clothing that complies with the basic
safety requirements currently in force. In case of slippery floors, users have to wear safety shoes with non-slip soles.
Gloves: During maintenance or cleaning operation protection gloves have to be used
Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during
cleaning and maintenance operations.
4.3 SAFETY SYMBOLS
The unit features the following safety signs, which has to be complied with:
General hazards
Electric shock hazard
Presence of moving organs
Presence of surfaces that may cause injures
Presence of hot surfaces that can cause burns

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4.4 REFRIGERANT SAFETY DATA SHEET
Name:
R410A (50% Difluoromethane (R32); 50% Pentafluoroethane (R125).
RISKS INDICATIONS
Major risks:
Asphyxia
Specific risks:
The rapid evaporation may cause freezing.
FIRST AID
General information:
Never give anything by mouth to an unconscious person.
Inhalation:
Move to fresh air.
Oxygen or artificial respiration if necessary.
Do not administer adrenaline or similar drugs.
Eyes contact:
Rinse carefully with water for at least 15 minutes and consult a doctor.
Contact with skin:
Wash immediately with plenty of water.
Take off immediately the contaminated clothing.
FIRE PREVENTION
Extinguishing Media:
Whatever.
Specific risks:
Increase in pressure.
Specific methods:
Use water spray to cool containers
ACCIDENTAL RELEASE ACTIONS
Personal precautions:
Evacuate personnel to safe areas.
Provide adequate ventilation.
Use personal protective equipment.
Environmental
Evaporate.
Cleaning method:
Evaporate.
HANDLING AND STORAGE
Manipulation
Action/technical
Provide sufficient air exchange and/or suction in work places.
Recommendations for safe
Do not breathe vapors or aerosol.
Storage:
Close tightly and store in a cool, dry and well ventilated place.
Store in original container. Incompatible products: explosive, flammable materials, Organic
peroxide.
EXPOSURE CONTROL / PERSONAL PROTECTION
Control parameters:
AEL (8-h e 12-h TWA) = 1000 ml/m³ for each of the two components.
Respiratory protection:
For rescue and maintenance operation in storage tanks use self-contained respirator
The vapors are heavier than air and can cause suffocation by reducing oxygen available for
breathing.
Eyes protection:
Safety glasses.
Protection of hands:
Rubber gloves.
Hygiene measures:
Do not smoke.
PHYSICAL AND CHEMICAL PROPERTIES
Color:
Colorless
Odor:
Light.
Boiling point:
-52.8°C at atmospheric pressure.
Lighting point:
It does not ignite.
Density:
1.08 kg/l at 25°C.
Solubility in water:
Negligible.
STABILITY AND REACTIVITY
Stability:
No reactivity when used with the appropriate instructions.
Materials to avoid:
Highly oxidizing materials. Incompatible with magnesium, zinc, sodium, potassium and
The incompatibility is more serious if the metal is present in powdered form or if the surfaces
were, recently, unprotected.
Decomposition products
These products are halogenated compounds, hydrogen fluoride, carbon oxides (CO, CO2),
Risks:
TOXICOLOGICAL INFORMATION
Acute toxicity:
(R32) LC50/ inhalation /4 hours/on rat >760 ml/l
(R125) LC50/ inhalation /4 hours/on rat >3480 mg/l
Local effects:
Concentrations substantially above the TLV may cause narcotic effects.
Inhalation of decomposed products of high concentrations may cause respiratory failure
(pulmonary edema).
Long term toxicity:
Did not show any carcinogenic potential, teratogenic or mutagenic effects in animal experiments.
ECOLOGICAL INFORMATION
Global Warming Potential
2088
GWP (R744=1):
Ozone Depletion Potential
0
ODP (R11=1):
Disposal considerations:
Usable with reconditioning.

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5TECHNICAL CHARACTERISTICS
The HPE water chillers and heat pumps series are designed for residential and industrial applications,these units are extremely
versatile and can operate in heat pump mode with the ability of hotwater production at a temperature up to 65°C for
environmental heating and sanitary applications with the utilization ofelectric heaters.
