MAXA HWA1-A Series Instruction Manual

AIR CONDITIONING
A55
USER'S-INSTALLER'S MANUAL
Serie/Series/Serie/Série Emissione/Edition/Au-
sgabeIssue
HWA1-A/H
10 – 2017
0140- 0285
Catalogo/Catalogue/Katalog/Brochure Sostituisce/Superseedes
Ersetzt/Remplace
AIR/WATER CHILLERS AND HEAT PUMPS WITH AXIAL FANS
MUI01110G7720-02 09 – 2017
R22
R407
c
R41
0a
R1
3
4
a
R407C

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
2
INDEX
1PURPOSES AND CONTENTS OF THE MANUAL ........................................................................................................................ 4
1.1 CONSERVATION OF THE MANUAL ......................................................................................................................................... 4
1.2 GRAPHIC SYMBOLS ................................................................................................................................................................ 4
2SAFETY LAWS......................................................................................................................................................................... 4
2.1 PERMITTED USES ................................................................................................................................................................... 4
3GENERAL SAFETY GUIDELINES ............................................................................................................................................... 5
3.1 WORKERS’ HEALTH AND SAFETY............................................................................................................................................ 5
3.2 PERSONAL SAFETY EQUIPMENTS ........................................................................................................................................... 5
3.3 SAFETY SYMBOLS ................................................................................................................................................................... 5
4REFRIGERANT SAFETY DATA SHEET........................................................................................................................................ 6
5TECHNICAL CHARACTERISTICS ............................................................................................................................................... 7
5.1 CARPENTRY ............................................................................................................................................................................ 7
5.2 REFRIGERANT CIRCUIT ........................................................................................................................................................... 7
5.3 COMPRESSORS....................................................................................................................................................................... 7
5.4 AIR-SIDE HEAT EXCHANGER ................................................................................................................................................... 7
5.5 FAN MOTOR ........................................................................................................................................................................... 7
5.6 USER-SIDE HEAT EXCHANGER ................................................................................................................................................ 7
5.7 ELECTRICAL PANEL ................................................................................................................................................................. 7
5.8 CONTROL SYSTEM.................................................................................................................................................................. 7
5.9 CONTROL AND PROTECTION DEVICES.................................................................................................................................... 8
5.10 HYDRAULIC CIRCUIT............................................................................................................................................................... 8
5.11 FAN SPEED CONTROL ............................................................................................................................................................. 8
6ACCESSORIES, SIZES AND VARIOUS AVAILABLE VERSIONS..................................................................................................... 9
6.1 OPTIONAL ACCESSORIES ...................................................................................................................................................... 10
7INSTALLATION ......................................................................................................................................................................11
7.1 GENERALITY ......................................................................................................................................................................... 11
7.2 LIFTING AND HANDLING ...................................................................................................................................................... 11
7.3 LOCATION AND MINIMUM TECHNICAL CLEARANCES.......................................................................................................... 11
7.4 HYDRAULIC CONNECTIONS.................................................................................................................................................. 12
7.5 HYDRAULIC CIRCUIT................................................................................................................................................................... 13
7.5.1 Drainage system........................................................................................................................................................... 13
7.5.2 Plant circuit loading ..................................................................................................................................................... 14
7.5.3 Plant drainage system.................................................................................................................................................. 14
7.6 REFRIGERANT CIRCUITS ....................................................................................................................................................... 14
7.6.1 Refrigerant circuit of HWA1-A 0140 –0147 units ........................................................................................................ 14
7.6.2 Refrigerant circuit of HWA1-A 0260 –0272 - 0285...................................................................................................... 15
7.6.3 Total heat recovery HWA1-A unit Refrigerant circuit................................................................................................... 15
7.6.4 Desuperheater HWA1-A unit Refrigerant circuit .......................................................................................................... 16
7.6.5 Refrigerant circuit of HWA1-H 0140 –0147 units ........................................................................................................ 16
7.6.6 Refrigerant circuit of HWA1-H 0260 –0285 units ........................................................................................................ 17
7.6.7 Total heat recovery HWA1-H unit refrigerant circuit in cooling only ........................................................................... 17
7.6.8 Desuperheater HWA1-H unit refrigerant circuit .......................................................................................................... 18
7.7 WIRING ................................................................................................................................................................................ 18
7.7.1 Wiring terminal block................................................................................................................................................... 19
7.8 PM MODULE PHASES PROTECTION...................................................................................................................................... 19
7.1 PLANT MANAGEMENT OPTIONAL MODUL “GI” TERMINAL BLOCK...................................................................................... 19
8START UP..............................................................................................................................................................................20
8.1 POWER-ON/OF THE UNIT..................................................................................................................................................... 20
9INDICATIONS FOR THE USER.................................................................................................................................................20
10 SHUTDOWNS FOR LONG PERIODS ....................................................................................................................................21
11 PERIODICAL CONTROLS AND MAINTENANCE....................................................................................................................21
11.1 ENVIRONMENTAL PROTECTION........................................................................................................................................... 21

