Enerblue PURPLE Operating instructions

PURPLEPURPLE
Natural refrigerant gas
R290
USER and
MAINTENANCE MANUAL

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MAINTENANCE
MANUAL
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1Introduction ����������������������������������������������������������������������� 5
2Symbols���������������������������������������������������������������������������������� 6
3Field of application������������������������������������������������������� 6
3�1 Overview��������������������������������������������������������������������������� 6
4Inspection, unpacking, transport��������������������� 7
4�1 Inspection ���������������������������������������������������������������������� 7
4�2 Unpacking����������������������������������������������������������������������� 7
4�3 Lifting and transport ����������������������������������������������� 7
5Unintended use �������������������������������������������������������������� 9
6Safety measures ������������������������������������������������������������ 9
6�1 Definition of dangerous area ����������������������������� 9
6�2 Safety provisions ����������������������������������������������������� 10
6�3 Installation in areas with
explosive atmospheres ��������������������������������������� 11
6�4 Protective devices ��������������������������������������������������� 11
6�5 Device for detecting
leaks of refrigerant R290 ����������������������������������� 11
6�5 Lighting ������������������������������������������������������������������������ 11
6�6 Personnel qualifications - obligations ������� 11
6�7 Various warnings ����������������������������������������������������� 11
7Positioning and installation������������������������������ 12
7�1 Spaces for installation ������������������������������������������ 13
7�2 Anti-vibration mounts (optional) �������������������13
7�2�1 Rubber anti-vibration mounts ����������������������13
7�3 General recommendations ��������������������������������
for hydraulic connections �������������������������������� 14
7�3�1 Recommended hydraulic circuit �������������� 15
7�3�2 St 1p - st 1pm - st 1pv set-ups �������������������� 15
7�3�3 St 1ps - st 1pms - st 1pvs set-ups ������������� 16
7�4 Sound level ����������������������������������������������������������������� 16
8Hydraulic connection ���������������������������������������������� 17
8�1 Hydraulic connection to the exchanger �� 17
8�2 Minimum water content in the plant� ������� 17
8�3 Hydraulic connection to the recovery
condenser or sanitary hot water �������������������� 17
8�4 Instructions for mounting
the water flow meter �������������������������������������������� 18
8�5 Water flow rate to the exchangers �������������� 19
8�6 Composition of the water ��������������������������������� 20
8�7 Operation with water to the evaporator
at low temperature (chiller unit)�������������������� 20
8�8 Operation with water to the condenser
at low temperature (heat pump unit) ������� 21
8�9 Discharge of the safety valves ������������������������ 21
9Electric connections �������������������������������������������������� 21
9�1 Overview ����������������������������������������������������������������������� 21
9�2 Powering the resistances of the
compressor guard ���������������������������������������������������� 22
9�3 Potential free contacts ������������������������������������������ 23
9�4 Circulation pump electric connections �������23
9�5 Control of the fans speed (*) ����������������������������� 23
9�6 Microprocessor control������������������������������������������ 23
10 Start-up �������������������������������������������������������������������������������� 24
10�1 Preliminary verifications ��������������������������������������24
10�2 Verifications during operation������������������������ 24
10�3 Checking the refrigerant load ������������������������ 25
10�4 Alarms ��������������������������������������������������������������������������� 25
11 Calibrating the control components�������������25
12 Decommissioning ������������������������������������������������������� 26
12�1 Seasonal shutdown ���������������������������������������������� 26
12�2 Emergency stop ����������������������������������������������������� 26
13 Periodic maintenance and inspections������ 27
13�1 Warnings����������������������������������������������������������������������� 27
13�2 Overview ��������������������������������������������������������������������� 28
13�3 Protection of the environment ��������������������� 30
14 Disposal of the unit ���������������������������������������������������� 30
15 Refrigerant �������������������������������������������������������������������������31
15�1 R290 refrigerant safety data sheets ������������ 31
15�2 Important information regarding
the refrigerant used ���������������������������������������������� 36
CONTENTS