The use of brushless inverter compressor technology, matched with the electronic expansion valve and to the pump and the
variable speed blower are generally used for optimizing the power consumption and the operative efficiency of the refrigerating
components of the whole system.
5.1 FRAME
All i-HP units are made up of hot-galvanised thick sheet metal, painted with polyurethane powder enamels at 180°C to ensure the
best resistance against atmospheric agents. The front panel is hinged to the lift side to allow access to the internal components for
inspection and maintenance. The screws and the inserts are made up of galvanized steel.
5.2 REFRIGERANT CIRCUIT
The refrigerant circuit has been manufactured according to the UNI EN 13134 directive concerning welding procedures. The
refrigerant gas employed in these units is R410A type. The refrigerant circuit includes in its basic version: 4-way reversing cycle
valve, electronic expansion valve, liquid separator, liquid receiver, check and maintenance valves, pressure safety device according
to PED regulation (high pressure switch), and pressure transducers to accurately adjust the evaporating and condensing pressures,
filters for expansion valve to prevent its clogging. The versions with vapour injection also include heat exchanger to produce
vapour, electronic injector valve, and the ON-OFF valves of injection in case of two compressors.
5.3 COMPRESSORS
The compressors are scroll type DC inverter designed foruse with R410A refrigerant, and are mounted ona rubber material acting
as a shock absorber. The compressors of the injection versions are designed tooptimize the efficiency of the refrigerant cycle
under low ambient temperatures conditions and aresupplied with connection for vapour injection.
The crankcase heater operates when the compressor remains off for atleast 30minutes and if the discharge temperature is below
20°C (with hysteresis of 2.0°C). When the compressor restarts, the crankcase heater will stop operation. We recommend toturn
on the unit and toput itin standby mode atleast 6 hours before the first start-up.
The checking ofthe compressors is possible through the front panel ofthe unit that allows the maintenance ofthe compressors
even if the unit is in operation.
5.4 AIR-SIDE EXCHANGER
The air-side heat exchanger is made up of copper pipes and aluminium fins. The copper pipes diameter is 7,94 mm, the thickness
of the aluminium fins is 0,12 mm. The pipes are mechanically expanded into the aluminium fins in order to improve the heat
transfer coefficient. The geometry of this heat exchanger ensures a low value air-side pressure drop and then it allows the use of
fans with low number of revolutions (with the advantage of reducing the unit noise level).
5.5 FAN MOTOR
The fan motor is axial type with plastic aerofoil blades. It is statically and dynamically balanced and supplied with a safety fan
guard. The fan motor is a modulated brushless type, directly coupled and equipped with an integrated thermal overload
protection. The protection class of the motor is IPX4 according to CEI EN 60529.
5.6 USER-SIDE HEAT EXCHANGER
The user-side heat exchanger is made up of AISI 304 stainless steel braze-welded plates type, and is factory insulated with flexible
close cell material and is equipped with an antifreeze electric heater (optional accessory: KA). Each evaporator is equipped with a
temperature sensor for antifreeze protection that activates the circulator, even in the case where the unit is turned off when
meeting the setting parameters by controller.
5.7 ELECTRICAL CONTROL PANEL
The electrical control panel board is manufactured according to European Union directives currently in force. To access to the
electrical control panel board, put the disconnect switch in the Off position, (presence of a door lock system) and wait until fan
blades have come to a complete stop, open the front panel by removing the three screws with a flat-head screwdriver, turn to
open quarter-turn the two locks of the electric control panel board. The protection degree is IP34. The electric box is supplied with
a terminal block completed with free contacts for remote ON-OFF, and for winter/summer change over. The addition of the
optional module GI enables the management of further functions of the plant.