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
3
12 DISPOSAL PROCEDURE ..................................................................................................................................................... 22
13 TECHNICAL DATA.............................................................................................................................................................. 22
13.1 COOLING ONLY VERSION “HWA1-A”.................................................................................................................................... 22
13.2 HEAT PUMP VERSION “HWA1-H”......................................................................................................................................... 23
13.3 COOLING PERFORMANCE DATA TABLES FOR COOLING ONLY UNITS AT DIFFERENT WATER AND AIR TEMPERATURES ...... 24
13.4 COOLING PERFORMANCE DATA TABLES FOR HEAT PUMP UNITS AT DIFFERENT WATER AND AIR TEMPERATURES ........... 24
13.5 HEATING PERFORMANCE DATA TABLES AT DIFFERENT WATER AND AIR TEMPERATURE VALUES, OUTPUT CAPACITY AT
VARIOUS TEMPERATURES WITHOUT CONSIDERATION OF DEFROSTING CYCLES ............................................................................ 25
13.6 DECLARED TOTAL OUTPUT CAPACITIES AND POWER INPUT CURVES IN COOLING MODE................................................... 25
13.7 DECLARED TOTAL OUTPUT CAPACITIES AND POWER INPUT CURVES IN COOLING MODE FOR HEAT PUMP VERSIONS....... 27
13.8 DECLARED TOTAL OUTPUT CAPACITIES AND POWER INPUT CURVES IN HEATING MODE TAKING INTO ACCOUNT OF THE
DEFROSTING CYCLES ACCORDING TO EUROVENT STANDARD OF AVERAGE CLIMATE CONDITIONS................................................ 28
14 ELECTRIC DATA OF THE UNIT AND AUXILIARY ELEMENTS................................................................................................. 30
15 HEAD LOSS CURVES OF THE HYDRONIC CIRCUIT............................................................................................................... 30
16 HEAT PUMPS AVAILABLE HEAD PRESSURE WITH INTEGRATED PUMP.............................................................................. 30
17 ACCESSORIES FOR NOISE LEVEL REDUCTION .................................................................................................................... 31
17.1 SL.......................................................................................................................................................................................... 31
17.2 SSL ........................................................................................................................................................................................ 31
18 OPERATING LIMITS........................................................................................................................................................... 31
18.1 EVAPORATOR WATER FLOW RATE ....................................................................................................................................... 31
18.2 CHILLED WATER PRODUCTION (SUMMER OPERATION) ...................................................................................................... 32
18.3 HOT WATER PRODUCTION (WINTER OPERATION)............................................................................................................... 32
18.4 AMBIENT TEMPERATURE OPERATING LIMITS AND RECAPITULATIVE TABLE ....................................................................... 32
18.5 OPERATION BOUNDARIES.................................................................................................................................................... 33
19 CORRECTION FACTORS FOR USE OF GLYCOL .................................................................................................................... 34
20 CONTROL LOGICS ............................................................................................................................................................. 34
21 HANDBOOK FOR SOME CONFIGURATIONS OF INSTALLATION.......................................................................................... 34
22 DIMENSIONS .................................................................................................................................................................... 35

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
4
The manual of HWA1-A/HWA1-H units describes all the necessary information concerning the better use of the appliance under
the operator’s safety conditions which meets the requirements listed in the 2006/42/CE Equipment Directive and following
amendments.
Note: The pictures in this manual are for explanation purpose only. They may be slightly different from the unit you purchased.
The actual shape shall prevail.
1PURPOSES AND CONTENTS OF THE MANUAL
This manual provides the basic information concerning the selection, installation, operation and maintenance of the HWA1-
A/HWA1-H units. It is addressed to the installer and the user of the 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 in terms of potentiality, ergonomics, safety and functionality.
The company introduces also technological improvements and is not constrained to update the manuals for previous versions of
appliances that could not be compatible. 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 OF THE MANUAL
The manual has to be always kept by the user for future reference. It has to be stored in a safe place, away from dusts and
moisture. It has to be available and accessible to all users who shall consult it any time they are in doubt on how to operate the
equipment.
The company reserves the right to modify its products and related manuals without necessarily updating previous versions of the
reference material. It declines also any responsibility for possible inaccuracies in the manual if due to printing or transcription
errors.
The customer shall store any updated copy of the manual or parts of it delivered by the manufacturer as an attachment to this
manual.
The company is available to give any detailed information about this manual and to give information regarding the use and the
maintenance of its 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 which should be respected by the operator in order to guarantee the correct and
safe operation of the equipment.
2SAFETY LAWS
The HWA1-A/HWA1-H 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.
2.1 PERMITTED 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 described 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 specialist competent in the existing rules
in the country in which the appliance will be installed.