WARNING!
PAY VERY ATTENTION TO THE FOLLOWING INSTRUCTIONS
Enerblue declines every responsibility for eventual damages that
can directly or indirectly derive to persons or things in consequence
to the lacked observance the present instructions.
Any assembly/disassembly carried out by the USER that is not
contemplated in this manual or authorised by Enerblue, will be
considered as tampering, thereby jeopardising the safety functions
and invalidating the warranty and conformity of the unit.
The correct use of this Chiller depends on how you apply the instructions mentioned on this MANUAL�
You need to respect the following rules in order to keep the validity of the warranty:
>The tolerance for the power supply voltage must not be different than +/- 5% of the nominal power
supply voltage specified on the unit label; the phases imbalance must be lower than 2%;
>The water filter is mandatory;
>It is mandatory to respect the clearances specified on the dimensional drawings;
>It is mandatory to respect the working limits of the units specified in the user manual;
>It is mandatory to make regular maintenance activities on the unit as specified in the user manual�
The unit must always be placed vertically, the same rule is valid for transport and installation.
During the transport, the units must be supported by their base module (please verify the labels of
instructions for the correct lifting points)�
The technical data, information and illustrations contained in this manual were believed to
be correct at the time of print. Enerblue reserve the right to change specifications and other
information contained in this manual as part of our continual improvement process.
No liability can be accepted for any inaccuracies or omissions in this manual.
IF THE MENTIONED ABOVE RULES WILL NOT BE RESPECTED,
THE WARRANTY VALIDITY WILL BE STOPPED.
The power supply voltage must be connected because it is a protection
for the inverter compressor, this needs to avoid bad working mainly
when the outside temperature is lower than 5°C.
The units with inverter compressor must always be connected to the
power supply voltage, please don’t disconnect the power supply, NEVER!
Please check the line of the electrical power supply voltage and all
conditions of the plant before each START-UP of the unit with inverter
compressor.
THESE UNIT MUST BE
INSTALLED OUTDOOR

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INTRODUCTION
For construction features, available models and technical data refer to the TECHNICAL BOOKLET�
The model, serial number, features, power supply voltage etc� are shown on the labels affixed to the
machine (the following images serve as an example)�
1
The Manufacturer has a policy for constant improvement and reserves
the right to make changes and improvements to the documentation of
the machines without prior notice.
The technical booklet and the labels affixed directly on the machine are
to be considered an integral part of this manual.

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SYMBOLS
Below is a description of the main symbols used in this manual and on the labels affixed on the unit�
2
FIELD OF APPLICATION
The “hydronic” version is intended for the cooling/heating of water generally for applications in the field
of airconditioning�
The“condensing”and“reversible condensing”versions of the machines are to be connected to ventilating
units with direct expansion coils for the cooling/heating of air; the coils and connecting pipes must be
designed for use with R290�
3
Danger symbol; risk of electric shock.
Danger symbol; moving mechanical parts.
Danger symbol; take extreme care.
WARNING
The refrigerant R290 (Propane) is flammable
and it must be handled only by competent and
responsible operators, under the conditions
specified in the safety regulations in force.
WARNING
The gas content into the unit is flammable. The
refrigerator should be stored OUTSIDE only.
Max. storage temp. = +50°C
WARNING
Keep the unit away from:
- Sunlight, rain, sand and wind
-Temperature:47°Cmaximum/minimum-20°C
- Maximum Humidity: 90%rH
Danger symbol; hazardous area.