5.8 CONTROL SYSTEM
The HPE units are equipped with a microprocessor adopting an overheating control logic program through the electronic
thermostatic valve managed by the pressure transducers signals and temperature sensor. The CPU also manages the following
functions: water temperature regulation, antifreeze protection, compressors’ time setting, alarm reset, alarms management and
operation LED. Upon request, the microprocessor can be connected to a BMS remote control system and to the simpler HNS
system with our terminal units. The control system together with the INVERTER technology and the on board sensors can
continuously monitor and adapt the performance of the inverter compressor, of the circulator pump and of the fan motor.
5.9 CONTROL AND PROTECTION DEVICES
The units are standard equipped with the following control and protection devices: return water temperature sensor installed on
the return water pipe line from the plant, operating and antifreeze sensor installed on the outlet water pipe to the plant, high

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pressure transducer, low pressure transducer, compressor’s inlet and outlet temperature sensors, thermal protection device for
fan motors, water side water flow switch to protect the evaporator, high pressure HP flow switch.
5.10 HYDRAULIC CIRCUIT
The heap pump chillers of i-HP series are supplied with an integrated hydronic kit including: plate heat exchanger, a pressure
gauges at the inlet and outlet of the heat exchanger for evaluating the load losses, service valve and flow switch for protection,
automatic air release valve and safety valve (6 bar) to be connected to the collection system. The version with an integrated
modulating type circulator pump adopting a brushless motor with high efficiency (EEI≤0,23), suitable for the utilization of chilled
water and directly managed by the controller on board.
5.11 FAN SPEED CONTROL
This type of regulation, performed by the microprocessor, is necessary for optimizing the evaporation/condensation pressure
during summer/winter operation in order to allow the correct operation of the appliance.
5.12 ENHANCED VAPOUR INJECTION (EVI) TECNOLOGY
The heat pumps of HPE LT series are equipped with scroll compressors with vapor
injection (EVI technology) provide maximum efficiency regarding the standard units
with scroll compressors.
The EVI technology consists ofinjecting the refrigerant vapour atthe intermediate
stage of the compression process which cansignificantly increase the capacity and
the efficiency of the compressor.
Each scroll compressor installed inthe heat pumps of the series i-HP-LT is
comparable to a two-stage compressor but withanintermediate stage of cooling
the refrigerant.
The diagram shows the main stages of the refrigeration cycle of the unit with EVI
technology. The stage ofhigh pressure is consisting ofthe extraction of a part of
the liquid refrigerant coming out ofthe condenser and then expands through an
injection valve, in a heat exchanger which functions as a sub-cooler.
The generated superheated vapour is then injected into the E.V.I. compressor in
the middle ofthe compression cycle (through a special pipeinside the compressor
itself).
The additional sub-cooling of the liquid thus obtained could greatly increase the
capacity of the evaporator.
Ahigher ratio between the condensation and evaporation pressures will
significantly increase the performance ofthis system with respect toall the
traditional technologies ofgascompression.
This system allows the air/water heat pump of the series i-HP-LT to generate hot
water upto60°C and capable ofoperating in temperatures up to -25°C.

6AVAILABLE VERSIONS WITH SIZES AND ACCESSORIES
The code unit is composed of:
no. 7 fixed digits (the first two digits identify the i-HP series in its eventual customizations)
the # symbol as a separator
no. 11 variables digits (fields) which identify the sizes, versions and factory mounted accessories
no. 1 fixed digits equal to 0, for now it is not used
0110516#(CT1)(TA)(IV)(CI)(KA)(GI)(FAN)(SIL)(TR)00(MC)
FATHER CODE
SIZE
VERSION
0110516#
CT
TA
IV
Output capacity
Configuration of water piping Vapor injection
00 25 kW
01
35 kW
02
50 kW
03
60 kW
04
50F kW
05
70 kW
0
2 pipes
0
Without injection
1
With injection (*)
(*) It is not available for the capacities of 60, 50F and 70 kW.