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
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3GENERAL SAFETY GUIDELINES
Before beginning to operate on HWA1-A/HWA1-H units every user has to be perfectly knowledgeable about the functions of the
equipment and its controls and has to have 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.
3.1 WORKERS’ HEALTH AND SAFETY
The workplace health and safety laws, including 89/391/CEE, 89/686/CEE, 2009/104/CE, 86/188/CEE 89/655/CEE, and
77/576/CEE should be respected by every employer who must oblige the employees 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.
3.2 PERSONAL SAFETY EQUIPMENTS
When operating and maintaining the HWA1-A/HWA1-H units, please use the following personal protective equipment.
Protective clothing: Service man or who operates on the plant systems should 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: Protection gloves should be used during maintenance or cleaning operations.
Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during
cleaning and maintenance operations.
3.3 SAFETY SYMBOLS
The safety signs indicated on the unit which should be respected:
General hazards.
Electric shock hazard.
Presence of moving organs.
Presence of surfaces that may cause injures.
Presence of hot surfaces that can cause burns.

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
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4REFRIGERANT 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:
Increasing 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 precautions:
Evaporate.
Cleaning method:
Evaporate.
HANDLING AND STORAGE
Manipulation
Action/technical precautions:
Provide sufficient air exchange and/or suction in work places.
Recommendations for safe use:
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 apparatus. The
vapors are heavier than air and can cause suffocation by reducing the available oxygen 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 aluminum.
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) and carbonyl halides.
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 carcinogenic, teratogenic or mutagenic effects in animal experiments.
ECOLOGICAL INFORMATION
Global warming potential
2088
GWP (R744=1):
Potential depletion
0
Ozone ODP (R744=1):
Disposal considerations:
Usable with reconditioning.

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
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5TECHNICAL CHARACTERISTICS
The HWA1/HWA1-H air-water chiller/heat pump units are designed for commercial and industrial applications, they are very
compact and still equipped with large-surface air side exchangers ensuring a high efficiency with the highest ratings of EER and
COP. The use of scroll compressors with high efficiency and particularly robust together with the patented system of oil recovery
and distribution used on tandem circuits ensure high reliability with consistent performances.
The units are all equipped with high and low pressure transducers, NTC sensors at the compressors’ inlet and a controller with
microprocessor with integrated driver for the management of an electronic expansion valve to further improve the
performances of the units for non-standard applications.
5.1 CARPENTRY
The HWA1-A/HWA1-H units are all 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: electronic expansion
valve, liquid separator, liquid receiver, check valves for maintenance and control, safety device according to PED regulation (high
pressure switch), relief valve for the refrigerant, pressure transducers to accurately measure the evaporating and condensing
pressures, high capacity drier unclogging drier filter for lamination valve and remove any moisture inside the circuit, the liquid
indicator for controlling the refrigerant charge. The “H” heat pump versions are equipped with 4 way valve for refrigerant cycle
inversion and an outdoor air temperature measurement sensor.
5.3 COMPRESSORS
The compressors are scroll type, especially designed for operation with R410A refrigerant, and are mounted on a rubber material
acting as a shock absorber. The crankcase heater operates when the compressor is off and stops when the compressor restarts
operation.
We recommend to turn ON the unit and to put it in standby mode at least 6 hours before the start-up.
The inspection of the compressors is possible through the front panel of the unit which allows also the monitoring of the inner
components.
5.4 AIR-SIDE HEAT EXCHANGER
The air-side heat exchanger for chiller units is made entirely of aluminium with the new microchannel technology which allows to
reduce significantly both the losses on the air side and the refrigerant charge; with this technology, the heat transfer across the
front surfaces is more equally effective compared to conventional heat exchangers. The heat pump models equipped with finned
heat exchangers with optimized fin pitch for operation at low temperatures.
5.5 FAN MOTOR
The fan motor is axial type with plastic aerofoil blades. It is statically and dynamically balanced and supplied with safety fan guard
and inlet and outlet airflow of double flared profile specially shaped to increase the efficiency and to reduce the noise level. The
fan motor is AC type designed to operate at one or two speeds with star/delta (Y-Δ) connection regulated in pressure, or is a speed
modulation brushless EC motor directly coupled and equipped with an integrated overheat protection device. 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 316 stainless steel braze-welded plates type, and is factory insulated with flexible
close cell material, as for the heat pump models, the heat exchanger could be equipped with an antifreeze electric heater
(optional KA accessory only for heat pump models). 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 PANEL
The electrical panel is manufactured according to European Union directives currently in force. To reach the electrical panel, put
the disconnecting switch in off position, (presence of a door lock system) and open the front plate of the electrical panel after
removing the fixing screws. The protection degree is IP34. The electrical panel is supplied with a terminal block with free contacts
for the remote control ON-OFF switch.
5.8 CONTROL SYSTEM
The HWA1-A and HWA1-H units are all equipped with a central system adopting a microprocessor with overheat control logic
managed by the signals sent by the pressure transducers and temperature sensors. The CPU also manages the following functions:
water temperature regulation, antifreeze protection, compressors’ time setting and start-up, management of fan motor and
circulating pump (if present), alarms reset, alarms notifications and operation LED. Upon request, the microprocessor can be
connected to a BMS remote control system.