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Failure to comply with the instructions in this manual and any modification to the unit without written
consent, will immediately render the warranty and conformity null and void�
Any intervention on the unit must be performed by qualified personnel.
Warning: before performing any intervention on the unit make sure
that the power supply has been disconnected. Refer to the section on
maintenance.
3.1 OVERVIEW
Upon installation or whenever interventions must be performed on the refrigeration unit, it is essential
to carefully follow the instructions in this manual, comply with the indications shown on board the unit
and apply all precautions required�
The pressures in the hydraulic circuit and the electrical components can create risky situations during
installation and maintenance interventions�
INSPECTION, UNPACKING, TRANSPORT
Below is a description of the main symbols used in this manual and on the labels affixed on the unit�
4.1 INSPECTION
Check the unit upon receipt, bearing in mind that it left the factory in perfect condition; report any signs of
damage immediately to the transporter and make a note of these on the Delivery Sheet before signing it�
The commercial office or manufacturer should be informed of the extent of the damage as soon as
possible� The Customer must fill in a written and photographic report concerning any relevant damage�
4.2 UNPACKING
Disposal of packing material is the responsibility of the receiver and must be carried out in compliance
with local and national regulations�
4.3 LIFTING AND TRANSPORT
During unloading and positioning of the unit, great care must be given to prevent sudden or violent
manoeuvres and not using machine components as strong points� Lift the unit using steel tubes inserted
in the relative lifting holes� The unit must be lifted by harnessing it as indicated in figure 1� Use cords or
belts that are long enough and spacer bars so as not to damage the sides and lid of the unit� Alternatively,
the units can be lifted using a fork-lift truck, inserting the forks in the supporting pallet (fig� 1)�
4
Attention: In all lifting operations, make sure that the unit is fastened
well in order to prevent accidental falls or over-turning.

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Fig. 1
The means of lifting, the ropes and harnesses must be selected by staff
with suitable specific knowledge and able to assume all responsibilities
relative to their use.
It is prohibited to pass under or near the load.
The unit must be transported by qualified personnel (forklift operator,
slinging personnel), who must wear the necessary personal protective
equipment (overalls, safety shoes, work gloves, hard hats, goggles).
The Manufacturer declines all responsibility for any accident caused by
non compliance with this warning.
Keep the forks low. Use ballasts in the event of unbalancing. Do not hold
protruding parts with your hands.

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UNINTENDED USE
The machine must not be used:
>in an inflammable and explosive atmosphere different from the self-generated;
>in extremely dusty environments;
>by untrained personnel;
>in non-compliance with the Standards in force;
>with improper installation;
>with power supply defects;
>with total or partial failure to comply with the instructions;
>with lack of maintenance and/or use of non-original spare parts;
>with modifications or other interventions not qualifield by the Manufacturer;
>when the work area is not kept free from tools and other objects;
>when the work area is not clean enough;
>in presence of abnormal vibrations in the work area;
>near heat sources;
>near to sources of steam;
>inside of facilities and / or buildings totally or partially closed;
>in installations with air recirculation�
The occurrence of one of these situations, causes the immediate
loss of warranty.
The occurrence of any of these situations may invalidate the
product’s conformity.
5
SAFETY MEASURES
The machine complies with Directives 2006/42 EC, 2014/30/UE (EMC), 2014/68/UE (PED) and 2014/34UE (ATEX)
and applicable Technical Standards as stipulated in the Declaration of Conformity that constitutes an integral
part of this manual�
6.1 DEFINITION OF DANGEROUS AREA
The machine must be accessed only by qualified operators�
> The internal dangerous area can be accessed by entering the machine� For no reason must access
inside the machine be allowed to unqualified personnel and before having disconnected the power
supply�
6