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CODE FACTORY INSTALLED ACCESSORIES
0110516#(CT1)(TA)(IV) CI KA GI FAN SIL TR AC1
Hydronic configuration
Antifreeze Kit
Management module for
plant Type of fan Silencing Battery treatment
Accessory 1
0
Hydraulic pipe
1
Integrated circulator
(1)
2
Shutoff valve
3
Auto
-adaptive circulator(2)
6 AC inverter pump(3)
0
W
ithout antifreeze
kit
1 With antifreeze kit
0 GI Module not present
1 GI Module present*
2
Modbus communication
protocol
(4)
3
Modbus communication
protocol and GI module
present (*)
0 DC fan
0 Not silenced
1 Silenced
2 Super silenced
0 Coil without treatment
2 Coil with Finguard treatment
0None
1 Switch magnetothermic circuit
breaker
(1) Not available for 70 kW variant
(2) Not available for 60 and 70 kW variants
(3) Not available for 25, 35, 50 and 50F kW variants
(4) Not available for models with steam injection (IV = 1)
(*) The models with designation “LT” which refers to steam injection are always equipped with GI module.

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Filed
Variant
Description
CT
00, 01,
02, 03,
04, 05
Heating capacity of the unit.
TA
0 The version of 2 pipes provides only Plant Inlet and Outlet Water.
IV
0 Without vapor injection.
1
The vapor injection allows to increase the efficiency of the compressor especially in the critical conditions (air
temp. <7°C or >35°C).
CI
0
The configuration with external pump without management in parallel includes the installation of a piece of
pipe in the place of the circulator. N.B.: the external pump is not supplied.
1
The configuration with integrated circulator provides a modulating pump with brushless motor, suitable for the
use of chilled water and directly managed by the controller on-board unit.
2
The configuration with external pump with management in parallel requests the installation of an ON/OFF
motorized valve instead of the circulating pump, in order to exclude the unit if req
uested by the management of
multi-unit parallel. N.B.: the external pump is not supplied.
3 Configuration with high efficiency auto-adaptive integrated circulator
6 Configuration with high efficiency AC pump, driven by inverter
KA
0
Unit not equipped with anti-freeze kit.
1
The antifreeze kit uses a self-regulating heating cable wrapped around the basement of the unit near the
condensing coil and two in PET heaters placed on the faces of the plate heat exchanger.
GI
0 Unit not equipped with management module for plant
1
The additional module implements some useful functions for the plant management, such as sanitary hot water
SHW, double setpoint, management of the electric heaters of the plant, etc.
2
RS485 serial communication module for Modbus supervisor.
3
The unit provided with the additional module and also with the serial communication module.
FAN 0 Unit equipped with DC brushless modulating fan motor.
SIL
0 Unit not silenced.
1 The silenced unit (with SL accessory) provides thermo-acoustic insulators on compressors.
2
The super silenced unit (with SSL accessory) provides thermo-acoustic insulators on compressors and a special
diffuser installed on the fan which reduces the noise level.
TR 0 Coil without treatment.
2 Coil with anti-corrosion finguard treatment
AC1
0
No accessory
1 Presence of magneto-thermic switch
The CT field identifies the size of the unit. The name of each unit provides the heating capacity anticipated by the number of
compressors. For example the unit with CT1 = 00 (25 kW) is named as HP-0125.
The fields TA and IV identify the 2 versions actually available:
- 2-pipes without injection
- 2-pipes with injection (named LT)
The remaining fields (CI, KA, GI, FAN, SIL, TR, AC1) identify the accessories mounted at the factory, that should be requested at the
time of order.
The variant 0 of these fields identifies the standard configuration of each size and version.
Example: The code of the standard configuration (without accessories) of the model i-HP-LT 0235 is obtained as below:
0110516#(CT1)(TA)(IV)(CI)(KA)(GI)(FAN)(SIL)(TR)(AC1)001→0110516#(01)(0)(1)(0)(0)(0)(0)(0)(0)0001→0110516#01010000000001
N.B. The following sizes 60, 70, 50F kW are not available in LT version.