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
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The addition of an expansion module allows to manage by mean of the controller beyond to an external modulating or two
positions 3-way valve, both the free cooling regulation and the circulators of the desuperheater and of the total heat recovery,
and the eventual double pumps with alternating optimized use of them according to the number of unit’s working hours.
5.9 CONTROL AND PROTECTION DEVICES
The units are standard equipped with the following control and protection devices: 3-phase monitor allows to stop the unit if the
phase sequence is incorrect or if the voltage of at least one phase is different with 15% from the others, return water temperature
sensor with antifreeze function which is installed on the return water pipe line from the plant circuit, operation sensor installed on
the water return pipe from plant circuit, low pressure transducer, high pressure transducer, compressors discharge temperature,
relief valve on low pressure side which opens at temperatures higher than 68°C, compressor inlet temperature sensor, suctions
compressors suction temperature sensors, air outside temperature sensor (HWA1-H), thermal protection switch for fan motors,
thermal protection on each compressor, water side flow switch to protect the evaporator, high pressure HP flow switch with
manual reset installed on the outlet pipe of the compressors near the high pressure intake of service. The below components are
supplied also as standard:
The integral protection module which is installed inside the compressors’ electrical box which detects by means of an
included sensor the real winding temperature and stops the compressor’s operation when the limit temperature is
reached and is a required protection also for the operation with low evaporation pressures especially when the thermal
protection on the power supply circuit is not sure.
High pressure transducer for condensation control, defrost cycle termination and shutdown of compressors in sequence
according to the maximum permitted pressure (allows to produce hot water at 50°C even with outside temperatures
above 40°C in bi-compressor heat pump units).
5.10 HYDRAULIC CIRCUIT
The HWA1-A/HWA1-H series can be supplied with an incorporated hydronic kit which includes: in addition to the flow switch, and
the other components already mentioned, pressure gauges at the inlet and pressure intake at the outlet of the heat exchanger to
assess the load losses, one or two circulating pump with AC motor which are suitable for the utilization of chilled water and
directly managed by the controller on-board unit in both on-off and modulation operations depending on the adopted solution.
It is also possible to install an internal inertial tank with external closed-cell foam insulation material and with capacity of about
180 liters.
The 3 way flow switching valve is also supplied in the free cooling versions joined together with the 3 row aluminum fins-copper
piping heat exchanges.
5.11 FAN SPEED CONTROL
One-speed fan motors with high pressure transducer as standard, available also for chillers of two-speed fan motors of star/delta
(Y-Δ) connection. This type of regulation controlled by the microprocessor is necessary for optimizing the condensation pressure in
cooling operation mode in order to allow the correct operation of the unit with a wide outdoor temperatures range. The
modulating control inverter with EC brushless motor can be supplied as optional particularly for heat pump units or when the
chilling operation mode is required at outdoor air temperatures below -5°C, this feature is supplied as standard on both cooling
only and heat pump models HWA1-A 0285 and HWA1-H 0285.

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
9
6ACCESSORIES, SIZES AND VARIOUS AVAILABLE VERSIONS
The code of the unit is composed of:
no. 7 fixed digits (the first two digits are for HWA1-A and HWA1-H series in its eventual customizations)
the “#”symbol is as a separator
no. 16 variables digits (fields) which are for identifying the sizes, versions and the factory mounted accessories.
no. 3 fixed digits fixed to be 0 which are not used at the moment.
010117#(RV)(PT)(TA)(CI) (KS)(KA)(GI)(FAN)(SIL)(TR)000
RV#
PT
TA
CI
KS
KA
GI
FAN
SIL
TR
REFRIG ROOFTOP
MOTOCONDENSING
Output capacity
Water piping
configuration
Hydronic
configuration
Integrated tank kit
Antifreeze Kit
Plant system management
module
Fan motor type
Silencing
Coil treatment
00
Cooling only
01
40 kW
09
/Reversible
heat pump
03
47 kW
05
60 kW
06
72 kW
07
85 kW
0
2 pipes
2
4 pipes total
recovery
3
Desuperheater
circuit
4
/FC Free-Cooling
0
No parallel
ext. pump
7
Integrated
AC pump
8
Integrated
Double AC
pump
0
Without
1
With integrated tank of 180L
0
Without antifreeze kit
1
With antifreeze kit
2
Antifreeze kit +
Crankcase heater carter
3
Crankcase heater carter
0
GI Module not present
1
GI Module present
2
Modbus
3
Modbus + GI
0
EC inverter
1
AC with inverter
2
AC fan motor (Δ/Y)
0
Without
1
Silenced
2
Super silenced
0
Coil without treatment
2
Coil with ‘Fin Guard’ treatment