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6.2 SAFETY PROVISIONS
All the units are designed and built in compliance with the above mentioned directives, so as to ensure
maximum safety� Comply with the following provisions in order to prevent possible risks:
>this product contains pressurised parts, live components, moving mechanical components and sur-
faces at extreme temperatures that, in certain situations, can pose a risk: all maintenance must be
entrusted to qualified personnel with the necessary authorisation, in accordance with the regulations
in force� Before carrying out any operation, make sure that the appointed personnel has full knowledge
of the documentation supplied with the unit�
>Always have a copy of the documentation near the unit�
>The operations shown in this manual must be integrated with the procedures found in the user in-
struction manuals of the other systems and devices incorporated in the machine� The manuals contain
all the necessary information to handle the devices safely and the possible operating modes�
>Use the suitable protection (gloves, helmet, protective glasses, accident-prevention shoes etc�) for any
maintenance or control operation performed on the unit�
>Do not wear loose clothing, ties, chains, watches, etc�, which can get caught in moving machine parts�
>Always use tools and protective equipment in excellent state�
>There are very hot parts in the compressor compartment; be careful, therefore, when working in the
immediate vicinity not to touch any components of the unit without the necessary protection�
>Do not operate in the drain path of the safety valves�
>If the units are positioned in places that are not protected and can be easily reached by unqualified
persons it is mandatory to install suitable protections�
>The user is obliged to consult the installation and use manuals of the systems, incorporated and atta-
ched to this manual�
>There may be potential risks that are not evident� Warning and signs are therefore envisioned in the
machine�
>It is prohibited to remove the warnings�
It is forbidden to:
>remove or make safety guards ineffective;
>tamper with and/or modify, even partially, the safety devices installed on the machine
If an alarm is signalled and consequently the safety devices are activated, the operator must request the
immediate intervention of qualified maintenance technicians� Any accident can lead to serious injury or
death� The safety devices must be checked according to the guidelines found in the attached instruction
manuals� Verification and inspections must be performed by persons who are authorised in writing by
the employer� A copy of the verification results must be left on the machine or in its proximity� Any
accident can lead to serious injury or death� The manufacturer does not assume any liability for damage/
injury to persons, pets or objects deriving from the reuse of individual parts of the machine for functions
of assembly different to the original situation� It is prohibited to tamper with/replace one or more parts
of the machine without authorisation�
The use of accessories, tools or consumables other than those recommended by the Manufacturer
relieves the latter from civil or penal liability�
Machine decommissioning and demolition must be carried out by suitably trained and equipped
personnel�

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6.3 INSTALLATION IN AREAS WITH EXPLOSIVE ATMOSPHERES
The machine is covered by the scope of Directive 2014/34/EU: Directive 2014/34/EU on
equipment and protective systems intended for use in potentially explosive atmospheres
(ATEX).
The refrigerant used in the unit is gas propane (R290) and determines internally and in the
immediate vicinity of an area classified ZONE 2. The machine therefore report marking II 3G Ex
h IIA t1 Gc . In no case the machine can be installed within areas classified different from that
generated by itself.
6.4 PROTECTIVE DEVICES
The machine is equipped with technical protection measures against hazards that cannot be reasonably
eliminated or sufficiently limited through design�
It is forbidden to:
>remove or make safety guards ineffective
>tamper with and/or modify, even partly, the safety devices installed on the machine
>It is mandatory to convey the air of safety valves in a place where it will not cause damage to things,
people or animals
6.5 DEVICE FOR DETECTING LEAKS OF REFRIGERANT R290 GAS LEAK
DETECTOR
The refrigerant leak-detection device installed inside the unit disconnects the
power supply to compressors contactors if presence of R290 it is detected inside
the unit frame�
Setting = 5% of LEL (Low Explosion Limit)
6.6 LIGHTING
This should make it possible to carry out installation and maintenance without incurring risks due to
areas of darkness�
6.7 PERSONNEL QUALIFICATIONS  OBLIGATIONS
The user must know and apply the prescriptions regarding occupational safety, in compliance with
Directives 2006/42/EC and 1999/92/EC� Maintenance of electrical apparatus installed in compressor’s
box shall be berformed according to EN 60079-14 and EN 60079-17; maintenance operators should be
qualified according to EN 60079-14�
The knowledge and comprehension of the manual are indispensable for reducing risks and for improving
the health and safety of the workers� The operator must have a suitable degree of education to perform
the various activities throughout the technical lifespan of the machine�
The operator must be trained on possible anomalies, malfunctions or
dangerous conditions for himself or others and in any case, he must
comply with the following prescriptions:
- stop the machine immediately by acting on the emergency button/s;
- refrain from any intervention that goes beyond his duties and
technical knowledge;
- inform the employer immediately and do not take personal initiatives.
6.8 VARIOUS WARNINGS
Comply with the regulations in force concerning the safety devices on the machine and the personal
protective equipment�
The Technical File is maintained at the manufacturer’s location�
The manufacturer does not assume any liability for any damage/injury to persons, pets or objects
deriving from the failure to comply with the Safety Standards and recommendation contained in the
documentation supplied�
In addition to this manual are other documents and labels affixed directly on the machine that also
provide important information� Consult these other documents when required�

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POSITIONING AND INSTALLATION
The machine must only be installed outdoors. it is the user’s responsibility
to verify the need to provide protection with respect to atmospheric lightining
according to local legislation
The following must be taken into account when choosing the unit’s place of installation and making the
relative connections:
>ambient temperature: 47°C maximum / minimum -20°C
>maximum Humidity: 90%rH
>avoid, in any way other objects to overlay unit
>size and origin of the hydraulic piping;
>location of the power supply;
>accessibility for maintenance or repair operations;
>solidity of the support surface;
>ventilation of the air-cooled condenser;
>orientation and exposure to solar radiation: keep the condensing coil out of direct sunlight whenever
possible;
>do not position the unit in a way that strong winds favour air recirculation at the condensing coil;
>do not position the machine on dark coloured land (e�g� tarred surfaces) so as not to cause functioning
overheating;
>Verify that the installation is carried out only by qualified technical personnel and that they follow the
instructions in this manual and in compliance with the technical regulations;
>Install the unit in locations accessible only by authorized personnel and provide for protection against
intrusion into the danger zone;
>possible sound reverberation�
It is obligatory to observe the clearances specified in the dimensional drawing of the unit�
The unit must always be anchored to the ground�
Provide a solid base on which to position the unit� This support must be perfectly flat and horizontal� Its
dimensions must be suitable for those of the unit� This precaution is indispensable when the unit is to be
positioned on unstable ground (various lands, gardens etc�)�
Although the unit transmits low levels of vibrations to the supporting structure, it is advisable to lay a
sheet of hard rubber between the base of the unit and the supporting surface� If better insulation is
required, it is advisable to use the anti-vibration supports which are available as accessories�
In the event of installation on roofs or intermediate floors, the unit and the piping must be isolated from
the walls and ceilings� The units should not be positioned in proximity of private offices, bedrooms or
areas where low sound emissions are required� To prevent excessive sound reverberation, do not install
the unit in narrow or confined spaces�
The machine equipped with standard coils should not be installed in an environment where there is an
aggressive chemical atmosphere, in order to avoid the risk of corrosion�
Particular care should be taken to avoid atmospheres containing sodium chloride, which can aggravate
corrosion due to galvanic currents; a machine with untreated coils must not, for any reason, be installed
in a marine environment�
In the case of a marine or highly polluting industrial environment, it is necessary to request coils with
anti-corrosion surface treatment or copper-copper or copper-tinned copper coils�
In any case, please contact our commercial office to define the most suitable solution�
7

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7.1 SPACES FOR INSTALLATION
The service spaces to comply with are shown on the dimensional drawings attached to the documentation
of the machine�
The condensing coil must be allowed adequate space for the airflow at both the intake and the exhaust
side�
In order to prevent poor unit capacity or even interruptions in unit operation it is absolutely essential to
avoid the recirculation of air between the intake and the exhaust�
High walls near the unit may interfere with its proper functioning�
Units should be installed a minimum of three metres apart�
It is advisable to leave sufficient space between the units for removing their larger components such as
the exchangers, compressors or pumps�
7.2 ANTIVIBRATION MOUNTS OPTIONAL
In order to reduce vibrations transmitted to the structure, it is recommended to install the machine on
rubber or spring anti-vibration mounts, supplied as an accessory�
The dimensional layout with the contact patch, attached to the machine, shows the position and load of
each antivibration mount�
The anti-vibration mounts must be applied before positioning the machine on the ground�
7.2.1 RUBBER ANTIVIBRATION MOUNTS
The anti-vibration mount consists of an upper metal bell in which there is a screw to fasten the unit base�
The antivibration mount is fastened to the base through the two holes on the flange� The anti-vibration
flange bears a number (45,60,70 ShA) that identifies the hardness of the rubber support�
The dimensional layout with the contact patch, attached to the machine, shows the position and load of
each antivibration mount�
Fig. 3
Rubber/metal anti-vibration mounts, particularly suitable to dampen the vibration stress