6.1 OPTIONAL ACCESSORIES
Hi-T
Multifunction touch screen remote control with centralized management of i-HP and HNS system, functions of USB port,
temperature and humidity sensors. It has also an extremely intuitive interface simplifying the use of the controller.
CRH
Remote control panel to be installed in the room for the unit remote controlling, with additional functions in comparison
to the one installed on board; it can also manage our hydronic terminal units.
N.B.: the functionality of the double setpoint are managed by mean of the Hi-T controller and not by CRH controller.
AG
Anti-vibration rubber pad to be installed in the chassis of the unit for possible shock absorption.
IMPORTANT NOTE
ONLY THE OPTIONAL ACCESSORIES CAN BE REQUIRED AFTER THE ORDER OF THE UNIT,
WHILE THE FACTORY INSTALLED ACCESSORIES CAN NOT BE REQUIRED AFTER THE ORDER OF THE UNIT.

13
Refer to the following table for obtaining the codes of the standard configurations of the various models (for selecting the
accessories, just set the corresponding variant to the desired value according to the TABLE FIELDS/VARIANTS described above):
Model
Description
Standard configuration
HPE 25
Capacity of 25 kW without injection
0110516#00000000000001
HPE 35
Capacity of 35 kW without injection
0110516#01000000000001
HPE 50
Capacity of 50 kW without injection
0110516#02000000000001
HPE 60
Capacity of 60 kW without injection
0110516#03000000000001
HPE 50F
Capacity of 50 kW, fixed and inverter compressors, without injection
0110516#04000000000001
HPE 70 Capacity of 70 kW, without injection 0110516#05000000000001
HPE-LT25Capacity of 25 kW, with injection 0110516#00010000000001
HPE-LT35Capacity of 35 kW, with injection 0110516#01010000000001
HPE-LT50Capacity of 50 kW, with injection 0110516#02010000000001
Name of factory-fitted accessories:
Field
Variant
Description
Name
CI
1
High efficiency integrated circulator
CI1
CI
2
Shut-off valve
CI2
CI
3
High efficiency auto-adaptive integrated circulator
CI3
CI
6
AC inverter pump
CI6
KA
1
Antifreeze kit
KA
GI
1
Management plant module
GI
SIL
1
Silencing
SL
SIL
2
Super silencing
SSL
TR
2
Heat exchanger treatment finguard with
TR2
AC1
1
Switch magnetermic
7INSTALLATION
WARNING: All the operation described in next chapters MUST BE DONE BY TRAINED PEOPLE ONLY. Before any
operation on the unit, be sure that the electric supply is disconnected.
7.1 GENERALITY
When installing or servicing the unit, it is necessary to strictly follow the rules listed in this manual, to conform to all the
specifications of the labels on the unit, and to take any possible precautions. Not observing the rules reported on this manual can
create dangerous situations.
After receiving the unit, immediately check its integrity. The unit left the factory in perfect condition; any eventual
damage has to be questioned to the carrier and recorded on the Delivery Note before signing it.
The company has to be informed, within 8 days, of the extent of the damage. The Customer should prepare a written statement of
any severe damage.
WARNING: The i-HP units are designed for outdoor installation and for places not directly accessible to unqualified
personnel. The place of installation must be entirely far away from fire risk. All the necessary measures should be
adopted in order to prevent the fire risk in the place of installation. The outdoor ambient temperature shall not
exceed 46°C. Above this value, the unit is no longer covered by the directives in force in the area of pressure
equipment.
WARNING: The unit should be installed so that adequate clearance is available for maintenance and repair. The
warranty does not cover costs related to platforms or handling equipment necessary for any maintenance.
All maintenance and testing operations should be carried out only by QUALIFIED PERSONNEL.
Before any operation on the unit, make sure the power supply is disconnected.
WARNING: MOVING PARTS, RISK OF DEATH.
Disconnect the power supply and ensure that the fan is stopped before opening the front panel.
The top part and discharge pipes of the compressor operate at high temperatures. Be sure to let the unit to become
cool before beginning any maintenance work.