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
10
FIELDS/VARIANTS TABLE
Filed
Variant
Description
RV
0
Cooling only versions for cooling operation
9
Heat pump versions for heating and cooling operations
PT
1
Model 140
3
Model 147
5
Model 260
6
Model 273
7
Model 285
TA
0
The version of 2 pipes provides only plant circuit water Inlet and water outlet.
2
Version of 4 pipes with total condensation heat recovery in cooling mode, supplied also with GI module with high pressure transducer and EC
circulator for condensation pressure control and defrost termination control.
3
The version with desuperheater is equipped with a heat exchanger on hot gas for heat recovery (DHW production), GI module with high
pressure transducer and EC circulator for condensation pressure control and defrost termination control.
4
Versions with coils and free-cooling valve for cooling only versions.
CI
0
Provided with only the connection pipes to the heat exchanger with flow switch, safety, air vent and discharge valves and inlet manometer.
7
The configuration with integrated on/off pump requires adding an AC pump, suitable for the use of chilled water and directly managed by
the unit on-board controller.
8
The configuration includes 2 integrated AC pumps with alternate operation to get optimized wear of the two pumps with the addition of a
pumps management module and eventual 3-way valve with DHW temperature sensor.
KS
0
Without storage tank
1
With integrated technical storage tank of 165 liters.
KA
0
Unit without anti-freeze kit, standard for cooling only units.
1
The anti-freeze kit employs a self-regulating heating cable wrapped around the basement of the unit near the condenser and two in PET
electric heaters placed on the faces of the plate heat exchanger (available only for heat pump models).
2
Similar to the previous configuration with crankcase heater, for cold-only versions (they are standard on heat pump models)
3
Crankcase heaters, for cooling only versions (are standard in heat pump versions)
GI
0
Unit without plant management module.
1
The additional module implements some important functions for the plant system management, such as domestic hot water DHW, double
setpoint, management of plant electric heaters, double compressor management in sanitary mode for high temperature of air etc.
2
Enablement of Modbus registers for remote interfacing.
3
Similar to the variant Gi=1, with in addition the enablement of Modbus registers for remote interfacing.
FAN
0
Unit provided with AC fan motor on off 1 speed, condensation regulation and defrost termination pressure.
1
Unit equipped with EC fan motor with speed modulating regulation for condensation control and defrost termination pressure.
2
2-speeds AC fan motor (for chilled water cooling only versions) with condensation pressure control.
SIL
0
Standard unit
1
Silenced unit (with SL accessory) provided with thermo-acoustic insulator on the compressors.
2
Super silenced unit (with SSL accessory) provided with a thermo-acoustic insulator on compressors and with the factory mounted AxiTop
device for noise reduction up to 3 dB (A), the EC modulating fan motor is also supplied for cooling operation up to -15°C.
TR
0
Coil with copper pipes and aluminium fins especially for heat pump utilization.
1
Finned-tube condenser with anticorrosion treatment.
2
Microchannel condenser, available only for the versions without reverse cycle.
The cooling only versions 0271 and 0285 and in the heat pump versions 0285 are provided with EC FAN motor.
By default the Gi2 are configured in the versions with TA2, TA3, TA4 and CI2.
6.1 OPTIONAL ACCESSORIES
AG
Anti-vibration rubber pad to be installed in the chassis of the unit for possible shock absorption.
GR
Protective grill for aluminum copper plate coils.
Hi-T
Remote control panel.
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.

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
11
7INSTALLATION
WARNING: The minimum temperature allowed for storing the unit is 5°C.
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 should be informed, within 8 days, of the extent of the damage. The Customer should prepare a written statement
of any severe damage.
WARNING: The HWA1-A/HWA1-H 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 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.
7.2 LIFTING AND HANDLING
The handling must be performed by qualified personnel, properly equipped with appropriate tools to the weight and the
encumbrance of the unit, in compliance with safety regulations of accident preventing.
During 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 holes 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
The HWA1-A and HWA1-H models are all designed for outdoor installations; any covering over the unit or locating near trees
(even if they partially cover the unit) should 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:

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
12
MODELS
A
B
C
D
HWA1-A / HWA1-H 0140
800
800
200
600
HWA1-A / HWA1-H 0147
800
800
200
600
HWA1-A / HWA1-H 0260
800
800
800
600
HWA1-A / HWA1-H 0272
800
800
800
600
HWA1-A / HWA1-H 0285
800
800
800
600
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.
7.4 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and/or local regulations; the pipes can be made up of
steel, galvanized steel or PVC. The pipes have to be accurately sized as a function on the nominal water flow of the unit and on the
hydraulic pressure drops of the hydraulic circuit. All the hydraulic connections must be insulated with closed-cell material with a
proper thickness. The chiller should be connected to piping using flexible joints. It’s recommended to install in the hydraulic circuit
the following components:
Hole thermometers for the hydraulic circuit’s temperature control.
Manual gate valves to intercept the unit from the hydraulic circuit.
Y-shaped metallic filter (mounted on the return pipe from the plant circuit) with a metallic mesh not less than 20 openings.
Expansion vessel with adequate capacity to the total water content of the plant.
Anti-vibration joints of adequate diameter to piping in order to prevent vibration transfer to the plant.
Manometer to read the pressure of water in the outlet and then determining the next water flow.
Loading group and discharge valve, where it’s required.
WARNING: Make sure that, when determining the pipe sizes you should exceed the maximum head loss on the plant
side, please refer to the technical data given in the table of Paragraph 13 (see available head pressure).
WARNING: In the models of HWA1-A/HWA1-H series, the integrated expansion vessel is not included on the plant
side. The real capacity of the plant circuit should be verified by the installer for providing an expansion tank with
adequate volume.
WARNING: The return pipe from the plant circuit should be in correspondence with the label: ”WATER INLET”,
otherwise the evaporator may freeze.
WARNING: It is required to install a metallic filter with mesh not larger than 1mm on the return pipe from the plant
circuit with label “WATER INLET”. The warranty will no longer be valid if the water flow switch is altered or changed
or if the metallic filter is not installed. The filter should be kept clean, so make sure that is clean after the installation
of unit, and then check it periodically.
All the units are standard supplied with water a factory-mounted flow switch. Should the water flow switch be
altered, removed, or should the water filter not be installed on the unit, the warranty will no longer be valid. 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
impurities through the use a cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you charge and top up the plant circuit. For particularly hard water, it is
necessary to utilize a water softener. For water treatment of the plant circuit, please refer to UNI 8065.
Front panel

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
13
7.5 Hydraulic circuit
Note: the free cooling is expected only for HWA1 units with EC fan motor.
Models: HWA1-A/HWA1-H without pump
A
Plate heat exchanger
B
Flow switch
C
Service valve
D
Manometer for inlet pressure
E
Air vent valve
F
Safety valve
Models: HWA1-A/HWA1-H with 1 or 2 pumps
A
Plate heat exchanger
B
Flow switch
C
Service valve
D
Manometer for inlet pressure
E
Air vent valve
F
Safety valve
G
AC centrifugal pump
H
Europa non return valve
Models: HWA1-A/HWA1-H with 1 or 2 pumps and inertial storage
A
Plate heat exchanger
B
Flow switch
C
Service valve
D
Manometer for inlet pressure
E
Air vent valve
F
Safety valve
G
AC centrifugal pump
H
Europa non return valve
I
Inertial storage
Models: HWA1-A / HWA1-H with 1 or 2 pumps for storage tank and free cooling
A
Plate heat exchanger
B
Flow switch
C
Service valve
D
Manometer for inlet pressure
E
Air vent valve
F
Safety valve
G
AC centrifugal pump
H
Europa non return valve
I
Inertial storage
L
Free cooling coil
N
3 way motorized valve
At the highest point of the plant circuit it is necessary to install an automatic air vent valve.
Provide an auxiliary expansion tank (not supplied) in order to control the volume changes in the plant side.
7.5.1 Drainage system
The HWA1-A/HWA1-H units all of them adopt drainage holes on the basement for the condensate draining which can leach from
the pipes of hydraulic and refrigerant circuits, and to discharge the generated water during defrosting cycles.
FOR THE HEAT PUMP UNITS, ESPECIALLY IN VERY COLD CLIMATE REGIONS, IT’S RECOMMENDED TO INSTALL ELEVATION
SUPPORTS IN ORDER TO ALLOW ICE FORMATION UNDER THE UNIT WITHOUT DAMAGING IT BY FREEZING.

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
14
7.5.2 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.
7.5.3 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).
7.6 REFRIGERANT CIRCUITS
7.6.1 Refrigerant circuit of HWA1-A 0140 –0147 units
C
Compressor
DT
Compressor outlet temperature
EV
Expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature sensor
ST
Compressor inlet temp.
SV
Solenoide valve
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

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
15
7.6.2 Refrigerant circuit of HWA1-A 0260 –0272 - 0285
C
Compressor
DT
Compressor outlet temperature
EV
Expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
SV
Solenoide valve
7.6.3 Total heat recovery HWA1-A unit Refrigerant circuit
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
NO
Normally open solenoid valve
NC
Solenoid valve normally closed
SS
DHW inlet temp. Sensor

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
16
7.6.4 Desuperheater HWA1-A unit Refrigerant circuit
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
CL
Tandem collector
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
SD
Desuperheated gas sensor
SS
DHW inlet temp. sensor
7.6.5 Refrigerant circuit of HWA1-H 0140 –0147 units
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
CL
Tandem collector
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
4WV
4 way valve