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7.3 GENERAL RECOMMENDATIONS FOR HYDRAULIC CONNECTIONS
When setting up the hydraulic circuit for the evaporator, it is good practice to comply with the following
prescriptions and in any case with the national and local regulations (refer to the layouts included in the
manual)�
fit the piping to the chiller using flexible joints in order to prevent transmission of the vibrations and
compensate heat dilation� (Proceed on the pumps unit in the same way)�
Install the following components on the piping:
>stop cocks, temperature and pressure indicators for routing maintenance and unit inspection�
>sample points on the input and output pipes to read the temperature, if temperature indicators are
not present�
>shut-off valves (gate valves) to isolate the unit from the hydraulic circuit�
>metal mesh filter with openings not wider than 1 mm, on the exchanger inlet pipe to protect the
exchanger against slag or impurities in the pipes�
>vent valves, to locate in the highest parts of the hydraulic circuit, in order to allow to bleed the
noncondensables�
>expansion tank and automatic charging valve for maintenance of the system pressure and to compen-
sate heat dilation�
>drain valve and where necessary, drain tank to empty the system for maintenance operations or sea-
sonal breaks�
It is mandatory to comply with these prescriptions to facilitate the
hydraulic connection operations, maintenance and access to the
electrical panel.
It is highly recommended to install a safety valve on the hydraulic circuit.
If serious anomalies should arise in the system (e.g. a fire breaks out),
this allows the system to be drained, thereby preventing any explosion.
Always connect the drain to a pipe with a diameter that is no less than
that of the valve opening and direct it towards the areas where the jet
cannot harm anyone.
It is mandatory to install the flow meter supplied with the unit in line
with the chilled water outlet connection.
It is obligatory to assemble the metal mesh filter on the water inlet pipe.
If any of the above are missing, the warranty is cancelled immediately.
It is highly recommended to install a safety valve on the hydraulic
circuit. In the event of serious anomalies in the system (e.g. fire)
it allows to drain the system, thus preventing any explosions.
Always connect the drain to a pipe with a diameter that is no less than
that of the valve opening and direct it towards the areas where the jet
cannot harm anyone.

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7.3.1 RECOMMENDED HYDRAULIC CIRCUIT
7.3.2 ST 1P  ST 1PM SETUPS
Fig. 3
>01 Circulation pump
>02 Expansion tank
>03 Safety valve
>04 Non-return valve
>05 Ball cock
>03 03 Evaporator
>17 Electrical heater
>CR Heating cable
>EL Electric pump
>FL Flow meter
>RB Cock
>06 Tank
>07 Manometer
>08 Thermometer
>09 Water filter
>10 Bleed valve
>11 Flexible coupling
>12 Plant filling unit
>13 Water outlet
>14 Flow meter
>15 Plates exchanger
>PA Well for anti-freeze probe
>PF Well for water inlet probe
>03 Safety valve
>RE Tank electrical heater
>Storage tank capacity
>10 Bleed valve
>02 Expansion tank
Use two keys to tighten the hydraulic connections (see fig. 3).
Utility
water
outlet
Utility
water
inlet
Source side
exchanger

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7.3.3 ST 1PS  ST 1PMS SETUPS
7.4 SOUND
>03 Evaporator
>17 Electrical heater
>CR Heating cable
>EL Electric pump
>FL Flow meter
>RB Cock
>PA Well for anti-freeze probe
>PF Well for water inlet probe
>03 Safety valve
>RE Tank electrical heater
>Storage tank capacity
>10 Bleed valve
>02 Expansion tank
Unit size 12.1 15.1 20.1 22.1 25.1 30.1 32.1 34.1 35.1 40.1 45.1
Acoustic data LN version
Sound power level (1) dBA 72 73 73 74 74 82 82 82 82 84 84
Noise pressure level (10 m) (2) dBA 44 45 45 46 46 54 54 54 54 56 56
Acoustic data SLN version (3)
Sound power level (1) dBA 69 70 70 71 71 79 79 79 79 81 81
Noise pressure level (10 m) (2) dBA 41 42 42 43 43 51 51 51 51 53 53
Unit size 50.1 55.1 60.1 75.1 35.2 40.2 45.2 50.2 55.2 60.2 75.2 80.2
Acoustic data LN version
Sound power level (1) dBA 84 84 86 86 86 88 88 88 88 90 90 90
Noise pressure level (10 m) (2) dBA 56 56 58 58 58 60 60 60 60 62 62 62
Acoustic data SLN version (3)
Sound power level (1) dBA 81 81 83 83 83 85 85 85 85 - - -
Noise pressure level (10 m) (2) dBA 53 53 55 55 55 57 57 57 57 - - -
(1) Lw: sound power values in free field calculated in compliance with ISO 3744� Chiller working conditions (A35;W7)
(2) Sound pressure levels detected at 10/5/1 m from electrical panel, not channelled in free field, in compliance with ISO 3744� Chiller working conditions (A35;W7)
(3)SLN version have different dimension�

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HYDRAULIC CONNECTION
8.1 HYDRAULIC CONNECTION TO THE EXCHANGER
8
Warning: during the hydraulic connections, never operate with naked
flames near or inside the unit.
If the integrated inverter is not provided with the machine (i.e. is
supplied directly by the manufacturer), the hydraulic circuit should
be set up in such a way as to guarantee a constant flow of water to the
exchanger in all operating conditions. If this is not the case, the risk of
refrigerant returning in the liquid state to the compressor input would
be run, with the danger of breakage of the same.
It is of fundamental importance that the water inlet is installed where the
connection is marked with the following plate:
CHILLED WATER
Otherwise, the evaporator could freeze as the anti-freeze thermostat check
would be annulled.
8.2 MINIMUM WATER CONTENT IN THE PLANT
The compressors can run intermittently; this is because the amount of cooling power required by the
unit is not generally the same as that provided by the machine�
It is necessary to guarantee inertia on the system such to limit oscillation of the water temperature within
the limits that do not compromise the good functioning of the unit and, at the same time, guarantee
good stability at the water flow temperature towards the utility� The mathematical formula below is for
calculating the minimum water content on the side of the plant:
Vmin ≥ Ptot x (5 : 20)*
Vmin : water content of the plant [l]
Ptot : power capacity of the unit [kW]
Vmin If the above mentioned volumes are not reached, a storage tank must be set up for its capacity
together with that of the system to reach the relative value�
This tank does not require particular set-ups� It must however be carefully isolated like all chilled water
pipes, in order to prevent condensation and not to affect system performance�
8.3 HYDRAULIC CONNECTION TO THE RECOVERY CONDENSER
OR SANITARY HOT WATER
For all units with heat recovery, the connections of the hydraulic circuit related, consist of male threaded
pipes (depending on size)�
For units equipped with heat recovery is essential to follow the following instructions:
*5 litres = to safeguard the compressor
20 litres = for better efficiency of the system

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LAYOUT WITH 3WAY VALVES
Units with sanitary hot water or recovery exchanger are equipped
with a temperature probe. The probe must be connected to the unit
as shown in the electrical diagram. The sensor of the probe should be
installed in a relative well in the boiler. The well should be at the top of
the boiler or at the point where the water in use is at its hottest. In order
to ensure efficient operation, it is necessary to put conductive paste in
the well to make the probe work correctly. Failure to observe the above
requirements can result in malfunctioning or triggering of the unit’s
safety devices.
3-way valve
Recovery water output
Recovery water input
8.4 INSTRUCTIONS FOR MOUNTING THE WATER FLOW METER
>Clean the pipes making sure that any metal residue cannot interfere with correct operation of the flow
meter�
>Connect the flow meter to the male threaded outlet coupling on the evaporator (fig� 4) bearing this
label:
Seal the connection with Teflon tape�
WATER OUT
It is important that the water inlet of the recovery circuit is
installed where the connection is marked with the following plate:
It is mandatory to install a 3-way modulating valve with temperature
probe on the water entering the unit, which in normal working
conditions guarantees an input water temperature no less than 25 °C.
The safety devices can be triggered if the system that guarantees an
input water temperature no less than 25 °C.