Be careful to the surface of the driver boards’ heatsinks which could be too hot.
Be careful when working near condensing coils.
The aluminum fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels tightly with the fastening screws.
It recommended not to remove/tamper with the safety pressure switch and its connections in order not to endanger
its functionality as safety device. Burst risk.

14
7.2 LIFTING AND HANDLING
The handling must be performed by qualified personnel, properly equipped with appropriate equipment to the weight and the
encumbrance of the unit, in compliance with safety regulations of accident preventing.
When the unloading and the placement of the unit,
it is highly recommended to avoid any sudden or
violent motion
in order to protect the inner
components and the frame. The units can be lifted
by mean of a forklift or, otherwise by mean of belts,
making sure to damage the lateral panels and the
cover of the unit using a structure of spacers as
shown in the drawing. In this context, it is necessary
to hook indirectly the unit to the basement but on
two steel pipes of adequate dimension that to pass
into the appropriate hol
es situated in the same
basement of the unit. It is important to keep the
unit horizontal during these operations.
1) Handling with forklift
under the pallet
2) Handling with forklift
under the unit using the
appropriate windows of
passing forks
3) Handling by
mean of belts
7.3 LOCATION AND MINIMUM TECHNICAL CLEARANCES
All i-HP models are designed for outdoor installations; any cover over the unit or locating near trees (even if they partially cover
the unit) has to be avoided in order to allow the air recirculation. It is advisable to realize a supporting basement, with adequate
size similar to unit foot-print. The unit vibration level is very low: it is advisable however, to fit a rigid rubber band between
basement and unit base-frame. It is also possible to install anti-vibration supports (springs or rubbers) to keep vibrations at a very
low level. An absolute care has to be taken to ensure adequate air volume to the condenser. The re-circulation of discharge air has
to be avoided; failure to observe this point will result in poor performance or activation of safety controls. For these reasons it is
necessary to observe the following clearances:
MOD.
A
B
C
D
HPE 25 / HPE-LT25
1500
1000
1000
1000
i-HP35 / HPE-LT35
1500
1000
1000
1000
HPE 50F/i-HP0250/HPE-LT50
1500
1000
1000
1000
HPE 60 / HPE 70
1500
1000
1000
1000
* The recommended minimum distance for installation, maintenance and operation.
N.B. Avoid suspended installations. If you cannot, use your common sense and follow
local regulations, and in the case of doubt, contact your authorized service center.
Front panel

15
7.4 DIMENSIONS
IN/OUT: 2”F
Modes
Height H
[mm]
Height H with AXITOP
(Versions SSL) [mm]
Max Packing
height (*) [mm]
Max Packing height with
AXITOP (Versions SSL) [mm]
HPE 25 / HPE 35
HPE 25 LT /HPE 35 LT 1673 1906 1785 2030
i-HPE 50 / HPE 50F / HPE 0260 /HPE
70, HPE 50 LT 1745 1910 1890 2055
(*) Some units could be shipped with another type of packaging, only in case of units without AXITOP accessory. The maximum
height should be increased by 95mm.
7.5 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and local regulations; pipes can be made up of steel,
galvanized steel or PVC. Pipes have to be designed depending on the nominal water flow and on the hydraulic pressure drops of
the system. All the hydraulic connections must to be insulated with closed-cell material of adequate thickness. Chillers have to be
connected to piping by means of flexible joints. The hydraulic circuit should include the following components:
•Hole thermometers for monitoring the hydraulic circuit’s temperature.
•Manual gate valves to separate the chiller from the hydraulic circuit.
• Y-shaped metallic filter (to be mounted on the return pipe from the plant) with a metallic mesh not larger than 1mm.
•Loading group and discharge valve, where it’s necessary.
WARNING: Make sure that, when designing the pipe length and diameter do not exceed the maximum head loss on
the plant side, please see the technical data (available head pressure).
WARNING: An air vent valve should be always installed at the high point of the plant system.