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
17
7.6.6 Refrigerant circuit of HWA1-A/H 0260 - 0272 - 0285 units
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
CL
Tandem collector
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
4WV
4 way valve
7.6.7 Total heat recovery HWA1-H unit refrigerant circuit in cooling only
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
4WV
4 way valve
NO
Solenoid valve normally open
NC
Solenoid valve normally closed
SS
Domestic hot water temp. Sensor

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
18
7.6.8 Desuperheater HWA1-H unit refrigerant circuit
C
Compressor
DT
Compressor outlet temperature
EV
Electronic expansion valve
FD
Unidirectional filter drier
SG
Liquid indicator
HP
High pressure transducer
IN
Water inlet temperature sensor
LP
Low pressure transducer
LR
Liquid receiver
LS
Liquid separator
M
Axial fan motor
OUT
Water outlet temperature sensor
Pr
High pressure flow switch
PV
Pressure intake
SE
Outdoor air temperature
ST
Compressor inlet temperature
CL
Tandem collector
SV
N.C. Solenoid valve
FM
Mechanical filter
NR
Non return valve
4WV
4 way valve
SS
Domestic hot water temp. Sensor
SD
Gas outlet temperature sensor
7.7 WIRING
Check if the power supply circuit meets the unit’s electric nominal data (voltage, phases and frequency) reported on the label
sticked 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 (see Paragraph 13).
Because of the presence of EMC filters for compliance with EMC limits (interference emission and interference
immunity) inside the machine, 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 TT or TN-S power supply grounding systems.
The electrical installation must be carried out in accordance with norms in force.
WARNING: The supply voltage’s fluctuations cannot exceed ±10% of the nominal value. Should this tolerance not be
respected, please contact our technical department.
WARNING: The power supply have to respect the listed limits: failing this, warranty will terminate immediately.
Before any operation on the unit, be sure that the power supply is disconnected.
WARNING: The water flow switch (B component in the previous hydraulic circuit and factory installed) has ALWAYS to
be connected following the indications listed in the wiring diagram. Never bridge the water flow switch connections in
the terminal board. Should the water flow switch connections altered or not properly made, the guarantee will be
invalidated.
Install upstream of each unit an adequate protection and disconnection device of the electric power with delayed
characteristic curve, with at least 3 mm contact opening and with an adequate capacity of breaking and differential
protection.
A good grounding is required; the manufacturer is not responsible for damage caused in case of lack of good
grounding.
Use cables that meet the regulations in force in different countries.
WARNING: The remote control panel is connected to the water chiller by means of no.4 wires having a 1,5mm2
section. The power supply cables have to be separated from the remote control wires. The maximum length is 50m.
WARNING: The remote control panel cannot be installed in areas with strong vibrations, corrosive gases, and excess
of dirtiness or high humidity levels. Please let free the area near the cooling openings.

HWA1-A & HWA1-H Chillers and Air/Water heat pumps with axial fans
19
7.7.1 Wiring terminal block
Electrical wiring has to be done only by qualified personnel.
If the lightning risk is high, the unit must be protected, the risk assessment must comply with the CEI EN 62305-2
regulation.
If there is a possibility that a lightning can strike the area around the appliance, shut down the unit and disconnect
the system upstream switch.
Make sure to ground the unit.
Do not ground the unit with pipes or lightning rods
A poor grounding of the unit can result in electrocution.
It is required that the electrical connections comply with the regulations in force in the country of installation.
Warning: Electrostatic discharges can damage the electronic components, before performing any work; ground the
electrostatic charge by touching objects such as water or heating pipes.
The electrical connections have to be realized by qualified personnel.
The power supply of the units is 3-Ph/N/PE 400V, 50Hz. The power cables should be brought inside the electrical panel of the unit
and connected to the disconnecting switch inside the electric panel itself, in the bottom at the left, as shown in the following figure:
PE
PE
193
4
5
2
7
8
PE
PE
2
5
4
3
6
1
8
7
I ON
O
OFF
PE L1 L2 L3 N
PE
The connections of the power supply cables to the disconnecting switch should be done starting from left to right as follows: L1 for
phase conductor 1, L2 for phase conductor 2, L3 for phase conductor 3, N for neutral line, PE earth conductor.
(*) Available for “HWA1-A” cooling only versions.
7.8 PM MODULE PHASES PROTECTION
The PM module detects the correct sequence of the 3-phases (L1, L2, and L3) power supply. The 3-phases power supply must be
connected with the correct sequence of the phases so as to ensure the right direction of rotation at the compressor start-up and
during operation. When the PM module acts for lack of phase, the controller will receive a signal to disconnect it from the power
supply.
7.1 PLANT MANAGEMENT OPTIONAL MODUL “GI” TERMINAL BLOCK
Where the plant management kit (optional) is present, a second controller is located inside the electric panel, which acts as I/O
ports expansion module. With this controller, it is possible to increase the number of logics that can be managed by the main
controller; for the configuration of the functionalities, please check the control manual supplied with the unit.
TERMINAL
TYPE
CONNECTION
12Va
Power supply 12 Vac
Power supply for remote control panel (keyboard)
12Vb
Power supply 12 Vac
Power supply for remote control panel (keyboard)
DI2
DI2 digital input
Remote on/off input (closed = unit is ON / open= unit is OFF)
GNDR
Serial communication
Modbus ground reference terminal connection for remote supervision
R+
Serial communication
Modbus + signal terminal connection for supervision
R-
Serial communication
Modbus - signal terminal connection for supervision
*DO5
Under voltage output 230V ac, 50Hz, 5A
resistive, 1A inductive. Should be connected to
the relay coil in order to get a free contact.
Undervoltage output for alarm warning
N-3
Neutral for single-phase power supply
L3-3
Phase voltage 230Vac
PEA
Ground reference