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Fig. 4
Connect to the
terminal board
of the unit�
>Make sure that the flow meter (plastic body) is securely fastened on the metal coupling with the plastic
locking ring, and that the arrow on the flow meter points in the direction of the flow of water�
>Make sure to put the O-ring seal between the locking ring and the metal fitting� The O-ring is provided
in the plastic cover that protects the rod of the flow meter�
>Connect the hydraulic circuit to the other end of the “T” fitting�
>Feed the electrical cable of the flow meter through the hole in the structural steelwork and connect
the flow meter to the terminals in the electric control board as indicated in the electrical diagram�
>To disassemble the flow meter, unscrew the plastic locking ring� When reassembling the flow meter,
put the ring seal between the metal fitting and the plastic part�
8.5 WATER FLOW RATE TO THE EXCHANGERS
The nominal water flow rate refers to a thermal gradient of 5 °C between the inlet and outlet�
The maximum water flow rate refers to a thermal gradient of 4 °C: anything higher could cause too great
a pressure drop and the risk of damage to the evaporator�
The minimum allowed flow rate is that with a thermal difference of 5°C� Lower flow rate values could
cause excessively high condensing temperatures, leading to intervention of safety devices and unit
shutdown�
In any case, refer to the specific Technical Booklet for the permitted conditions for the flow of water in
and out of the exchangers�

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8.6 COMPOSITION OF THE WATER
Dissolved substances in the water can cause corrosion in the heat exchangers� It is mandatory to verify
that the water parameters comply with this table:
Total hardness 2�0 to 6�0 °F
Langelier index - 0�4 to + 0�4
pH 7�5 to 8�5
Electrical conductivity 10 to 500 QS/cm
Organic element -
Hydrogen carbonate (HCO3
-) 70 to 300 ppm
Sulphates (SO4
2- ) < 50 ppm
Hydrogen carbonate / Sulphates (HCO3
-/SO4 2-) > 1
Chlorides ( Cl-) < 50 ppm
Nitrates (NO3
-) < 50 ppm
Sulphuric acid (H2S) < 0�05 ppm
Ammonia (NH3) < 0�05 ppm
Sulphites (SO3), free chlorine (Cl2) < 1 ppm
Carbon dioxide (CO2) < 5 ppm
Metal cations < 0�2 ppm
Manganese ions ( Mn++) < 0�1 ppm
Iron ions ( Fe2+, Fe3+) < 0�2 ppm
Iron + Manganese < 0�5 ppm
Phosphates (PO43-) < 2 ppm
Oxygen < 0�1 ppm
If water is used that does not meet the criteria in the table, the warranty is immediately rendered null
and void�
It is mandatory to set up a system that eliminates the possible organic substances in the water that
could pass through the filter and settle in the heat exchangers, which would lead to malfunction and/
or damage in time�
If the water used in the unit contains organic substances, the warranty is immediately rendered null and
void�
8.7 OPERATION WITH WATER TO THE EVAPORATOR
AT LOW TEMPERATURE CHILLER UNIT
With temperatures below 5°C, it is good practice to operate with water and anti-freeze mixtures and alter
the relative safety devices (anti-freeze, etc�), which must be carried out by qualified authorised personnel
or by the manufacturer�
The glycol percentage in weight is determined depending on the desired temperature of the chilled
water (see Table 5)�
Minimum ambient temperature or liquid
outlet temperature (°C) 0 -5 -10 -15 -20 -25 -30 -35 -40
Freezing point (°C) -5 -10 -15 -20 -25 -30 -35 -40 -45
Anti-freeze % in weight
Ethylene glycol 6 22 30 36 41 46 50 53 56
Propylene glycol 15 25 33 39 44 48 51 54 57
Temp -20 T -20°C ---
Temp -40 T -40°C
Temp -60 T -60°C
Tifoxite 40 50 60 63 69 73 -
Freezium 10 20 25 30 34 37 40 43 45
Pekasol 50 50 50 59 68 75 81 86 90 -
Table 5 - Freezing point for water-anti-freeze mixture