WARNING: In the models of i-HP series, the expansion vessel is not integrated on the plant side. The actual capacity of
plant circuit should be checked by the installer in order to provide an expansion tank with adequate volume.
WARNING: Connect the pipes to the attacks by using always key against key system.
WARNING: Unit water inlet pipe have to be in correspondence with the connection labelled: ”WATER INLET”, otherwise
the evaporator may freeze.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter with a mesh not larger than 1mm.
Shoul
d the water flow switch be altered or should the filter not be installed, the warranty will no longer be valid. The
filter have to be kept clean, so make sure it is clean after the unit has been installed, and then check it periodically.
All units are standard supplied with the water flow switch (factory installed). Should the water flow switch be altered,
removed, or should the water filter not be installed on the unit, the warranty will be invalidated. Please refer to the
wiring diagram for the water flow switch electric connections.
The water on the charging/topping up pipe must be opportunely pre-filtered from any suspended particles and

16
impurities through the use cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you load and top up the plant circuit. With particularly hard water, in this case it
is necessary to utilize a water softener. For treating water for the plant, please refer to UNI 8065
and the
characteristics reported in the paragraph 7.2.1.
Both for new installations and in case of replacement of a previously installed machine, the system must be washed in
advance in order to prevent any residues from clogging the plate heat exchanger.
Following the damage of the plate heat exchanger for: tampering with the flow switch, continuous manual restarts
after alarm of the flow switch, lack of washing of the system or lack/tampering of the Y filter, the company reserves
the right not to pass the replacement of the component as a guarantee.
7.5.1 Characteristics of water of the plant circuit
To ensure the correct operation of the unit, the water should be adequately filtred (see what is reported at the beginning of this
paragraph) and that the amounts of dissolved substances should minimal. The maximum permitted values are given here below.
MAXIMUM PHYSICAL AND CHEMICAL CHARACTERISTICS ALLOWED BY THE WATER OF
THE PLANT CIRCUIT
PH
7,5 - 9
Electrical conductivity
100 - 500 μS/cm
Total hardness
4,5 – 8,5 dH
Temperature
˂ 65°C
Oxygen content
˂ 0,1 ppm
Maximum glycol content
50 %
Phosphates (PO4)
˂ 2ppm
Manganese (Mn)
< 0,05 ppm
Iron (Fe)
< 0,3 ppm
Alkalinity (HCO3)
70 – 300 ppm
Chloride ions (Cl-)
< 50 ppm
Sulfate ions (SO4)
< 50 ppm
Sulfide ions (S)
None
Ammonium ions (NH4)
None
Silica (SiO2)
< 30 ppm
7.5.2 Hydraulic circuit type

17
7.5.3 Handbook
For more information about some possible configurations, contact our offices and ask for the handbook, which collects a series of
recommended drawings of plants that have been highlighted regarding the installation configuration of our high efficiency heat
pumps. The "Handbook" shows also the symbiotic potential with some of our products present in the catalogue.
7.5.4 Hydraulic circuit
i-HP 0125 / i-HP-LT 0125
i-HP 0135 / i-HP-LT 0235
-HP 0250F / i-HP 0250 / i-HP-LT 0250
i-HP 0260 / i-HP 0270
A
Plate heat exchanger
B
Water flow switch
C
Service valve
D
Inlet pressure gauge
E
Outlet pressure gauge
F
Air vent valve
G
Safety valve
H
Circulating pump
7.5.5 Drainage connection
All i-HP units are adopt drain holes on the basement for the discharge of the condensate that may leach from the pipes of the
hydraulic and refrigerant circuits, and to discharge the water generated during defrosting cycles.
7.5.6 Plant circuit loading
WARNING: Verify all the charging/topping up operations.
WARNING: Before beginning the charging/topping up operation of the plant circuit, disconnect the unit from the
electric power supply.
WARNING: The charging/topping up of the plant circuit must always be done under controlled conditions of pressure
(max 1 bar). Make sure that you have installed on the line of charging/topping up a pressure reducer and a relief
valve.