HWA1-A & HWA1-H Air/Water chillers and heat pumps with axial fans
20
TERMINAL
TYPE
CONNECTION
ST4E
NTC sensor -10kΏat 25°C β3435
Plant water remote sensor
ST7E
NTC sensor -10kΏat 25°C β3435
Domestic water sensor
ID1E
Voltage free contact digital input
Double setpoint
ID2E
Voltage free contact digital input
Thermostat
ID2E
Voltage free contact digital input
Change operating mode
DO5E(phase)
DO5E N(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Double set-point valve
DO6E(phase)
DO6EN(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Signalization
DO7E(phase)
DO7E N(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Signalization
8START UP
Before start-up:
Check out the availability of the supplied wiring diagrams and manuals of the installed appliance.
Check out the availability of the electrical and hydraulic diagrams of the plant in which the unit is installed.
Check that the shut-off valves of the hydraulic circuits are open.
Verify that the hydraulic circuit has been charged under pressure and air vented.
Check out that all hydraulic connections are properly installed and all indications on unit labels are respected.
Check if all power cables are properly connected and all terminals are tightly fixed.
Check if the electrical connections are performed according to the norms in force including the grounding connection.
Check if the voltage is that shown in the unit labels.
Make sure the voltage is within the limits (±5%) of tolerance range.
Check if the electric heaters of the compressors are powered correctly.
Make sure that there is no refrigerant leak.
Be sure that all the cover panels are installed in their proper positions and locked with fastening screws before start up.
If the first start-up of the machine does not turn the display on of the controller, you must reverse the phase sequence of the
power supply cable.
WARNING: The unit must be connected to the electrical network and should be in STAND-BY mode (powered) closing
the general switch in order to operate the crankcase heaters of the compressor for a minimum of 12 hours before
start up. (The electric heaters are automatically powered when the main switch is switched off). The crankcase
heaters are working properly if, after some minutes, the temperature of crankcase’s compressor is about 10°C ÷ 15°C
higher than ambient temperature.
WARNING: Never switch off the unit (for a temporary stop) by switching off the main switch: this component should
be used to disconnect the unit from the power supply only for lengthy stoppages (e.g. seasonal stoppages). Besides,
failing the power supply, the crankcase’s heaters are not supplied thus resulting in a possible breakdown of the
compressors once the unit is switched on.
WARNING: Do not modify the internal wiring of the unit otherwise the warranty will terminate immediately.
WARNING: The summer/winter operating mode has to be selected at the beginning of the related season. Frequent
and sudden changes of these seasonal operating modes have to be avoided in order to prevent severe damages to
compressors.
WARNING: When you first install and start-up the unit make sure that the unit is working properly in both cooling
and heating modes.
8.1 POWER-ON/OF THE UNIT
For powering ON the appliance, rotate the outer handle of the disconnector to the ON position (indicated with "I").
The display on the machine is turned on only if the phase sequence is correct (verification to be done during initial startup).
Between a shutdown and subsequent power on, wait a minimum time of 1 minute.
9INDICATIONS FOR THE USER
It’s important to take note of the identification data of the unit in order to provide them to the Technical Assistance Service in case
of assistance request.
The identification plate fixed on the unit shows the technical specifications and the performance of the equipment.
In case of manumission, removal or deterioration, please ask a duplicate to the Technical Assistance Service.
The manumission, removal or damaging of the nameplate makes difficult any operation of installation, maintenance
and spare parts request.
It is recommended to keep track of assistance operations that are executed on the unit; this will make easy searching any
troubleshooting.
In case breakdown or malfunction situations:
check the type of alarm to communicate it to the service center;
contact an authorized service center;
if required by the service center, turn off the unit immediately without resetting the alarm;
Ask the use of original spare parts.