WARNING: The water on the charging/topping up pipe must be suitably pre-filtered from any impurities and
suspended particles. Make sure that you have installed a cartridge filter removable.
WARNING: Before beginning the charging/topping up operation, unscrew the plugs of the air vent valve. Tighten the
plugs after finishing the operation of charging/topping up of the plant circuit system.
7.5.7 Plant drainage system
In the case when it is necessary to unload the plant, close at first the inlet and outlet manual gate valves (not supplied) and then
remove the pipes that are disposed externally on the water inlet and on the water outlet in order to spill away the liquid contained
in the unit (in order to make easy the operation, it is recommended to install externally two draining valves, on the water inlet and
on the water outlet, between the unit and the manual gate valves).
1
During the operations of charging/topping up, the plugs of the air vent
valves must be partially unscrewed to allow air to flow freely out of the
valves.
(1) Plug of the air vent valve
You can use the service valve, when it is necessary to refill the plant or
adapt the concentration of glycol. Unscrew the plug (cap) of the service
valve and connect to the hose a pipe of 14 mm (inner diameter)
connected to the water network, and then fill
the system by
unscrewing the knurled nut. When the operation is concluded,
retighten the knurled nut and screw on the plug. In any case, we
recommend you to use for the water loading of the plant an external
tap whose arrangement is by the installer.
Cap with gasket
Knurled nut

18
7.6 REFRIGERANT DIAGRAMS
7.6.1 Refrigerant diagram of HPE 25 and HPE 35 models
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
CP
CAPILLARY
SE
OUTDOOR AIR TEMPERATURE SENSOR
V
ON/OFF VALVE WITH SOLENOID
7.6.2 Refrigerant circuit of HPE 50 model
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
CP
CAPILLARY
V
ON/OFF VALVE WITH SOLENOID

19
7.6.3 Refrigerant diagram ofthe model HPE 0250, HPE 0260and HPE 0270
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
7.6.4 Refrigerant circuit of HPE 50F model
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
CP
CAPILLARY
CI
ON-OFF COMPRESSOR TYPE
V
ON/OFF VALVE WITH SOLENOID

20
7.6.5 Refrigerant circuit ofHPE LT 25 model
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
V
ON/OFF VALVE WITH SOLENOID
VBP
SUPERCOOLING BYPASS VALVE
CP
CAPILLARY
INJT
INJECTION TEMPERATURE
INJP
INJECTION PRESSURE TRANSDUCER
INJ
INJECTION VALVE
7.6.6 Refrigerant diagram of“HPE-LT35”and “HPE-LT50” models
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
V
ON/OFF VALVE WITH SOLENOID
VBP
SUPERCOOLING BYPASS VALVE
CP
CAPILLARY
INJT
INJECTION TEMPERATURE
INJP
INJECTION PRESSURE TRANSDUCER
INJ
INJECTION VALVE
7.7 ELECTRICAL CONNECTIONS
Check if the power supply circuit meets the unit’s electric nominal data (tension, phases, frequency) reported on the label
attached on the right-side panel of the unit. The wiring must be done in accordance to the wiring diagram attached to the unit and
in conformity with the national and international norms in force (attempting to provide a general magneto-thermic circuit breaker,
differential circuit breakers for each electric line, proper grounding for the plant, etc.). Power cables, electric protections and line
fuses have to be sized according to the specifications listed in the wiring diagram enclosed with the unit and in the electrical data
contained in the table of technical characteristics.
Because of the presence, inside the machine, of EMC filters for compliance with EMC limits (interference emission and
interference immunity), earth fault currents up to 250 mA of intensity can be detected.
For proper installation, electrically connect the unit with a dedicated line; if you use a residual current circuit breaker,
choose a four-pole one, with a trigger threshold of 300 mA and delayed triggering (super-resistant, characteristic K).
The machine must be installed in TN-S/TT power supply grounding systems.
The electrical installation must be carried out in accordance with norms in force.